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      1 /* ssl/s3_enc.c */
      2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com)
      3  * All rights reserved.
      4  *
      5  * This package is an SSL implementation written
      6  * by Eric Young (eay (at) cryptsoft.com).
      7  * The implementation was written so as to conform with Netscapes SSL.
      8  *
      9  * This library is free for commercial and non-commercial use as long as
     10  * the following conditions are aheared to.  The following conditions
     11  * apply to all code found in this distribution, be it the RC4, RSA,
     12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
     13  * included with this distribution is covered by the same copyright terms
     14  * except that the holder is Tim Hudson (tjh (at) cryptsoft.com).
     15  *
     16  * Copyright remains Eric Young's, and as such any Copyright notices in
     17  * the code are not to be removed.
     18  * If this package is used in a product, Eric Young should be given attribution
     19  * as the author of the parts of the library used.
     20  * This can be in the form of a textual message at program startup or
     21  * in documentation (online or textual) provided with the package.
     22  *
     23  * Redistribution and use in source and binary forms, with or without
     24  * modification, are permitted provided that the following conditions
     25  * are met:
     26  * 1. Redistributions of source code must retain the copyright
     27  *    notice, this list of conditions and the following disclaimer.
     28  * 2. Redistributions in binary form must reproduce the above copyright
     29  *    notice, this list of conditions and the following disclaimer in the
     30  *    documentation and/or other materials provided with the distribution.
     31  * 3. All advertising materials mentioning features or use of this software
     32  *    must display the following acknowledgement:
     33  *    "This product includes cryptographic software written by
     34  *     Eric Young (eay (at) cryptsoft.com)"
     35  *    The word 'cryptographic' can be left out if the rouines from the library
     36  *    being used are not cryptographic related :-).
     37  * 4. If you include any Windows specific code (or a derivative thereof) from
     38  *    the apps directory (application code) you must include an acknowledgement:
     39  *    "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)"
     40  *
     41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
     42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     51  * SUCH DAMAGE.
     52  *
     53  * The licence and distribution terms for any publically available version or
     54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
     55  * copied and put under another distribution licence
     56  * [including the GNU Public Licence.]
     57  */
     58 /* ====================================================================
     59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
     60  *
     61  * Redistribution and use in source and binary forms, with or without
     62  * modification, are permitted provided that the following conditions
     63  * are met:
     64  *
     65  * 1. Redistributions of source code must retain the above copyright
     66  *    notice, this list of conditions and the following disclaimer.
     67  *
     68  * 2. Redistributions in binary form must reproduce the above copyright
     69  *    notice, this list of conditions and the following disclaimer in
     70  *    the documentation and/or other materials provided with the
     71  *    distribution.
     72  *
     73  * 3. All advertising materials mentioning features or use of this
     74  *    software must display the following acknowledgment:
     75  *    "This product includes software developed by the OpenSSL Project
     76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
     77  *
     78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
     79  *    endorse or promote products derived from this software without
     80  *    prior written permission. For written permission, please contact
     81  *    openssl-core (at) openssl.org.
     82  *
     83  * 5. Products derived from this software may not be called "OpenSSL"
     84  *    nor may "OpenSSL" appear in their names without prior written
     85  *    permission of the OpenSSL Project.
     86  *
     87  * 6. Redistributions of any form whatsoever must retain the following
     88  *    acknowledgment:
     89  *    "This product includes software developed by the OpenSSL Project
     90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
     91  *
     92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
     93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
     96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
    101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
    103  * OF THE POSSIBILITY OF SUCH DAMAGE.
    104  * ====================================================================
    105  *
    106  * This product includes cryptographic software written by Eric Young
    107  * (eay (at) cryptsoft.com).  This product includes software written by Tim
    108  * Hudson (tjh (at) cryptsoft.com).
    109  *
    110  */
    111 /* ====================================================================
    112  * Copyright 2005 Nokia. All rights reserved.
    113  *
    114  * The portions of the attached software ("Contribution") is developed by
    115  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
    116  * license.
    117  *
    118  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
    119  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
    120  * support (see RFC 4279) to OpenSSL.
    121  *
    122  * No patent licenses or other rights except those expressly stated in
    123  * the OpenSSL open source license shall be deemed granted or received
    124  * expressly, by implication, estoppel, or otherwise.
    125  *
    126  * No assurances are provided by Nokia that the Contribution does not
    127  * infringe the patent or other intellectual property rights of any third
    128  * party or that the license provides you with all the necessary rights
    129  * to make use of the Contribution.
    130  *
    131  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
    132  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
    133  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
    134  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
    135  * OTHERWISE.
    136  */
    137 
    138 #include <stdio.h>
    139 #include "ssl_locl.h"
    140 #include <openssl/evp.h>
    141 #include <openssl/md5.h>
    142 
    143 static unsigned char ssl3_pad_1[48]={
    144 	0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
    145 	0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
    146 	0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
    147 	0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
    148 	0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
    149 	0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36 };
    150 
    151 static unsigned char ssl3_pad_2[48]={
    152 	0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
    153 	0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
    154 	0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
    155 	0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
    156 	0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
    157 	0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c };
    158 static int ssl3_handshake_mac(SSL *s, int md_nid,
    159 	const char *sender, int len, unsigned char *p);
    160 static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num)
    161 	{
    162 	EVP_MD_CTX m5;
    163 	EVP_MD_CTX s1;
    164 	unsigned char buf[16],smd[SHA_DIGEST_LENGTH];
    165 	unsigned char c='A';
    166 	unsigned int i,j,k;
    167 
    168 #ifdef CHARSET_EBCDIC
    169 	c = os_toascii[c]; /*'A' in ASCII */
    170 #endif
    171 	k=0;
    172 	EVP_MD_CTX_init(&m5);
    173 	EVP_MD_CTX_set_flags(&m5, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
    174 	EVP_MD_CTX_init(&s1);
    175 	for (i=0; (int)i<num; i+=MD5_DIGEST_LENGTH)
    176 		{
    177 		k++;
    178 		if (k > sizeof buf)
    179 			{
    180 			/* bug: 'buf' is too small for this ciphersuite */
    181 			SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);
    182 			return 0;
    183 			}
    184 
    185 		for (j=0; j<k; j++)
    186 			buf[j]=c;
    187 		c++;
    188 		EVP_DigestInit_ex(&s1,EVP_sha1(), NULL);
    189 		EVP_DigestUpdate(&s1,buf,k);
    190 		EVP_DigestUpdate(&s1,s->session->master_key,
    191 			s->session->master_key_length);
    192 		EVP_DigestUpdate(&s1,s->s3->server_random,SSL3_RANDOM_SIZE);
    193 		EVP_DigestUpdate(&s1,s->s3->client_random,SSL3_RANDOM_SIZE);
    194 		EVP_DigestFinal_ex(&s1,smd,NULL);
    195 
    196 		EVP_DigestInit_ex(&m5,EVP_md5(), NULL);
    197 		EVP_DigestUpdate(&m5,s->session->master_key,
    198 			s->session->master_key_length);
    199 		EVP_DigestUpdate(&m5,smd,SHA_DIGEST_LENGTH);
    200 		if ((int)(i+MD5_DIGEST_LENGTH) > num)
    201 			{
    202 			EVP_DigestFinal_ex(&m5,smd,NULL);
    203 			memcpy(km,smd,(num-i));
    204 			}
    205 		else
    206 			EVP_DigestFinal_ex(&m5,km,NULL);
    207 
    208 		km+=MD5_DIGEST_LENGTH;
    209 		}
    210 	OPENSSL_cleanse(smd,SHA_DIGEST_LENGTH);
    211 	EVP_MD_CTX_cleanup(&m5);
    212 	EVP_MD_CTX_cleanup(&s1);
    213 	return 1;
    214 	}
    215 
    216 int ssl3_change_cipher_state(SSL *s, int which)
    217 	{
    218 	unsigned char *p,*mac_secret;
    219 	unsigned char exp_key[EVP_MAX_KEY_LENGTH];
    220 	unsigned char exp_iv[EVP_MAX_IV_LENGTH];
    221 	unsigned char *ms,*key,*iv,*er1,*er2;
    222 	EVP_CIPHER_CTX *dd;
    223 	const EVP_CIPHER *c;
    224 #ifndef OPENSSL_NO_COMP
    225 	COMP_METHOD *comp;
    226 #endif
    227 	const EVP_MD *m;
    228 	EVP_MD_CTX md;
    229 	int is_exp,n,i,j,k,cl;
    230 	int reuse_dd = 0;
    231 
    232 	is_exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
    233 	c=s->s3->tmp.new_sym_enc;
    234 	m=s->s3->tmp.new_hash;
    235 	/* m == NULL will lead to a crash later */
    236 	OPENSSL_assert(m);
    237 #ifndef OPENSSL_NO_COMP
    238 	if (s->s3->tmp.new_compression == NULL)
    239 		comp=NULL;
    240 	else
    241 		comp=s->s3->tmp.new_compression->method;
    242 #endif
    243 
    244 	if (which & SSL3_CC_READ)
    245 		{
    246 		if (s->enc_read_ctx != NULL)
    247 			reuse_dd = 1;
    248 		else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
    249 			goto err;
    250 		else
    251 			/* make sure it's intialized in case we exit later with an error */
    252 			EVP_CIPHER_CTX_init(s->enc_read_ctx);
    253 		dd= s->enc_read_ctx;
    254 
    255 		ssl_replace_hash(&s->read_hash,m);
    256 #ifndef OPENSSL_NO_COMP
    257 		/* COMPRESS */
    258 		if (s->expand != NULL)
    259 			{
    260 			COMP_CTX_free(s->expand);
    261 			s->expand=NULL;
    262 			}
    263 		if (comp != NULL)
    264 			{
    265 			s->expand=COMP_CTX_new(comp);
    266 			if (s->expand == NULL)
    267 				{
    268 				SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
    269 				goto err2;
    270 				}
    271 			if (s->s3->rrec.comp == NULL)
    272 				s->s3->rrec.comp=(unsigned char *)
    273 					OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);
    274 			if (s->s3->rrec.comp == NULL)
    275 				goto err;
    276 			}
    277 #endif
    278 		memset(&(s->s3->read_sequence[0]),0,8);
    279 		mac_secret= &(s->s3->read_mac_secret[0]);
    280 		}
    281 	else
    282 		{
    283 		if (s->enc_write_ctx != NULL)
    284 			reuse_dd = 1;
    285 		else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
    286 			goto err;
    287 		else
    288 			/* make sure it's intialized in case we exit later with an error */
    289 			EVP_CIPHER_CTX_init(s->enc_write_ctx);
    290 		dd= s->enc_write_ctx;
    291 		ssl_replace_hash(&s->write_hash,m);
    292 #ifndef OPENSSL_NO_COMP
    293 		/* COMPRESS */
    294 		if (s->compress != NULL)
    295 			{
    296 			COMP_CTX_free(s->compress);
    297 			s->compress=NULL;
    298 			}
    299 		if (comp != NULL)
    300 			{
    301 			s->compress=COMP_CTX_new(comp);
    302 			if (s->compress == NULL)
    303 				{
    304 				SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
    305 				goto err2;
    306 				}
    307 			}
    308 #endif
    309 		memset(&(s->s3->write_sequence[0]),0,8);
    310 		mac_secret= &(s->s3->write_mac_secret[0]);
    311 		}
    312 
    313 	if (reuse_dd)
    314 		EVP_CIPHER_CTX_cleanup(dd);
    315 
    316 	p=s->s3->tmp.key_block;
    317 	i=EVP_MD_size(m);
    318 	if (i < 0)
    319 		goto err2;
    320 	cl=EVP_CIPHER_key_length(c);
    321 	j=is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
    322 		 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
    323 	/* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */
    324 	k=EVP_CIPHER_iv_length(c);
    325 	if (	(which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
    326 		(which == SSL3_CHANGE_CIPHER_SERVER_READ))
    327 		{
    328 		ms=  &(p[ 0]); n=i+i;
    329 		key= &(p[ n]); n+=j+j;
    330 		iv=  &(p[ n]); n+=k+k;
    331 		er1= &(s->s3->client_random[0]);
    332 		er2= &(s->s3->server_random[0]);
    333 		}
    334 	else
    335 		{
    336 		n=i;
    337 		ms=  &(p[ n]); n+=i+j;
    338 		key= &(p[ n]); n+=j+k;
    339 		iv=  &(p[ n]); n+=k;
    340 		er1= &(s->s3->server_random[0]);
    341 		er2= &(s->s3->client_random[0]);
    342 		}
    343 
    344 	if (n > s->s3->tmp.key_block_length)
    345 		{
    346 		SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
    347 		goto err2;
    348 		}
    349 
    350 	EVP_MD_CTX_init(&md);
    351 	memcpy(mac_secret,ms,i);
    352 	if (is_exp)
    353 		{
    354 		/* In here I set both the read and write key/iv to the
    355 		 * same value since only the correct one will be used :-).
    356 		 */
    357 		EVP_DigestInit_ex(&md,EVP_md5(), NULL);
    358 		EVP_DigestUpdate(&md,key,j);
    359 		EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
    360 		EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
    361 		EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL);
    362 		key= &(exp_key[0]);
    363 
    364 		if (k > 0)
    365 			{
    366 			EVP_DigestInit_ex(&md,EVP_md5(), NULL);
    367 			EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
    368 			EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
    369 			EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL);
    370 			iv= &(exp_iv[0]);
    371 			}
    372 		}
    373 
    374 	s->session->key_arg_length=0;
    375 
    376 	EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
    377 
    378 	OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key));
    379 	OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv));
    380 	EVP_MD_CTX_cleanup(&md);
    381 	return(1);
    382 err:
    383 	SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
    384 err2:
    385 	return(0);
    386 	}
    387 
    388 int ssl3_setup_key_block(SSL *s)
    389 	{
    390 	unsigned char *p;
    391 	const EVP_CIPHER *c;
    392 	const EVP_MD *hash;
    393 	int num;
    394 	int ret = 0;
    395 	SSL_COMP *comp;
    396 
    397 	if (s->s3->tmp.key_block_length != 0)
    398 		return(1);
    399 
    400 	if (!ssl_cipher_get_evp(s->session,&c,&hash,NULL,NULL,&comp))
    401 		{
    402 		SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
    403 		return(0);
    404 		}
    405 
    406 	s->s3->tmp.new_sym_enc=c;
    407 	s->s3->tmp.new_hash=hash;
    408 #ifdef OPENSSL_NO_COMP
    409 	s->s3->tmp.new_compression=NULL;
    410 #else
    411 	s->s3->tmp.new_compression=comp;
    412 #endif
    413 
    414 	num=EVP_MD_size(hash);
    415 	if (num < 0)
    416 		return 0;
    417 
    418 	num=EVP_CIPHER_key_length(c)+num+EVP_CIPHER_iv_length(c);
    419 	num*=2;
    420 
    421 	ssl3_cleanup_key_block(s);
    422 
    423 	if ((p=OPENSSL_malloc(num)) == NULL)
    424 		goto err;
    425 
    426 	s->s3->tmp.key_block_length=num;
    427 	s->s3->tmp.key_block=p;
    428 
    429 	ret = ssl3_generate_key_block(s,p,num);
    430 
    431 	/* enable vulnerability countermeasure for CBC ciphers with
    432 	 * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt) */
    433 	if ((s->mode & SSL_MODE_CBC_RECORD_SPLITTING) != 0)
    434 		{
    435 		s->s3->need_record_splitting = 1;
    436 
    437 		if (s->session->cipher != NULL)
    438 			{
    439 			if (s->session->cipher->algorithm_enc == SSL_eNULL)
    440 				s->s3->need_record_splitting = 0;
    441 
    442 #ifndef OPENSSL_NO_RC4
    443 			if (s->session->cipher->algorithm_enc == SSL_RC4)
    444 				s->s3->need_record_splitting = 0;
    445 #endif
    446 			}
    447 		}
    448 
    449 	return ret;
    450 
    451 err:
    452 	SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
    453 	return(0);
    454 	}
    455 
    456 void ssl3_cleanup_key_block(SSL *s)
    457 	{
    458 	if (s->s3->tmp.key_block != NULL)
    459 		{
    460 		OPENSSL_cleanse(s->s3->tmp.key_block,
    461 			s->s3->tmp.key_block_length);
    462 		OPENSSL_free(s->s3->tmp.key_block);
    463 		s->s3->tmp.key_block=NULL;
    464 		}
    465 	s->s3->tmp.key_block_length=0;
    466 	}
    467 
    468 /* ssl3_enc encrypts/decrypts the record in |s->wrec| / |s->rrec|, respectively.
    469  *
    470  * Returns:
    471  *   0: (in non-constant time) if the record is publically invalid (i.e. too
    472  *       short etc).
    473  *   1: if the record's padding is valid / the encryption was successful.
    474  *   -1: if the record's padding is invalid or, if sending, an internal error
    475  *       occured.
    476  */
    477 int ssl3_enc(SSL *s, int send)
    478 	{
    479 	SSL3_RECORD *rec;
    480 	EVP_CIPHER_CTX *ds;
    481 	unsigned long l;
    482 	int bs,i,mac_size=0;
    483 	const EVP_CIPHER *enc;
    484 
    485 	if (send)
    486 		{
    487 		ds=s->enc_write_ctx;
    488 		rec= &(s->s3->wrec);
    489 		if (s->enc_write_ctx == NULL)
    490 			enc=NULL;
    491 		else
    492 			enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
    493 		}
    494 	else
    495 		{
    496 		ds=s->enc_read_ctx;
    497 		rec= &(s->s3->rrec);
    498 		if (s->enc_read_ctx == NULL)
    499 			enc=NULL;
    500 		else
    501 			enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
    502 		}
    503 
    504 	if ((s->session == NULL) || (ds == NULL) ||
    505 		(enc == NULL))
    506 		{
    507 		memmove(rec->data,rec->input,rec->length);
    508 		rec->input=rec->data;
    509 		}
    510 	else
    511 		{
    512 		l=rec->length;
    513 		bs=EVP_CIPHER_block_size(ds->cipher);
    514 
    515 		/* COMPRESS */
    516 
    517 		if ((bs != 1) && send)
    518 			{
    519 			i=bs-((int)l%bs);
    520 
    521 			/* we need to add 'i-1' padding bytes */
    522 			l+=i;
    523 			/* the last of these zero bytes will be overwritten
    524 			 * with the padding length. */
    525 			memset(&rec->input[rec->length], 0, i);
    526 			rec->length+=i;
    527 			rec->input[l-1]=(i-1);
    528 			}
    529 
    530 		if (!send)
    531 			{
    532 			if (l == 0 || l%bs != 0)
    533 				return 0;
    534 			/* otherwise, rec->length >= bs */
    535 			}
    536 
    537 		EVP_Cipher(ds,rec->data,rec->input,l);
    538 
    539 		if (EVP_MD_CTX_md(s->read_hash) != NULL)
    540 			mac_size = EVP_MD_CTX_size(s->read_hash);
    541 		if ((bs != 1) && !send)
    542 			return ssl3_cbc_remove_padding(s, rec, bs, mac_size);
    543 		}
    544 	return(1);
    545 	}
    546 
    547 void ssl3_init_finished_mac(SSL *s)
    548 	{
    549 	if (s->s3->handshake_buffer) BIO_free(s->s3->handshake_buffer);
    550 	if (s->s3->handshake_dgst) ssl3_free_digest_list(s);
    551     s->s3->handshake_buffer=BIO_new(BIO_s_mem());
    552 	(void)BIO_set_close(s->s3->handshake_buffer,BIO_CLOSE);
    553 	}
    554 
    555 void ssl3_free_digest_list(SSL *s)
    556 	{
    557 	int i;
    558 	if (!s->s3->handshake_dgst) return;
    559 	for (i=0;i<SSL_MAX_DIGEST;i++)
    560 		{
    561 		if (s->s3->handshake_dgst[i])
    562 			EVP_MD_CTX_destroy(s->s3->handshake_dgst[i]);
    563 		}
    564 	OPENSSL_free(s->s3->handshake_dgst);
    565 	s->s3->handshake_dgst=NULL;
    566 	}
    567 
    568 
    569 
    570 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
    571 	{
    572 	if (s->s3->handshake_buffer && !(s->s3->flags & TLS1_FLAGS_KEEP_HANDSHAKE))
    573 		{
    574 		BIO_write (s->s3->handshake_buffer,(void *)buf,len);
    575 		}
    576 	else
    577 		{
    578 		int i;
    579 		for (i=0;i< SSL_MAX_DIGEST;i++)
    580 			{
    581 			if (s->s3->handshake_dgst[i]!= NULL)
    582 			EVP_DigestUpdate(s->s3->handshake_dgst[i],buf,len);
    583 			}
    584 		}
    585 	}
    586 
    587 int ssl3_digest_cached_records(SSL *s)
    588 	{
    589 	int i;
    590 	long mask;
    591 	const EVP_MD *md;
    592 	long hdatalen;
    593 	void *hdata;
    594 
    595 	/* Allocate handshake_dgst array */
    596 	ssl3_free_digest_list(s);
    597 	s->s3->handshake_dgst = OPENSSL_malloc(SSL_MAX_DIGEST * sizeof(EVP_MD_CTX *));
    598 	memset(s->s3->handshake_dgst,0,SSL_MAX_DIGEST *sizeof(EVP_MD_CTX *));
    599 	hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,&hdata);
    600 	if (hdatalen <= 0)
    601 		{
    602 		SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, SSL_R_BAD_HANDSHAKE_LENGTH);
    603 		return 0;
    604 		}
    605 
    606 	/* Loop through bitso of algorithm2 field and create MD_CTX-es */
    607 	for (i=0;ssl_get_handshake_digest(i,&mask,&md); i++)
    608 		{
    609 		if ((mask & ssl_get_algorithm2(s)) && md)
    610 			{
    611 			s->s3->handshake_dgst[i]=EVP_MD_CTX_create();
    612 #ifdef OPENSSL_FIPS
    613 			if (EVP_MD_nid(md) == NID_md5)
    614 				{
    615 				EVP_MD_CTX_set_flags(s->s3->handshake_dgst[i],
    616 						EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
    617 				}
    618 #endif
    619 			EVP_DigestInit_ex(s->s3->handshake_dgst[i],md,NULL);
    620 			EVP_DigestUpdate(s->s3->handshake_dgst[i],hdata,hdatalen);
    621 			}
    622 		else
    623 			{
    624 			s->s3->handshake_dgst[i]=NULL;
    625 			}
    626 		}
    627 	if (!(s->s3->flags & TLS1_FLAGS_KEEP_HANDSHAKE))
    628 		{
    629 		/* Free handshake_buffer BIO */
    630 		BIO_free(s->s3->handshake_buffer);
    631 		s->s3->handshake_buffer = NULL;
    632 		}
    633 
    634 	return 1;
    635 	}
    636 
    637 int ssl3_cert_verify_mac(SSL *s, int md_nid, unsigned char *p)
    638 	{
    639 	return(ssl3_handshake_mac(s,md_nid,NULL,0,p));
    640 	}
    641 int ssl3_final_finish_mac(SSL *s,
    642 	     const char *sender, int len, unsigned char *p)
    643 	{
    644 	int ret, sha1len;
    645 	ret=ssl3_handshake_mac(s,NID_md5,sender,len,p);
    646 	if(ret == 0)
    647 		return 0;
    648 
    649 	p+=ret;
    650 
    651 	sha1len=ssl3_handshake_mac(s,NID_sha1,sender,len,p);
    652 	if(sha1len == 0)
    653 		return 0;
    654 
    655 	ret+=sha1len;
    656 	return(ret);
    657 	}
    658 static int ssl3_handshake_mac(SSL *s, int md_nid,
    659 	     const char *sender, int len, unsigned char *p)
    660 	{
    661 	unsigned int ret;
    662 	int npad,n;
    663 	unsigned int i;
    664 	unsigned char md_buf[EVP_MAX_MD_SIZE];
    665 	EVP_MD_CTX ctx,*d=NULL;
    666 
    667 	if (s->s3->handshake_buffer)
    668 		if (!ssl3_digest_cached_records(s))
    669 			return 0;
    670 
    671 	/* Search for digest of specified type in the handshake_dgst
    672 	 * array*/
    673 	for (i=0;i<SSL_MAX_DIGEST;i++)
    674 		{
    675 		  if (s->s3->handshake_dgst[i]&&EVP_MD_CTX_type(s->s3->handshake_dgst[i])==md_nid)
    676 		  	{
    677 		  	d=s->s3->handshake_dgst[i];
    678 			break;
    679 			}
    680 		}
    681 	if (!d) {
    682 		SSLerr(SSL_F_SSL3_HANDSHAKE_MAC,SSL_R_NO_REQUIRED_DIGEST);
    683 		return 0;
    684 	}
    685 	EVP_MD_CTX_init(&ctx);
    686 	EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
    687 	EVP_MD_CTX_copy_ex(&ctx,d);
    688 	n=EVP_MD_CTX_size(&ctx);
    689 	if (n < 0)
    690 		return 0;
    691 
    692 	npad=(48/n)*n;
    693 	if (sender != NULL)
    694 		EVP_DigestUpdate(&ctx,sender,len);
    695 	EVP_DigestUpdate(&ctx,s->session->master_key,
    696 		s->session->master_key_length);
    697 	EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
    698 	EVP_DigestFinal_ex(&ctx,md_buf,&i);
    699 
    700 	EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL);
    701 	EVP_DigestUpdate(&ctx,s->session->master_key,
    702 		s->session->master_key_length);
    703 	EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
    704 	EVP_DigestUpdate(&ctx,md_buf,i);
    705 	EVP_DigestFinal_ex(&ctx,p,&ret);
    706 
    707 	EVP_MD_CTX_cleanup(&ctx);
    708 
    709 	return((int)ret);
    710 	}
    711 
    712 int n_ssl3_mac(SSL *ssl, unsigned char *md, int send)
    713 	{
    714 	SSL3_RECORD *rec;
    715 	unsigned char *mac_sec,*seq;
    716 	EVP_MD_CTX md_ctx;
    717 	const EVP_MD_CTX *hash;
    718 	unsigned char *p,rec_char;
    719 	size_t md_size, orig_len;
    720 	int npad;
    721 	int t;
    722 
    723 	if (send)
    724 		{
    725 		rec= &(ssl->s3->wrec);
    726 		mac_sec= &(ssl->s3->write_mac_secret[0]);
    727 		seq= &(ssl->s3->write_sequence[0]);
    728 		hash=ssl->write_hash;
    729 		}
    730 	else
    731 		{
    732 		rec= &(ssl->s3->rrec);
    733 		mac_sec= &(ssl->s3->read_mac_secret[0]);
    734 		seq= &(ssl->s3->read_sequence[0]);
    735 		hash=ssl->read_hash;
    736 		}
    737 
    738 	t=EVP_MD_CTX_size(hash);
    739 	if (t < 0 || t > 20)
    740 		return -1;
    741 	md_size=t;
    742 	npad=(48/md_size)*md_size;
    743 
    744 	/* kludge: ssl3_cbc_remove_padding passes padding length in rec->type */
    745 	orig_len = rec->length+md_size+((unsigned int)rec->type>>8);
    746 	rec->type &= 0xff;
    747 
    748 	if (!send &&
    749 	    EVP_CIPHER_CTX_mode(ssl->enc_read_ctx) == EVP_CIPH_CBC_MODE &&
    750 	    ssl3_cbc_record_digest_supported(hash))
    751 		{
    752 		/* This is a CBC-encrypted record. We must avoid leaking any
    753 		 * timing-side channel information about how many blocks of
    754 		 * data we are hashing because that gives an attacker a
    755 		 * timing-oracle. */
    756 
    757 		/* npad is, at most, 48 bytes and that's with MD5:
    758 		 *   16 + 48 + 8 (sequence bytes) + 1 + 2 = 75.
    759 		 *
    760 		 * With SHA-1 (the largest hash speced for SSLv3) the hash size
    761 		 * goes up 4, but npad goes down by 8, resulting in a smaller
    762 		 * total size. */
    763 		unsigned char header[75];
    764 		unsigned j = 0;
    765 		memcpy(header+j, mac_sec, md_size);
    766 		j += md_size;
    767 		memcpy(header+j, ssl3_pad_1, npad);
    768 		j += npad;
    769 		memcpy(header+j, seq, 8);
    770 		j += 8;
    771 		header[j++] = rec->type;
    772 		header[j++] = rec->length >> 8;
    773 		header[j++] = rec->length & 0xff;
    774 
    775 		ssl3_cbc_digest_record(
    776 			hash,
    777 			md, &md_size,
    778 			header, rec->input,
    779 			rec->length + md_size, orig_len,
    780 			mac_sec, md_size,
    781 			1 /* is SSLv3 */);
    782 		}
    783 	else
    784 		{
    785 		unsigned int md_size_u;
    786 		/* Chop the digest off the end :-) */
    787 		EVP_MD_CTX_init(&md_ctx);
    788 
    789 		EVP_MD_CTX_copy_ex( &md_ctx,hash);
    790 		EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
    791 		EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
    792 		EVP_DigestUpdate(&md_ctx,seq,8);
    793 		rec_char=rec->type;
    794 		EVP_DigestUpdate(&md_ctx,&rec_char,1);
    795 		p=md;
    796 		s2n(rec->length,p);
    797 		EVP_DigestUpdate(&md_ctx,md,2);
    798 		EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
    799 		EVP_DigestFinal_ex( &md_ctx,md,NULL);
    800 
    801 		EVP_MD_CTX_copy_ex( &md_ctx,hash);
    802 		EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
    803 		EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
    804 		EVP_DigestUpdate(&md_ctx,md,md_size);
    805 		EVP_DigestFinal_ex( &md_ctx,md,&md_size_u);
    806 		md_size = md_size_u;
    807 
    808 		EVP_MD_CTX_cleanup(&md_ctx);
    809 	}
    810 
    811 	ssl3_record_sequence_update(seq);
    812 	return(md_size);
    813 	}
    814 
    815 void ssl3_record_sequence_update(unsigned char *seq)
    816 	{
    817 	int i;
    818 
    819 	for (i=7; i>=0; i--)
    820 		{
    821 		++seq[i];
    822 		if (seq[i] != 0) break;
    823 		}
    824 	}
    825 
    826 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
    827 	     int len)
    828 	{
    829 	static const unsigned char *salt[3]={
    830 #ifndef CHARSET_EBCDIC
    831 		(const unsigned char *)"A",
    832 		(const unsigned char *)"BB",
    833 		(const unsigned char *)"CCC",
    834 #else
    835 		(const unsigned char *)"\x41",
    836 		(const unsigned char *)"\x42\x42",
    837 		(const unsigned char *)"\x43\x43\x43",
    838 #endif
    839 		};
    840 	unsigned char buf[EVP_MAX_MD_SIZE];
    841 	EVP_MD_CTX ctx;
    842 	int i,ret=0;
    843 	unsigned int n;
    844 
    845 	EVP_MD_CTX_init(&ctx);
    846 	for (i=0; i<3; i++)
    847 		{
    848 		EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL);
    849 		EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
    850 		EVP_DigestUpdate(&ctx,p,len);
    851 		EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
    852 			SSL3_RANDOM_SIZE);
    853 		EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
    854 			SSL3_RANDOM_SIZE);
    855 		EVP_DigestFinal_ex(&ctx,buf,&n);
    856 
    857 		EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL);
    858 		EVP_DigestUpdate(&ctx,p,len);
    859 		EVP_DigestUpdate(&ctx,buf,n);
    860 		EVP_DigestFinal_ex(&ctx,out,&n);
    861 		out+=n;
    862 		ret+=n;
    863 		}
    864 	EVP_MD_CTX_cleanup(&ctx);
    865 	return(ret);
    866 	}
    867 
    868 int ssl3_alert_code(int code)
    869 	{
    870 	switch (code)
    871 		{
    872 	case SSL_AD_CLOSE_NOTIFY:	return(SSL3_AD_CLOSE_NOTIFY);
    873 	case SSL_AD_UNEXPECTED_MESSAGE:	return(SSL3_AD_UNEXPECTED_MESSAGE);
    874 	case SSL_AD_BAD_RECORD_MAC:	return(SSL3_AD_BAD_RECORD_MAC);
    875 	case SSL_AD_DECRYPTION_FAILED:	return(SSL3_AD_BAD_RECORD_MAC);
    876 	case SSL_AD_RECORD_OVERFLOW:	return(SSL3_AD_BAD_RECORD_MAC);
    877 	case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
    878 	case SSL_AD_HANDSHAKE_FAILURE:	return(SSL3_AD_HANDSHAKE_FAILURE);
    879 	case SSL_AD_NO_CERTIFICATE:	return(SSL3_AD_NO_CERTIFICATE);
    880 	case SSL_AD_BAD_CERTIFICATE:	return(SSL3_AD_BAD_CERTIFICATE);
    881 	case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
    882 	case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
    883 	case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
    884 	case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
    885 	case SSL_AD_ILLEGAL_PARAMETER:	return(SSL3_AD_ILLEGAL_PARAMETER);
    886 	case SSL_AD_UNKNOWN_CA:		return(SSL3_AD_BAD_CERTIFICATE);
    887 	case SSL_AD_ACCESS_DENIED:	return(SSL3_AD_HANDSHAKE_FAILURE);
    888 	case SSL_AD_DECODE_ERROR:	return(SSL3_AD_HANDSHAKE_FAILURE);
    889 	case SSL_AD_DECRYPT_ERROR:	return(SSL3_AD_HANDSHAKE_FAILURE);
    890 	case SSL_AD_EXPORT_RESTRICTION:	return(SSL3_AD_HANDSHAKE_FAILURE);
    891 	case SSL_AD_PROTOCOL_VERSION:	return(SSL3_AD_HANDSHAKE_FAILURE);
    892 	case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
    893 	case SSL_AD_INTERNAL_ERROR:	return(SSL3_AD_HANDSHAKE_FAILURE);
    894 	case SSL_AD_USER_CANCELLED:	return(SSL3_AD_HANDSHAKE_FAILURE);
    895 	case SSL_AD_NO_RENEGOTIATION:	return(-1); /* Don't send it :-) */
    896 	case SSL_AD_UNSUPPORTED_EXTENSION: return(SSL3_AD_HANDSHAKE_FAILURE);
    897 	case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(SSL3_AD_HANDSHAKE_FAILURE);
    898 	case SSL_AD_UNRECOGNIZED_NAME:	return(SSL3_AD_HANDSHAKE_FAILURE);
    899 	case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(SSL3_AD_HANDSHAKE_FAILURE);
    900 	case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(SSL3_AD_HANDSHAKE_FAILURE);
    901 	case SSL_AD_UNKNOWN_PSK_IDENTITY:return(TLS1_AD_UNKNOWN_PSK_IDENTITY);
    902 	case SSL_AD_INAPPROPRIATE_FALLBACK:return(TLS1_AD_INAPPROPRIATE_FALLBACK);
    903 	default:			return(-1);
    904 		}
    905 	}
    906