| /* ==================================================================== |
| * Copyright (c) 2011 The OpenSSL Project. All rights reserved. |
| * |
| * 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 above 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 acknowledgment: |
| * "This product includes software developed by the OpenSSL Project |
| * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" |
| * |
| * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
| * endorse or promote products derived from this software without |
| * prior written permission. For written permission, please contact |
| * licensing@OpenSSL.org. |
| * |
| * 5. Products derived from this software may not be called "OpenSSL" |
| * nor may "OpenSSL" appear in their names without prior written |
| * permission of the OpenSSL Project. |
| * |
| * 6. Redistributions of any form whatsoever must retain the following |
| * acknowledgment: |
| * "This product includes software developed by the OpenSSL Project |
| * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
| * EXPRESSED 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 OpenSSL PROJECT OR |
| * ITS 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. |
| * ==================================================================== |
| */ |
| |
| #include <openssl/opensslconf.h> |
| |
| #include <stdio.h> |
| #include <string.h> |
| |
| #if !defined(OPENSSL_NO_RC4) && !defined(OPENSSL_NO_MD5) |
| |
| # include <openssl/crypto.h> |
| # include <openssl/evp.h> |
| # include <openssl/objects.h> |
| # include <openssl/rc4.h> |
| # include <openssl/md5.h> |
| |
| # ifndef EVP_CIPH_FLAG_AEAD_CIPHER |
| # define EVP_CIPH_FLAG_AEAD_CIPHER 0x200000 |
| # define EVP_CTRL_AEAD_TLS1_AAD 0x16 |
| # define EVP_CTRL_AEAD_SET_MAC_KEY 0x17 |
| # endif |
| |
| /* FIXME: surely this is available elsewhere? */ |
| # define EVP_RC4_KEY_SIZE 16 |
| |
| typedef struct { |
| RC4_KEY ks; |
| MD5_CTX head, tail, md; |
| size_t payload_length; |
| } EVP_RC4_HMAC_MD5; |
| |
| # define NO_PAYLOAD_LENGTH ((size_t)-1) |
| |
| void rc4_md5_enc(RC4_KEY *key, const void *in0, void *out, |
| MD5_CTX *ctx, const void *inp, size_t blocks); |
| |
| # define data(ctx) ((EVP_RC4_HMAC_MD5 *)(ctx)->cipher_data) |
| |
| static int rc4_hmac_md5_init_key(EVP_CIPHER_CTX *ctx, |
| const unsigned char *inkey, |
| const unsigned char *iv, int enc) |
| { |
| EVP_RC4_HMAC_MD5 *key = data(ctx); |
| |
| RC4_set_key(&key->ks, EVP_CIPHER_CTX_key_length(ctx), inkey); |
| |
| MD5_Init(&key->head); /* handy when benchmarking */ |
| key->tail = key->head; |
| key->md = key->head; |
| |
| key->payload_length = NO_PAYLOAD_LENGTH; |
| |
| return 1; |
| } |
| |
| # if !defined(OPENSSL_NO_ASM) && ( \ |
| defined(__x86_64) || defined(__x86_64__) || \ |
| defined(_M_AMD64) || defined(_M_X64) || \ |
| defined(__INTEL__) ) && \ |
| !(defined(__APPLE__) && defined(__MACH__)) |
| # define STITCHED_CALL |
| # endif |
| |
| # if !defined(STITCHED_CALL) |
| # define rc4_off 0 |
| # define md5_off 0 |
| # endif |
| |
| static int rc4_hmac_md5_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, |
| const unsigned char *in, size_t len) |
| { |
| EVP_RC4_HMAC_MD5 *key = data(ctx); |
| # if defined(STITCHED_CALL) |
| size_t rc4_off = 32 - 1 - (key->ks.x & (32 - 1)), /* 32 is $MOD from |
| * rc4_md5-x86_64.pl */ |
| md5_off = MD5_CBLOCK - key->md.num, blocks; |
| unsigned int l; |
| extern unsigned int OPENSSL_ia32cap_P[]; |
| # endif |
| size_t plen = key->payload_length; |
| |
| if (plen != NO_PAYLOAD_LENGTH && len != (plen + MD5_DIGEST_LENGTH)) |
| return 0; |
| |
| if (ctx->encrypt) { |
| if (plen == NO_PAYLOAD_LENGTH) |
| plen = len; |
| # if defined(STITCHED_CALL) |
| /* cipher has to "fall behind" */ |
| if (rc4_off > md5_off) |
| md5_off += MD5_CBLOCK; |
| |
| if (plen > md5_off && (blocks = (plen - md5_off) / MD5_CBLOCK) && |
| (OPENSSL_ia32cap_P[0] & (1 << 20)) == 0) { |
| MD5_Update(&key->md, in, md5_off); |
| RC4(&key->ks, rc4_off, in, out); |
| |
| rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off, |
| &key->md, in + md5_off, blocks); |
| blocks *= MD5_CBLOCK; |
| rc4_off += blocks; |
| md5_off += blocks; |
| key->md.Nh += blocks >> 29; |
| key->md.Nl += blocks <<= 3; |
| if (key->md.Nl < (unsigned int)blocks) |
| key->md.Nh++; |
| } else { |
| rc4_off = 0; |
| md5_off = 0; |
| } |
| # endif |
| MD5_Update(&key->md, in + md5_off, plen - md5_off); |
| |
| if (plen != len) { /* "TLS" mode of operation */ |
| if (in != out) |
| memcpy(out + rc4_off, in + rc4_off, plen - rc4_off); |
| |
| /* calculate HMAC and append it to payload */ |
| MD5_Final(out + plen, &key->md); |
| key->md = key->tail; |
| MD5_Update(&key->md, out + plen, MD5_DIGEST_LENGTH); |
| MD5_Final(out + plen, &key->md); |
| /* encrypt HMAC at once */ |
| RC4(&key->ks, len - rc4_off, out + rc4_off, out + rc4_off); |
| } else { |
| RC4(&key->ks, len - rc4_off, in + rc4_off, out + rc4_off); |
| } |
| } else { |
| unsigned char mac[MD5_DIGEST_LENGTH]; |
| # if defined(STITCHED_CALL) |
| /* digest has to "fall behind" */ |
| if (md5_off > rc4_off) |
| rc4_off += 2 * MD5_CBLOCK; |
| else |
| rc4_off += MD5_CBLOCK; |
| |
| if (len > rc4_off && (blocks = (len - rc4_off) / MD5_CBLOCK) && |
| (OPENSSL_ia32cap_P[0] & (1 << 20)) == 0) { |
| RC4(&key->ks, rc4_off, in, out); |
| MD5_Update(&key->md, out, md5_off); |
| |
| rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off, |
| &key->md, out + md5_off, blocks); |
| blocks *= MD5_CBLOCK; |
| rc4_off += blocks; |
| md5_off += blocks; |
| l = (key->md.Nl + (blocks << 3)) & 0xffffffffU; |
| if (l < key->md.Nl) |
| key->md.Nh++; |
| key->md.Nl = l; |
| key->md.Nh += blocks >> 29; |
| } else { |
| md5_off = 0; |
| rc4_off = 0; |
| } |
| # endif |
| /* decrypt HMAC at once */ |
| RC4(&key->ks, len - rc4_off, in + rc4_off, out + rc4_off); |
| if (plen != NO_PAYLOAD_LENGTH) { /* "TLS" mode of operation */ |
| MD5_Update(&key->md, out + md5_off, plen - md5_off); |
| |
| /* calculate HMAC and verify it */ |
| MD5_Final(mac, &key->md); |
| key->md = key->tail; |
| MD5_Update(&key->md, mac, MD5_DIGEST_LENGTH); |
| MD5_Final(mac, &key->md); |
| |
| if (CRYPTO_memcmp(out + plen, mac, MD5_DIGEST_LENGTH)) |
| return 0; |
| } else { |
| MD5_Update(&key->md, out + md5_off, len - md5_off); |
| } |
| } |
| |
| key->payload_length = NO_PAYLOAD_LENGTH; |
| |
| return 1; |
| } |
| |
| static int rc4_hmac_md5_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, |
| void *ptr) |
| { |
| EVP_RC4_HMAC_MD5 *key = data(ctx); |
| |
| switch (type) { |
| case EVP_CTRL_AEAD_SET_MAC_KEY: |
| { |
| unsigned int i; |
| unsigned char hmac_key[64]; |
| |
| memset(hmac_key, 0, sizeof(hmac_key)); |
| |
| if (arg > (int)sizeof(hmac_key)) { |
| MD5_Init(&key->head); |
| MD5_Update(&key->head, ptr, arg); |
| MD5_Final(hmac_key, &key->head); |
| } else { |
| memcpy(hmac_key, ptr, arg); |
| } |
| |
| for (i = 0; i < sizeof(hmac_key); i++) |
| hmac_key[i] ^= 0x36; /* ipad */ |
| MD5_Init(&key->head); |
| MD5_Update(&key->head, hmac_key, sizeof(hmac_key)); |
| |
| for (i = 0; i < sizeof(hmac_key); i++) |
| hmac_key[i] ^= 0x36 ^ 0x5c; /* opad */ |
| MD5_Init(&key->tail); |
| MD5_Update(&key->tail, hmac_key, sizeof(hmac_key)); |
| |
| return 1; |
| } |
| case EVP_CTRL_AEAD_TLS1_AAD: |
| { |
| unsigned char *p = ptr; |
| unsigned int len; |
| |
| if (arg != EVP_AEAD_TLS1_AAD_LEN) |
| return -1; |
| |
| len = p[arg - 2] << 8 | p[arg - 1]; |
| |
| if (!ctx->encrypt) { |
| len -= MD5_DIGEST_LENGTH; |
| p[arg - 2] = len >> 8; |
| p[arg - 1] = len; |
| } |
| key->payload_length = len; |
| key->md = key->head; |
| MD5_Update(&key->md, p, arg); |
| |
| return MD5_DIGEST_LENGTH; |
| } |
| default: |
| return -1; |
| } |
| } |
| |
| static EVP_CIPHER r4_hmac_md5_cipher = { |
| # ifdef NID_rc4_hmac_md5 |
| NID_rc4_hmac_md5, |
| # else |
| NID_undef, |
| # endif |
| 1, EVP_RC4_KEY_SIZE, 0, |
| EVP_CIPH_STREAM_CIPHER | EVP_CIPH_VARIABLE_LENGTH | |
| EVP_CIPH_FLAG_AEAD_CIPHER, |
| rc4_hmac_md5_init_key, |
| rc4_hmac_md5_cipher, |
| NULL, |
| sizeof(EVP_RC4_HMAC_MD5), |
| NULL, |
| NULL, |
| rc4_hmac_md5_ctrl, |
| NULL |
| }; |
| |
| const EVP_CIPHER *EVP_rc4_hmac_md5(void) |
| { |
| return (&r4_hmac_md5_cipher); |
| } |
| #endif |
