src/third_party/boringssl/src/ssl/s3_enc.c

   1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   2  * All rights reserved.
   3  *
   4  * This package is an SSL implementation written
   5  * by Eric Young (eay@cryptsoft.com).
   6  * The implementation was written so as to conform with Netscapes SSL.
   7  *g
   8  * This library is free for commercial and non-commercial use as long as
   9  * the following conditions are aheared to.  The following conditions
  10  * apply to all code found in this distribution, be it the RC4, RSA,
  11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  12  * included with this distribution is covered by the same copyright terms
  13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  14  *g
  15  * Copyright remains Eric Young's, and as such any Copyright notices in
  16  * the code are not to be removed.
  17  * If this package is used in a product, Eric Young should be given attribution
  18  * as the author of the parts of the library used.
  19  * This can be in the form of a textual message at program startup or
  20  * in documentation (online or textual) provided with the package.
  21  *g
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. All advertising materials mentioning features or use of this software
  31  *    must display the following acknowledgement:
  32  *    "This product includes cryptographic software written by
  33  *     Eric Young (eay@cryptsoft.com)"
  34  *    The word 'cryptographic' can be left out if the rouines from the library
  35  *    being used are not cryptographic related :-).
  36  * 4. If you include any Windows specific code (or a derivative thereof) fromg
  37  *    the apps directory (application code) you must include an acknowledgement:
  38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  39  *g
  40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  *g
  52  * The licence and distribution terms for any publically available version or
  53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  54  * copied and put under another distribution licence
  55  * [including the GNU Public Licence.]
  56  */
  57 /* ====================================================================
  58  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
  59  *
  60  * Redistribution and use in source and binary forms, with or without
  61  * modification, are permitted provided that the following conditions
  62  * are met:
  63  *
  64  * 1. Redistributions of source code must retain the above copyright
  65  *    notice, this list of conditions and the following disclaimer.g
  66  *
  67  * 2. Redistributions in binary form must reproduce the above copyright
  68  *    notice, this list of conditions and the following disclaimer in
  69  *    the documentation and/or other materials provided with the
  70  *    distribution.
  71  *
  72  * 3. All advertising materials mentioning features or use of this
  73  *    software must display the following acknowledgment:
  74  *    "This product includes software developed by the OpenSSL Project
  75  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  76  *
  77  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  78  *    endorse or promote products derived from this software without
  79  *    prior written permission. For written permission, please contact
  80  *    openssl-core@openssl.org.
  81  *
  82  * 5. Products derived from this software may not be called "OpenSSL"
  83  *    nor may "OpenSSL" appear in their names without prior written
  84  *    permission of the OpenSSL Project.
  85  *
  86  * 6. Redistributions of any form whatsoever must retain the following
  87  *    acknowledgment:
  88  *    "This product includes software developed by the OpenSSL Project
  89  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  90  *
  91  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  92  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  93  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  94  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  95  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  96  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  97  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  98  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  99  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 100  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 101  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 102  * OF THE POSSIBILITY OF SUCH DAMAGE.
 103  * ====================================================================
 104  *
 105  * This product includes cryptographic software written by Eric Young
 106  * (eay@cryptsoft.com).  This product includes software written by Tim
 107  * Hudson (tjh@cryptsoft.com).
 108  *
 109  */
 110 /* ====================================================================
 111  * Copyright 2005 Nokia. All rights reserved.
 112  *
 113  * The portions of the attached software ("Contribution") is developed by
 114  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 115  * license.
 116  *
 117  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 118  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 119  * support (see RFC 4279) to OpenSSL.
 120  *
 121  * No patent licenses or other rights except those expressly stated in
 122  * the OpenSSL open source license shall be deemed granted or received
 123  * expressly, by implication, estoppel, or otherwise.
 124  *
 125  * No assurances are provided by Nokia that the Contribution does not
 126  * infringe the patent or other intellectual property rights of any third
 127  * party or that the license provides you with all the necessary rights
 128  * to make use of the Contribution.
 129  *
 130  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 131  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 132  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 133  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 134  * OTHERWISE. */
 135
 136 #include <stdio.h>
 137 #include <assert.h>
 138
 139 #include <openssl/err.h>
 140 #include <openssl/evp.h>
 141 #include <openssl/mem.h>
 142 #include <openssl/md5.h>
 143 #include <openssl/obj.h>
 144
 145 #include "ssl_locl.h"
 146
 147 static const uint8_t ssl3_pad_1[48]={
 148         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
 149         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
 150         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
 151         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
 152         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
 153         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36 };
 154
 155 static const uint8_t ssl3_pad_2[48]={
 156         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
 157         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
 158         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
 159         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
 160         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
 161         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c };
 162 static int ssl3_handshake_mac(SSL *s, int md_nid,
 163         const char *sender, int len, unsigned char *p);
 164 static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num)
 165         {
 166         EVP_MD_CTX m5;
 167         EVP_MD_CTX s1;
 168         unsigned char buf[16],smd[SHA_DIGEST_LENGTH];
 169         unsigned char c='A';
 170         unsigned int i,j,k;
 171
 172         k=0;
 173         EVP_MD_CTX_init(&m5);
 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                         OPENSSL_PUT_ERROR(SSL, 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;
 222         EVP_CIPHER_CTX *dd;
 223         const EVP_CIPHER *c;
 224         const EVP_MD *m;
 225         int n,i,j,k,cl;
 226         int reuse_dd = 0;
 227
 228         c=s->s3->tmp.new_sym_enc;
 229         m=s->s3->tmp.new_hash;
 230         /* m == NULL will lead to a crash later */
 231         assert(m);
 232
 233         if (which & SSL3_CC_READ)
 234                 {
 235                 if (s->enc_read_ctx != NULL)
 236                         reuse_dd = 1;
 237                 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 238                         goto err;
 239                 else
 240                         /* make sure it's intialized in case we exit later with an error */
 241                         EVP_CIPHER_CTX_init(s->enc_read_ctx);
 242                 dd= s->enc_read_ctx;
 243
 244                 ssl_replace_hash(&s->read_hash,m);
 245                 memset(&(s->s3->read_sequence[0]),0,8);
 246                 mac_secret= &(s->s3->read_mac_secret[0]);
 247                 }
 248         else
 249                 {
 250                 if (s->enc_write_ctx != NULL)
 251                         reuse_dd = 1;
 252                 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 253                         goto err;
 254                 else
 255                         /* make sure it's intialized in case we exit later with an error */
 256                         EVP_CIPHER_CTX_init(s->enc_write_ctx);
 257                 dd= s->enc_write_ctx;
 258                 ssl_replace_hash(&s->write_hash,m);
 259                 memset(&(s->s3->write_sequence[0]),0,8);
 260                 mac_secret= &(s->s3->write_mac_secret[0]);
 261                 }
 262
 263         if (reuse_dd)
 264                 EVP_CIPHER_CTX_cleanup(dd);
 265
 266         p=s->s3->tmp.key_block;
 267         i=EVP_MD_size(m);
 268         cl=EVP_CIPHER_key_length(c);
 269         j = cl;
 270         /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */
 271         k=EVP_CIPHER_iv_length(c);
 272         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 273                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 274                 {
 275                 ms=  &(p[ 0]); n=i+i;
 276                 key= &(p[ n]); n+=j+j;
 277                 iv=  &(p[ n]); n+=k+k;
 278                 }
 279         else
 280                 {
 281                 n=i;
 282                 ms=  &(p[ n]); n+=i+j;
 283                 key= &(p[ n]); n+=j+k;
 284                 iv=  &(p[ n]); n+=k;
 285                 }
 286
 287         if (n > s->s3->tmp.key_block_length)
 288                 {
 289                 OPENSSL_PUT_ERROR(SSL, ssl3_change_cipher_state, ERR_R_INTERNAL_ERROR);
 290                 goto err2;
 291                 }
 292
 293         memcpy(mac_secret,ms,i);
 294
 295         s->session->key_arg_length=0;
 296
 297         EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
 298
 299 #ifdef OPENSSL_SSL_TRACE_CRYPTO
 300         if (s->msg_callback)
 301                 {
 302
 303                 int wh = which & SSL3_CC_WRITE ?
 304                                 TLS1_RT_CRYPTO_WRITE : TLS1_RT_CRYPTO_READ;
 305                 s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_MAC,
 306                                                 mac_secret, EVP_MD_size(m),
 307                                                 s, s->msg_callback_arg);
 308                 if (c->key_len)
 309                         s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_KEY,
 310                                                 key, c->key_len,
 311                                                 s, s->msg_callback_arg);
 312                 if (k)
 313                         {
 314                         s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_IV,
 315                                                 iv, k, s, s->msg_callback_arg);
 316                         }
 317                 }
 318 #endif
 319
 320         OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key));
 321         OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv));
 322         return(1);
 323 err:
 324         OPENSSL_PUT_ERROR(SSL, ssl3_change_cipher_state, ERR_R_MALLOC_FAILURE);
 325 err2:
 326         return(0);
 327         }
 328
 329 int ssl3_setup_key_block(SSL *s)
 330         {
 331         unsigned char *p;
 332         const EVP_CIPHER *c;
 333         const EVP_MD *hash;
 334         size_t num;
 335         int ret = 0;
 336
 337         if (s->s3->tmp.key_block_length != 0)
 338                 return(1);
 339
 340         if (!ssl_cipher_get_evp(s->session,&c,&hash,NULL,NULL))
 341                 {
 342                 OPENSSL_PUT_ERROR(SSL, ssl3_setup_key_block, SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 343                 return(0);
 344                 }
 345
 346         s->s3->tmp.new_sym_enc=c;
 347         s->s3->tmp.new_hash=hash;
 348
 349         num=EVP_MD_size(hash);
 350
 351         num=EVP_CIPHER_key_length(c)+num+EVP_CIPHER_iv_length(c);
 352         num*=2;
 353
 354         ssl3_cleanup_key_block(s);
 355
 356         if ((p=OPENSSL_malloc(num)) == NULL)
 357                 goto err;
 358
 359         s->s3->tmp.key_block_length=num;
 360         s->s3->tmp.key_block=p;
 361
 362         ret = ssl3_generate_key_block(s,p,num);
 363
 364         /* enable vulnerability countermeasure for CBC ciphers with
 365          * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt) */
 366         if ((s->mode & SSL_MODE_CBC_RECORD_SPLITTING) != 0)
 367                 {
 368                 s->s3->need_record_splitting = 1;
 369
 370                 if (s->session->cipher != NULL)
 371                         {
 372                         if (s->session->cipher->algorithm_enc == SSL_RC4)
 373                                 s->s3->need_record_splitting = 0;
 374                         }
 375                 }
 376
 377         return ret;
 378
 379 err:
 380         OPENSSL_PUT_ERROR(SSL, ssl3_setup_key_block, ERR_R_MALLOC_FAILURE);
 381         return(0);
 382         }
 383
 384 void ssl3_cleanup_key_block(SSL *s)
 385         {
 386         if (s->s3->tmp.key_block != NULL)
 387                 {
 388                 OPENSSL_cleanse(s->s3->tmp.key_block,
 389                         s->s3->tmp.key_block_length);
 390                 OPENSSL_free(s->s3->tmp.key_block);
 391                 s->s3->tmp.key_block=NULL;
 392                 }
 393         s->s3->tmp.key_block_length=0;
 394         }
 395
 396 /* ssl3_enc encrypts/decrypts the record in |s->wrec| / |s->rrec|, respectively.
 397  *
 398  * Returns:
 399  *   0: (in non-constant time) if the record is publically invalid (i.e. too
 400  *       short etc).
 401  *   1: if the record's padding is valid / the encryption was successful.
 402  *   -1: if the record's padding is invalid or, if sending, an internal error
 403  *       occured.
 404  */
 405 int ssl3_enc(SSL *s, int send)
 406         {
 407         SSL3_RECORD *rec;
 408         EVP_CIPHER_CTX *ds;
 409         unsigned long l;
 410         int bs,i,mac_size=0;
 411         const EVP_CIPHER *enc;
 412
 413         if (send)
 414                 {
 415                 ds=s->enc_write_ctx;
 416                 rec= &(s->s3->wrec);
 417                 if (s->enc_write_ctx == NULL)
 418                         enc=NULL;
 419                 else
 420                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 421                 }
 422         else
 423                 {
 424                 ds=s->enc_read_ctx;
 425                 rec= &(s->s3->rrec);
 426                 if (s->enc_read_ctx == NULL)
 427                         enc=NULL;
 428                 else
 429                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 430                 }
 431
 432         if ((s->session == NULL) || (ds == NULL) ||
 433                 (enc == NULL))
 434                 {
 435                 memmove(rec->data,rec->input,rec->length);
 436                 rec->input=rec->data;
 437                 }
 438         else
 439                 {
 440                 l=rec->length;
 441                 bs=EVP_CIPHER_block_size(ds->cipher);
 442
 443                 /* COMPRESS */
 444
 445                 if ((bs != 1) && send)
 446                         {
 447                         i=bs-((int)l%bs);
 448
 449                         /* we need to add 'i-1' padding bytes */
 450                         l+=i;
 451                         /* the last of these zero bytes will be overwritten
 452                          * with the padding length. */
 453                         memset(&rec->input[rec->length], 0, i);
 454                         rec->length+=i;
 455                         rec->input[l-1]=(i-1);
 456                         }
 457
 458                 if (!send)
 459                         {
 460                         if (l == 0 || l%bs != 0)
 461                                 return 0;
 462                         /* otherwise, rec->length >= bs */
 463                         }
 464
 465                 EVP_Cipher(ds,rec->data,rec->input,l);
 466
 467                 if (EVP_MD_CTX_md(s->read_hash) != NULL)
 468                         mac_size = EVP_MD_CTX_size(s->read_hash);
 469                 if ((bs != 1) && !send)
 470                         return ssl3_cbc_remove_padding(s, rec, bs, mac_size);
 471                 }
 472         return(1);
 473         }
 474
 475 void ssl3_init_finished_mac(SSL *s)
 476         {
 477         if (s->s3->handshake_buffer) BIO_free(s->s3->handshake_buffer);
 478         if (s->s3->handshake_dgst) ssl3_free_digest_list(s);
 479     s->s3->handshake_buffer=BIO_new(BIO_s_mem());
 480         (void)BIO_set_close(s->s3->handshake_buffer,BIO_CLOSE);
 481         }
 482
 483 void ssl3_free_digest_list(SSL *s)
 484         {
 485         int i;
 486         if (!s->s3->handshake_dgst) return;
 487         for (i=0;i<SSL_MAX_DIGEST;i++)
 488                 {
 489                 if (s->s3->handshake_dgst[i])
 490                         EVP_MD_CTX_destroy(s->s3->handshake_dgst[i]);
 491                 }
 492         OPENSSL_free(s->s3->handshake_dgst);
 493         s->s3->handshake_dgst=NULL;
 494         }
 495
 496
 497
 498 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
 499         {
 500         if (s->s3->handshake_buffer)
 501                 {
 502                 BIO_write (s->s3->handshake_buffer,(void *)buf,len);
 503                 }
 504         else
 505                 {
 506                 int i;
 507                 for (i=0;i< SSL_MAX_DIGEST;i++)
 508                         {
 509                         if (s->s3->handshake_dgst[i]!= NULL)
 510                         EVP_DigestUpdate(s->s3->handshake_dgst[i],buf,len);
 511                         }
 512                 }
 513         }
 514
 515 int ssl3_digest_cached_records(SSL *s)
 516         {
 517         int i;
 518         long mask;
 519         const EVP_MD *md;
 520         const uint8_t *hdata;
 521         size_t hdatalen;
 522
 523         /* Allocate handshake_dgst array */
 524         ssl3_free_digest_list(s);
 525         s->s3->handshake_dgst = OPENSSL_malloc(SSL_MAX_DIGEST * sizeof(EVP_MD_CTX *));
 526         memset(s->s3->handshake_dgst,0,SSL_MAX_DIGEST *sizeof(EVP_MD_CTX *));
 527         if (!BIO_mem_contents(s->s3->handshake_buffer, &hdata, &hdatalen))
 528                 {
 529                 OPENSSL_PUT_ERROR(SSL, ssl3_digest_cached_records, SSL_R_BAD_HANDSHAKE_LENGTH);
 530                 return 0;
 531                 }
 532
 533         /* Loop through bitso of algorithm2 field and create MD_CTX-es */
 534         for (i=0;ssl_get_handshake_digest(i,&mask,&md); i++)
 535                 {
 536                 if ((mask & ssl_get_algorithm2(s)) && md)
 537                         {
 538                         s->s3->handshake_dgst[i]=EVP_MD_CTX_create();
 539                         EVP_DigestInit_ex(s->s3->handshake_dgst[i],md,NULL);
 540                         EVP_DigestUpdate(s->s3->handshake_dgst[i],hdata,hdatalen);
 541                         }
 542                 else
 543                         {
 544                         s->s3->handshake_dgst[i]=NULL;
 545                         }
 546                 }
 547         /* Free handshake_buffer BIO */
 548         BIO_free(s->s3->handshake_buffer);
 549         s->s3->handshake_buffer = NULL;
 550
 551         return 1;
 552         }
 553
 554 int ssl3_cert_verify_mac(SSL *s, int md_nid, unsigned char *p)
 555         {
 556         return(ssl3_handshake_mac(s,md_nid,NULL,0,p));
 557         }
 558 int ssl3_final_finish_mac(SSL *s,
 559              const char *sender, int len, unsigned char *p)
 560         {
 561         int ret, sha1len;
 562         ret=ssl3_handshake_mac(s,NID_md5,sender,len,p);
 563         if(ret == 0)
 564                 return 0;
 565
 566         p+=ret;
 567
 568         sha1len=ssl3_handshake_mac(s,NID_sha1,sender,len,p);
 569         if(sha1len == 0)
 570                 return 0;
 571
 572         ret+=sha1len;
 573         return(ret);
 574         }
 575
 576 static int ssl3_handshake_mac(SSL *s, int md_nid,
 577              const char *sender, int len, unsigned char *p)
 578         {
 579         unsigned int ret;
 580         int npad,n;
 581         unsigned int i;
 582         unsigned char md_buf[EVP_MAX_MD_SIZE];
 583         EVP_MD_CTX ctx,*d=NULL;
 584
 585         if (s->s3->handshake_buffer)
 586                 if (!ssl3_digest_cached_records(s))
 587                         return 0;
 588
 589         /* Search for digest of specified type in the handshake_dgst
 590          * array*/
 591         for (i=0;i<SSL_MAX_DIGEST;i++)
 592                 {
 593                   if (s->s3->handshake_dgst[i]&&EVP_MD_CTX_type(s->s3->handshake_dgst[i])==md_nid)
 594                         {
 595                         d=s->s3->handshake_dgst[i];
 596                         break;
 597                         }
 598                 }
 599         if (!d) {
 600                 OPENSSL_PUT_ERROR(SSL, ssl3_handshake_mac, SSL_R_NO_REQUIRED_DIGEST);
 601                 return 0;
 602         }
 603         EVP_MD_CTX_init(&ctx);
 604         EVP_MD_CTX_copy_ex(&ctx,d);
 605         n=EVP_MD_CTX_size(&ctx);
 606         if (n < 0)
 607                 return 0;
 608
 609         npad=(48/n)*n;
 610         if (sender != NULL)
 611                 EVP_DigestUpdate(&ctx,sender,len);
 612         EVP_DigestUpdate(&ctx,s->session->master_key,
 613                 s->session->master_key_length);
 614         EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
 615         EVP_DigestFinal_ex(&ctx,md_buf,&i);
 616
 617         EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL);
 618         EVP_DigestUpdate(&ctx,s->session->master_key,
 619                 s->session->master_key_length);
 620         EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
 621         EVP_DigestUpdate(&ctx,md_buf,i);
 622         EVP_DigestFinal_ex(&ctx,p,&ret);
 623
 624         EVP_MD_CTX_cleanup(&ctx);
 625
 626         return((int)ret);
 627         }
 628
 629 int n_ssl3_mac(SSL *ssl, unsigned char *md, int send)
 630         {
 631         SSL3_RECORD *rec;
 632         unsigned char *mac_sec,*seq;
 633         EVP_MD_CTX md_ctx;
 634         const EVP_MD_CTX *hash;
 635         unsigned char *p,rec_char;
 636         size_t md_size, orig_len;
 637         int npad;
 638         int t;
 639
 640         if (send)
 641                 {
 642                 rec= &(ssl->s3->wrec);
 643                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 644                 seq= &(ssl->s3->write_sequence[0]);
 645                 hash=ssl->write_hash;
 646                 }
 647         else
 648                 {
 649                 rec= &(ssl->s3->rrec);
 650                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 651                 seq= &(ssl->s3->read_sequence[0]);
 652                 hash=ssl->read_hash;
 653                 }
 654
 655         t=EVP_MD_CTX_size(hash);
 656         if (t < 0 || t > 20)
 657                 return -1;
 658         md_size=t;
 659         npad=(48/md_size)*md_size;
 660
 661         /* kludge: ssl3_cbc_remove_padding passes padding length in rec->type */
 662         orig_len = rec->length+md_size+((unsigned int)rec->type>>8);
 663         rec->type &= 0xff;
 664
 665         if (!send &&
 666             EVP_CIPHER_CTX_mode(ssl->enc_read_ctx) == EVP_CIPH_CBC_MODE &&
 667             ssl3_cbc_record_digest_supported(hash))
 668                 {
 669                 /* This is a CBC-encrypted record. We must avoid leaking any
 670                  * timing-side channel information about how many blocks of
 671                  * data we are hashing because that gives an attacker a
 672                  * timing-oracle. */
 673
 674                 /* npad is, at most, 48 bytes and that's with MD5:
 675                  *   16 + 48 + 8 (sequence bytes) + 1 + 2 = 75.
 676                  *
 677                  * With SHA-1 (the largest hash speced for SSLv3) the hash size
 678                  * goes up 4, but npad goes down by 8, resulting in a smaller
 679                  * total size. */
 680                 unsigned char header[75];
 681                 unsigned j = 0;
 682                 memcpy(header+j, mac_sec, md_size);
 683                 j += md_size;
 684                 memcpy(header+j, ssl3_pad_1, npad);
 685                 j += npad;
 686                 memcpy(header+j, seq, 8);
 687                 j += 8;
 688                 header[j++] = rec->type;
 689                 header[j++] = rec->length >> 8;
 690                 header[j++] = rec->length & 0xff;
 691
 692                 ssl3_cbc_digest_record(
 693                         hash,
 694                         md, &md_size,
 695                         header, rec->input,
 696                         rec->length + md_size, orig_len,
 697                         mac_sec, md_size,
 698                         1 /* is SSLv3 */);
 699                 }
 700         else
 701                 {
 702                 unsigned int md_size_u;
 703                 /* Chop the digest off the end :-) */
 704                 EVP_MD_CTX_init(&md_ctx);
 705
 706                 EVP_MD_CTX_copy_ex( &md_ctx,hash);
 707                 EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 708                 EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
 709                 EVP_DigestUpdate(&md_ctx,seq,8);
 710                 rec_char=rec->type;
 711                 EVP_DigestUpdate(&md_ctx,&rec_char,1);
 712                 p=md;
 713                 s2n(rec->length,p);
 714                 EVP_DigestUpdate(&md_ctx,md,2);
 715                 EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
 716                 EVP_DigestFinal_ex( &md_ctx,md,NULL);
 717
 718                 EVP_MD_CTX_copy_ex( &md_ctx,hash);
 719                 EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 720                 EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
 721                 EVP_DigestUpdate(&md_ctx,md,md_size);
 722                 EVP_DigestFinal_ex( &md_ctx,md,&md_size_u);
 723                 md_size = md_size_u;
 724
 725                 EVP_MD_CTX_cleanup(&md_ctx);
 726         }
 727
 728         ssl3_record_sequence_update(seq);
 729         return(md_size);
 730         }
 731
 732 void ssl3_record_sequence_update(unsigned char *seq)
 733         {
 734         int i;
 735
 736         for (i=7; i>=0; i--)
 737                 {
 738                 ++seq[i];
 739                 if (seq[i] != 0) break;
 740                 }
 741         }
 742
 743 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 744              int len)
 745         {
 746         static const unsigned char *salt[3]={
 747                 (const unsigned char *)"A",
 748                 (const unsigned char *)"BB",
 749                 (const unsigned char *)"CCC",
 750                 };
 751         unsigned char buf[EVP_MAX_MD_SIZE];
 752         EVP_MD_CTX ctx;
 753         int i,ret=0;
 754         unsigned int n;
 755 #ifdef OPENSSL_SSL_TRACE_CRYPTO
 756         unsigned char *tmpout = out;
 757 #endif
 758
 759         EVP_MD_CTX_init(&ctx);
 760         for (i=0; i<3; i++)
 761                 {
 762                 EVP_DigestInit_ex(&ctx, EVP_sha1(), NULL);
 763                 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
 764                 EVP_DigestUpdate(&ctx,p,len);
 765                 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
 766                         SSL3_RANDOM_SIZE);
 767                 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
 768                         SSL3_RANDOM_SIZE);
 769                 EVP_DigestFinal_ex(&ctx,buf,&n);
 770
 771                 EVP_DigestInit_ex(&ctx, EVP_md5(), NULL);
 772                 EVP_DigestUpdate(&ctx,p,len);
 773                 EVP_DigestUpdate(&ctx,buf,n);
 774                 EVP_DigestFinal_ex(&ctx,out,&n);
 775                 out+=n;
 776                 ret+=n;
 777                 }
 778         EVP_MD_CTX_cleanup(&ctx);
 779
 780 #ifdef OPENSSL_SSL_TRACE_CRYPTO
 781         if (s->msg_callback)
 782                 {
 783                 s->msg_callback(2, s->version, TLS1_RT_CRYPTO_PREMASTER,
 784                                                 p, len, s, s->msg_callback_arg);
 785                 s->msg_callback(2, s->version, TLS1_RT_CRYPTO_CLIENT_RANDOM,
 786                                         s->s3->client_random, SSL3_RANDOM_SIZE,
 787                                                 s, s->msg_callback_arg);
 788                 s->msg_callback(2, s->version, TLS1_RT_CRYPTO_SERVER_RANDOM,
 789                                         s->s3->server_random, SSL3_RANDOM_SIZE,
 790                                         s, s->msg_callback_arg);
 791                 s->msg_callback(2, s->version, TLS1_RT_CRYPTO_MASTER,
 792                                         tmpout, SSL3_MASTER_SECRET_SIZE,
 793                                         s, s->msg_callback_arg);
 794                 }
 795 #endif
 796         return(ret);
 797         }
 798
 799 int ssl3_alert_code(int code)
 800         {
 801         switch (code)
 802                 {
 803         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 804         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 805         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 806         case SSL_AD_DECRYPTION_FAILED:  return(SSL3_AD_BAD_RECORD_MAC);
 807         case SSL_AD_RECORD_OVERFLOW:    return(SSL3_AD_BAD_RECORD_MAC);
 808         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 809         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 810         case SSL_AD_NO_CERTIFICATE:     return(SSL3_AD_NO_CERTIFICATE);
 811         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 812         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 813         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 814         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 815         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 816         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 817         case SSL_AD_UNKNOWN_CA:         return(SSL3_AD_BAD_CERTIFICATE);
 818         case SSL_AD_ACCESS_DENIED:      return(SSL3_AD_HANDSHAKE_FAILURE);
 819         case SSL_AD_DECODE_ERROR:       return(SSL3_AD_HANDSHAKE_FAILURE);
 820         case SSL_AD_DECRYPT_ERROR:      return(SSL3_AD_HANDSHAKE_FAILURE);
 821         case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE);
 822         case SSL_AD_PROTOCOL_VERSION:   return(SSL3_AD_HANDSHAKE_FAILURE);
 823         case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
 824         case SSL_AD_INTERNAL_ERROR:     return(SSL3_AD_HANDSHAKE_FAILURE);
 825         case SSL_AD_USER_CANCELLED:     return(SSL3_AD_HANDSHAKE_FAILURE);
 826         case SSL_AD_NO_RENEGOTIATION:   return(-1); /* Don't send it :-) */
 827         case SSL_AD_UNSUPPORTED_EXTENSION: return(SSL3_AD_HANDSHAKE_FAILURE);
 828         case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(SSL3_AD_HANDSHAKE_FAILURE);
 829         case SSL_AD_UNRECOGNIZED_NAME:  return(SSL3_AD_HANDSHAKE_FAILURE);
 830         case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(SSL3_AD_HANDSHAKE_FAILURE);
 831         case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(SSL3_AD_HANDSHAKE_FAILURE);
 832         case SSL_AD_UNKNOWN_PSK_IDENTITY:return(TLS1_AD_UNKNOWN_PSK_IDENTITY);
 833         case SSL_AD_INAPPROPRIATE_FALLBACK:return(SSL3_AD_INAPPROPRIATE_FALLBACK);
 834         default:                        return(-1);
 835                 }
 836         }
 837