blob: b84ff94e3e7cff4e12978495860dd3e6a32949bf [file] [log] [blame]
Changes between 1.0.1q and 1.0.1r [28 Jan 2016]
*) Protection for DH small subgroup attacks
As a precautionary measure the SSL_OP_SINGLE_DH_USE option has been
switched on by default and cannot be disabled. This could have some
performance impact.
[Matt Caswell]
*) SSLv2 doesn't block disabled ciphers
A malicious client can negotiate SSLv2 ciphers that have been disabled on
the server and complete SSLv2 handshakes even if all SSLv2 ciphers have
been disabled, provided that the SSLv2 protocol was not also disabled via
This issue was reported to OpenSSL on 26th December 2015 by Nimrod Aviram
and Sebastian Schinzel.
[Viktor Dukhovni]
*) Reject DH handshakes with parameters shorter than 1024 bits.
[Kurt Roeckx]
Changes between 1.0.1p and 1.0.1q [3 Dec 2015]
*) Certificate verify crash with missing PSS parameter
The signature verification routines will crash with a NULL pointer
dereference if presented with an ASN.1 signature using the RSA PSS
algorithm and absent mask generation function parameter. Since these
routines are used to verify certificate signature algorithms this can be
used to crash any certificate verification operation and exploited in a
DoS attack. Any application which performs certificate verification is
vulnerable including OpenSSL clients and servers which enable client
This issue was reported to OpenSSL by Loïc Jonas Etienne (Qnective AG).
[Stephen Henson]
*) X509_ATTRIBUTE memory leak
When presented with a malformed X509_ATTRIBUTE structure OpenSSL will leak
memory. This structure is used by the PKCS#7 and CMS routines so any
application which reads PKCS#7 or CMS data from untrusted sources is
affected. SSL/TLS is not affected.
This issue was reported to OpenSSL by Adam Langley (Google/BoringSSL) using
[Stephen Henson]
*) Rewrite EVP_DecodeUpdate (base64 decoding) to fix several bugs.
This changes the decoding behaviour for some invalid messages,
though the change is mostly in the more lenient direction, and
legacy behaviour is preserved as much as possible.
[Emilia Käsper]
*) In DSA_generate_parameters_ex, if the provided seed is too short,
return an error
[Rich Salz and Ismo Puustinen <>]
Changes between 1.0.1o and 1.0.1p [9 Jul 2015]
*) Alternate chains certificate forgery
During certificate verfification, OpenSSL will attempt to find an
alternative certificate chain if the first attempt to build such a chain
fails. An error in the implementation of this logic can mean that an
attacker could cause certain checks on untrusted certificates to be
bypassed, such as the CA flag, enabling them to use a valid leaf
certificate to act as a CA and "issue" an invalid certificate.
This issue was reported to OpenSSL by Adam Langley/David Benjamin
[Matt Caswell]
*) Race condition handling PSK identify hint
If PSK identity hints are received by a multi-threaded client then
the values are wrongly updated in the parent SSL_CTX structure. This can
result in a race condition potentially leading to a double free of the
identify hint data.
[Stephen Henson]
Changes between 1.0.1n and 1.0.1o [12 Jun 2015]
*) Fix HMAC ABI incompatibility. The previous version introduced an ABI
incompatibility in the handling of HMAC. The previous ABI has now been
Changes between 1.0.1m and 1.0.1n [11 Jun 2015]
*) Malformed ECParameters causes infinite loop
When processing an ECParameters structure OpenSSL enters an infinite loop
if the curve specified is over a specially malformed binary polynomial
This can be used to perform denial of service against any
system which processes public keys, certificate requests or
certificates. This includes TLS clients and TLS servers with
client authentication enabled.
This issue was reported to OpenSSL by Joseph Barr-Pixton.
[Andy Polyakov]
*) Exploitable out-of-bounds read in X509_cmp_time
X509_cmp_time does not properly check the length of the ASN1_TIME
string and can read a few bytes out of bounds. In addition,
X509_cmp_time accepts an arbitrary number of fractional seconds in the
time string.
An attacker can use this to craft malformed certificates and CRLs of
various sizes and potentially cause a segmentation fault, resulting in
a DoS on applications that verify certificates or CRLs. TLS clients
that verify CRLs are affected. TLS clients and servers with client
authentication enabled may be affected if they use custom verification
This issue was reported to OpenSSL by Robert Swiecki (Google), and
independently by Hanno Böck.
[Emilia Käsper]
*) PKCS7 crash with missing EnvelopedContent
The PKCS#7 parsing code does not handle missing inner EncryptedContent
correctly. An attacker can craft malformed ASN.1-encoded PKCS#7 blobs
with missing content and trigger a NULL pointer dereference on parsing.
Applications that decrypt PKCS#7 data or otherwise parse PKCS#7
structures from untrusted sources are affected. OpenSSL clients and
servers are not affected.
This issue was reported to OpenSSL by Michal Zalewski (Google).
[Emilia Käsper]
*) CMS verify infinite loop with unknown hash function
When verifying a signedData message the CMS code can enter an infinite loop
if presented with an unknown hash function OID. This can be used to perform
denial of service against any system which verifies signedData messages using
the CMS code.
This issue was reported to OpenSSL by Johannes Bauer.
[Stephen Henson]
*) Race condition handling NewSessionTicket
If a NewSessionTicket is received by a multi-threaded client when attempting to
reuse a previous ticket then a race condition can occur potentially leading to
a double free of the ticket data.
[Matt Caswell]
*) Reject DH handshakes with parameters shorter than 768 bits.
[Kurt Roeckx and Emilia Kasper]
*) dhparam: generate 2048-bit parameters by default.
[Kurt Roeckx and Emilia Kasper]
Changes between 1.0.1l and 1.0.1m [19 Mar 2015]
*) Segmentation fault in ASN1_TYPE_cmp fix
The function ASN1_TYPE_cmp will crash with an invalid read if an attempt is
made to compare ASN.1 boolean types. Since ASN1_TYPE_cmp is used to check
certificate signature algorithm consistency this can be used to crash any
certificate verification operation and exploited in a DoS attack. Any
application which performs certificate verification is vulnerable including
OpenSSL clients and servers which enable client authentication.
[Stephen Henson]
*) ASN.1 structure reuse memory corruption fix
Reusing a structure in ASN.1 parsing may allow an attacker to cause
memory corruption via an invalid write. Such reuse is and has been
strongly discouraged and is believed to be rare.
Applications that parse structures containing CHOICE or ANY DEFINED BY
components may be affected. Certificate parsing (d2i_X509 and related
functions) are however not affected. OpenSSL clients and servers are
not affected.
[Stephen Henson]
*) PKCS7 NULL pointer dereferences fix
The PKCS#7 parsing code does not handle missing outer ContentInfo
correctly. An attacker can craft malformed ASN.1-encoded PKCS#7 blobs with
missing content and trigger a NULL pointer dereference on parsing.
Applications that verify PKCS#7 signatures, decrypt PKCS#7 data or
otherwise parse PKCS#7 structures from untrusted sources are
affected. OpenSSL clients and servers are not affected.
This issue was reported to OpenSSL by Michal Zalewski (Google).
[Emilia Käsper]
*) DoS via reachable assert in SSLv2 servers fix
A malicious client can trigger an OPENSSL_assert (i.e., an abort) in
servers that both support SSLv2 and enable export cipher suites by sending
a specially crafted SSLv2 CLIENT-MASTER-KEY message.
This issue was discovered by Sean Burford (Google) and Emilia Käsper
(OpenSSL development team).
[Emilia Käsper]
*) Use After Free following d2i_ECPrivatekey error fix
A malformed EC private key file consumed via the d2i_ECPrivateKey function
could cause a use after free condition. This, in turn, could cause a double
free in several private key parsing functions (such as d2i_PrivateKey
or EVP_PKCS82PKEY) and could lead to a DoS attack or memory corruption
for applications that receive EC private keys from untrusted
sources. This scenario is considered rare.
This issue was discovered by the BoringSSL project and fixed in their
commit 517073cd4b.
[Matt Caswell]
*) X509_to_X509_REQ NULL pointer deref fix
The function X509_to_X509_REQ will crash with a NULL pointer dereference if
the certificate key is invalid. This function is rarely used in practice.
This issue was discovered by Brian Carpenter.
[Stephen Henson]
*) Removed the export ciphers from the DEFAULT ciphers
[Kurt Roeckx]
Changes between 1.0.1k and 1.0.1l [15 Jan 2015]
*) Build fixes for the Windows and OpenVMS platforms
[Matt Caswell and Richard Levitte]
Changes between 1.0.1j and 1.0.1k [8 Jan 2015]
*) Fix DTLS segmentation fault in dtls1_get_record. A carefully crafted DTLS
message can cause a segmentation fault in OpenSSL due to a NULL pointer
dereference. This could lead to a Denial Of Service attack. Thanks to
Markus Stenberg of Cisco Systems, Inc. for reporting this issue.
[Steve Henson]
*) Fix DTLS memory leak in dtls1_buffer_record. A memory leak can occur in the
dtls1_buffer_record function under certain conditions. In particular this
could occur if an attacker sent repeated DTLS records with the same
sequence number but for the next epoch. The memory leak could be exploited
by an attacker in a Denial of Service attack through memory exhaustion.
Thanks to Chris Mueller for reporting this issue.
[Matt Caswell]
*) Fix issue where no-ssl3 configuration sets method to NULL. When openssl is
built with the no-ssl3 option and a SSL v3 ClientHello is received the ssl
method would be set to NULL which could later result in a NULL pointer
dereference. Thanks to Frank Schmirler for reporting this issue.
[Kurt Roeckx]
*) Abort handshake if server key exchange message is omitted for ephemeral
ECDH ciphersuites.
Thanks to Karthikeyan Bhargavan of the PROSECCO team at INRIA for
reporting this issue.
[Steve Henson]
*) Remove non-export ephemeral RSA code on client and server. This code
violated the TLS standard by allowing the use of temporary RSA keys in
non-export ciphersuites and could be used by a server to effectively
downgrade the RSA key length used to a value smaller than the server
certificate. Thanks for Karthikeyan Bhargavan of the PROSECCO team at
INRIA or reporting this issue.
[Steve Henson]
*) Fixed issue where DH client certificates are accepted without verification.
An OpenSSL server will accept a DH certificate for client authentication
without the certificate verify message. This effectively allows a client to
authenticate without the use of a private key. This only affects servers
which trust a client certificate authority which issues certificates
containing DH keys: these are extremely rare and hardly ever encountered.
Thanks for Karthikeyan Bhargavan of the PROSECCO team at INRIA or reporting
this issue.
[Steve Henson]
*) Ensure that the session ID context of an SSL is updated when its
SSL_CTX is updated via SSL_set_SSL_CTX.
The session ID context is typically set from the parent SSL_CTX,
and can vary with the CTX.
[Adam Langley]
*) Fix various certificate fingerprint issues.
By using non-DER or invalid encodings outside the signed portion of a
certificate the fingerprint can be changed without breaking the signature.
Although no details of the signed portion of the certificate can be changed
this can cause problems with some applications: e.g. those using the
certificate fingerprint for blacklists.
1. Reject signatures with non zero unused bits.
If the BIT STRING containing the signature has non zero unused bits reject
the signature. All current signature algorithms require zero unused bits.
2. Check certificate algorithm consistency.
Check the AlgorithmIdentifier inside TBS matches the one in the
certificate signature. NB: this will result in signature failure
errors for some broken certificates.
Thanks to Konrad Kraszewski from Google for reporting this issue.
3. Check DSA/ECDSA signatures use DER.
Reencode DSA/ECDSA signatures and compare with the original received
signature. Return an error if there is a mismatch.
This will reject various cases including garbage after signature
(thanks to Antti Karjalainen and Tuomo Untinen from the Codenomicon CROSS
program for discovering this case) and use of BER or invalid ASN.1 INTEGERs
(negative or with leading zeroes).
Further analysis was conducted and fixes were developed by Stephen Henson
of the OpenSSL core team.
[Steve Henson]
*) Correct Bignum squaring. Bignum squaring (BN_sqr) may produce incorrect
results on some platforms, including x86_64. This bug occurs at random
with a very low probability, and is not known to be exploitable in any
way, though its exact impact is difficult to determine. Thanks to Pieter
Wuille (Blockstream) who reported this issue and also suggested an initial
fix. Further analysis was conducted by the OpenSSL development team and
Adam Langley of Google. The final fix was developed by Andy Polyakov of
the OpenSSL core team.
[Andy Polyakov]
*) Do not resume sessions on the server if the negotiated protocol
version does not match the session's version. Resuming with a different
version, while not strictly forbidden by the RFC, is of questionable
sanity and breaks all known clients.
[David Benjamin, Emilia Käsper]
*) Tighten handling of the ChangeCipherSpec (CCS) message: reject
early CCS messages during renegotiation. (Note that because
renegotiation is encrypted, this early CCS was not exploitable.)
[Emilia Käsper]
*) Tighten client-side session ticket handling during renegotiation:
ensure that the client only accepts a session ticket if the server sends
the extension anew in the ServerHello. Previously, a TLS client would
reuse the old extension state and thus accept a session ticket if one was
announced in the initial ServerHello.
Similarly, ensure that the client requires a session ticket if one
was advertised in the ServerHello. Previously, a TLS client would
ignore a missing NewSessionTicket message.
[Emilia Käsper]
Changes between 1.0.1i and 1.0.1j [15 Oct 2014]
*) SRTP Memory Leak.
A flaw in the DTLS SRTP extension parsing code allows an attacker, who
sends a carefully crafted handshake message, to cause OpenSSL to fail
to free up to 64k of memory causing a memory leak. This could be
exploited in a Denial Of Service attack. This issue affects OpenSSL
1.0.1 server implementations for both SSL/TLS and DTLS regardless of
whether SRTP is used or configured. Implementations of OpenSSL that
have been compiled with OPENSSL_NO_SRTP defined are not affected.
The fix was developed by the OpenSSL team.
[OpenSSL team]
*) Session Ticket Memory Leak.
When an OpenSSL SSL/TLS/DTLS server receives a session ticket the
integrity of that ticket is first verified. In the event of a session
ticket integrity check failing, OpenSSL will fail to free memory
causing a memory leak. By sending a large number of invalid session
tickets an attacker could exploit this issue in a Denial Of Service
[Steve Henson]
*) Build option no-ssl3 is incomplete.
When OpenSSL is configured with "no-ssl3" as a build option, servers
could accept and complete a SSL 3.0 handshake, and clients could be
configured to send them.
[Akamai and the OpenSSL team]
*) Add support for TLS_FALLBACK_SCSV.
Client applications doing fallback retries should call
[Adam Langley, Bodo Moeller]
*) Add additional DigestInfo checks.
Reencode DigestInto in DER and check against the original when
verifying RSA signature: this will reject any improperly encoded
DigestInfo structures.
Note: this is a precautionary measure and no attacks are currently known.
[Steve Henson]
Changes between 1.0.1h and 1.0.1i [6 Aug 2014]
*) Fix SRP buffer overrun vulnerability. Invalid parameters passed to the
SRP code can be overrun an internal buffer. Add sanity check that
g, A, B < N to SRP code.
Thanks to Sean Devlin and Watson Ladd of Cryptography Services, NCC
Group for discovering this issue.
[Steve Henson]
*) A flaw in the OpenSSL SSL/TLS server code causes the server to negotiate
TLS 1.0 instead of higher protocol versions when the ClientHello message
is badly fragmented. This allows a man-in-the-middle attacker to force a
downgrade to TLS 1.0 even if both the server and the client support a
higher protocol version, by modifying the client's TLS records.
Thanks to David Benjamin and Adam Langley (Google) for discovering and
researching this issue.
[David Benjamin]
*) OpenSSL DTLS clients enabling anonymous (EC)DH ciphersuites are subject
to a denial of service attack. A malicious server can crash the client
with a null pointer dereference (read) by specifying an anonymous (EC)DH
ciphersuite and sending carefully crafted handshake messages.
Thanks to Felix Gröbert (Google) for discovering and researching this
[Emilia Käsper]
*) By sending carefully crafted DTLS packets an attacker could cause openssl
to leak memory. This can be exploited through a Denial of Service attack.
Thanks to Adam Langley for discovering and researching this issue.
[Adam Langley]
*) An attacker can force openssl to consume large amounts of memory whilst
processing DTLS handshake messages. This can be exploited through a
Denial of Service attack.
Thanks to Adam Langley for discovering and researching this issue.
[Adam Langley]
*) An attacker can force an error condition which causes openssl to crash
whilst processing DTLS packets due to memory being freed twice. This
can be exploited through a Denial of Service attack.
Thanks to Adam Langley and Wan-Teh Chang for discovering and researching
this issue.
[Adam Langley]
*) If a multithreaded client connects to a malicious server using a resumed
session and the server sends an ec point format extension it could write
up to 255 bytes to freed memory.
Thanks to Gabor Tyukasz (LogMeIn Inc) for discovering and researching this
[Gabor Tyukasz]
*) A malicious server can crash an OpenSSL client with a null pointer
dereference (read) by specifying an SRP ciphersuite even though it was not
properly negotiated with the client. This can be exploited through a
Denial of Service attack.
Thanks to Joonas Kuorilehto and Riku Hietamäki (Codenomicon) for
discovering and researching this issue.
[Steve Henson]
*) A flaw in OBJ_obj2txt may cause pretty printing functions such as
X509_name_oneline, X509_name_print_ex et al. to leak some information
from the stack. Applications may be affected if they echo pretty printing
output to the attacker.
Thanks to Ivan Fratric (Google) for discovering this issue.
[Emilia Käsper, and Steve Henson]
*) Fix ec_GFp_simple_points_make_affine (thus, EC_POINTs_mul etc.)
for corner cases. (Certain input points at infinity could lead to
bogus results, with non-infinity inputs mapped to infinity too.)
[Bodo Moeller]
Changes between 1.0.1g and 1.0.1h [5 Jun 2014]
*) Fix for SSL/TLS MITM flaw. An attacker using a carefully crafted
handshake can force the use of weak keying material in OpenSSL
SSL/TLS clients and servers.
Thanks to KIKUCHI Masashi (Lepidum Co. Ltd.) for discovering and
researching this issue. (CVE-2014-0224)
[KIKUCHI Masashi, Steve Henson]
*) Fix DTLS recursion flaw. By sending an invalid DTLS handshake to an
OpenSSL DTLS client the code can be made to recurse eventually crashing
in a DoS attack.
Thanks to Imre Rad (Search-Lab Ltd.) for discovering this issue.
[Imre Rad, Steve Henson]
*) Fix DTLS invalid fragment vulnerability. A buffer overrun attack can
be triggered by sending invalid DTLS fragments to an OpenSSL DTLS
client or server. This is potentially exploitable to run arbitrary
code on a vulnerable client or server.
Thanks to Jüri Aedla for reporting this issue. (CVE-2014-0195)
[Jüri Aedla, Steve Henson]
*) Fix bug in TLS code where clients enable anonymous ECDH ciphersuites
are subject to a denial of service attack.
Thanks to Felix Gröbert and Ivan Fratric at Google for discovering
this issue. (CVE-2014-3470)
[Felix Gröbert, Ivan Fratric, Steve Henson]
*) Harmonize version and its documentation. -f flag is used to display
compilation flags.
[mancha <>]
*) Fix eckey_priv_encode so it immediately returns an error upon a failure
in i2d_ECPrivateKey.
[mancha <>]
*) Fix some double frees. These are not thought to be exploitable.
[mancha <>]
Changes between 1.0.1f and 1.0.1g [7 Apr 2014]
*) A missing bounds check in the handling of the TLS heartbeat extension
can be used to reveal up to 64k of memory to a connected client or
Thanks for Neel Mehta of Google Security for discovering this bug and to
Adam Langley <> and Bodo Moeller <> for
preparing the fix (CVE-2014-0160)
[Adam Langley, Bodo Moeller]
*) Fix for the attack described in the paper "Recovering OpenSSL
ECDSA Nonces Using the FLUSH+RELOAD Cache Side-channel Attack"
by Yuval Yarom and Naomi Benger. Details can be obtained from:
Thanks to Yuval Yarom and Naomi Benger for discovering this
flaw and to Yuval Yarom for supplying a fix (CVE-2014-0076)
[Yuval Yarom and Naomi Benger]
*) TLS pad extension: draft-agl-tls-padding-03
Workaround for the "TLS hang bug" (see FAQ and PR#2771): if the
TLS client Hello record length value would otherwise be > 255 and
less that 512 pad with a dummy extension containing zeroes so it
is at least 512 bytes long.
[Adam Langley, Steve Henson]
Changes between 1.0.1e and 1.0.1f [6 Jan 2014]
*) Fix for TLS record tampering bug. A carefully crafted invalid
handshake could crash OpenSSL with a NULL pointer exception.
Thanks to Anton Johansson for reporting this issues.
*) Keep original DTLS digest and encryption contexts in retransmission
structures so we can use the previous session parameters if they need
to be resent. (CVE-2013-6450)
[Steve Henson]
*) Add option SSL_OP_SAFARI_ECDHE_ECDSA_BUG (part of SSL_OP_ALL) which
avoids preferring ECDHE-ECDSA ciphers when the client appears to be
Safari on OS X. Safari on OS X 10.8..10.8.3 advertises support for
several ECDHE-ECDSA ciphers, but fails to negotiate them. The bug
is fixed in OS X 10.8.4, but Apple have ruled out both hot fixing
10.8..10.8.3 and forcing users to upgrade to 10.8.4 or newer.
[Rob Stradling, Adam Langley]
Changes between 1.0.1d and 1.0.1e [11 Feb 2013]
*) Correct fix for CVE-2013-0169. The original didn't work on AES-NI
supporting platforms or when small records were transferred.
[Andy Polyakov, Steve Henson]
Changes between 1.0.1c and 1.0.1d [5 Feb 2013]
*) Make the decoding of SSLv3, TLS and DTLS CBC records constant time.
This addresses the flaw in CBC record processing discovered by
Nadhem Alfardan and Kenny Paterson. Details of this attack can be found
Thanks go to Nadhem Alfardan and Kenny Paterson of the Information
Security Group at Royal Holloway, University of London
( for discovering this flaw and Adam Langley and
Emilia Käsper for the initial patch.
[Emilia Käsper, Adam Langley, Ben Laurie, Andy Polyakov, Steve Henson]
*) Fix flaw in AESNI handling of TLS 1.2 and 1.1 records for CBC mode
ciphersuites which can be exploited in a denial of service attack.
Thanks go to and to Adam Langley <> for discovering
and detecting this bug and to Wolfgang Ettlinger
<> for independently discovering this issue.
[Adam Langley]
*) Return an error when checking OCSP signatures when key is NULL.
This fixes a DoS attack. (CVE-2013-0166)
[Steve Henson]
*) Make openssl verify return errors.
[Chris Palmer <> and Ben Laurie]
*) Call OCSP Stapling callback after ciphersuite has been chosen, so
the right response is stapled. Also change SSL_get_certificate()
so it returns the certificate actually sent.
[Rob Stradling <>]
*) Fix possible deadlock when decoding public keys.
[Steve Henson]
*) Don't use TLS 1.0 record version number in initial client hello
if renegotiating.
[Steve Henson]
Changes between 1.0.1b and 1.0.1c [10 May 2012]
*) Sanity check record length before skipping explicit IV in TLS
1.2, 1.1 and DTLS to fix DoS attack.
Thanks to Codenomicon for discovering this issue using Fuzz-o-Matic
fuzzing as a service testing platform.
[Steve Henson]
*) Initialise tkeylen properly when encrypting CMS messages.
Thanks to Solar Designer of Openwall for reporting this issue.
[Steve Henson]
*) In FIPS mode don't try to use composite ciphers as they are not
[Steve Henson]
Changes between 1.0.1a and 1.0.1b [26 Apr 2012]
*) OpenSSL 1.0.0 sets SSL_OP_ALL to 0x80000FFFL and OpenSSL 1.0.1 and
1.0.1a set SSL_OP_NO_TLSv1_1 to 0x00000400L which would unfortunately
mean any application compiled against OpenSSL 1.0.0 headers setting
SSL_OP_ALL would also set SSL_OP_NO_TLSv1_1, unintentionally disablng
TLS 1.1 also. Fix this by changing the value of SSL_OP_NO_TLSv1_1 to
0x10000000L Any application which was previously compiled against
OpenSSL 1.0.1 or 1.0.1a headers and which cares about SSL_OP_NO_TLSv1_1
will need to be recompiled as a result. Letting be results in
inability to disable specifically TLS 1.1 and in client context,
in unlike event, limit maximum offered version to TLS 1.0 [see below].
[Steve Henson]
*) In order to ensure interoperabilty SSL_OP_NO_protocolX does not
disable just protocol X, but all protocols above X *if* there are
protocols *below* X still enabled. In more practical terms it means
that if application wants to disable TLS1.0 in favor of TLS1.1 and
above, it's not sufficient to pass SSL_OP_NO_TLSv1, one has to pass
SSL_OP_NO_TLSv1|SSL_OP_NO_SSLv3|SSL_OP_NO_SSLv2. This applies to
client side.
[Andy Polyakov]
Changes between 1.0.1 and 1.0.1a [19 Apr 2012]
*) Check for potentially exploitable overflows in asn1_d2i_read_bio
BUF_mem_grow and BUF_mem_grow_clean. Refuse attempts to shrink buffer
in CRYPTO_realloc_clean.
Thanks to Tavis Ormandy, Google Security Team, for discovering this
issue and to Adam Langley <> for fixing it.
[Adam Langley (Google), Tavis Ormandy, Google Security Team]
*) Don't allow TLS 1.2 SHA-256 ciphersuites in TLS 1.0, 1.1 connections.
[Adam Langley]
*) Workarounds for some broken servers that "hang" if a client hello
record length exceeds 255 bytes.
1. Do not use record version number > TLS 1.0 in initial client
hello: some (but not all) hanging servers will now work.
2. If we set OPENSSL_MAX_TLS1_2_CIPHER_LENGTH this will truncate
the number of ciphers sent in the client hello. This should be
set to an even number, such as 50, for example by passing:
-DOPENSSL_MAX_TLS1_2_CIPHER_LENGTH=50 to config or Configure.
Most broken servers should now work.
3. If all else fails setting OPENSSL_NO_TLS1_2_CLIENT will disable
TLS 1.2 client support entirely.
[Steve Henson]
*) Fix SEGV in Vector Permutation AES module observed in OpenSSH.
[Andy Polyakov]
Changes between 1.0.0h and 1.0.1 [14 Mar 2012]
*) Add compatibility with old MDC2 signatures which use an ASN1 OCTET
STRING form instead of a DigestInfo.
[Steve Henson]
*) The format used for MDC2 RSA signatures is inconsistent between EVP
and the RSA_sign/RSA_verify functions. This was made more apparent when
OpenSSL used RSA_sign/RSA_verify for some RSA signatures in particular
those which went through EVP_PKEY_METHOD in 1.0.0 and later. Detect
the correct format in RSA_verify so both forms transparently work.
[Steve Henson]
*) Some servers which support TLS 1.0 can choke if we initially indicate
support for TLS 1.2 and later renegotiate using TLS 1.0 in the RSA
encrypted premaster secret. As a workaround use the maximum pemitted
client version in client hello, this should keep such servers happy
and still work with previous versions of OpenSSL.
[Steve Henson]
*) Add support for TLS/DTLS heartbeats.
[Robin Seggelmann <>]
*) Add support for SCTP.
[Robin Seggelmann <>]
*) Improved PRNG seeding for VOS.
[Paul Green <>]
*) Extensive assembler packs updates, most notably:
- x86[_64]: AES-NI, PCLMULQDQ, RDRAND support;
- x86[_64]: SSSE3 support (SHA1, vector-permutation AES);
- x86_64: bit-sliced AES implementation;
- ARM: NEON support, contemporary platforms optimizations;
- s390x: z196 support;
- *: GHASH and GF(2^m) multiplication implementations;
[Andy Polyakov]
*) Make TLS-SRP code conformant with RFC 5054 API cleanup
(removal of unnecessary code)
[Peter Sylvester <>]
*) Add TLS key material exporter from RFC 5705.
[Eric Rescorla]
*) Add DTLS-SRTP negotiation from RFC 5764.
[Eric Rescorla]
*) Add Next Protocol Negotiation, Can be
disabled with a no-npn flag to config or Configure. Code donated
by Google.
[Adam Langley <> and Ben Laurie]
*) Add optional 64-bit optimized implementations of elliptic curves NIST-P224,
NIST-P256, NIST-P521, with constant-time single point multiplication on
typical inputs. Compiler support for the nonstandard type __uint128_t is
required to use this (present in gcc 4.4 and later, for 64-bit builds).
Code made available under Apache License version 2.0.
Specify "enable-ec_nistp_64_gcc_128" on the Configure (or config) command
line to include this in your build of OpenSSL, and run "make depend" (or
"make update"). This enables the following EC_METHODs:
EC_GROUP_new_by_curve_name() will automatically use these (while
EC_GROUP_new_curve_GFp() currently prefers the more flexible
[Emilia Käsper, Adam Langley, Bodo Moeller (Google)]
*) Use type ossl_ssize_t instad of ssize_t which isn't available on
all platforms. Move ssize_t definition from e_os.h to the public
header file e_os2.h as it now appears in public header file cms.h
[Steve Henson]
*) New -sigopt option to the ca, req and x509 utilities. Additional
signature parameters can be passed using this option and in
particular PSS.
[Steve Henson]
*) Add RSA PSS signing function. This will generate and set the
appropriate AlgorithmIdentifiers for PSS based on those in the
corresponding EVP_MD_CTX structure. No application support yet.
[Steve Henson]
*) Support for companion algorithm specific ASN1 signing routines.
New function ASN1_item_sign_ctx() signs a pre-initialised
EVP_MD_CTX structure and sets AlgorithmIdentifiers based on
the appropriate parameters.
[Steve Henson]
*) Add new algorithm specific ASN1 verification initialisation function
to EVP_PKEY_ASN1_METHOD: this is not in EVP_PKEY_METHOD since the ASN1
handling will be the same no matter what EVP_PKEY_METHOD is used.
Add a PSS handler to support verification of PSS signatures: checked
against a number of sample certificates.
[Steve Henson]
*) Add signature printing for PSS. Add PSS OIDs.
[Steve Henson, Martin Kaiser <>]
*) Add algorithm specific signature printing. An individual ASN1 method
can now print out signatures instead of the standard hex dump.
More complex signatures (e.g. PSS) can print out more meaningful
information. Include DSA version that prints out the signature
parameters r, s.
[Steve Henson]
*) Password based recipient info support for CMS library: implementing
[Steve Henson]
*) Split password based encryption into PBES2 and PBKDF2 functions. This
neatly separates the code into cipher and PBE sections and is required
for some algorithms that split PBES2 into separate pieces (such as
password based CMS).
[Steve Henson]
*) Session-handling fixes:
- Fix handling of connections that are resuming with a session ID,
but also support Session Tickets.
- Fix a bug that suppressed issuing of a new ticket if the client
presented a ticket with an expired session.
- Try to set the ticket lifetime hint to something reasonable.
- Make tickets shorter by excluding irrelevant information.
- On the client side, don't ignore renewed tickets.
[Adam Langley, Bodo Moeller (Google)]
*) Fix PSK session representation.
[Bodo Moeller]
*) Add RC4-MD5 and AESNI-SHA1 "stitched" implementations.
This work was sponsored by Intel.
[Andy Polyakov]
*) Add GCM support to TLS library. Some custom code is needed to split
the IV between the fixed (from PRF) and explicit (from TLS record)
portions. This adds all GCM ciphersuites supported by RFC5288 and
RFC5289. Generalise some AES* cipherstrings to inlclude GCM and
add a special AESGCM string for GCM only.
[Steve Henson]
*) Expand range of ctrls for AES GCM. Permit setting invocation
field on decrypt and retrieval of invocation field only on encrypt.
[Steve Henson]
*) Add HMAC ECC ciphersuites from RFC5289. Include SHA384 PRF support.
As required by RFC5289 these ciphersuites cannot be used if for
versions of TLS earlier than 1.2.
[Steve Henson]
*) For FIPS capable OpenSSL interpret a NULL default public key method
as unset and return the appopriate default but do *not* set the default.
This means we can return the appopriate method in applications that
swicth between FIPS and non-FIPS modes.
[Steve Henson]
*) Redirect HMAC and CMAC operations to FIPS module in FIPS mode. If an
ENGINE is used then we cannot handle that in the FIPS module so we
keep original code iff non-FIPS operations are allowed.
[Steve Henson]
*) Add -attime option to openssl utilities.
[Peter Eckersley <>, Ben Laurie and Steve Henson]
*) Redirect DSA and DH operations to FIPS module in FIPS mode.
[Steve Henson]
*) Redirect ECDSA and ECDH operations to FIPS module in FIPS mode. Also use
FIPS EC methods unconditionally for now.
[Steve Henson]
*) New build option no-ec2m to disable characteristic 2 code.
[Steve Henson]
*) Backport libcrypto audit of return value checking from 1.1.0-dev; not
all cases can be covered as some introduce binary incompatibilities.
[Steve Henson]
*) Redirect RSA operations to FIPS module including keygen,
encrypt, decrypt, sign and verify. Block use of non FIPS RSA methods.
[Steve Henson]
*) Add similar low level API blocking to ciphers.
[Steve Henson]
*) Low level digest APIs are not approved in FIPS mode: any attempt
to use these will cause a fatal error. Applications that *really* want
to use them can use the private_* version instead.
[Steve Henson]
*) Redirect cipher operations to FIPS module for FIPS builds.
[Steve Henson]
*) Redirect digest operations to FIPS module for FIPS builds.
[Steve Henson]
*) Update build system to add "fips" flag which will link in fipscanister.o
for static and shared library builds embedding a signature if needed.
[Steve Henson]
*) Output TLS supported curves in preference order instead of numerical
order. This is currently hardcoded for the highest order curves first.
This should be configurable so applications can judge speed vs strength.
[Steve Henson]
*) Add TLS v1.2 server support for client authentication.
[Steve Henson]
*) Add support for FIPS mode in ssl library: disable SSLv3, non-FIPS ciphers
and enable MD5.
[Steve Henson]
*) Functions FIPS_mode_set() and FIPS_mode() which call the underlying
FIPS modules versions.
[Steve Henson]
*) Add TLS v1.2 client side support for client authentication. Keep cache
of handshake records longer as we don't know the hash algorithm to use
until after the certificate request message is received.
[Steve Henson]
*) Initial TLS v1.2 client support. Add a default signature algorithms
extension including all the algorithms we support. Parse new signature
format in client key exchange. Relax some ECC signing restrictions for
TLS v1.2 as indicated in RFC5246.
[Steve Henson]
*) Add server support for TLS v1.2 signature algorithms extension. Switch
to new signature format when needed using client digest preference.
All server ciphersuites should now work correctly in TLS v1.2. No client
support yet and no support for client certificates.
[Steve Henson]
*) Initial TLS v1.2 support. Add new SHA256 digest to ssl code, switch
to SHA256 for PRF when using TLS v1.2 and later. Add new SHA256 based
ciphersuites. At present only RSA key exchange ciphersuites work with
TLS v1.2. Add new option for TLS v1.2 replacing the old and obsolete
SSL_OP_PKCS1_CHECK flags with SSL_OP_NO_TLSv1_2. New TLSv1.2 methods
and version checking.
[Steve Henson]
*) New option OPENSSL_NO_SSL_INTERN. If an application can be compiled
with this defined it will not be affected by any changes to ssl internal
structures. Add several utility functions to allow openssl application
to work with OPENSSL_NO_SSL_INTERN defined.
[Steve Henson]
*) Add SRP support.
[Tom Wu <> and Ben Laurie]
*) Add functions to copy EVP_PKEY_METHOD and retrieve flags and id.
[Steve Henson]
*) Permit abbreviated handshakes when renegotiating using the function
[Robin Seggelmann <>]
*) Add call to ENGINE_register_all_complete() to
ENGINE_load_builtin_engines(), so some implementations get used
automatically instead of needing explicit application support.
[Steve Henson]
*) Add support for TLS key exporter as described in RFC5705.
[Robin Seggelmann <>, Steve Henson]
*) Initial TLSv1.1 support. Since TLSv1.1 is very similar to TLS v1.0 only
a few changes are required:
Add SSL_OP_NO_TLSv1_1 flag.
Add TLSv1_1 methods.
Update version checking logic to handle version 1.1.
Add explicit IV handling (ported from DTLS code).
Add command line options to s_client/s_server.
[Steve Henson]
Changes between 1.0.0g and 1.0.0h [12 Mar 2012]
*) Fix MMA (Bleichenbacher's attack on PKCS #1 v1.5 RSA padding) weakness
in CMS and PKCS7 code. When RSA decryption fails use a random key for
content decryption and always return the same error. Note: this attack
needs on average 2^20 messages so it only affects automated senders. The
old behaviour can be reenabled in the CMS code by setting the
CMS_DEBUG_DECRYPT flag: this is useful for debugging and testing where
an MMA defence is not necessary.
Thanks to Ivan Nestlerode <> for discovering
this issue. (CVE-2012-0884)
[Steve Henson]
*) Fix CVE-2011-4619: make sure we really are receiving a
client hello before rejecting multiple SGC restarts. Thanks to
Ivan Nestlerode <> for discovering this bug.
[Steve Henson]
Changes between 1.0.0f and 1.0.0g [18 Jan 2012]
*) Fix for DTLS DoS issue introduced by fix for CVE-2011-4109.
Thanks to Antonio Martin, Enterprise Secure Access Research and
Development, Cisco Systems, Inc. for discovering this bug and
preparing a fix. (CVE-2012-0050)
[Antonio Martin]
Changes between 1.0.0e and 1.0.0f [4 Jan 2012]
*) Nadhem Alfardan and Kenny Paterson have discovered an extension
of the Vaudenay padding oracle attack on CBC mode encryption
which enables an efficient plaintext recovery attack against
the OpenSSL implementation of DTLS. Their attack exploits timing
differences arising during decryption processing. A research
paper describing this attack can be found at:
Thanks go to Nadhem Alfardan and Kenny Paterson of the Information
Security Group at Royal Holloway, University of London
( for discovering this flaw and to Robin Seggelmann
<> and Michael Tuexen <>
for preparing the fix. (CVE-2011-4108)
[Robin Seggelmann, Michael Tuexen]
*) Clear bytes used for block padding of SSL 3.0 records.
[Adam Langley (Google)]
*) Only allow one SGC handshake restart for SSL/TLS. Thanks to George
Kadianakis <> for discovering this issue and
Adam Langley for preparing the fix. (CVE-2011-4619)
[Adam Langley (Google)]
*) Check parameters are not NULL in GOST ENGINE. (CVE-2012-0027)
[Andrey Kulikov <>]
*) Prevent malformed RFC3779 data triggering an assertion failure.
Thanks to Andrew Chi, BBN Technologies, for discovering the flaw
and Rob Austein <> for fixing it. (CVE-2011-4577)
[Rob Austein <>]
*) Improved PRNG seeding for VOS.
[Paul Green <>]
*) Fix ssl_ciph.c set-up race.
[Adam Langley (Google)]
*) Fix spurious failures in ecdsatest.c.
[Emilia Käsper (Google)]
*) Fix the BIO_f_buffer() implementation (which was mixing different
interpretations of the '..._len' fields).
[Adam Langley (Google)]
*) Fix handling of BN_BLINDING: now BN_BLINDING_invert_ex (rather than
BN_BLINDING_invert_ex) calls BN_BLINDING_update, ensuring that concurrent
threads won't reuse the same blinding coefficients.
This also avoids the need to obtain the CRYPTO_LOCK_RSA_BLINDING
lock to call BN_BLINDING_invert_ex, and avoids one use of
BN_BLINDING_update for each BN_BLINDING structure (previously,
the last update always remained unused).
[Emilia Käsper (Google)]
*) In ssl3_clear, preserve s3->init_extra along with s3->rbuf.
[Bob Buckholz (Google)]
Changes between 1.0.0d and 1.0.0e [6 Sep 2011]
*) Fix bug where CRLs with nextUpdate in the past are sometimes accepted
by initialising X509_STORE_CTX properly. (CVE-2011-3207)
[Kaspar Brand <>]
*) Fix SSL memory handling for (EC)DH ciphersuites, in particular
for multi-threaded use of ECDH. (CVE-2011-3210)
[Adam Langley (Google)]
*) Fix x509_name_ex_d2i memory leak on bad inputs.
[Bodo Moeller]
*) Remove hard coded ecdsaWithSHA1 signature tests in ssl code and check
signature public key algorithm by using OID xref utilities instead.
Before this you could only use some ECC ciphersuites with SHA1 only.
[Steve Henson]
*) Add protection against ECDSA timing attacks as mentioned in the paper
by Billy Bob Brumley and Nicola Tuveri, see:
[Billy Bob Brumley and Nicola Tuveri]
Changes between 1.0.0c and 1.0.0d [8 Feb 2011]
*) Fix parsing of OCSP stapling ClientHello extension. CVE-2011-0014
[Neel Mehta, Adam Langley, Bodo Moeller (Google)]
*) Fix bug in string printing code: if *any* escaping is enabled we must
escape the escape character (backslash) or the resulting string is
[Steve Henson]
Changes between 1.0.0b and 1.0.0c [2 Dec 2010]
*) Disable code workaround for ancient and obsolete Netscape browsers
and servers: an attacker can use it in a ciphersuite downgrade attack.
Thanks to Martin Rex for discovering this bug. CVE-2010-4180
[Steve Henson]
*) Fixed J-PAKE implementation error, originally discovered by
Sebastien Martini, further info and confirmation from Stefan
Arentz and Feng Hao. Note that this fix is a security fix. CVE-2010-4252
[Ben Laurie]
Changes between 1.0.0a and 1.0.0b [16 Nov 2010]
*) Fix extension code to avoid race conditions which can result in a buffer
overrun vulnerability: resumed sessions must not be modified as they can
be shared by multiple threads. CVE-2010-3864
[Steve Henson]
*) Fix WIN32 build system to correctly link an ENGINE directory into
a DLL.
[Steve Henson]
Changes between 1.0.0 and 1.0.0a [01 Jun 2010]
*) Check return value of int_rsa_verify in pkey_rsa_verifyrecover
[Steve Henson, Peter-Michael Hager <>]
Changes between 0.9.8n and 1.0.0 [29 Mar 2010]
*) Add "missing" function EVP_CIPHER_CTX_copy(). This copies a cipher
context. The operation can be customised via the ctrl mechanism in
case ENGINEs want to include additional functionality.
[Steve Henson]
*) Tolerate yet another broken PKCS#8 key format: private key value negative.
[Steve Henson]
*) Add new -subject_hash_old and -issuer_hash_old options to x509 utility to
output hashes compatible with older versions of OpenSSL.
[Willy Weisz <>]
*) Fix compression algorithm handling: if resuming a session use the
compression algorithm of the resumed session instead of determining
it from client hello again. Don't allow server to change algorithm.
[Steve Henson]
*) Add load_crls() function to apps tidying load_certs() too. Add option
to verify utility to allow additional CRLs to be included.
[Steve Henson]
*) Update OCSP request code to permit adding custom headers to the request:
some responders need this.
[Steve Henson]
*) The function EVP_PKEY_sign() returns <=0 on error: check return code
[Julia Lawall <>]
*) Update verify callback code in apps/s_cb.c and apps/verify.c, it
needlessly dereferenced structures, used obsolete functions and
didn't handle all updated verify codes correctly.
[Steve Henson]
*) Disable MD2 in the default configuration.
[Steve Henson]
*) In BIO_pop() and BIO_push() use the ctrl argument (which was NULL) to
indicate the initial BIO being pushed or popped. This makes it possible
to determine whether the BIO is the one explicitly called or as a result
of the ctrl being passed down the chain. Fix BIO_pop() and SSL BIOs so
it handles reference counts correctly and doesn't zero out the I/O bio
when it is not being explicitly popped. WARNING: applications which
included workarounds for the old buggy behaviour will need to be modified
or they could free up already freed BIOs.
[Steve Henson]
*) Extend the uni2asc/asc2uni => OPENSSL_uni2asc/OPENSSL_asc2uni
renaming to all platforms (within the 0.9.8 branch, this was
done conditionally on Netware platforms to avoid a name clash).
[Guenter <>]
*) Add ECDHE and PSK support to DTLS.
[Michael Tuexen <>]
*) Add CHECKED_STACK_OF macro to safestack.h, otherwise safestack can't
be used on C++.
[Steve Henson]
*) Add "missing" function EVP_MD_flags() (without this the only way to
retrieve a digest flags is by accessing the structure directly. Update
EVP_MD_do_all*() and EVP_CIPHER_do_all*() to include the name a digest
or cipher is registered as in the "from" argument. Print out all
registered digests in the dgst usage message instead of manually
attempting to work them out.
[Steve Henson]
*) If no SSLv2 ciphers are used don't use an SSLv2 compatible client hello:
this allows the use of compression and extensions. Change default cipher
string to remove SSLv2 ciphersuites. This effectively avoids ancient SSLv2
by default unless an application cipher string requests it.
[Steve Henson]
*) Alter match criteria in PKCS12_parse(). It used to try to use local
key ids to find matching certificates and keys but some PKCS#12 files
don't follow the (somewhat unwritten) rules and this strategy fails.
Now just gather all certificates together and the first private key
then look for the first certificate that matches the key.
[Steve Henson]
*) Support use of registered digest and cipher names for dgst and cipher
commands instead of having to add each one as a special case. So now
you can do:
openssl sha256 foo
as well as:
openssl dgst -sha256 foo
and this works for ENGINE based algorithms too.
[Steve Henson]
*) Update Gost ENGINE to support parameter files.
[Victor B. Wagner <>]
*) Support GeneralizedTime in ca utility.
[Oliver Martin <>, Steve Henson]
*) Enhance the hash format used for certificate directory links. The new
form uses the canonical encoding (meaning equivalent names will work
even if they aren't identical) and uses SHA1 instead of MD5. This form
is incompatible with the older format and as a result c_rehash should
be used to rebuild symbolic links.
[Steve Henson]
*) Make PKCS#8 the default write format for private keys, replacing the
traditional format. This form is standardised, more secure and doesn't
include an implicit MD5 dependency.
[Steve Henson]
*) Add a $gcc_devteam_warn option to Configure. The idea is that any code
committed to OpenSSL should pass this lot as a minimum.
[Steve Henson]
*) Add session ticket override functionality for use by EAP-FAST.
[Jouni Malinen <>]
*) Modify HMAC functions to return a value. Since these can be implemented
in an ENGINE errors can occur.
[Steve Henson]
*) Type-checked OBJ_bsearch_ex.
[Ben Laurie]
*) Type-checked OBJ_bsearch. Also some constification necessitated
by type-checking. Still to come: TXT_DB, bsearch(?),
[Ben Laurie]
*) New function OPENSSL_gmtime_adj() to add a specific number of days and
seconds to a tm structure directly, instead of going through OS
specific date routines. This avoids any issues with OS routines such
as the year 2038 bug. New *_adj() functions for ASN1 time structures
and X509_time_adj_ex() to cover the extended range. The existing
X509_time_adj() is still usable and will no longer have any date issues.
[Steve Henson]
*) Delta CRL support. New use deltas option which will attempt to locate
and search any appropriate delta CRLs available.
This work was sponsored by Google.
[Steve Henson]
*) Support for CRLs partitioned by reason code. Reorganise CRL processing
code and add additional score elements. Validate alternate CRL paths
as part of the CRL checking and indicate a new error "CRL path validation
error" in this case. Applications wanting additional details can use
the verify callback and check the new "parent" field. If this is not
NULL CRL path validation is taking place. Existing applications wont
see this because it requires extended CRL support which is off by
This work was sponsored by Google.
[Steve Henson]
*) Support for freshest CRL extension.
This work was sponsored by Google.
[Steve Henson]
*) Initial indirect CRL support. Currently only supported in the CRLs
passed directly and not via lookup. Process certificate issuer
CRL entry extension and lookup CRL entries by bother issuer name
and serial number. Check and process CRL issuer entry in IDP extension.
This work was sponsored by Google.
[Steve Henson]
*) Add support for distinct certificate and CRL paths. The CRL issuer
certificate is validated separately in this case. Only enabled if
an extended CRL support flag is set: this flag will enable additional
CRL functionality in future.
This work was sponsored by Google.
[Steve Henson]
*) Add support for policy mappings extension.
This work was sponsored by Google.
[Steve Henson]
*) Fixes to pathlength constraint, self issued certificate handling,
policy processing to align with RFC3280 and PKITS tests.
This work was sponsored by Google.
[Steve Henson]
*) Support for name constraints certificate extension. DN, email, DNS
and URI types are currently supported.
This work was sponsored by Google.
[Steve Henson]
*) To cater for systems that provide a pointer-based thread ID rather
than numeric, deprecate the current numeric thread ID mechanism and
replace it with a structure and associated callback type. This
mechanism allows a numeric "hash" to be extracted from a thread ID in
either case, and on platforms where pointers are larger than 'long',
mixing is done to help ensure the numeric 'hash' is usable even if it
can't be guaranteed unique. The default mechanism is to use "&errno"
as a pointer-based thread ID to distinguish between threads.
Applications that want to provide their own thread IDs should now use
CRYPTO_THREADID_set_callback() to register a callback that will call
either CRYPTO_THREADID_set_numeric() or CRYPTO_THREADID_set_pointer().
Note that ERR_remove_state() is now deprecated, because it is tied
to the assumption that thread IDs are numeric. ERR_remove_state(0)
to free the current thread's error state should be replaced by
(This new approach replaces the functions CRYPTO_set_idptr_callback(),
CRYPTO_get_idptr_callback(), and CRYPTO_thread_idptr() that existed in
OpenSSL 0.9.9-dev between June 2006 and August 2008. Also, if an
application was previously providing a numeric thread callback that
was inappropriate for distinguishing threads, then uniqueness might
have been obtained with &errno that happened immediately in the
intermediate development versions of OpenSSL; this is no longer the
case, the numeric thread callback will now override the automatic use
of &errno.)
[Geoff Thorpe, with help from Bodo Moeller]
*) Initial support for different CRL issuing certificates. This covers a
simple case where the self issued certificates in the chain exist and
the real CRL issuer is higher in the existing chain.
This work was sponsored by Google.
[Steve Henson]
*) Removed effectively defunct crypto/store from the build.
[Ben Laurie]
*) Revamp of STACK to provide stronger type-checking. Still to come:
TXT_DB, bsearch(?), OBJ_bsearch, qsort, CRYPTO_EX_DATA, ASN1_VALUE,
[Ben Laurie]
*) Add a new SSL_MODE_RELEASE_BUFFERS mode flag to release unused buffer
RAM on SSL connections. This option can save about 34k per idle SSL.
[Nick Mathewson]
*) Revamp of LHASH to provide stronger type-checking. Still to come:
STACK, TXT_DB, bsearch, qsort.
[Ben Laurie]
*) Initial support for Cryptographic Message Syntax (aka CMS) based
on RFC3850, RFC3851 and RFC3852. New cms directory and cms utility,
support for data, signedData, compressedData, digestedData and
encryptedData, envelopedData types included. Scripts to check against
RFC4134 examples draft and interop and consistency checks of many
content types and variants.
[Steve Henson]
*) Add options to enc utility to support use of zlib compression BIO.
[Steve Henson]
*) Extend mk1mf to support importing of options and assembly language
files from Configure script, currently only included in VC-WIN32.
The assembly language rules can now optionally generate the source
files from the associated perl scripts.
[Steve Henson]
*) Implement remaining functionality needed to support GOST ciphersuites.
Interop testing has been performed using CryptoPro implementations.
[Victor B. Wagner <>]
*) s390x assembler pack.
[Andy Polyakov]
*) ARMv4 assembler pack. ARMv4 refers to v4 and later ISA, not CPU
[Andy Polyakov]
*) Implement Opaque PRF Input TLS extension as specified in
draft-rescorla-tls-opaque-prf-input-00.txt. Since this is not an
official specification yet and no extension type assignment by
IANA exists, this extension (for now) will have to be explicitly
enabled when building OpenSSL by providing the extension number
to use. For example, specify an option
to the "config" or "Configure" script to enable the extension,
assuming extension number 0x9527 (which is a completely arbitrary
and unofficial assignment based on the MD5 hash of the Internet
Draft). Note that by doing so, you potentially lose
interoperability with other TLS implementations since these might
be using the same extension number for other purposes.
SSL_set_tlsext_opaque_prf_input(ssl, src, len) is used to set the
opaque PRF input value to use in the handshake. This will create
an interal copy of the length-'len' string at 'src', and will
return non-zero for success.
To get more control and flexibility, provide a callback function
by using
SSL_CTX_set_tlsext_opaque_prf_input_callback(ctx, cb)
SSL_CTX_set_tlsext_opaque_prf_input_callback_arg(ctx, arg)
int (*cb)(SSL *, void *peerinput, size_t len, void *arg);
void *arg;
Callback function 'cb' will be called in handshakes, and is
expected to use SSL_set_tlsext_opaque_prf_input() as appropriate.
Argument 'arg' is for application purposes (the value as given to
SSL_CTX_set_tlsext_opaque_prf_input_callback_arg() will directly
be provided to the callback function). The callback function
has to return non-zero to report success: usually 1 to use opaque
PRF input just if possible, or 2 to enforce use of the opaque PRF
input. In the latter case, the library will abort the handshake
if opaque PRF input is not successfully negotiated.
Arguments 'peerinput' and 'len' given to the callback function
will always be NULL and 0 in the case of a client. A server will
see the client's opaque PRF input through these variables if
available (NULL and 0 otherwise). Note that if the server
provides an opaque PRF input, the length must be the same as the
length of the client's opaque PRF input.
Note that the callback function will only be called when creating
a new session (session resumption can resume whatever was
previously negotiated), and will not be called in SSL 2.0
handshakes; thus, SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2) or
SSL_set_options(ssl, SSL_OP_NO_SSLv2) is especially recommended
for applications that need to enforce opaque PRF input.
[Bodo Moeller]
*) Update ssl code to support digests other than SHA1+MD5 for handshake
[Victor B. Wagner <>]
*) Add RFC4507 support to OpenSSL. This includes the corrections in
RFC4507bis. The encrypted ticket format is an encrypted encoded
SSL_SESSION structure, that way new session features are automatically
If a client application caches session in an SSL_SESSION structure
support is transparent because tickets are now stored in the encoded
The SSL_CTX structure automatically generates keys for ticket
protection in servers so again support should be possible
with no application modification.
If a client or server wishes to disable RFC4507 support then the option
SSL_OP_NO_TICKET can be set.
Add a TLS extension debugging callback to allow the contents of any client
or server extensions to be examined.
This work was sponsored by Google.
[Steve Henson]
*) Final changes to avoid use of pointer pointer casts in OpenSSL.
OpenSSL should now compile cleanly on gcc 4.2
[Peter Hartley <>, Steve Henson]
*) Update SSL library to use new EVP_PKEY MAC API. Include generic MAC
support including streaming MAC support: this is required for GOST
ciphersuite support.
[Victor B. Wagner <>, Steve Henson]
*) Add option -stream to use PKCS#7 streaming in smime utility. New
function i2d_PKCS7_bio_stream() and PEM_write_PKCS7_bio_stream()
to output in BER and PEM format.
[Steve Henson]
*) Experimental support for use of HMAC via EVP_PKEY interface. This
allows HMAC to be handled via the EVP_DigestSign*() interface. The
EVP_PKEY "key" in this case is the HMAC key, potentially allowing
ENGINE support for HMAC keys which are unextractable. New -mac and
-macopt options to dgst utility.
[Steve Henson]
*) New option -sigopt to dgst utility. Update dgst to use
EVP_Digest{Sign,Verify}*. These two changes make it possible to use
alternative signing paramaters such as X9.31 or PSS in the dgst
[Steve Henson]
*) Change ssl_cipher_apply_rule(), the internal function that does
the work each time a ciphersuite string requests enabling
("foo+bar"), moving ("+foo+bar"), disabling ("-foo+bar", or
removing ("!foo+bar") a class of ciphersuites: Now it maintains
the order of disabled ciphersuites such that those ciphersuites
that most recently went from enabled to disabled not only stay
in order with respect to each other, but also have higher priority
than other disabled ciphersuites the next time ciphersuites are
enabled again.
This means that you can now say, e.g., "PSK:-PSK:HIGH" to enable
the same ciphersuites as with "HIGH" alone, but in a specific
order where the PSK ciphersuites come first (since they are the
most recently disabled ciphersuites when "HIGH" is parsed).
Also, change ssl_create_cipher_list() (using this new
funcionality) such that between otherwise identical
cihpersuites, ephemeral ECDH is preferred over ephemeral DH in
the default order.
[Bodo Moeller]
*) Change ssl_create_cipher_list() so that it automatically
arranges the ciphersuites in reasonable order before starting
to process the rule string. Thus, the definition for "DEFAULT"
(SSL_DEFAULT_CIPHER_LIST) now is just "ALL:!aNULL:!eNULL", but
remains equivalent to "AES:ALL:!aNULL:!eNULL:+aECDH:+kRSA:+RC4:@STRENGTH".
This makes it much easier to arrive at a reasonable default order
in applications for which anonymous ciphers are OK (meaning
that you can't actually use DEFAULT).
[Bodo Moeller; suggested by Victor Duchovni]
*) Split the SSL/TLS algorithm mask (as used for ciphersuite string
processing) into multiple integers instead of setting
"SSL_MAC_MASK", and "SSL_SSL_MASK" bits all in a single integer.
(These masks as well as the individual bit definitions are hidden
away into the non-exported interface ssl/ssl_locl.h, so this
change to the definition of the SSL_CIPHER structure shouldn't
affect applications.) This give us more bits for each of these
categories, so there is no longer a need to coagulate AES128 and
AES256 into a single algorithm bit, and to coagulate Camellia128
and Camellia256 into a single algorithm bit, which has led to all
kinds of kludges.
Thus, among other things, the kludge introduced in 0.9.7m and
0.9.8e for masking out AES256 independently of AES128 or masking
out Camellia256 independently of AES256 is not needed here in 0.9.9.
With the change, we also introduce new ciphersuite aliases that
so far were missing: "AES128", "AES256", "CAMELLIA128", and
[Bodo Moeller]
*) Add support for dsa-with-SHA224 and dsa-with-SHA256.
Use the leftmost N bytes of the signature input if the input is
larger than the prime q (with N being the size in bytes of q).
[Nils Larsch]
*) Very *very* experimental PKCS#7 streaming encoder support. Nothing uses
it yet and it is largely untested.
[Steve Henson]
*) Add support for the ecdsa-with-SHA224/256/384/512 signature types.
[Nils Larsch]
*) Initial incomplete changes to avoid need for function casts in OpenSSL
some compilers (gcc 4.2 and later) reject their use. Safestack is
reimplemented. Update ASN1 to avoid use of legacy functions.
[Steve Henson]
*) Win32/64 targets are linked with Winsock2.
[Andy Polyakov]
*) Add an X509_CRL_METHOD structure to allow CRL processing to be redirected
to external functions. This can be used to increase CRL handling
efficiency especially when CRLs are very large by (for example) storing
the CRL revoked certificates in a database.
[Steve Henson]
*) Overhaul of by_dir code. Add support for dynamic loading of CRLs so
new CRLs added to a directory can be used. New command line option
-verify_return_error to s_client and s_server. This causes real errors
to be returned by the verify callback instead of carrying on no matter
what. This reflects the way a "real world" verify callback would behave.
[Steve Henson]
*) GOST engine, supporting several GOST algorithms and public key formats.
Kindly donated by Cryptocom.
*) Partial support for Issuing Distribution Point CRL extension. CRLs
partitioned by DP are handled but no indirect CRL or reason partitioning
(yet). Complete overhaul of CRL handling: now the most suitable CRL is
selected via a scoring technique which handles IDP and AKID in CRLs.
[Steve Henson]
*) New X509_STORE_CTX callbacks lookup_crls() and lookup_certs() which
will ultimately be used for all verify operations: this will remove the
X509_STORE dependency on certificate verification and allow alternative
lookup methods. X509_STORE based implementations of these two callbacks.
[Steve Henson]
*) Allow multiple CRLs to exist in an X509_STORE with matching issuer names.
Modify get_crl() to find a valid (unexpired) CRL if possible.
[Steve Henson]
*) New function X509_CRL_match() to check if two CRLs are identical. Normally
this would be called X509_CRL_cmp() but that name is already used by
a function that just compares CRL issuer names. Cache several CRL
extensions in X509_CRL structure and cache CRLDP in X509.
[Steve Henson]
*) Store a "canonical" representation of X509_NAME structure (ASN1 Name)
this maps equivalent X509_NAME structures into a consistent structure.
Name comparison can then be performed rapidly using memcmp().
[Steve Henson]
*) Non-blocking OCSP request processing. Add -timeout option to ocsp
[Steve Henson]
*) Allow digests to supply their own micalg string for S/MIME type using
[Steve Henson]
*) During PKCS7 signing pass the PKCS7 SignerInfo structure to the
EVP_PKEY_METHOD before and after signing via the EVP_PKEY_CTRL_PKCS7_SIGN
ctrl. It can then customise the structure before and/or after signing
if necessary.
[Steve Henson]
*) New function OBJ_add_sigid() to allow application defined signature OIDs
to be added to OpenSSLs internal tables. New function OBJ_sigid_free()
to free up any added signature OIDs.
[Steve Henson]
*) New functions EVP_CIPHER_do_all(), EVP_CIPHER_do_all_sorted(),
EVP_MD_do_all() and EVP_MD_do_all_sorted() to enumerate internal
digest and cipher tables. New options added to openssl utility:
list-message-digest-algorithms and list-cipher-algorithms.
[Steve Henson]
*) Change the array representation of binary polynomials: the list
of degrees of non-zero coefficients is now terminated with -1.
Previously it was terminated with 0, which was also part of the
value; thus, the array representation was not applicable to
polynomials where t^0 has coefficient zero. This change makes
the array representation useful in a more general context.
[Douglas Stebila]
*) Various modifications and fixes to SSL/TLS cipher string
handling. For ECC, the code now distinguishes between fixed ECDH
with RSA certificates on the one hand and with ECDSA certificates
on the other hand, since these are separate ciphersuites. The
unused code for Fortezza ciphersuites has been removed.
For consistency with EDH, ephemeral ECDH is now called "EECDH"
(not "ECDHE"). For consistency with the code for DH
certificates, use of ECDH certificates is now considered ECDH
authentication, not RSA or ECDSA authentication (the latter is
merely the CA's signing algorithm and not actively used in the
The temporary ciphersuite alias "ECCdraft" is no longer
available, and ECC ciphersuites are no longer excluded from "ALL"
and "DEFAULT". The following aliases now exist for RFC 4492
ciphersuites, most of these by analogy with the DH case:
kECDHr - ECDH cert, signed with RSA
kECDHe - ECDH cert, signed with ECDSA
kECDH - ECDH cert (signed with either RSA or ECDSA)
kEECDH - ephemeral ECDH
ECDH - ECDH cert or ephemeral ECDH
aECDH - ECDH cert
AECDH - anonymous ECDH
EECDH - non-anonymous ephemeral ECDH (equivalent to "kEECDH:-AECDH")
[Bodo Moeller]
*) Add additional S/MIME capabilities for AES and GOST ciphers if supported.
Use correct micalg parameters depending on digest(s) in signed message.
[Steve Henson]
*) Add engine support for EVP_PKEY_ASN1_METHOD. Add functions to process
an ENGINE asn1 method. Support ENGINE lookups in the ASN1 code.
[Steve Henson]
*) Initial engine support for EVP_PKEY_METHOD. New functions to permit
an engine to register a method. Add ENGINE lookups for methods and
functional reference processing.
[Steve Henson]
*) New functions EVP_Digest{Sign,Verify)*. These are enchance versions of
EVP_{Sign,Verify}* which allow an application to customise the signature
[Steve Henson]
*) New -resign option to smime utility. This adds one or more signers
to an existing PKCS#7 signedData structure. Also -md option to use an
alternative message digest algorithm for signing.
[Steve Henson]
*) Tidy up PKCS#7 routines and add new functions to make it easier to
create PKCS7 structures containing multiple signers. Update smime
application to support multiple signers.
[Steve Henson]
*) New -macalg option to pkcs12 utility to allow setting of an alternative
digest MAC.
[Steve Henson]
*) Initial support for PKCS#5 v2.0 PRFs other than default SHA1 HMAC.
Reorganize PBE internals to lookup from a static table using NIDs,
add support for HMAC PBE OID translation. Add a EVP_CIPHER ctrl:
EVP_CTRL_PBE_PRF_NID this allows a cipher to specify an alternative
PRF which will be automatically used with PBES2.
[Steve Henson]
*) Replace the algorithm specific calls to generate keys in "req" with the
new API.
[Steve Henson]
*) Update PKCS#7 enveloped data routines to use new API. This is now
supported by any public key method supporting the encrypt operation. A
ctrl is added to allow the public key algorithm to examine or modify
the PKCS#7 RecipientInfo structure if it needs to: for RSA this is
a no op.
[Steve Henson]
*) Add a ctrl to asn1 method to allow a public key algorithm to express
a default digest type to use. In most cases this will be SHA1 but some
algorithms (such as GOST) need to specify an alternative digest. The
return value indicates how strong the prefernce is 1 means optional and
2 is mandatory (that is it is the only supported type). Modify
ASN1_item_sign() to accept a NULL digest argument to indicate it should
use the default md. Update openssl utilities to use the default digest
type for signing if it is not explicitly indicated.
[Steve Henson]
*) Use OID cross reference table in ASN1_sign() and ASN1_verify(). New
EVP_MD flag EVP_MD_FLAG_PKEY_METHOD_SIGNATURE. This uses the relevant
signing method from the key type. This effectively removes the link
between digests and public key types.
[Steve Henson]
*) Add an OID cross reference table and utility functions. Its purpose is to
translate between signature OIDs such as SHA1WithrsaEncryption and SHA1,
rsaEncryption. This will allow some of the algorithm specific hackery
needed to use the correct OID to be removed.
[Steve Henson]
*) Remove algorithm specific dependencies when setting PKCS7_SIGNER_INFO
structures for PKCS7_sign(). They are now set up by the relevant public
key ASN1 method.
[Steve Henson]
*) Add provisional EC pkey method with support for ECDSA and ECDH.
[Steve Henson]
*) Add support for key derivation (agreement) in the API, DH method and
[Steve Henson]
*) Add DSA pkey method and DH pkey methods, extend DH ASN1 method to support
public and private key formats. As a side effect these add additional
command line functionality not previously available: DSA signatures can be
generated and verified using pkeyutl and DH key support and generation in
pkey, genpkey.
[Steve Henson]
*) BeOS support.
[Oliver Tappe <>]
*) New make target "install_html_docs" installs HTML renditions of the
manual pages.
[Oliver Tappe <>]
*) New utility "genpkey" this is analagous to "genrsa" etc except it can
generate keys for any algorithm. Extend and update EVP_PKEY_METHOD to
support key and parameter generation and add initial key generation
functionality for RSA.
[Steve Henson]
*) Add functions for main EVP_PKEY_method operations. The undocumented
functions EVP_PKEY_{encrypt,decrypt} have been renamed to
[Steve Henson]
*) Initial definitions for EVP_PKEY_METHOD. This will be a high level public
key API, doesn't do much yet.
[Steve Henson]
*) New function EVP_PKEY_asn1_get0_info() to retrieve information about
public key algorithms. New option to openssl utility:
"list-public-key-algorithms" to print out info.
[Steve Henson]
*) Implement the Supported Elliptic Curves Extension for
ECC ciphersuites from draft-ietf-tls-ecc-12.txt.
[Douglas Stebila]
*) Don't free up OIDs in OBJ_cleanup() if they are in use by EVP_MD or
EVP_CIPHER structures to avoid later problems in EVP_cleanup().
[Steve Henson]
*) New utilities pkey and pkeyparam. These are similar to algorithm specific
utilities such as rsa, dsa, dsaparam etc except they process any key
[Steve Henson]
*) Transfer public key printing routines to EVP_PKEY_ASN1_METHOD. New
functions EVP_PKEY_print_public(), EVP_PKEY_print_private(),
EVP_PKEY_print_param() to print public key data from an EVP_PKEY
[Steve Henson]
*) Initial support for pluggable public key ASN1.
De-spaghettify the public key ASN1 handling. Move public and private
key ASN1 handling to a new EVP_PKEY_ASN1_METHOD structure. Relocate
algorithm specific handling to a single module within the relevant
algorithm directory. Add functions to allow (near) opaque processing
of public and private key structures.
[Steve Henson]
*) Implement the Supported Point Formats Extension for
ECC ciphersuites from draft-ietf-tls-ecc-12.txt.
[Douglas Stebila]
*) Add initial support for RFC 4279 PSK TLS ciphersuites. Add members
for the psk identity [hint] and the psk callback functions to the
SSL_SESSION, SSL and SSL_CTX structure.
New ciphersuites:
New functions:
[Mika Kousa and Pasi Eronen of Nokia Corporation]
*) Add RFC 3161 compliant time stamp request creation, response generation
and response verification functionality.
[Zoltán Glózik <>, The OpenTSA Project]
*) Add initial support for TLS extensions, specifically for the server_name
extension so far. The SSL_SESSION, SSL_CTX, and SSL data structures now
have new members for a host name. The SSL data structure has an
additional member SSL_CTX *initial_ctx so that new sessions can be
stored in that context to allow for session resumption, even after the
SSL has been switched to a new SSL_CTX in reaction to a client's
server_name extension.
New functions (subject to change):
New CTRL codes and macros (subject to change):
- SSL_CTX_set_tlsext_servername_callback()
- SSL_CTX_set_tlsext_servername_arg()
SSL_CTRL_SET_TLSEXT_HOSTNAME - SSL_set_tlsext_host_name()
openssl s_client has a new '-servername ...' option.
openssl s_server has new options '-servername_host ...', '-cert2 ...',
'-key2 ...', '-servername_fatal' (subject to change). This allows
testing the HostName extension for a specific single host name ('-cert'
and '-key' remain fallbacks for handshakes without HostName
negotiation). If the unrecogninzed_name alert has to be sent, this by
default is a warning; it becomes fatal with the '-servername_fatal'
[Peter Sylvester, Remy Allais, Christophe Renou]
*) Whirlpool hash implementation is added.
[Andy Polyakov]
*) BIGNUM code on 64-bit SPARCv9 targets is switched from bn(64,64) to
bn(64,32). Because of instruction set limitations it doesn't have
any negative impact on performance. This was done mostly in order
to make it possible to share assembler modules, such as bn_mul_mont
implementations, between 32- and 64-bit builds without hassle.
[Andy Polyakov]
*) Move code previously exiled into file crypto/ec/ec2_smpt.c
to ec2_smpl.c, and no longer require the OPENSSL_EC_BIN_PT_COMP
[Bodo Moeller]
*) New candidate for BIGNUM assembler implementation, bn_mul_mont,
dedicated Montgomery multiplication procedure, is introduced.
BN_MONT_CTX is modified to allow bn_mul_mont to reach for higher
"64-bit" performance on certain 32-bit targets.
[Andy Polyakov]
*) New option SSL_OP_NO_COMP to disable use of compression selectively
in SSL structures. New SSL ctrl to set maximum send fragment size.
Save memory by seeting the I/O buffer sizes dynamically instead of
using the maximum available value.
[Steve Henson]
*) New option -V for 'openssl ciphers'. This prints the ciphersuite code
in addition to the text details.
[Bodo Moeller]
*) Very, very preliminary EXPERIMENTAL support for printing of general
ASN1 structures. This currently produces rather ugly output and doesn't
handle several customised structures at all.
[Steve Henson]
*) Integrated support for PVK file format and some related formats such
as MS PUBLICKEYBLOB and PRIVATEKEYBLOB. Command line switches to support
these in the 'rsa' and 'dsa' utilities.
[Steve Henson]
*) Support for PKCS#1 RSAPublicKey format on rsa utility command line.
[Steve Henson]
*) Remove the ancient ASN1_METHOD code. This was only ever used in one
place for the (very old) "NETSCAPE" format certificates which are now
handled using new ASN1 code equivalents.
[Steve Henson]
*) Let the TLSv1_method() etc. functions return a 'const' SSL_METHOD
pointer and make the SSL_METHOD parameter in SSL_CTX_new,
SSL_CTX_set_ssl_version and SSL_set_ssl_method 'const'.
[Nils Larsch]
*) Modify CRL distribution points extension code to print out previously
unsupported fields. Enhance extension setting code to allow setting of
all fields.
[Steve Henson]
*) Add print and set support for Issuing Distribution Point CRL extension.
[Steve Henson]
*) Change 'Configure' script to enable Camellia by default.
Changes between 0.9.8m and 0.9.8n [24 Mar 2010]
*) When rejecting SSL/TLS records due to an incorrect version number, never
update s->server with a new major version number. As of
- OpenSSL 0.9.8m if 'short' is a 16-bit type,
- OpenSSL 0.9.8f if 'short' is longer than 16 bits,
the previous behavior could result in a read attempt at NULL when
receiving specific incorrect SSL/TLS records once record payload
protection is active. (CVE-2010-0740)
[Bodo Moeller, Adam Langley <>]
*) Fix for CVE-2010-0433 where some kerberos enabled versions of OpenSSL
could be crashed if the relevant tables were not present (e.g. chrooted).
[Tomas Hoger <>]
Changes between 0.9.8l and 0.9.8m [25 Feb 2010]
*) Always check bn_wexpend() return values for failure. (CVE-2009-3245)
[Martin Olsson, Neel Mehta]
*) Fix X509_STORE locking: Every 'objs' access requires a lock (to
accommodate for stack sorting, always a write lock!).
[Bodo Moeller]
*) On some versions of WIN32 Heap32Next is very slow. This can cause
excessive delays in the RAND_poll(): over a minute. As a workaround
include a time check in the inner Heap32Next loop too.
[Steve Henson]
*) The code that handled flushing of data in SSL/TLS originally used the
BIO_CTRL_INFO ctrl to see if any data was pending first. This caused
the problem outlined in PR#1949. The fix suggested there however can
trigger problems with buggy BIO_CTRL_WPENDING (e.g. some versions
of Apache). So instead simplify the code to flush unconditionally.
This should be fine since flushing with no data to flush is a no op.
[Steve Henson]
*) Handle TLS versions 2.0 and later properly and correctly use the
highest version of TLS/SSL supported. Although TLS >= 2.0 is some way
off ancient servers have a habit of sticking around for a while...
[Steve Henson]
*) Modify compression code so it frees up structures without using the
ex_data callbacks. This works around a problem where some applications
call CRYPTO_cleanup_all_ex_data() before application exit (e.g. when
restarting) then use compression (e.g. SSL with compression) later.
This results in significant per-connection memory leaks and
has caused some security issues including CVE-2008-1678 and
[Steve Henson]
*) Constify crypto/cast (i.e., <openssl/cast.h>): a CAST_KEY doesn't
change when encrypting or decrypting.
[Bodo Moeller]
*) Add option SSL_OP_LEGACY_SERVER_CONNECT which will allow clients to
connect and renegotiate with servers which do not support RI.
Until RI is more widely deployed this option is enabled by default.
[Steve Henson]
*) Add "missing" ssl ctrls to clear options and mode.
[Steve Henson]
*) If client attempts to renegotiate and doesn't support RI respond with
a no_renegotiation alert as required by RFC5746. Some renegotiating
TLS clients will continue a connection gracefully when they receive
the alert. Unfortunately OpenSSL mishandled this alert and would hang
waiting for a server hello which it will never receive. Now we treat a
received no_renegotiation alert as a fatal error. This is because
applications requesting a renegotiation might well expect it to succeed
and would have no code in place to handle the server denying it so the
only safe thing to do is to terminate the connection.
[Steve Henson]
*) Add ctrl macro SSL_get_secure_renegotiation_support() which returns 1 if
peer supports secure renegotiation and 0 otherwise. Print out peer
renegotiation support in s_client/s_server.
[Steve Henson]
*) Replace the highly broken and deprecated SPKAC certification method with
the updated NID creation version. This should correctly handle UTF8.
[Steve Henson]
*) Implement RFC5746. Re-enable renegotiation but require the extension
turns out to be a bad idea. It has been replaced by
SSL_CTX_set_options(). This is really not recommended unless you
know what you are doing.
[Eric Rescorla <>, Ben Laurie, Steve Henson]
*) Fixes to stateless session resumption handling. Use initial_ctx when
issuing and attempting to decrypt tickets in case it has changed during
servername handling. Use a non-zero length session ID when attempting
stateless session resumption: this makes it possible to determine if
a resumption has occurred immediately after receiving server hello
(several places in OpenSSL subtly assume this) instead of later in
the handshake.
[Steve Henson]
*) The functions ENGINE_ctrl(), OPENSSL_isservice(),
CMS_get1_RecipientRequest() and RAND_bytes() can return <=0 on error
fixes for a few places where the return code is not checked
[Julia Lawall <>]
*) Add --strict-warnings option to Configure script to include devteam
warnings in other configurations.
[Steve Henson]
*) Add support for --libdir option and LIBDIR variable in makefiles. This
makes it possible to install openssl libraries in locations which
have names other than "lib", for example "/usr/lib64" which some
systems need.
[Steve Henson, based on patch from Jeremy Utley]
*) Don't allow the use of leading 0x80 in OIDs. This is a violation of
X690 8.9.12 and can produce some misleading textual output of OIDs.
[Steve Henson, reported by Dan Kaminsky]
*) Delete MD2 from algorithm tables. This follows the recommendation in
several standards that it is not used in new applications due to
several cryptographic weaknesses. For binary compatibility reasons
the MD2 API is still compiled in by default.
[Steve Henson]
*) Add compression id to {d2i,i2d}_SSL_SESSION so it is correctly saved
and restored.
[Steve Henson]
*) Rename uni2asc and asc2uni functions to OPENSSL_uni2asc and
OPENSSL_asc2uni conditionally on Netware platforms to avoid a name
[Guenter <>]
*) Fix the server certificate chain building code to use X509_verify_cert(),
it used to have an ad-hoc builder which was unable to cope with anything
other than a simple chain.
[David Woodhouse <>, Steve Henson]
*) Don't check self signed certificate signatures in X509_verify_cert()
by default (a flag can override this): it just wastes time without
adding any security. As a useful side effect self signed root CAs
with non-FIPS digests are now usable in FIPS mode.
[Steve Henson]
*) In dtls1_process_out_of_seq_message() the check if the current message
is already buffered was missing. For every new message was memory
allocated, allowing an attacker to perform an denial of service attack
with sending out of seq handshake messages until there is no memory
left. Additionally every future messege was buffered, even if the
sequence number made no sense and would be part of another handshake.
So only messages with sequence numbers less than 10 in advance will be
buffered. (CVE-2009-1378)
[Robin Seggelmann, discovered by Daniel Mentz]
*) Records are buffered if they arrive with a future epoch to be
processed after finishing the corresponding handshake. There is
currently no limitation to this buffer allowing an attacker to perform
a DOS attack with sending records with future epochs until there is no
memory left. This patch adds the pqueue_size() function to detemine
the size of a buffer and limits the record buffer to 100 entries.
[Robin Seggelmann, discovered by Daniel Mentz]
*) Keep a copy of frag->msg_header.frag_len so it can be used after the
parent structure is freed. (CVE-2009-1379)
[Daniel Mentz]
*) Handle non-blocking I/O properly in SSL_shutdown() call.
[Darryl Miles <>]
*) Add 2.5.4.* OIDs
[Ilya O. <>]
Changes between 0.9.8k and 0.9.8l [5 Nov 2009]
*) Disable renegotiation completely - this fixes a severe security
problem (CVE-2009-3555) at the cost of breaking all
renegotiation. Renegotiation can be re-enabled by setting
run-time. This is really not recommended unless you know what
you're doing.
[Ben Laurie]
Changes between 0.9.8j and 0.9.8k [25 Mar 2009]
*) Don't set val to NULL when freeing up structures, it is freed up by
underlying code. If sizeof(void *) > sizeof(long) this can result in
zeroing past the valid field. (CVE-2009-0789)
[Paolo Ganci <Paolo.Ganci@AdNovum.CH>]
*) Fix bug where return value of CMS_SignerInfo_verify_content() was not
checked correctly. This would allow some invalid signed attributes to
appear to verify correctly. (CVE-2009-0591)
[Ivan Nestlerode <>]
*) Reject UniversalString and BMPString types with invalid lengths. This
prevents a crash in ASN1_STRING_print_ex() which assumes the strings have
a legal length. (CVE-2009-0590)
[Steve Henson]
*) Set S/MIME signing as the default purpose rather than setting it
unconditionally. This allows applications to override it at the store
[Steve Henson]
*) Permit restricted recursion of ASN1 strings. This is needed in practice
to handle some structures.
[Steve Henson]
*) Improve efficiency of mem_gets: don't search whole buffer each time
for a '\n'
[Jeremy Shapiro <>]
*) New -hex option for openssl rand.
[Matthieu Herrb]
*) Print out UTF8String and NumericString when parsing ASN1.
[Steve Henson]
*) Support NumericString type for name components.
[Steve Henson]
*) Allow CC in the environment to override the automatically chosen
compiler. Note that nothing is done to ensure flags work with the
chosen compiler.
[Ben Laurie]
Changes between 0.9.8i and 0.9.8j [07 Jan 2009]
*) Properly check EVP_VerifyFinal() and similar return values
[Ben Laurie, Bodo Moeller, Google Security Team]
*) Enable TLS extensions by default.
[Ben Laurie]
*) Allow the CHIL engine to be loaded, whether the application is
multithreaded or not. (This does not release the developer from the
obligation to set up the dynamic locking callbacks.)
[Sander Temme <>]
*) Use correct exit code if there is an error in dgst command.
[Steve Henson; problem pointed out by Roland Dirlewanger]
*) Tweak Configure so that you need to say "experimental-jpake" to enable
JPAKE, and need to use -DOPENSSL_EXPERIMENTAL_JPAKE in applications.
[Bodo Moeller]
*) Add experimental JPAKE support, including demo authentication in
s_client and s_server.
[Ben Laurie]
*) Set the comparison function in v3_addr_canonize().
[Rob Austein <>]
*) Add support for XMPP STARTTLS in s_client.
[Philip Paeps <>]
*) Change the server-side SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG behavior
to ensure that even with this option, only ciphersuites in the
server's preference list will be accepted. (Note that the option
applies only when resuming a session, so the earlier behavior was
just about the algorithm choice for symmetric cryptography.)
[Bodo Moeller]
Changes between 0.9.8h and 0.9.8i [15 Sep 2008]
*) Fix NULL pointer dereference if a DTLS server received
ChangeCipherSpec as first record (CVE-2009-1386).
[PR #1679]
*) Fix a state transitition in s3_srvr.c and d1_srvr.c
(was using SSL3_ST_CW_CLNT_HELLO_B, should be ..._ST_SW_SRVR_...).
[Nagendra Modadugu]
*) The fix in 0.9.8c that supposedly got rid of unsafe
double-checked locking was incomplete for RSA blinding,
addressing just one layer of what turns out to have been
doubly unsafe triple-checked locking.
So now fix this for real by retiring the MONT_HELPER macro
in crypto/rsa/rsa_eay.c.
[Bodo Moeller; problem pointed out by Marius Schilder]
*) Various precautionary measures:
- Avoid size_t integer overflow in HASH_UPDATE (md32_common.h).
- Avoid a buffer overflow in d2i_SSL_SESSION() (ssl_asn1.c).
(NB: This would require knowledge of the secret session ticket key
to exploit, in which case you'd be SOL either way.)
- Change bn_nist.c so that it will properly handle input BIGNUMs
outside the expected range.
- Enforce the 'num' check in BN_div() (bn_div.c) for non-BN_DEBUG
[Neel Mehta, Bodo Moeller]
*) Allow engines to be "soft loaded" - i.e. optionally don't die if
the load fails. Useful for distros.
[Ben Laurie and the FreeBSD team]
*) Add support for Local Machine Keyset attribute in PKCS#12 files.
[Steve Henson]
*) Fix BN_GF2m_mod_arr() top-bit cleanup code.
[Huang Ying]
*) Expand ENGINE to support engine supplied SSL client certificate functions.
This work was sponsored by Logica.
[Steve Henson]
*) Add CryptoAPI ENGINE to support use of RSA and DSA keys held in Windows
keystores. Support for SSL/TLS client authentication too.
Not compiled unless enable-capieng specified to Configure.
This work was sponsored by Logica.
[Steve Henson]
*) Fix bug in X509_ATTRIBUTE creation: dont set attribute using
ASN1_TYPE_set1 if MBSTRING flag set. This bug would crash certain
attribute creation routines such as certifcate requests and PKCS#12
[Steve Henson]
Changes between 0.9.8g and 0.9.8h [28 May 2008]
*) Fix flaw if 'Server Key exchange message' is omitted from a TLS
handshake which could lead to a cilent crash as found using the
Codenomicon TLS test suite (CVE-2008-1672)
[Steve Henson, Mark Cox]
*) Fix double free in TLS server name extensions which could lead to
a remote crash found by Codenomicon TLS test suite (CVE-2008-0891)
[Joe Orton]
*) Clear error queue in SSL_CTX_use_certificate_chain_file()
Clear the error queue to ensure that error entries left from
older function calls do not interfere with the correct operation.
[Lutz Jaenicke, Erik de Castro Lopo]
*) Remove root CA certificates of commercial CAs:
The OpenSSL project does not recommend any specific CA and does not
have any policy with respect to including or excluding any CA.
Therefore it does not make any sense to ship an arbitrary selection
of root CA certificates with the OpenSSL software.
[Lutz Jaenicke]
*) RSA OAEP patches to fix two separate invalid memory reads.
The first one involves inputs when 'lzero' is greater than
'SHA_DIGEST_LENGTH' (it would read about SHA_DIGEST_LENGTH bytes
before the beginning of from). The second one involves inputs where
the 'db' section contains nothing but zeroes (there is a one-byte
invalid read after the end of 'db').
[Ivan Nestlerode <>]
*) Partial backport from 0.9.9-dev:
Introduce bn_mul_mont (dedicated Montgomery multiplication
procedure) as a candidate for BIGNUM assembler implementation.
While 0.9.9-dev uses assembler for various architectures, only
x86_64 is available by default here in the 0.9.8 branch, and
32-bit x86 is available through a compile-time setting.
To try the 32-bit x86 assembler implementation, use Configure
option "enable-montasm" (which exists only for this backport).
As "enable-montasm" for 32-bit x86 disclaims code stability
anyway, in this constellation we activate additional code
backported from 0.9.9-dev for further performance improvements,
namely BN_from_montgomery_word. (To enable this otherwise,
e.g. x86_64, try "-DMONT_FROM_WORD___NON_DEFAULT_0_9_8_BUILD".)
[Andy Polyakov (backport partially by Bodo Moeller)]
*) Add TLS session ticket callback. This allows an application to set
TLS ticket cipher and HMAC keys rather than relying on hardcoded fixed
values. This is useful for key rollover for example where several key
sets may exist with different names.
[Steve Henson]
*) Reverse ENGINE-internal logic for caching default ENGINE handles.
This was broken until now in 0.9.8 releases, such that the only way
a registered ENGINE could be used (assuming it initialises
successfully on the host) was to explicitly set it as the default
for the relevant algorithms. This is in contradiction with 0.9.7
behaviour and the documentation. With this fix, when an ENGINE is
registered into a given algorithm's table of implementations, the
'uptodate' flag is reset so that auto-discovery will be used next
time a new context for that algorithm attempts to select an
[Ian Lister (tweaked by Geoff Thorpe)]
*) Backport of CMS code to OpenSSL 0.9.8. This differs from the 0.9.9
implemention in the following ways:
Lack of EVP_PKEY_ASN1_METHOD means algorithm parameters have to be
hard coded.
Lack of BER streaming support means one pass streaming processing is
only supported if data is detached: setting the streaming flag is
ignored for embedded content.
CMS support is disabled by default and must be explicitly enabled
with the enable-cms configuration option.
[Steve Henson]
*) Update the GMP engine glue to do direct copies between BIGNUM and
mpz_t when openssl and GMP use the same limb size. Otherwise the
existing "conversion via a text string export" trick is still used.
[Paul Sheer <>]
*) Zlib compression BIO. This is a filter BIO which compressed and
uncompresses any data passed through it.
[Steve Henson]
*) Add AES_wrap_key() and AES_unwrap_key() functions to implement
RFC3394 compatible AES key wrapping.
[Steve Henson]
*) Add utility functions to handle ASN1 structures. ASN1_STRING_set0():
sets string data without copying. X509_ALGOR_set0() and
X509_ALGOR_get0(): set and retrieve X509_ALGOR (AlgorithmIdentifier)
data. Attribute function X509at_get0_data_by_OBJ(): retrieves data
from an X509_ATTRIBUTE structure optionally checking it occurs only
once. ASN1_TYPE_set1(): set and ASN1_TYPE structure copying supplied
[Steve Henson]
*) Fix BN flag handling in RSA_eay_mod_exp() and BN_MONT_CTX_set()
to get the expected BN_FLG_CONSTTIME behavior.
[Bodo Moeller (Google)]
*) Netware support:
- fixed wrong usage of ioctlsocket() when build for LIBC BSD sockets
- fixed to run the test suite with CLIB builds too (CLIB_OPT)
- added some more tests to
- fixed RunningProcess usage so that it works with newer LIBC NDKs too
- removed usage of BN_LLONG for CLIB builds to avoid runtime dependency
- added new Configure targets netware-clib-bsdsock, netware-clib-gcc,
netware-clib-bsdsock-gcc, netware-libc-bsdsock-gcc
- various changes to to enable gcc-cross builds on Win32
- changed crypto/bio/b_sock.c to work with macro functions (CLIB BSD)
- various changes to fix missing prototype warnings
- fixed to create correct asm files for NASM COFF output
- added AES, WHIRLPOOL and CPUID assembler code to build files
- added missing AES assembler make rules to
- fixed order of includes in apps/ocsp.c so that e_os.h settings apply
[Guenter Knauf <>]
*) Implement certificate status request TLS extension defined in RFC3546.
A client can set the appropriate parameters and receive the encoded
OCSP response via a callback. A server can query the supplied parameters
and set the encoded OCSP response in the callback. Add simplified examples
to s_client and s_server.
[Steve Henson]
Changes between 0.9.8f and 0.9.8g [19 Oct 2007]
*) Fix various bugs:
+ Binary incompatibility of ssl_ctx_st structure
+ DTLS interoperation with non-compliant servers
+ Don't call get_session_cb() without proposed session
+ Fix ia64 assembler code
[Andy Polyakov, Steve Henson]
Changes between 0.9.8e and 0.9.8f [11 Oct 2007]
*) DTLS Handshake overhaul. There were longstanding issues with
OpenSSL DTLS implementation, which were making it impossible for
RFC 4347 compliant client to communicate with OpenSSL server.
Unfortunately just fixing these incompatibilities would "cut off"
pre-0.9.8f clients. To allow for hassle free upgrade post-0.9.8e
server keeps tolerating non RFC compliant syntax. The opposite is
not true, 0.9.8f client can not communicate with earlier server.
This update even addresses CVE-2007-4995.
[Andy Polyakov]
*) Changes to avoid need for function casts in OpenSSL: some compilers
(gcc 4.2 and later) reject their use.
[Kurt Roeckx <>, Peter Hartley <>,
Steve Henson]
*) Add RFC4507 support to OpenSSL. This includes the corrections in
RFC4507bis. The encrypted ticket format is an encrypted encoded
SSL_SESSION structure, that way new session features are automatically
If a client application caches session in an SSL_SESSION structure
support is transparent because tickets are now stored in the encoded
The SSL_CTX structure automatically generates keys for ticket
protection in servers so again support should be possible
with no application modification.
If a client or server wishes to disable RFC4507 support then the option
SSL_OP_NO_TICKET can be set.
Add a TLS extension debugging callback to allow the contents of any client
or server extensions to be examined.
This work was sponsored by Google.
[Steve Henson]
*) Add initial support for TLS extensions, specifically for the server_name
extension so far. The SSL_SESSION, SSL_CTX, and SSL data structures now
have new members for a host name. The SSL data structure has an
additional member SSL_CTX *initial_ctx so that new sessions can be
stored in that context to allow for session resumption, even after the
SSL has been switched to a new SSL_CTX in reaction to a client's
server_name extension.
New functions (subject to change):
New CTRL codes and macros (subject to change):
- SSL_CTX_set_tlsext_servername_callback()
- SSL_CTX_set_tlsext_servername_arg()
SSL_CTRL_SET_TLSEXT_HOSTNAME - SSL_set_tlsext_host_name()
openssl s_client has a new '-servername ...' option.
openssl s_server has new options '-servername_host ...', '-cert2 ...',
'-key2 ...', '-servername_fatal' (subject to change). This allows
testing the HostName extension for a specific single host name ('-cert'
and '-key' remain fallbacks for handshakes without HostName
negotiation). If the unrecogninzed_name alert has to be sent, this by
default is a warning; it becomes fatal with the '-servername_fatal'
[Peter Sylvester, Remy Allais, Christophe Renou, Steve Henson]
*) Add AES and SSE2 assembly language support to VC++ build.
[Steve Henson]
*) Mitigate attack on final subtraction in Montgomery reduction.
[Andy Polyakov]
*) Fix crypto/ec/ec_mult.c to work properly with scalars of value 0
(which previously caused an internal error).
[Bodo Moeller]
*) Squeeze another 10% out of IGE mode when in != out.
[Ben Laurie]
*) AES IGE mode speedup.
[Dean Gaudet (Google)]
*) Add the Korean symmetric 128-bit cipher SEED (see and
add SEED ciphersuites from RFC 4162:
To minimize changes between patchlevels in the OpenSSL 0.9.8
series, SEED remains excluded from compilation unless OpenSSL
is configured with 'enable-seed'.
[KISA, Bodo Moeller]
*) Mitigate branch prediction attacks, which can be practical if a
single processor is shared, allowing a spy process to extract
information. For detailed background information, see (O. Aciicmez, S. Gueron,
J.-P. Seifert, "New Branch Prediction Vulnerabilities in OpenSSL
and Necessary Software Countermeasures"). The core of the change
are new versions BN_div_no_branch() and
BN_mod_inverse_no_branch() of BN_div() and BN_mod_inverse(),
respectively, which are slower, but avoid the security-relevant
conditional branches. These are automatically called by BN_div()
and BN_mod_inverse() if the flag BN_FLG_CONSTTIME is set for one
of the input BIGNUMs. Also, BN_is_bit_set() has been changed to
remove a conditional branch.
BN_FLG_CONSTTIME is the new name for the previous
BN_FLG_EXP_CONSTTIME flag, since it now affects more than just
modular exponentiation. (Since OpenSSL 0.9.7h, setting this flag
in the exponent causes BN_mod_exp_mont() to use the alternative
implementation in BN_mod_exp_mont_consttime().) The old name
remains as a deprecated alias.
Similary, RSA_FLAG_NO_EXP_CONSTTIME is replaced by a more general
RSA_FLAG_NO_CONSTTIME flag since the RSA implementation now uses
constant-time implementations for more than just exponentiation.
Here too the old name is kept as a deprecated alias.
BN_BLINDING_new() will now use BN_dup() for the modulus so that
the BN_BLINDING structure gets an independent copy of the
modulus. This means that the previous "BIGNUM *m" argument to
BN_BLINDING_new() and to BN_BLINDING_create_param() now
essentially becomes "const BIGNUM *m", although we can't actually
change this in the header file before 0.9.9. It allows
RSA_setup_blinding() to use BN_with_flags() on the modulus to
[Matthew D Wood (Intel Corp)]
*) In the SSL/TLS server implementation, be strict about session ID
context matching (which matters if an application uses a single
external cache for different purposes). Previously,
out-of-context reuse was forbidden only if SSL_VERIFY_PEER was
set. This did ensure strict client verification, but meant that,
with applications using a single external cache for quite
different requirements, clients could circumvent ciphersuite
restrictions for a given session ID context by starting a session
in a different context.
[Bodo Moeller]
*) Include "!eNULL" in SSL_DEFAULT_CIPHER_LIST to make sure that
a ciphersuite string such as "DEFAULT:RSA" cannot enable
authentication-only ciphersuites.
[Bodo Moeller]
*) Update the SSL_get_shared_ciphers() fix CVE-2006-3738 which was
not complete and could lead to a possible single byte overflow
(CVE-2007-5135) [Ben Laurie]
Changes between 0.9.8d and 0.9.8e [23 Feb 2007]
*) Since AES128 and AES256 (and similarly Camellia128 and
Camellia256) share a single mask bit in the logic of
ssl/ssl_ciph.c, the code for masking out disabled ciphers needs a
kludge to work properly if AES128 is available and AES256 isn't
(or if Camellia128 is available and Camellia256 isn't).
[Victor Duchovni]
*) Fix the BIT STRING encoding generated by crypto/ec/ec_asn1.c
(within i2d_ECPrivateKey, i2d_ECPKParameters, i2d_ECParameters):
When a point or a seed is encoded in a BIT STRING, we need to
prevent the removal of trailing zero bits to get the proper DER
encoding. (By default, crypto/asn1/a_bitstr.c assumes the case
of a NamedBitList, for which trailing 0 bits need to be removed.)
[Bodo Moeller]
*) Have SSL/TLS server implementation tolerate "mismatched" record
protocol version while receiving ClientHello even if the
ClientHello is fragmented. (The server can't insist on the
particular protocol version it has chosen before the ServerHello
message has informed the client about his choice.)
[Bodo Moeller]
*) Add RFC 3779 support.
[Rob Austein for ARIN, Ben Laurie]
*) Load error codes if they are not already present instead of using a
static variable. This allows them to be cleanly unloaded and reloaded.
Improve header file function name parsing.
[Steve Henson]
*) extend SMTP and IMAP protocol emulation in s_client to use EHLO
or CAPABILITY handshake as required by RFCs.
[Goetz Babin-Ebell]
Changes between 0.9.8c and 0.9.8d [28 Sep 2006]
*) Introduce limits to prevent malicious keys being able to
cause a denial of service. (CVE-2006-2940)
[Steve Henson, Bodo Moeller]
*) Fix ASN.1 parsing of certain invalid structures that can result
in a denial of service. (CVE-2006-2937) [Steve Henson]
*) Fix buffer overflow in SSL_get_shared_ciphers() function.
(CVE-2006-3738) [Tavis Ormandy and Will Drewry, Google Security Team]
*) Fix SSL client code which could crash if connecting to a
malicious SSLv2 server. (CVE-2006-4343)
[Tavis Ormandy and Will Drewry, Google Security Team]
*) Since 0.9.8b, ciphersuite strings naming explicit ciphersuites
match only those. Before that, "AES256-SHA" would be interpreted
as a pattern and match "AES128-SHA" too (since AES128-SHA got
the same strength classification in 0.9.7h) as we currently only
have a single AES bit in the ciphersuite description bitmap.
That change, however, also applied to ciphersuite strings such as
"RC4-MD5" that intentionally matched multiple ciphersuites --
namely, SSL 2.0 ciphersuites in addition to the more common ones
from SSL 3.0/TLS 1.0.
So we change the selection algorithm again: Naming an explicit
ciphersuite selects this one ciphersuite, and any other similar
ciphersuite (same bitmap) from *other* protocol versions.
Thus, "RC4-MD5" again will properly select both the SSL 2.0
ciphersuite and the SSL 3.0/TLS 1.0 ciphersuite.
Since SSL 2.0 does not have any ciphersuites for which the
128/256 bit distinction would be relevant, this works for now.
The proper fix will be to use different bits for AES128 and
AES256, which would have avoided the problems from the beginning;
however, bits are scarce, so we can only do this in a new release
(not just a patchlevel) when we can change the SSL_CIPHER
definition to split the single 'unsigned long mask' bitmap into
multiple values to extend the available space.
[Bodo Moeller]
Changes between 0.9.8b and 0.9.8c [05 Sep 2006]
*) Avoid PKCS #1 v1.5 signature attack discovered by Daniel Bleichenbacher
(CVE-2006-4339) [Ben Laurie and Google Security Team]
*) Add AES IGE and biIGE modes.
[Ben Laurie]
*) Change the Unix randomness entropy gathering to use poll() when
possible instead of select(), since the latter has some
undesirable limitations.
[Darryl Miles via Richard Levitte and Bodo Moeller]
*) Disable "ECCdraft" ciphersuites more thoroughly. Now special
treatment in ssl/ssl_ciph.s makes sure that these ciphersuites
cannot be implicitly activated as part of, e.g., the "AES" alias.
However, please upgrade to OpenSSL 0.9.9[-dev] for
non-experimental use of the ECC ciphersuites to get TLS extension
support, which is required for curve and point format negotiation
to avoid potential handshake problems.
[Bodo Moeller]
*) Disable rogue ciphersuites:
- SSLv2 0x08 0x00 0x80 ("RC4-64-MD5")
- SSLv3/TLSv1 0x00 0x61 ("EXP1024-RC2-CBC-MD5")
- SSLv3/TLSv1 0x00 0x60 ("EXP1024-RC4-MD5")
The latter two were purportedly from
draft-ietf-tls-56-bit-ciphersuites-0[01].txt, but do not really
appear there.
Also deactivate the remaining ciphersuites from
draft-ietf-tls-56-bit-ciphersuites-01.txt. These are just as
unofficial, and the ID has long expired.
[Bodo Moeller]
*) Fix RSA blinding Heisenbug (problems sometimes occured on
dual-core machines) and other potential thread-safety issues.
[Bodo Moeller]
*) Add the symmetric cipher Camellia (128-bit, 192-bit, 256-bit key
versions), which is now available for royalty-free use
Also, add Camellia TLS ciphersuites from RFC 4132.
To minimize changes between patchlevels in the OpenSSL 0.9.8
series, Camellia remains excluded from compilation unless OpenSSL
is configured with 'enable-camellia'.
*) Disable the padding bug check when compression is in use. The padding
bug check assumes the first packet is of even length, this is not
necessarily true if compresssion is enabled and can result in false
positives causing handshake failure. The actual bug test is ancient
code so it is hoped that implementations will either have fixed it by
now or any which still have the bug do not support compression.
[Steve Henson]
Changes between 0.9.8a and 0.9.8b [04 May 2006]
*) When applying a cipher rule check to see if string match is an explicit
cipher suite and only match that one cipher suite if it is.
[Steve Henson]
*) Link in manifests for VC++ if needed.
[Austin Ziegler <>]
*) Update support for ECC-based TLS ciphersuites according to
draft-ietf-tls-ecc-12.txt with proposed changes (but without
TLS extensions, which are supported starting with the 0.9.9
branch, not in the OpenSSL 0.9.8 branch).
[Douglas Stebila]
*) New functions EVP_CIPHER_CTX_new() and EVP_CIPHER_CTX_free() to support
opaque EVP_CIPHER_CTX handling.
[Steve Henson]
*) Fixes and enhancements to zlib compression code. We now only use
"zlib1.dll" and use the default __cdecl calling convention on Win32
to conform with the standards mentioned here:
Static zlib linking now works on Windows and the new --with-zlib-include
--with-zlib-lib options to Configure can be used to supply the location
of the headers and library. Gracefully handle case where zlib library
can't be loaded.
[Steve Henson]
*) Several fixes and enhancements to the OID generation code. The old code
sometimes allowed invalid OIDs (1.X for X >= 40 for example), couldn't
handle numbers larger than ULONG_MAX, truncated printing and had a
non standard OBJ_obj2txt() behaviour.
[Steve Henson]
*) Add support for building of engines under engine/ as shared libraries
under VC++ build system.
[Steve Henson]
*) Corrected the numerous bugs in the Win32 path splitter in DSO.
Hopefully, we will not see any false combination of paths any more.
[Richard Levitte]
Changes between 0.9.8 and 0.9.8a [11 Oct 2005]
*) Remove the functionality of SSL_OP_MSIE_SSLV2_RSA_PADDING
(part of SSL_OP_ALL). This option used to disable the
countermeasure against man-in-the-middle protocol-version
rollback in the SSL 2.0 server implementation, which is a bad
idea. (CVE-2005-2969)
[Bodo Moeller; problem pointed out by Yutaka Oiwa (Research Center
for Information Security, National Institute of Advanced Industrial
Science and Technology [AIST], Japan)]
*) Add two function to clear and return the verify parameter flags.
[Steve Henson]
*) Keep cipherlists sorted in the source instead of sorting them at
runtime, thus removing the need for a lock.
[Nils Larsch]
*) Avoid some small subgroup attacks in Diffie-Hellman.
[Nick Mathewson and Ben Laurie]
*) Add functions for well-known primes.
[Nick Mathewson]
*) Extended Windows CE support.
[Satoshi Nakamura and Andy Polyakov]
*) Initialize SSL_METHOD structures at compile time instead of during
runtime, thus removing the need for a lock.
[Steve Henson]
*) Make PKCS7_decrypt() work even if no certificate is supplied by
attempting to decrypt each encrypted key in turn. Add support to
smime utility.
[Steve Henson]
Changes between 0.9.7h and 0.9.8 [05 Jul 2005]
[NB: OpenSSL 0.9.7i and later 0.9.7 patch levels were released after
OpenSSL 0.9.8.]
*) Add libcrypto.pc and libssl.pc for those who feel they need them.
[Richard Levitte]
*) Change and so they don't bundle the CSR and the private
key into the same file any more.
[Richard Levitte]
*) Add initial support for Win64, both IA64 and AMD64/x64 flavors.
[Andy Polyakov]
*) Add -utf8 command line and config file option to 'ca'.
[Stefan <]
*) Removed the macro des_crypt(), as it seems to conflict with some
libraries. Use DES_crypt().
[Richard Levitte]
*) Correct naming of the 'chil' and '4758cca' ENGINEs. This
involves renaming the source and generated shared-libs for
both. The engines will accept the corrected or legacy ids
('ncipher' and '4758_cca' respectively) when binding. NB,
this only applies when building 'shared'.
[Corinna Vinschen <> and Geoff Thorpe]
*) Add attribute functions to EVP_PKEY structure. Modify
PKCS12_create() to recognize a CSP name attribute and
use it. Make -CSP option work again in pkcs12 utility.
[Steve Henson]
*) Add new functionality to the bn blinding code:
- automatic re-creation of the BN_BLINDING parameters after
a fixed number of uses (currently 32)
- add new function for parameter creation
- introduce flags to control the update behaviour of the
BN_BLINDING parameters
- hide BN_BLINDING structure
Add a second BN_BLINDING slot to the RSA structure to improve
performance when a single RSA object is shared among several
[Nils Larsch]
*) Add support for DTLS.
[Nagendra Modadugu <> and Ben Laurie]
*) Add support for DER encoded private keys (SSL_FILETYPE_ASN1)
to SSL_CTX_use_PrivateKey_file() and SSL_use_PrivateKey_file()
[Walter Goulet]
*) Remove buggy and incompletet DH cert support from
ssl/ssl_rsa.c and ssl/s3_both.c
[Nils Larsch]
*) Use SHA-1 instead of MD5 as the default digest algorithm for
the apps/openssl applications.
[Nils Larsch]
*) Compile clean with "-Wall -Wmissing-prototypes
-Wstrict-prototypes -Wmissing-declarations -Werror". Currently
DEBUG_SAFESTACK must also be set.
[Ben Laurie]
*) Change ./Configure so that certain algorithms can be disabled by default.
The new counterpiece to "no-xxx" is "enable-xxx".
The patented RC5 and MDC2 algorithms will now be disabled unless
"enable-rc5" and "enable-mdc2", respectively, are specified.
(IDEA remains enabled despite being patented. This is because IDEA
is frequently required for interoperability, and there is no license
fee for non-commercial use. As before, "no-idea" can be used to
avoid this algorithm.)
[Bodo Moeller]
*) Add processing of proxy certificates (see RFC 3820). This work was
sponsored by KTH (The Royal Institute of Technology in Stockholm) and
EGEE (Enabling Grids for E-science in Europe).
[Richard Levitte]
*) RC4 performance overhaul on modern architectures/implementations, such
as Intel P4, IA-64 and AMD64.
[Andy Polyakov]
*) New utility This can be used specify an alternative
section number in a pod file instead of having to treat each file as
a separate case in Makefile. This can be done by adding two lines to the
pod file:
=for comment openssl_section:XXX
The blank line is mandatory.
[Steve Henson]
*) New arguments -certform, -keyform and -pass for s_client and s_server
to allow alternative format key and certificate files and passphrase
[Steve Henson]
*) New structure X509_VERIFY_PARAM which combines current verify parameters,
update associated structures and add various utility functions.
Add new policy related verify parameters, include policy checking in
standard verify code. Enhance 'smime' application with extra parameters
to support policy checking and print out.
[Steve Henson]
*) Add a new engine to support VIA PadLock ACE extensions in the VIA C3
Nehemiah processors. These extensions support AES encryption in hardware
as well as RNG (though RNG support is currently disabled).
[Michal Ludvig <>, with help from Andy Polyakov]
*) Deprecate BN_[get|set]_params() functions (they were ignored internally).
[Geoff Thorpe]
*) New FIPS 180-2 algorithms, SHA-224/-256/-384/-512 are implemented.
[Andy Polyakov and a number of other people]
*) Improved PowerPC platform support. Most notably BIGNUM assembler
implementation contributed by IBM.
[Suresh Chari, Peter Waltenberg, Andy Polyakov]
*) The new 'RSA_generate_key_ex' function now takes a BIGNUM for the public
exponent rather than 'unsigned long'. There is a corresponding change to
the new 'rsa_keygen' element of the RSA_METHOD structure.
[Jelte Jansen, Geoff Thorpe]
*) Functionality for creating the initial serial number file is now
moved from to the 'ca' utility with a new option -create_serial.
(Before OpenSSL 0.9.7e, used to initialize the serial
number file to 1, which is bound to cause problems. To avoid
the problems while respecting compatibility between different 0.9.7
patchlevels, 0.9.7e employed 'openssl x509 -next_serial' in for serial number initialization. With the new release 0.9.8,
we can fix the problem directly in the 'ca' utility.)
[Steve Henson]
*) Reduced header interdepencies by declaring more opaque objects in
ossl_typ.h. As a consequence, including some headers (eg. engine.h) will
give fewer recursive includes, which could break lazy source code - so
this change is covered by the OPENSSL_NO_DEPRECATED symbol. As always,
developers should define this symbol when building and using openssl to
ensure they track the recommended behaviour, interfaces, [etc], but
backwards-compatible behaviour prevails when this isn't defined.
[Geoff Thorpe]
*) New function X509_POLICY_NODE_print() which prints out policy nodes.
[Steve Henson]
*) Add new EVP function EVP_CIPHER_CTX_rand_key and associated functionality.
This will generate a random key of the appropriate length based on the
cipher context. The EVP_CIPHER can provide its own random key generation
routine to support keys of a specific form. This is used in the des and
3des routines to generate a key of the correct parity. Update S/MIME
code to use new functions and hence generate correct parity DES keys.
Add EVP_CHECK_DES_KEY #define to return an error if the key is not
valid (weak or incorrect parity).
[Steve Henson]
*) Add a local set of CRLs that can be used by X509_verify_cert() as well
as looking them up. This is useful when the verified structure may contain
CRLs, for example PKCS#7 signedData. Modify PKCS7_verify() to use any CRLs
present unless the new PKCS7_NO_CRL flag is asserted.
[Steve Henson]
*) Extend ASN1 oid configuration module. It now additionally accepts the
shortName = some long name,
[Steve Henson]
*) Reimplemented the BN_CTX implementation. There is now no more static
limitation on the number of variables it can handle nor the depth of the
"stack" handling for BN_CTX_start()/BN_CTX_end() pairs. The stack
information can now expand as required, and rather than having a single
static array of bignums, BN_CTX now uses a linked-list of such arrays
allowing it to expand on demand whilst maintaining the usefulness of
BN_CTX's "bundling".
[Geoff Thorpe]
*) Add a missing BN_CTX parameter to the 'rsa_mod_exp' callback in RSA_METHOD
to allow all RSA operations to function using a single BN_CTX.
[Geoff Thorpe]
*) Preliminary support for certificate policy evaluation and checking. This
is initially intended to pass the tests outlined in "Conformance Testing
of Relying Party Client Certificate Path Processing Logic" v1.07.
[Steve Henson]
*) bn_dup_expand() has been deprecated, it was introduced in 0.9.7 and
remained unused and not that useful. A variety of other little bignum
tweaks and fixes have also been made continuing on from the audit (see
[Geoff Thorpe]
*) Constify all or almost all d2i, c2i, s2i and r2i functions, along with
associated ASN1, EVP and SSL functions and old ASN1 macros.
[Richard Levitte]
*) BN_zero() only needs to set 'top' and 'neg' to zero for correct results,
and this should never fail. So the return value from the use of
BN_set_word() (which can fail due to needless expansion) is now deprecated;
if OPENSSL_NO_DEPRECATED is defined, BN_zero() is a void macro.
[Geoff Thorpe]
*) BN_CTX_get() should return zero-valued bignums, providing the same
initialised value as BN_new().
[Geoff Thorpe, suggested by Ulf Möller]
*) Support for inhibitAnyPolicy certificate extension.
[Steve Henson]
*) An audit of the BIGNUM code is underway, for which debugging code is
enabled when BN_DEBUG is defined. This makes stricter enforcements on what
is considered valid when processing BIGNUMs, and causes execution to
assert() when a problem is discovered. If BN_DEBUG_RAND is defined,
further steps are taken to deliberately pollute unused data in BIGNUM
structures to try and expose faulty code further on. For now, openssl will
(in its default mode of operation) continue to tolerate the inconsistent
forms that it has tolerated in the past, but authors and packagers should
consider trying openssl and their own applications when compiled with
these debugging symbols defined. It will help highlight potential bugs in
their own code, and will improve the test coverage for OpenSSL itself. At
some point, these tighter rules will become openssl's default to improve
maintainability, though the assert()s and other overheads will remain only
in debugging configurations. See bn.h for more details.
[Geoff Thorpe, Nils Larsch, Ulf Möller]
*) BN_CTX_init() has been deprecated, as BN_CTX is an opaque structure
that can only be obtained through BN_CTX_new() (which implicitly
initialises it). The presence of this function only made it possible
to overwrite an existing structure (and cause memory leaks).
[Geoff Thorpe]
*) Because of the callback-based approach for implementing LHASH as a
template type, lh_insert() adds opaque objects to hash-tables and
lh_doall() or lh_doall_arg() are typically used with a destructor callback
to clean up those corresponding objects before destroying the hash table
(and losing the object pointers). So some over-zealous constifications in
LHASH have been relaxed so that lh_insert() does not take (nor store) the
objects as "const" and the lh_doall[_arg] callback wrappers are not
prototyped to have "const" restrictions on the object pointers they are
given (and so aren't required to cast them away any more).
[Geoff Thorpe]
*) The tmdiff.h API was so ugly and minimal that our own timing utility
(speed) prefers to use its own implementation. The two implementations
haven't been consolidated as yet (volunteers?) but the tmdiff API has had
its object type properly exposed (MS_TM) instead of casting to/from "char
*". This may still change yet if someone realises MS_TM and "ms_time_***"
aren't necessarily the greatest nomenclatures - but this is what was used
internally to the implementation so I've used that for now.
[Geoff Thorpe]
*) Ensure that deprecated functions do not get compiled when
OPENSSL_NO_DEPRECATED is defined. Some "openssl" subcommands and a few of
the self-tests were still using deprecated key-generation functions so
these have been updated also.
[Geoff Thorpe]
*) Reorganise PKCS#7 code to separate the digest location functionality
into PKCS7_find_digest(), digest addtion into PKCS7_bio_add_digest().
New function PKCS7_set_digest() to set the digest type for PKCS#7
digestedData type. Add additional code to correctly generate the
digestedData type and add support for this type in PKCS7 initialization
[Steve Henson]
*) New function PKCS7_set0_type_other() this initializes a PKCS7
structure of type "other".
[Steve Henson]
*) Fix prime generation loop in crypto/bn/ by making
sure the loop does correctly stop and breaking ("division by zero")
modulus operations are not performed. The (pre-generated) prime
table crypto/bn/bn_prime.h was already correct, but it could not be
re-generated on some platforms because of the "division by zero"
situation in the script.
[Ralf S. Engelschall]
*) Update support for ECC-based TLS ciphersuites according to
draft-ietf-tls-ecc-03.txt: the KDF1 key derivation function with
SHA-1 now is only used for "small" curves (where the
representation of a field element takes up to 24 bytes); for
larger curves, the field element resulting from ECDH is directly
used as premaster secret.
[Douglas Stebila (Sun Microsystems Laboratories)]
*) Add code for kP+lQ timings to crypto/ec/ectest.c, and add SEC2
curve secp160r1 to the tests.
[Douglas Stebila (Sun Microsystems Laboratories)]
*) Add the possibility to load symbols globally with DSO.
[Götz Babin-Ebell <> via Richard Levitte]
*) Add the functions ERR_set_mark() and ERR_pop_to_mark() for better
control of the error stack.
[Richard Levitte]
*) Add support for STORE in ENGINE.
[Richard Levitte]
*) Add the STORE type. The intention is to provide a common interface
to certificate and key stores, be they simple file-based stores, or
HSM-type store, or LDAP stores, or...
NOTE: The code is currently UNTESTED and isn't really used anywhere.
[Richard Levitte]
*) Add a generic structure called OPENSSL_ITEM. This can be used to
pass a list of arguments to any function as well as provide a way
for a function to pass data back to the caller.
[Richard Levitte]
*) Add the functions BUF_strndup() and BUF_memdup(). BUF_strndup()
works like BUF_strdup() but can be used to duplicate a portion of
a string. The copy gets NUL-terminated. BUF_memdup() duplicates
a memory area.
[Richard Levitte]
*) Add the function sk_find_ex() which works like sk_find(), but will
return an index to an element even if an exact match couldn't be
found. The index is guaranteed to point at the element where the
searched-for key would be inserted to preserve sorting order.
[Richard Levitte]
*) Add the function OBJ_bsearch_ex() which works like OBJ_bsearch() but
takes an extra flags argument for optional functionality. Currently,
the following flags are defined:
This one gets OBJ_bsearch_ex() to return a pointer to the first
element where the comparing function returns a negative or zero
This one gets OBJ_bsearch_ex() to return a pointer to the first
element where the comparing function returns zero. This is useful
if there are more than one element where the comparing function
returns zero.
[Richard Levitte]
*) Make it possible to create self-signed certificates with 'openssl ca'
in such a way that the self-signed certificate becomes part of the
CA database and uses the same mechanisms for serial number generation
as all other certificate signing. The new flag '-selfsign' enables
this functionality. Adapt and
[Richard Levitte]
*) Add functionality to check the public key of a certificate request
against a given private. This is useful to check that a certificate
request can be signed by that key (self-signing).
[Richard Levitte]
*) Make it possible to have multiple active certificates with the same
subject in the CA index file. This is done only if the keyword
'unique_subject' is set to 'no' in the main CA section (default
if 'CA_default') of the configuration file. The value is saved
with the database itself in a separate index attribute file,
named like the index file with '.attr' appended to the name.
[Richard Levitte]
*) Generate muti valued AVAs using '+' notation in config files for
req and dirName.
[Steve Henson]
*) Support for nameConstraints certificate extension.
[Steve Henson]
*) Support for policyConstraints certificate extension.
[Steve Henson]
*) Support for policyMappings certificate extension.
[Steve Henson]
*) Make sure the default DSA_METHOD implementation only uses its
dsa_mod_exp() and/or bn_mod_exp() handlers if they are non-NULL,
and change its own handlers to be NULL so as to remove unnecessary
indirection. This lets alternative implementations fallback to the
default implementation more easily.
[Geoff Thorpe]
*) Support for directoryName in GeneralName related extensions
in config files.
[Steve Henson]
*) Make it possible to link applications using Makefile.shared.
Make that possible even when linking against static libraries!
[Richard Levitte]
*) Support for single pass processing for S/MIME signing. This now
means that S/MIME signing can be done from a pipe, in addition
cleartext signing (multipart/signed type) is effectively streaming
and the signed data does not need to be all held in memory.
This is done with a new flag PKCS7_STREAM. When this flag is set
PKCS7_sign() only initializes the PKCS7 structure and the actual signing
is done after the data is output (and digests calculated) in
[Steve Henson]
*) Add full support for -rpath/-R, both in shared libraries and
applications, at least on the platforms where it's known how
to do it.
[Richard Levitte]
*) In crypto/ec/ec_mult.c, implement fast point multiplication with
precomputation, based on wNAF splitting: EC_GROUP_precompute_mult()
will now compute a table of multiples of the generator that
makes subsequent invocations of EC_POINTs_mul() or EC_POINT_mul()
faster (notably in the case of a single point multiplication,
scalar * generator).
[Nils Larsch, Bodo Moeller]
*) IPv6 support for certificate extensions. The various extensions
which use the IP:a.b.c.d can now take IPv6 addresses using the
formats of RFC1884 2.2 . IPv6 addresses are now also displayed
[Steve Henson]
*) Added an ENGINE that implements RSA by performing private key
exponentiations with the GMP library. The conversions to and from
GMP's mpz_t format aren't optimised nor are any montgomery forms
cached, and on x86 it appears OpenSSL's own performance has caught up.
However there are likely to be other architectures where GMP could
provide a boost. This ENGINE is not built in by default, but it can be
specified at Configure time and should be accompanied by the necessary
linker additions, eg;
./config -DOPENSSL_USE_GMP -lgmp
[Geoff Thorpe]
*) "openssl engine" will not display ENGINE/DSO load failure errors when
testing availability of engines with "-t" - the old behaviour is
produced by increasing the feature's verbosity with "-tt".
[Geoff Thorpe]
*) ECDSA routines: under certain error conditions uninitialized BN objects
could be freed. Solution: make sure initialization is performed early
enough. (Reported and fix supplied by Nils Larsch <>
via PR#459)
[Lutz Jaenicke]
*) Key-generation can now be implemented in RSA_METHOD, DSA_METHOD
and DH_METHOD (eg. by ENGINE implementations) to override the normal
software implementations. For DSA and DH, parameter generation can
also be overriden by providing the appropriate method callbacks.
[Geoff Thorpe]
*) Change the "progress" mechanism used in key-generation and
primality testing to functions that take a new BN_GENCB pointer in
place of callback/argument pairs. The new API functions have "_ex"
postfixes and the older functions are reimplemented as wrappers for
the new ones. The OPENSSL_NO_DEPRECATED symbol can be used to hide
declarations of the old functions to help (graceful) attempts to
migrate to the new functions. Also, the new key-generation API
functions operate on a caller-supplied key-structure and return
success/failure rather than returning a key or NULL - this is to
help make "keygen" another member function of RSA_METHOD etc.
Example for using the new callback interface:
int (*my_callback)(int a, int b, BN_GENCB *cb) = ...;
void *my_arg = ...;
BN_GENCB my_cb;
BN_GENCB_set(&my_cb, my_callback, my_arg);
return BN_is_prime_ex(some_bignum, BN_prime_checks, NULL, &cb);
/* For the meaning of a, b in calls to my_callback(), see the
* documentation of the function that calls the callback.
* cb will point to my_cb; my_arg can be retrieved as cb->arg.
* my_callback should return 1 if it wants BN_is_prime_ex()
* to continue, or 0 to stop.
[Geoff Thorpe]
*) Change the ZLIB compression method to be stateful, and make it
available to TLS with the number defined in
[Richard Levitte]
*) Add the ASN.1 structures and functions for CertificatePair, which
is defined as follows (according to X.509_4thEditionDraftV6.pdf):
CertificatePair ::= SEQUENCE {
forward [0] Certificate OPTIONAL,
reverse [1] Certificate OPTIONAL,
-- at least one of the pair shall be present -- }
Also implement the PEM functions to read and write certificate
pairs, and defined the PEM tag as "CERTIFICATE PAIR".
This needed to be defined, mostly for the sake of the LDAP
attribute crossCertificatePair, but may prove useful elsewhere as
[Richard Levitte]
*) Make it possible to inhibit symlinking of shared libraries in
Makefile.shared, for Cygwin's sake.
[Richard Levitte]
*) Extend the BIGNUM API by creating a function
void BN_set_negative(BIGNUM *a, int neg);
and a macro that behave like
int BN_is_negative(const BIGNUM *a);
to avoid the need to access 'a->neg' directly in applications.
[Nils Larsch]
*) Implement fast modular reduction for pseudo-Mersenne primes
used in NIST curves (crypto/bn/bn_nist.c, crypto/ec/ecp_nist.c).
EC_GROUP_new_curve_GFp() will now automatically use this
if applicable.
[Nils Larsch <>]
*) Add new lock type (CRYPTO_LOCK_BN).
[Bodo Moeller]
*) Change the ENGINE framework to automatically load engines
dynamically from specific directories unless they could be
found to already be built in or loaded. Move all the
current engines except for the cryptodev one to a new
directory engines/.
The engines in engines/ are built as shared libraries if
the "shared" options was given to ./Configure or ./config.
Otherwise, they are inserted in libcrypto.a.
/usr/local/ssl/engines is the default directory for dynamic
engines, but that can be overriden at configure time through
the usual use of --prefix and/or --openssldir, and at run
time with the environment variable OPENSSL_ENGINES.
[Geoff Thorpe and Richard Levitte]
*) Add Makefile.shared, a helper makefile to build shared
libraries. Addapt
[Richard Levitte]
*) Add version info to Win32 DLLs.
[Peter 'Luna' Runestig" <>]
*) Add new 'medium level' PKCS#12 API. Certificates and keys
can be added using this API to created arbitrary PKCS#12
files while avoiding the low level API.
New options to PKCS12_create(), key or cert can be NULL and
will then be omitted from the output file. The encryption
algorithm NIDs can be set to -1 for no encryption, the mac
iteration count can be set to 0 to omit the mac.
Enhance pkcs12 utility by making the -nokeys and -nocerts
options work when creating a PKCS#12 file. New option -nomac
to omit the mac, NONE can be set for an encryption algorithm.
New code is modified to use the enhanced PKCS12_create()
instead of the low level API.
[Steve Henson]
*) Extend ASN1 encoder to support indefinite length constructed
encoding. This can output sequences tags and octet strings in
this form. Modify pk7_asn1.c to support indefinite length
encoding. This is experimental and needs additional code to
be useful, such as an ASN1 bio and some enhanced streaming
PKCS#7 code.
Extend template encode functionality so that tagging is passed
down to the template encoder.
[Steve Henson]
*) Let 'openssl req' fail if an argument to '-newkey' is not
recognized instead of using RSA as a default.
[Bodo Moeller]
*) Add support for ECC-based ciphersuites from draft-ietf-tls-ecc-01.txt.
As these are not official, they are not included in "ALL";
the "ECCdraft" ciphersuite group alias can be used to select them.
[Vipul Gupta and Sumit Gupta (Sun Microsystems Laboratories)]
*) Add ECDH engine support.
[Nils Gura and Douglas Stebila (Sun Microsystems Laboratories)]
*) Add ECDH in new directory crypto/ecdh/.
[Douglas Stebila (Sun Microsystems Laboratories)]
*) Let BN_rand_range() abort with an error after 100 iterations
without success (which indicates a broken PRNG).
[Bodo Moeller]
*) Change BN_mod_sqrt() so that it verifies that the input value
is really the square of the return value. (Previously,
BN_mod_sqrt would show GIGO behaviour.)
[Bodo Moeller]
*) Add named elliptic curves over binary fields from X9.62, SECG,
and WAP/WTLS; add OIDs that were still missing.
[Sheueling Chang Shantz and Douglas Stebila
(Sun Microsystems Laboratories)]
*) Extend the EC library for elliptic curves over binary fields
(new files ec2_smpl.c, ec2_smpt.c, ec2_mult.c in crypto/ec/).
New API functions:
Point compression for binary fields is disabled by default for
patent reasons (compile with OPENSSL_EC_BIN_PT_COMP defined to
enable it).
As binary polynomials are represented as BIGNUMs, various members
of the EC_GROUP and EC_POINT data structures can be shared
between the implementations for prime fields and binary fields;
the above ..._GF2m functions (except for EX_GROUP_new_curve_GF2m)
are essentially identical to their ..._GFp counterparts.
(For simplicity, the '..._GFp' prefix has been dropped from
various internal method names.)
An internal 'field_div' method (similar to 'field_mul' and
'field_sqr') has been added; this is used only for binary fields.
[Sheueling Chang Shantz and Douglas Stebila
(Sun Microsystems Laboratories)]
*) Optionally dispatch EC_POINT_mul(), EC_POINT_precompute_mult()
through methods ('mul', 'precompute_mult').
The generic implementations (now internally called 'ec_wNAF_mul'
and 'ec_wNAF_precomputed_mult') remain the default if these
methods are undefined.
[Sheueling Chang Shantz and Douglas Stebila
(Sun Microsystems Laboratories)]
*) New function EC_GROUP_get_degree, which is defined through
EC_METHOD. For curves over prime fields, this returns the bit
length of the modulus.
[Sheueling Chang Shantz and Douglas Stebila
(Sun Microsystems Laboratories)]
*) New functions EC_GROUP_dup, EC_POINT_dup.
(These simply call ..._new and ..._copy).
[Sheueling Chang Shantz and Douglas Stebila
(Sun Microsystems Laboratories)]
*) Add binary polynomial arithmetic software in crypto/bn/bn_gf2m.c.
Polynomials are represented as BIGNUMs (where the sign bit is not
used) in the following functions [macros]:
BN_GF2m_sub [= BN_GF2m_add]
BN_GF2m_mod [wrapper for BN_GF2m_mod_arr]
BN_GF2m_mod_mul [wrapper for BN_GF2m_mod_mul_arr]
BN_GF2m_mod_sqr [wrapper for BN_GF2m_mod_sqr_arr]
BN_GF2m_mod_exp [wrapper for BN_GF2m_mod_exp_arr]
BN_GF2m_mod_sqrt [wrapper for BN_GF2m_mod_sqrt_arr]
BN_GF2m_mod_solve_quad [wrapper for BN_GF2m_mod_solve_quad_arr]
BN_GF2m_cmp [= BN_ucmp]
(Note that only the 'mod' functions are actually for fields GF(2^m).
BN_GF2m_add() is misnomer, but this is for the sake of consistency.)
For some functions, an the irreducible polynomial defining a
field can be given as an 'unsigned int[]' with strictly
decreasing elements giving the indices of those bits that are set;
i.e., p[] represents the polynomial
f(t) = t^p[0] + t^p[1] + ... + t^p[k]
p[0] > p[1] > ... > p[k] = 0.
This applies to the following functions:
BN_GF2m_mod_inv_arr [wrapper for BN_GF2m_mod_inv]
BN_GF2m_mod_div_arr [wrapper for BN_GF2m_mod_div]
Conversion can be performed by the following functions:
bntest.c has additional tests for binary polynomial arithmetic.
Two implementations for BN_GF2m_mod_div() are available.
The default algorithm simply uses BN_GF2m_mod_inv() and
BN_GF2m_mod_mul(). The alternative algorithm is compiled in only
if OPENSSL_SUN_GF2M_DIV is defined (patent pending; read the
copyright notice in crypto/bn/bn_gf2m.c before enabling it).
[Sheueling Chang Shantz and Douglas Stebila
(Sun Microsystems Laboratories)]
*) Add new error code 'ERR_R_DISABLED' that can be used when some
functionality is disabled at compile-time.
[Douglas Stebila <>]
*) Change default behaviour of 'openssl asn1parse' so that more
information is visible when viewing, e.g., a certificate:
Modify asn1_parse2 (crypto/asn1/asn1_par.c) so that in non-'dump'
mode the content of non-printable OCTET STRINGs is output in a
style similar to INTEGERs, but with '[HEX DUMP]' prepended to
avoid the appearance of a printable string.
[Nils Larsch <>]
*) Add 'asn1_flag' and 'asn1_form' member to EC_GROUP with access
These control ASN1 encoding details:
- Curves (i.e., groups) are encoded explicitly unless asn1_flag
has been set to OPENSSL_EC_NAMED_CURVE.
- Points are encoded in uncompressed form by default; options for
asn1_for are as for point2oct, namely
Also add 'seed' and 'seed_len' members to EC_GROUP with access
This is used only for ASN1 purposes (so far).
[Nils Larsch <>]
*) Add 'field_type' member to EC_METHOD, which holds the NID
of the appropriate field type OID. The new function
EC_METHOD_get_field_type() returns this value.
[Nils Larsch <>]
*) Add functions
providing useful interfaces to EC_POINT_point2oct() and
[Nils Larsch <>]
*) Change internals of the EC library so that the functions
are implemented directly in crypto/ec/ec_lib.c and not dispatched
to methods, which would lead to unnecessary code duplication when
adding different types of curves.
[Nils Larsch <> with input by Bodo Moeller]
*) Implement compute_wNAF (crypto/ec/ec_mult.c) without BIGNUM
arithmetic, and such that modified wNAFs are generated
(which avoid length expansion in many cases).
[Bodo Moeller]
*) Add a function EC_GROUP_check_discriminant() (defined via
EC_METHOD) that verifies that the curve discriminant is non-zero.
Add a function EC_GROUP_check() that makes some sanity tests
on a EC_GROUP, its generator and order. This includes
[Nils Larsch <>]
*) Add ECDSA in new directory crypto/ecdsa/.
Add applications 'openssl ecparam' and 'openssl ecdsa'
(these are based on 'openssl dsaparam' and 'openssl dsa').
ECDSA support is also included in various other files across the
library. Most notably,
- 'openssl req' now has a '-newkey ecdsa:file' option;
- EVP_PKCS82PKEY (crypto/evp/evp_pkey.c) now can handle ECDSA;
- X509_PUBKEY_get (crypto/asn1/x_pubkey.c) and
d2i_PublicKey (crypto/asn1/d2i_pu.c) have been modified to make
them suitable for ECDSA where domain parameters must be
extracted before the specific public key;
- ECDSA engine support has been added.
[Nils Larsch <>]
*) Include some named elliptic curves, and add OIDs from X9.62,
SECG, and WAP/WTLS. Each curve can be obtained from the new
and the list of available named curves can be obtained with
Also add a 'curve_name' member to EC_GROUP objects, which can be
accessed via
[Nils Larsch <, Bodo Moeller]
*) Remove a few calls to bn_wexpand() in BN_sqr() (the one in there
was actually never needed) and in BN_mul(). The removal in BN_mul()
required a small change in bn_mul_part_recursive() and the addition
of the functions bn_cmp_part_words(), bn_sub_part_words() and
bn_add_part_words(), which do the same thing as bn_cmp_words(),
bn_sub_words() and bn_add_words() except they take arrays with
differing sizes.
[Richard Levitte]
Changes between 0.9.7l and 0.9.7m [23 Feb 2007]
*) Cleanse PEM buffers before freeing them since they may contain
sensitive data.
[Benjamin Bennett <>]
*) Include "!eNULL" in SSL_DEFAULT_CIPHER_LIST to make sure that
a ciphersuite string such as "DEFAULT:RSA" cannot enable
authentication-only ciphersuites.
[Bodo Moeller]
*) Since AES128 and AES256 share a single mask bit in the logic of
ssl/ssl_ciph.c, the code for masking out disabled ciphers needs a
kludge to work properly if AES128 is available and AES256 isn't.
[Victor Duchovni]
*) Expand security boundary to match 1.1.1 module.
[Steve Henson]
*) Remove redundant features: hash file source, editing of test vectors
modify fipsld to use external fips_premain.c signature.
[Steve Henson]
*) New perl script to create shell scripts or batch files to
run algorithm test programs.
[Steve Henson]
*) Make algorithm test programs more tolerant of whitespace.
[Steve Henson]
*) Have SSL/TLS server implementation tolerate "mismatched" record
protocol version while receiving ClientHello even if the
ClientHello is fragmented. (The server can't insist on the
particular protocol version it has chosen before the ServerHello
message has informed the client about his choice.)
[Bodo Moeller]
*) Load error codes if they are not already present instead of using a
static variable. This allows them to be cleanly unloaded and reloaded.
[Steve Henson]
Changes between 0.9.7k and 0.9.7l [28 Sep 2006]
*) Introduce limits to prevent malicious keys being able to
cause a denial of service. (CVE-2006-2940)
[Steve Henson, Bodo Moeller]
*) Fix ASN.1 parsing of certain invalid structures that can result
in a denial of service. (CVE-2006-2937) [Steve Henson]
*) Fix buffer overflow in SSL_get_shared_ciphers() function.
(CVE-2006-3738) [Tavis Ormandy and Will Drewry, Google Security Team]
*) Fix SSL client code which could crash if connecting to a
malicious SSLv2 server. (CVE-2006-4343)
[Tavis Ormandy and Will Drewry, Google Security Team]
*) Change ciphersuite string processing so that an explicit
ciphersuite selects this one ciphersuite (so that "AES256-SHA"
will no longer include "AES128-SHA"), and any other similar
ciphersuite (same bitmap) from *other* protocol versions (so that
"RC4-MD5" will still include both the SSL 2.0 ciphersuite and the
SSL 3.0/TLS 1.0 ciphersuite). This is a backport combining
changes from 0.9.8b and 0.9.8d.
[Bodo Moeller]
Changes between 0.9.7j and 0.9.7k [05 Sep 2006]
*) Avoid PKCS #1 v1.5 signature attack discovered by Daniel Bleichenbacher
(CVE-2006-4339) [Ben Laurie and Google Security Team]
*) Change the Unix randomness entropy gathering to use poll() when
possible instead of select(), since the latter has some
undesirable limitations.
[Darryl Miles via Richard Levitte and Bodo Moeller]
*) Disable rogue ciphersuites:
- SSLv2 0x08 0x00 0x80 ("RC4-64-MD5")
- SSLv3/TLSv1 0x00 0x61 ("EXP1024-RC2-CBC-MD5")
- SSLv3/TLSv1 0x00 0x60 ("EXP1024-RC4-MD5")
The latter two were purportedly from
draft-ietf-tls-56-bit-ciphersuites-0[01].txt, but do not really
appear there.
Also deactive the remaining ciphersuites from
draft-ietf-tls-56-bit-ciphersuites-01.txt. These are just as
unofficial, and the ID has long expired.
[Bodo Moeller]
*) Fix RSA blinding Heisenbug (problems sometimes occured on
dual-core machines) and other potential thread-safety issues.
[Bodo Moeller]
Changes between 0.9.7i and 0.9.7j [04 May 2006]
*) Adapt fipsld and the build system to link against the validated FIPS
module in FIPS mode.
[Steve Henson]
*) Fixes for VC++ 2005 build under Windows.
[Steve Henson]
*) Add new Windows build target VC-32-GMAKE for VC++. This uses GNU make
from a Windows bash shell such as MSYS. It is autodetected from the
"config" script when run from a VC++ environment. Modify standard VC++
build to use fipscanister.o from the GNU make build.
[Steve Henson]
Changes between 0.9.7h and 0.9.7i [14 Oct 2005]
*) Wrapped the definition of EVP_MAX_MD_SIZE in a #ifdef OPENSSL_FIPS.
The value now differs depending on if you build for FIPS or not.
BEWARE! A program linked with a shared FIPSed libcrypto can't be
safely run with a non-FIPSed libcrypto, as it may crash because of
the difference induced by this change.
[Andy Polyakov]
Changes between 0.9.7g and 0.9.7h [11 Oct 2005]
*) Remove the functionality of SSL_OP_MSIE_SSLV2_RSA_PADDING
(part of SSL_OP_ALL). This option used to disable the
countermeasure against man-in-the-middle protocol-version
rollback in the SSL 2.0 server implementation, which is a bad
idea. (CVE-2005-2969)
[Bodo Moeller; problem pointed out by Yutaka Oiwa (Research Center
for Information Security, National Institute of Advanced Industrial
Science and Technology [AIST], Japan)]
*) Minimal support for X9.31 signatures and PSS padding modes. This is
mainly for FIPS compliance and not fully integrated at this stage.
[Steve Henson]
*) For DSA signing, unless DSA_FLAG_NO_EXP_CONSTTIME is set, perform
the exponentiation using a fixed-length exponent. (Otherwise,
the information leaked through timing could expose the secret key
after many signatures; cf. Bleichenbacher's attack on DSA with
biased k.)
[Bodo Moeller]
*) Make a new fixed-window mod_exp implementation the default for
RSA, DSA, and DH private-key operations so that the sequence of
squares and multiplies and the memory access pattern are
independent of the particular secret key. This will mitigate
cache-timing and potential related attacks.
BN_mod_exp_mont_consttime() is the new exponentiation implementation,
and this is automatically used by BN_mod_exp_mont() if the new flag
BN_FLG_EXP_CONSTTIME is set for the exponent. RSA, DSA, and DH
will use this BN flag for private exponents unless the flag
DH_FLAG_NO_EXP_CONSTTIME, respectively, is set.
[Matthew D Wood (Intel Corp), with some changes by Bodo Moeller]
*) Change the client implementation for SSLv23_method() and
SSLv23_client_method() so that is uses the SSL 3.0/TLS 1.0
Client Hello message format if the SSL_OP_NO_SSLv2 option is set.
(Previously, the SSL 2.0 backwards compatible Client Hello
message format would be used even with SSL_OP_NO_SSLv2.)
[Bodo Moeller]
*) Add support for smime-type MIME parameter in S/MIME messages which some
clients need.
[Steve Henson]
*) New function BN_MONT_CTX_set_locked() to set montgomery parameters in
a threadsafe manner. Modify rsa code to use new function and add calls
to dsa and dh code (which had race conditions before).
[Steve Henson]
*) Include the fixed error library code in the C error file definitions
instead of fixing them up at runtime. This keeps the error code
structures constant.
[Steve Henson]
Changes between 0.9.7f and 0.9.7g [11 Apr 2005]
[NB: OpenSSL 0.9.7h and later 0.9.7 patch levels were released after
OpenSSL 0.9.8.]
*) Fixes for newer kerberos headers. NB: the casts are needed because
the 'length' field is signed on one version and unsigned on another
with no (?) obvious way to tell the difference, without these VC++
complains. Also the "definition" of FAR (blank) is no longer included
nor is the error ENOMEM. KRB5_PRIVATE has to be set to 1 to pick up
some needed definitions.
[Steve Henson]
*) Undo Cygwin change.
[Ulf Möller]
*) Added support for proxy certificates according to RFC 3820.
Because they may be a security thread to unaware applications,
they must be explicitely allowed in run-time. See
docs/HOWTO/proxy_certificates.txt for further information.
[Richard Levitte]
Changes between 0.9.7e and 0.9.7f [22 Mar 2005]
*) Use (SSL_RANDOM_VALUE - 4) bytes of pseudo random data when generating
server and client random values. Previously
(SSL_RANDOM_VALUE - sizeof(time_t)) would be used which would result in
less random data when sizeof(time_t) > 4 (some 64 bit platforms).
This change has negligible security impact because:
1. Server and client random values still have 24 bytes of pseudo random
2. Server and client random values are sent in the clear in the initial
3. The master secret is derived using the premaster secret (48 bytes in
size for static RSA ciphersuites) as well as client server and random
The OpenSSL team would like to thank the UK NISCC for bringing this issue
to our attention.
[Stephen Henson, reported by UK NISCC]
*) Use Windows randomness collection on Cygwin.
[Ulf Möller]
*) Fix hang in EGD/PRNGD query when communication socket is closed
prematurely by EGD/PRNGD.
[Darren Tucker <> via Lutz Jänicke, resolves #1014]
*) Prompt for pass phrases when appropriate for PKCS12 input format.
[Steve Henson]
*) Back-port of selected performance improvements from development
branch, as well as improved support for PowerPC platforms.
[Andy Polyakov]
*) Add lots of checks for memory allocation failure, error codes to indicate
failure and freeing up memory if a failure occurs.
[Nauticus Networks SSL Team <>, Steve Henson]
*) Add new -passin argument to dgst.
[Steve Henson]
*) Perform some character comparisons of different types in X509_NAME_cmp:
this is needed for some certificates that reencode DNs into UTF8Strings
(in violation of RFC3280) and can't or wont issue name rollover
[Steve Henson]
*) Make an explicit check during certificate validation to see that
the CA setting in each certificate on the chain is correct. As a
side effect always do the following basic checks on extensions,
not just when there's an associated purpose to the check:
- if there is an unhandled critical extension (unless the user
has chosen to ignore this fault)
- if the path length has been exceeded (if one is set at all)
- that certain extensions fit the associated purpose (if one has
been given)
[Richard Levitte]
Changes between 0.9.7d and 0.9.7e [25 Oct 2004]
*) Avoid a race condition when CRLs are checked in a multi threaded
environment. This would happen due to the reordering of the revoked
entries during signature checking and serial number lookup. Now the
encoding is cached and the serial number sort performed under a lock.
Add new STACK function sk_is_sorted().
[Steve Henson]
*) Add Delta CRL to the extension code.
[Steve Henson]
*) Various fixes to s3_pkt.c so alerts are sent properly.
[David Holmes <>]
*) Reduce the chances of duplicate issuer name and serial numbers (in
violation of RFC3280) using the OpenSSL certificate creation utilities.
This is done by creating a random 64 bit value for the initial serial
number when a serial number file is created or when a self signed
certificate is created using 'openssl req -x509'. The initial serial
number file is created using 'openssl x509 -next_serial' in
rather than being initialized to 1.
[Steve Henson]
Changes between 0.9.7c and 0.9.7d [17 Mar 2004]
*) Fix null-pointer assignment in do_change_cipher_spec() revealed
by using the Codenomicon TLS Test Tool (CVE-2004-0079)
[Joe Orton, Steve Henson]
*) Fix flaw in SSL/TLS handshaking when using Kerberos ciphersuites
[Joe Orton, Steve Henson]
*) Make it possible to have multiple active certificates with the same
subject in the CA index file. This is done only if the keyword
'unique_subject' is set to 'no' in the main CA section (default
if 'CA_default') of the configuration file. The value is saved
with the database itself in a separate index attribute file,
named like the index file with '.attr' appended to the name.
[Richard Levitte]
*) X509 verify fixes. Disable broken certificate workarounds when
X509_V_FLAGS_X509_STRICT is set. Check CRL issuer has cRLSign set if
keyUsage extension present. Don't accept CRLs with unhandled critical
extensions: since verify currently doesn't process CRL extensions this
rejects a CRL with *any* critical extensions. Add new verify error codes
for these cases.
[Steve Henson]
*) When creating an OCSP nonce use an OCTET STRING inside the extnValue.
A clarification of RFC2560 will require the use of OCTET STRINGs and
some implementations cannot handle the current raw format. Since OpenSSL
copies and compares OCSP nonces as opaque blobs without any attempt at
parsing them this should not create any compatibility issues.
[Steve Henson]
*) New md flag EVP_MD_CTX_FLAG_REUSE this allows md_data to be reused when
calling EVP_MD_CTX_copy_ex() to avoid calling OPENSSL_malloc(). Without
this HMAC (and other) operations are several times slower than OpenSSL
< 0.9.7.
[Steve Henson]
*) Print out GeneralizedTime and UTCTime in ASN1_STRING_print_ex().
[Peter Sylvester <>]
*) Use the correct content when signing type "other".
[Steve Henson]
Changes between 0.9.7b and 0.9.7c [30 Sep 2003]
*) Fix various bugs revealed by running the NISCC test suite:
Stop out of bounds reads in the ASN1 code when presented with
invalid tags (CVE-2003-0543 and CVE-2003-0544).
Free up ASN1_TYPE correctly if ANY type is invalid (CVE-2003-0545).
If verify callback ignores invalid public key errors don't try to check
certificate signature with the NULL public key.
[Steve Henson]
*) New -ignore_err option in ocsp application to stop the server
exiting on the first error in a request.
[Steve Henson]
*) In ssl3_accept() (ssl/s3_srvr.c) only accept a client certificate
if the server requested one: as stated in TLS 1.0 and SSL 3.0
[Steve Henson]
*) In ssl3_get_client_hello() (ssl/s3_srvr.c), tolerate additional
extra data after the compression methods not only for TLS 1.0
but also for SSL 3.0 (as required by the specification).
[Bodo Moeller; problem pointed out by Matthias Loepfe]
*) Change X509_certificate_type() to mark the key as exported/exportable
when it's 512 *bits* long, not 512 bytes.
[Richard Levitte]
*) Change AES_cbc_encrypt() so it outputs exact multiple of
blocks during encryption.
[Richard Levitte]
*) Various fixes to base64 BIO and non blocking I/O. On write
flushes were not handled properly if the BIO retried. On read
data was not being buffered properly and had various logic bugs.
This also affects blocking I/O when the data being decoded is a
certain size.
[Steve Henson]
*) Various S/MIME bugfixes and compatibility changes:
output correct application/pkcs7 MIME type if
PKCS7_NOOLDMIMETYPE is set. Tolerate some broken signatures.
Output CR+LF for EOL if PKCS7_CRLFEOL is set (this makes opening
of files as .eml work). Correctly handle very long lines in MIME
[Steve Henson]
Changes between 0.9.7a and 0.9.7b [10 Apr 2003]
*) Countermeasure against the Klima-Pokorny-Rosa extension of
Bleichbacher's attack on PKCS #1 v1.5 padding: treat
a protocol version number mismatch like a decryption error
in ssl3_get_client_key_exchange (ssl/s3_srvr.c).
[Bodo Moeller]
*) Turn on RSA blinding by default in the default implementation
to avoid a timing attack. Applications that don't want it can call
RSA_blinding_off() or use the new flag RSA_FLAG_NO_BLINDING.
They would be ill-advised to do so in most cases.
[Ben Laurie, Steve Henson, Geoff Thorpe, Bodo Moeller]
*) Change RSA blinding code so that it works when the PRNG is not
seeded (in this case, the secret RSA exponent is abused as
an unpredictable seed -- if it is not unpredictable, there
is no point in blinding anyway). Make RSA blinding thread-safe
by remembering the creator's thread ID in rsa->blinding and
having all other threads use local one-time blinding factors
(this requires more computation than sharing rsa->blinding, but
avoids excessive locking; and if an RSA object is not shared
between threads, blinding will still be very fast).
[Bodo Moeller]
*) Fixed a typo bug that would cause ENGINE_set_default() to set an
ENGINE as defaults for all supported algorithms irrespective of
the 'flags' parameter. 'flags' is now honoured, so applications
should make sure they are passing it correctly.
[Geoff Thorpe]
*) Target "mingw" now allows native Windows code to be generated in
the Cygwin environment as well as with the MinGW compiler.
[Ulf Moeller]
Changes between 0.9.7 and 0.9.7a [19 Feb 2003]
*) In ssl3_get_record (ssl/s3_pkt.c), minimize information leaked
via timing by performing a MAC computation even if incorrrect
block cipher padding has been found. This is a countermeasure
against active attacks where the attacker has to distinguish
between bad padding and a MAC verification error. (CVE-2003-0078)
[Bodo Moeller; problem pointed out by Brice Canvel (EPFL),
Alain Hiltgen (UBS), Serge Vaudenay (EPFL), and
Martin Vuagnoux (EPFL, Ilion)]
*) Make the no-err option work as intended. The intention with no-err
is not to have the whole error stack handling routines removed from
libcrypto, it's only intended to remove all the function name and
reason texts, thereby removing some of the footprint that may not
be interesting if those errors aren't displayed anyway.
NOTE: it's still possible for any application or module to have it's
own set of error texts inserted. The routines are there, just not
used by default when no-err is given.
[Richard Levitte]
*) Add support for FreeBSD on IA64.
[ via Richard Levitte, resolves #454]
*) Adjust DES_cbc_cksum() so it returns the same value as the MIT
Kerberos function mit_des_cbc_cksum(). Before this change,
the value returned by DES_cbc_cksum() was like the one from
mit_des_cbc_cksum(), except the bytes were swapped.
[Kevin Greaney <> and Richard Levitte]
*) Allow an application to disable the automatic SSL chain building.
Before this a rather primitive chain build was always performed in
ssl3_output_cert_chain(): an application had no way to send the
correct chain if the automatic operation produced an incorrect result.
Now the chain builder is disabled if either:
1. Extra certificates are added via SSL_CTX_add_extra_chain_cert().
2. The mode flag SSL_MODE_NO_AUTO_CHAIN is set.
The reasoning behind this is that an application would not want the
auto chain building to take place if extra chain certificates are
present and it might also want a means of sending no additional
certificates (for example the chain has two certificates and the
root is omitted).
[Steve Henson]
*) Add the possibility to build without the ENGINE framework.
[Steven Reddie <> via Richard Levitte]
*) Under Win32 gmtime() can return NULL: check return value in
OPENSSL_gmtime(). Add error code for case where gmtime() fails.
[Steve Henson]
*) DSA routines: under certain error conditions uninitialized BN objects
could be freed. Solution: make sure initialization is performed early
enough. (Reported and fix supplied by Ivan D Nestlerode <nestler@MIT.EDU>,
Nils Larsch <> via PR#459)
[Lutz Jaenicke]
*) Another fix for SSLv2 session ID handling: the session ID was incorrectly
checked on reconnect on the client side, therefore session resumption
could still fail with a "ssl session id is different" error. This
behaviour is masked when SSL_OP_ALL is used due to
Behaviour observed by Crispin Flowerday <> as
followup to PR #377.
[Lutz Jaenicke]