| /* crypto/rsa/rsa_sign.c */ |
| /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
| * All rights reserved. |
| * |
| * This package is an SSL implementation written |
| * by Eric Young (eay@cryptsoft.com). |
| * The implementation was written so as to conform with Netscapes SSL. |
| * |
| * This library is free for commercial and non-commercial use as long as |
| * the following conditions are aheared to. The following conditions |
| * apply to all code found in this distribution, be it the RC4, RSA, |
| * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
| * included with this distribution is covered by the same copyright terms |
| * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
| * |
| * Copyright remains Eric Young's, and as such any Copyright notices in |
| * the code are not to be removed. |
| * If this package is used in a product, Eric Young should be given attribution |
| * as the author of the parts of the library used. |
| * This can be in the form of a textual message at program startup or |
| * in documentation (online or textual) provided with the package. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. All advertising materials mentioning features or use of this software |
| * must display the following acknowledgement: |
| * "This product includes cryptographic software written by |
| * Eric Young (eay@cryptsoft.com)" |
| * The word 'cryptographic' can be left out if the rouines from the library |
| * being used are not cryptographic related :-). |
| * 4. If you include any Windows specific code (or a derivative thereof) from |
| * the apps directory (application code) you must include an acknowledgement: |
| * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
| * |
| * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * |
| * The licence and distribution terms for any publically available version or |
| * derivative of this code cannot be changed. i.e. this code cannot simply be |
| * copied and put under another distribution licence |
| * [including the GNU Public Licence.] |
| */ |
| |
| #include <openssl/opensslconf.h> |
| #if !defined(OPENSSL_SYS_STARBOARD) |
| #include <stdio.h> |
| #endif // !defined(OPENSSL_SYS_STARBOARD) |
| #include "cryptlib.h" |
| #include <openssl/bn.h> |
| #include <openssl/rsa.h> |
| #include <openssl/objects.h> |
| #include <openssl/x509.h> |
| #include "rsa_locl.h" |
| |
| /* Size of an SSL signature: MD5+SHA1 */ |
| #define SSL_SIG_LENGTH 36 |
| |
| int RSA_sign(int type, const unsigned char *m, unsigned int m_len, |
| unsigned char *sigret, unsigned int *siglen, RSA *rsa) |
| { |
| X509_SIG sig; |
| ASN1_TYPE parameter; |
| int i, j, ret = 1; |
| unsigned char *p, *tmps = NULL; |
| const unsigned char *s = NULL; |
| X509_ALGOR algor; |
| ASN1_OCTET_STRING digest; |
| #ifdef OPENSSL_FIPS |
| if (FIPS_mode() && !(rsa->meth->flags & RSA_FLAG_FIPS_METHOD) |
| && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)) { |
| RSAerr(RSA_F_RSA_SIGN, RSA_R_NON_FIPS_RSA_METHOD); |
| return 0; |
| } |
| #endif |
| if ((rsa->flags & RSA_FLAG_SIGN_VER) && rsa->meth->rsa_sign) { |
| return rsa->meth->rsa_sign(type, m, m_len, sigret, siglen, rsa); |
| } |
| /* Special case: SSL signature, just check the length */ |
| if (type == NID_md5_sha1) { |
| if (m_len != SSL_SIG_LENGTH) { |
| RSAerr(RSA_F_RSA_SIGN, RSA_R_INVALID_MESSAGE_LENGTH); |
| return (0); |
| } |
| i = SSL_SIG_LENGTH; |
| s = m; |
| } else { |
| sig.algor = &algor; |
| sig.algor->algorithm = OBJ_nid2obj(type); |
| if (sig.algor->algorithm == NULL) { |
| RSAerr(RSA_F_RSA_SIGN, RSA_R_UNKNOWN_ALGORITHM_TYPE); |
| return (0); |
| } |
| if (sig.algor->algorithm->length == 0) { |
| RSAerr(RSA_F_RSA_SIGN, |
| RSA_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD); |
| return (0); |
| } |
| parameter.type = V_ASN1_NULL; |
| parameter.value.ptr = NULL; |
| sig.algor->parameter = ¶meter; |
| |
| sig.digest = &digest; |
| sig.digest->data = (unsigned char *)m; /* TMP UGLY CAST */ |
| sig.digest->length = m_len; |
| |
| i = i2d_X509_SIG(&sig, NULL); |
| } |
| j = RSA_size(rsa); |
| if (i > (j - RSA_PKCS1_PADDING_SIZE)) { |
| RSAerr(RSA_F_RSA_SIGN, RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY); |
| return (0); |
| } |
| if (type != NID_md5_sha1) { |
| tmps = (unsigned char *)OPENSSL_malloc((unsigned int)j + 1); |
| if (tmps == NULL) { |
| RSAerr(RSA_F_RSA_SIGN, ERR_R_MALLOC_FAILURE); |
| return (0); |
| } |
| p = tmps; |
| i2d_X509_SIG(&sig, &p); |
| s = tmps; |
| } |
| i = RSA_private_encrypt(i, s, sigret, rsa, RSA_PKCS1_PADDING); |
| if (i <= 0) |
| ret = 0; |
| else |
| *siglen = i; |
| |
| if (type != NID_md5_sha1) { |
| OPENSSL_cleanse(tmps, (unsigned int)j + 1); |
| OPENSSL_free(tmps); |
| } |
| return (ret); |
| } |
| |
| /* |
| * Check DigestInfo structure does not contain extraneous data by reencoding |
| * using DER and checking encoding against original. |
| */ |
| static int rsa_check_digestinfo(X509_SIG *sig, const unsigned char *dinfo, |
| int dinfolen) |
| { |
| unsigned char *der = NULL; |
| int derlen; |
| int ret = 0; |
| derlen = i2d_X509_SIG(sig, &der); |
| if (derlen <= 0) |
| return 0; |
| if (derlen == dinfolen && !OPENSSL_port_memcmp(dinfo, der, derlen)) |
| ret = 1; |
| OPENSSL_cleanse(der, derlen); |
| OPENSSL_free(der); |
| return ret; |
| } |
| |
| int int_rsa_verify(int dtype, const unsigned char *m, |
| unsigned int m_len, |
| unsigned char *rm, size_t *prm_len, |
| const unsigned char *sigbuf, size_t siglen, RSA *rsa) |
| { |
| int i, ret = 0, sigtype; |
| unsigned char *s; |
| X509_SIG *sig = NULL; |
| |
| #ifdef OPENSSL_FIPS |
| if (FIPS_mode() && !(rsa->meth->flags & RSA_FLAG_FIPS_METHOD) |
| && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)) { |
| RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_NON_FIPS_RSA_METHOD); |
| return 0; |
| } |
| #endif |
| |
| if (siglen != (unsigned int)RSA_size(rsa)) { |
| RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_WRONG_SIGNATURE_LENGTH); |
| return (0); |
| } |
| |
| if ((dtype == NID_md5_sha1) && rm) { |
| i = RSA_public_decrypt((int)siglen, |
| sigbuf, rm, rsa, RSA_PKCS1_PADDING); |
| if (i <= 0) |
| return 0; |
| *prm_len = i; |
| return 1; |
| } |
| |
| s = (unsigned char *)OPENSSL_malloc((unsigned int)siglen); |
| if (s == NULL) { |
| RSAerr(RSA_F_INT_RSA_VERIFY, ERR_R_MALLOC_FAILURE); |
| goto err; |
| } |
| if ((dtype == NID_md5_sha1) && (m_len != SSL_SIG_LENGTH)) { |
| RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_INVALID_MESSAGE_LENGTH); |
| goto err; |
| } |
| i = RSA_public_decrypt((int)siglen, sigbuf, s, rsa, RSA_PKCS1_PADDING); |
| |
| if (i <= 0) |
| goto err; |
| /* |
| * Oddball MDC2 case: signature can be OCTET STRING. check for correct |
| * tag and length octets. |
| */ |
| if (dtype == NID_mdc2 && i == 18 && s[0] == 0x04 && s[1] == 0x10) { |
| if (rm) { |
| OPENSSL_port_memcpy(rm, s + 2, 16); |
| *prm_len = 16; |
| ret = 1; |
| } else if (OPENSSL_port_memcmp(m, s + 2, 16)) |
| RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_BAD_SIGNATURE); |
| else |
| ret = 1; |
| } |
| |
| /* Special case: SSL signature */ |
| if (dtype == NID_md5_sha1) { |
| if ((i != SSL_SIG_LENGTH) || OPENSSL_port_memcmp(s, m, SSL_SIG_LENGTH)) |
| RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_BAD_SIGNATURE); |
| else |
| ret = 1; |
| } else { |
| const unsigned char *p = s; |
| sig = d2i_X509_SIG(NULL, &p, (long)i); |
| |
| if (sig == NULL) |
| goto err; |
| |
| /* Excess data can be used to create forgeries */ |
| if (p != s + i || !rsa_check_digestinfo(sig, s, i)) { |
| RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_BAD_SIGNATURE); |
| goto err; |
| } |
| |
| /* |
| * Parameters to the signature algorithm can also be used to create |
| * forgeries |
| */ |
| if (sig->algor->parameter |
| && ASN1_TYPE_get(sig->algor->parameter) != V_ASN1_NULL) { |
| RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_BAD_SIGNATURE); |
| goto err; |
| } |
| |
| sigtype = OBJ_obj2nid(sig->algor->algorithm); |
| |
| #ifdef RSA_DEBUG |
| /* put a backward compatibility flag in EAY */ |
| OPENSSL_port_printferr("in(%s) expect(%s)\n", OBJ_nid2ln(sigtype), |
| OBJ_nid2ln(dtype)); |
| #endif |
| if (sigtype != dtype) { |
| if (((dtype == NID_md5) && |
| (sigtype == NID_md5WithRSAEncryption)) || |
| ((dtype == NID_md2) && |
| (sigtype == NID_md2WithRSAEncryption))) { |
| /* ok, we will let it through */ |
| #if !defined(OPENSSL_NO_STDIO) && !defined(OPENSSL_SYS_WIN16) |
| OPENSSL_port_printferr( |
| "signature has problems, re-make with post SSLeay045\n"); |
| #endif |
| } else { |
| RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_ALGORITHM_MISMATCH); |
| goto err; |
| } |
| } |
| if (rm) { |
| const EVP_MD *md; |
| md = EVP_get_digestbynid(dtype); |
| if (md && (EVP_MD_size(md) != sig->digest->length)) |
| RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_INVALID_DIGEST_LENGTH); |
| else { |
| OPENSSL_port_memcpy(rm, sig->digest->data, sig->digest->length); |
| *prm_len = sig->digest->length; |
| ret = 1; |
| } |
| } else if (((unsigned int)sig->digest->length != m_len) || |
| (OPENSSL_port_memcmp(m, sig->digest->data, m_len) != 0)) { |
| RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_BAD_SIGNATURE); |
| } else |
| ret = 1; |
| } |
| err: |
| if (sig != NULL) |
| X509_SIG_free(sig); |
| if (s != NULL) { |
| OPENSSL_cleanse(s, (unsigned int)siglen); |
| OPENSSL_free(s); |
| } |
| return (ret); |
| } |
| |
| int RSA_verify(int dtype, const unsigned char *m, unsigned int m_len, |
| const unsigned char *sigbuf, unsigned int siglen, RSA *rsa) |
| { |
| |
| if ((rsa->flags & RSA_FLAG_SIGN_VER) && rsa->meth->rsa_verify) { |
| return rsa->meth->rsa_verify(dtype, m, m_len, sigbuf, siglen, rsa); |
| } |
| |
| return int_rsa_verify(dtype, m, m_len, NULL, NULL, sigbuf, siglen, rsa); |
| } |
