306 lines
8.4 KiB
C
306 lines
8.4 KiB
C
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/* $OpenBSD: e_rc4_hmac_md5.c,v 1.8 2017/01/31 13:17:21 inoguchi Exp $ */
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/* ====================================================================
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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 <stdio.h>
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#include <string.h>
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#include <openssl/opensslconf.h>
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#if !defined(OPENSSL_NO_RC4) && !defined(OPENSSL_NO_MD5)
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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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/* 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
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rc4_hmac_md5_init_key(EVP_CIPHER_CTX *ctx, 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) && defined(RC4_MD5_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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#include "x86_arch.h"
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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
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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 rc4_md5-x86_64.pl */
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md5_off = MD5_CBLOCK - key->md.num,
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blocks;
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unsigned int l;
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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 &&
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(blocks = (plen - md5_off) / MD5_CBLOCK) &&
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(OPENSSL_cpu_caps() & CPUCAP_MASK_INTELP4) == 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,
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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,
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out + rc4_off);
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} else {
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RC4(&key->ks, len - rc4_off, in + rc4_off,
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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_cpu_caps() & CPUCAP_MASK_INTELP4) == 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 (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
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rc4_hmac_md5_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, 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 = p[arg - 2] << 8 | p[arg - 1];
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if (!ctx->encrypt) {
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if (len < MD5_DIGEST_LENGTH)
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return -1;
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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|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 *
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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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