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/* ====================================================================
* 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/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__) )
#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 (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=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