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308 lines
9.9 KiB
308 lines
9.9 KiB
/* ==================================================================== |
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* Copyright (c) 2011 The OpenSSL Project. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* 3. All advertising materials mentioning features or use of this |
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* software must display the following acknowledgment: |
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* "This product includes software developed by the OpenSSL Project |
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" |
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* |
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
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* endorse or promote products derived from this software without |
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* prior written permission. For written permission, please contact |
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* licensing@OpenSSL.org. |
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* |
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* 5. Products derived from this software may not be called "OpenSSL" |
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* nor may "OpenSSL" appear in their names without prior written |
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* permission of the OpenSSL Project. |
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* |
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* 6. Redistributions of any form whatsoever must retain the following |
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* acknowledgment: |
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* "This product includes software developed by the OpenSSL Project |
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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* OF THE POSSIBILITY OF SUCH DAMAGE. |
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* ==================================================================== |
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*/ |
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#include <openssl/opensslconf.h> |
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#include <stdio.h> |
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#include <string.h> |
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#if !defined(OPENSSL_NO_RC4) && !defined(OPENSSL_NO_MD5) |
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# include <openssl/crypto.h> |
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# include <openssl/evp.h> |
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# include <openssl/objects.h> |
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# include <openssl/rc4.h> |
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# include <openssl/md5.h> |
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# ifndef EVP_CIPH_FLAG_AEAD_CIPHER |
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# define EVP_CIPH_FLAG_AEAD_CIPHER 0x200000 |
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# define EVP_CTRL_AEAD_TLS1_AAD 0x16 |
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# define EVP_CTRL_AEAD_SET_MAC_KEY 0x17 |
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# endif |
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/* FIXME: surely this is available elsewhere? */ |
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# define EVP_RC4_KEY_SIZE 16 |
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typedef struct { |
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RC4_KEY ks; |
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MD5_CTX head, tail, md; |
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size_t payload_length; |
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} EVP_RC4_HMAC_MD5; |
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# define NO_PAYLOAD_LENGTH ((size_t)-1) |
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void rc4_md5_enc(RC4_KEY *key, const void *in0, void *out, |
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MD5_CTX *ctx, const void *inp, size_t blocks); |
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# define data(ctx) ((EVP_RC4_HMAC_MD5 *)(ctx)->cipher_data) |
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static int rc4_hmac_md5_init_key(EVP_CIPHER_CTX *ctx, |
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const unsigned char *inkey, |
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const unsigned char *iv, int enc) |
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{ |
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EVP_RC4_HMAC_MD5 *key = data(ctx); |
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RC4_set_key(&key->ks, EVP_CIPHER_CTX_key_length(ctx), inkey); |
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MD5_Init(&key->head); /* handy when benchmarking */ |
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key->tail = key->head; |
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key->md = key->head; |
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key->payload_length = NO_PAYLOAD_LENGTH; |
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return 1; |
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} |
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# if !defined(OPENSSL_NO_ASM) && ( \ |
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defined(__x86_64) || defined(__x86_64__) || \ |
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defined(_M_AMD64) || defined(_M_X64) || \ |
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defined(__INTEL__) ) && \ |
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!(defined(__APPLE__) && defined(__MACH__)) |
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# define STITCHED_CALL |
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# endif |
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# if !defined(STITCHED_CALL) |
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# define rc4_off 0 |
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# define md5_off 0 |
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# endif |
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static int rc4_hmac_md5_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, |
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const unsigned char *in, size_t len) |
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{ |
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EVP_RC4_HMAC_MD5 *key = data(ctx); |
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# if defined(STITCHED_CALL) |
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size_t rc4_off = 32 - 1 - (key->ks.x & (32 - 1)), /* 32 is $MOD from |
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* rc4_md5-x86_64.pl */ |
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md5_off = MD5_CBLOCK - key->md.num, blocks; |
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unsigned int l; |
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extern unsigned int OPENSSL_ia32cap_P[]; |
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# endif |
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size_t plen = key->payload_length; |
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if (plen != NO_PAYLOAD_LENGTH && len != (plen + MD5_DIGEST_LENGTH)) |
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return 0; |
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if (ctx->encrypt) { |
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if (plen == NO_PAYLOAD_LENGTH) |
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plen = len; |
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# if defined(STITCHED_CALL) |
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/* cipher has to "fall behind" */ |
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if (rc4_off > md5_off) |
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md5_off += MD5_CBLOCK; |
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if (plen > md5_off && (blocks = (plen - md5_off) / MD5_CBLOCK) && |
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(OPENSSL_ia32cap_P[0] & (1 << 20)) == 0) { |
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MD5_Update(&key->md, in, md5_off); |
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RC4(&key->ks, rc4_off, in, out); |
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rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off, |
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&key->md, in + md5_off, blocks); |
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blocks *= MD5_CBLOCK; |
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rc4_off += blocks; |
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md5_off += blocks; |
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key->md.Nh += blocks >> 29; |
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key->md.Nl += blocks <<= 3; |
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if (key->md.Nl < (unsigned int)blocks) |
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key->md.Nh++; |
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} else { |
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rc4_off = 0; |
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md5_off = 0; |
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} |
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# endif |
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MD5_Update(&key->md, in + md5_off, plen - md5_off); |
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if (plen != len) { /* "TLS" mode of operation */ |
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if (in != out) |
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memcpy(out + rc4_off, in + rc4_off, plen - rc4_off); |
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/* calculate HMAC and append it to payload */ |
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MD5_Final(out + plen, &key->md); |
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key->md = key->tail; |
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MD5_Update(&key->md, out + plen, MD5_DIGEST_LENGTH); |
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MD5_Final(out + plen, &key->md); |
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/* encrypt HMAC at once */ |
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RC4(&key->ks, len - rc4_off, out + rc4_off, out + rc4_off); |
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} else { |
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RC4(&key->ks, len - rc4_off, in + rc4_off, out + rc4_off); |
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} |
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} else { |
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unsigned char mac[MD5_DIGEST_LENGTH]; |
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# if defined(STITCHED_CALL) |
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/* digest has to "fall behind" */ |
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if (md5_off > rc4_off) |
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rc4_off += 2 * MD5_CBLOCK; |
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else |
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rc4_off += MD5_CBLOCK; |
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if (len > rc4_off && (blocks = (len - rc4_off) / MD5_CBLOCK) && |
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(OPENSSL_ia32cap_P[0] & (1 << 20)) == 0) { |
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RC4(&key->ks, rc4_off, in, out); |
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MD5_Update(&key->md, out, md5_off); |
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rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off, |
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&key->md, out + md5_off, blocks); |
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blocks *= MD5_CBLOCK; |
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rc4_off += blocks; |
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md5_off += blocks; |
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l = (key->md.Nl + (blocks << 3)) & 0xffffffffU; |
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if (l < key->md.Nl) |
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key->md.Nh++; |
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key->md.Nl = l; |
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key->md.Nh += blocks >> 29; |
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} else { |
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md5_off = 0; |
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rc4_off = 0; |
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} |
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# endif |
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/* decrypt HMAC at once */ |
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RC4(&key->ks, len - rc4_off, in + rc4_off, out + rc4_off); |
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if (plen != NO_PAYLOAD_LENGTH) { /* "TLS" mode of operation */ |
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MD5_Update(&key->md, out + md5_off, plen - md5_off); |
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/* calculate HMAC and verify it */ |
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MD5_Final(mac, &key->md); |
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key->md = key->tail; |
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MD5_Update(&key->md, mac, MD5_DIGEST_LENGTH); |
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MD5_Final(mac, &key->md); |
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if (CRYPTO_memcmp(out + plen, mac, MD5_DIGEST_LENGTH)) |
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return 0; |
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} else { |
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MD5_Update(&key->md, out + md5_off, len - md5_off); |
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} |
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} |
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key->payload_length = NO_PAYLOAD_LENGTH; |
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return 1; |
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} |
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static int rc4_hmac_md5_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, |
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void *ptr) |
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{ |
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EVP_RC4_HMAC_MD5 *key = data(ctx); |
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switch (type) { |
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case EVP_CTRL_AEAD_SET_MAC_KEY: |
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{ |
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unsigned int i; |
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unsigned char hmac_key[64]; |
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memset(hmac_key, 0, sizeof(hmac_key)); |
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if (arg > (int)sizeof(hmac_key)) { |
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MD5_Init(&key->head); |
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MD5_Update(&key->head, ptr, arg); |
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MD5_Final(hmac_key, &key->head); |
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} else { |
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memcpy(hmac_key, ptr, arg); |
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} |
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for (i = 0; i < sizeof(hmac_key); i++) |
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hmac_key[i] ^= 0x36; /* ipad */ |
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MD5_Init(&key->head); |
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MD5_Update(&key->head, hmac_key, sizeof(hmac_key)); |
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for (i = 0; i < sizeof(hmac_key); i++) |
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hmac_key[i] ^= 0x36 ^ 0x5c; /* opad */ |
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MD5_Init(&key->tail); |
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MD5_Update(&key->tail, hmac_key, sizeof(hmac_key)); |
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return 1; |
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} |
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case EVP_CTRL_AEAD_TLS1_AAD: |
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{ |
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unsigned char *p = ptr; |
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unsigned int len; |
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if (arg != EVP_AEAD_TLS1_AAD_LEN) |
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return -1; |
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len = p[arg - 2] << 8 | p[arg - 1]; |
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if (!ctx->encrypt) { |
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len -= MD5_DIGEST_LENGTH; |
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p[arg - 2] = len >> 8; |
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p[arg - 1] = len; |
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} |
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key->payload_length = len; |
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key->md = key->head; |
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MD5_Update(&key->md, p, arg); |
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return MD5_DIGEST_LENGTH; |
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} |
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default: |
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return -1; |
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} |
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} |
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static EVP_CIPHER r4_hmac_md5_cipher = { |
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# ifdef NID_rc4_hmac_md5 |
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NID_rc4_hmac_md5, |
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# else |
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NID_undef, |
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# endif |
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1, EVP_RC4_KEY_SIZE, 0, |
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EVP_CIPH_STREAM_CIPHER | EVP_CIPH_VARIABLE_LENGTH | |
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EVP_CIPH_FLAG_AEAD_CIPHER, |
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rc4_hmac_md5_init_key, |
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rc4_hmac_md5_cipher, |
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NULL, |
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sizeof(EVP_RC4_HMAC_MD5), |
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NULL, |
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NULL, |
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rc4_hmac_md5_ctrl, |
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NULL |
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}; |
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const EVP_CIPHER *EVP_rc4_hmac_md5(void) |
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{ |
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return (&r4_hmac_md5_cipher); |
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} |
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#endif
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