ssl/s3_enc.c

   1 /* ssl/s3_enc.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@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@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@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@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) 1998-2002 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@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@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111
 112 #include <stdio.h>
 113 #include "ssl_locl.h"
 114 #include <openssl/evp.h>
 115 #include <openssl/md5.h>
 116
 117 static unsigned char ssl3_pad_1[48]={
 118         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
 119         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
 120         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
 121         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
 122         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
 123         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36 };
 124
 125 static unsigned char ssl3_pad_2[48]={
 126         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
 127         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
 128         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
 129         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
 130         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
 131         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c };
 132
 133 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
 134         const char *sender, int len, unsigned char *p);
 135
 136 static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num)
 137         {
 138         EVP_MD_CTX m5;
 139         EVP_MD_CTX s1;
 140         unsigned char buf[16],smd[SHA_DIGEST_LENGTH];
 141         unsigned char c='A';
 142         unsigned int i,j,k;
 143
 144 #ifdef CHARSET_EBCDIC
 145         c = os_toascii[c]; /*'A' in ASCII */
 146 #endif
 147         k=0;
 148         EVP_MD_CTX_init(&m5);
 149         EVP_MD_CTX_init(&s1);
 150         for (i=0; (int)i<num; i+=MD5_DIGEST_LENGTH)
 151                 {
 152                 k++;
 153                 if (k > sizeof buf)
 154                         {
 155                         /* bug: 'buf' is too small for this ciphersuite */
 156                         SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);
 157                         return 0;
 158                         }
 159
 160                 for (j=0; j<k; j++)
 161                         buf[j]=c;
 162                 c++;
 163                 EVP_DigestInit_ex(&s1,EVP_sha1(), NULL);
 164                 EVP_DigestUpdate(&s1,buf,k);
 165                 EVP_DigestUpdate(&s1,s->session->master_key,
 166                         s->session->master_key_length);
 167                 EVP_DigestUpdate(&s1,s->s3->server_random,SSL3_RANDOM_SIZE);
 168                 EVP_DigestUpdate(&s1,s->s3->client_random,SSL3_RANDOM_SIZE);
 169                 EVP_DigestFinal_ex(&s1,smd,NULL);
 170
 171                 EVP_DigestInit_ex(&m5,EVP_md5(), NULL);
 172                 EVP_DigestUpdate(&m5,s->session->master_key,
 173                         s->session->master_key_length);
 174                 EVP_DigestUpdate(&m5,smd,SHA_DIGEST_LENGTH);
 175                 if ((int)(i+MD5_DIGEST_LENGTH) > num)
 176                         {
 177                         EVP_DigestFinal_ex(&m5,smd,NULL);
 178                         memcpy(km,smd,(num-i));
 179                         }
 180                 else
 181                         EVP_DigestFinal_ex(&m5,km,NULL);
 182
 183                 km+=MD5_DIGEST_LENGTH;
 184                 }
 185         OPENSSL_cleanse(smd,SHA_DIGEST_LENGTH);
 186         EVP_MD_CTX_cleanup(&m5);
 187         EVP_MD_CTX_cleanup(&s1);
 188         return 1;
 189         }
 190
 191 int ssl3_change_cipher_state(SSL *s, int which)
 192         {
 193         unsigned char *p,*key_block,*mac_secret;
 194         unsigned char exp_key[EVP_MAX_KEY_LENGTH];
 195         unsigned char exp_iv[EVP_MAX_IV_LENGTH];
 196         unsigned char *ms,*key,*iv,*er1,*er2;
 197         EVP_CIPHER_CTX *dd;
 198         const EVP_CIPHER *c;
 199         COMP_METHOD *comp;
 200         const EVP_MD *m;
 201         EVP_MD_CTX md;
 202         int is_exp,n,i,j,k,cl;
 203         int reuse_dd = 0;
 204
 205         is_exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
 206         c=s->s3->tmp.new_sym_enc;
 207         m=s->s3->tmp.new_hash;
 208         if (s->s3->tmp.new_compression == NULL)
 209                 comp=NULL;
 210         else
 211                 comp=s->s3->tmp.new_compression->method;
 212         key_block=s->s3->tmp.key_block;
 213
 214         if (which & SSL3_CC_READ)
 215                 {
 216                 if (s->enc_read_ctx != NULL)
 217                         reuse_dd = 1;
 218                 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 219                         goto err;
 220                 dd= s->enc_read_ctx;
 221                 s->read_hash=m;
 222                 /* COMPRESS */
 223                 if (s->expand != NULL)
 224                         {
 225                         COMP_CTX_free(s->expand);
 226                         s->expand=NULL;
 227                         }
 228                 if (comp != NULL)
 229                         {
 230                         s->expand=COMP_CTX_new(comp);
 231                         if (s->expand == NULL)
 232                                 {
 233                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 234                                 goto err2;
 235                                 }
 236                         if (s->s3->rrec.comp == NULL)
 237                                 s->s3->rrec.comp=(unsigned char *)
 238                                         OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);
 239                         if (s->s3->rrec.comp == NULL)
 240                                 goto err;
 241                         }
 242                 memset(&(s->s3->read_sequence[0]),0,8);
 243                 mac_secret= &(s->s3->read_mac_secret[0]);
 244                 }
 245         else
 246                 {
 247                 if (s->enc_write_ctx != NULL)
 248                         reuse_dd = 1;
 249                 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 250                         goto err;
 251                 dd= s->enc_write_ctx;
 252                 s->write_hash=m;
 253                 /* COMPRESS */
 254                 if (s->compress != NULL)
 255                         {
 256                         COMP_CTX_free(s->compress);
 257                         s->compress=NULL;
 258                         }
 259                 if (comp != NULL)
 260                         {
 261                         s->compress=COMP_CTX_new(comp);
 262                         if (s->compress == NULL)
 263                                 {
 264                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 265                                 goto err2;
 266                                 }
 267                         }
 268                 memset(&(s->s3->write_sequence[0]),0,8);
 269                 mac_secret= &(s->s3->write_mac_secret[0]);
 270                 }
 271
 272         if (reuse_dd)
 273                 EVP_CIPHER_CTX_cleanup(dd);
 274         EVP_CIPHER_CTX_init(dd);
 275
 276         p=s->s3->tmp.key_block;
 277         i=EVP_MD_size(m);
 278         cl=EVP_CIPHER_key_length(c);
 279         j=is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
 280                  cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
 281         /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */
 282         k=EVP_CIPHER_iv_length(c);
 283         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 284                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 285                 {
 286                 ms=  &(p[ 0]); n=i+i;
 287                 key= &(p[ n]); n+=j+j;
 288                 iv=  &(p[ n]); n+=k+k;
 289                 er1= &(s->s3->client_random[0]);
 290                 er2= &(s->s3->server_random[0]);
 291                 }
 292         else
 293                 {
 294                 n=i;
 295                 ms=  &(p[ n]); n+=i+j;
 296                 key= &(p[ n]); n+=j+k;
 297                 iv=  &(p[ n]); n+=k;
 298                 er1= &(s->s3->server_random[0]);
 299                 er2= &(s->s3->client_random[0]);
 300                 }
 301
 302         if (n > s->s3->tmp.key_block_length)
 303                 {
 304                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
 305                 goto err2;
 306                 }
 307
 308         EVP_MD_CTX_init(&md);
 309         memcpy(mac_secret,ms,i);
 310         if (is_exp)
 311                 {
 312                 /* In here I set both the read and write key/iv to the
 313                  * same value since only the correct one will be used :-).
 314                  */
 315                 EVP_DigestInit_ex(&md,EVP_md5(), NULL);
 316                 EVP_DigestUpdate(&md,key,j);
 317                 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
 318                 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
 319                 EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL);
 320                 key= &(exp_key[0]);
 321
 322                 if (k > 0)
 323                         {
 324                         EVP_DigestInit_ex(&md,EVP_md5(), NULL);
 325                         EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
 326                         EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
 327                         EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL);
 328                         iv= &(exp_iv[0]);
 329                         }
 330                 }
 331
 332         s->session->key_arg_length=0;
 333
 334         EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
 335
 336         OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key));
 337         OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv));
 338         EVP_MD_CTX_cleanup(&md);
 339         return(1);
 340 err:
 341         SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 342 err2:
 343         return(0);
 344         }
 345
 346 int ssl3_setup_key_block(SSL *s)
 347         {
 348         unsigned char *p;
 349         const EVP_CIPHER *c;
 350         const EVP_MD *hash;
 351         int num;
 352         int ret = 0;
 353         SSL_COMP *comp;
 354
 355         if (s->s3->tmp.key_block_length != 0)
 356                 return(1);
 357
 358         if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
 359                 {
 360                 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 361                 return(0);
 362                 }
 363
 364         s->s3->tmp.new_sym_enc=c;
 365         s->s3->tmp.new_hash=hash;
 366         s->s3->tmp.new_compression=comp;
 367
 368         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
 369         num*=2;
 370
 371         ssl3_cleanup_key_block(s);
 372
 373         if ((p=OPENSSL_malloc(num)) == NULL)
 374                 goto err;
 375
 376         s->s3->tmp.key_block_length=num;
 377         s->s3->tmp.key_block=p;
 378
 379         ret = ssl3_generate_key_block(s,p,num);
 380
 381         if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
 382                 {
 383                 /* enable vulnerability countermeasure for CBC ciphers with
 384                  * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
 385                  */
 386                 s->s3->need_empty_fragments = 1;
 387
 388                 if (s->session->cipher != NULL)
 389                         {
 390                         if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL)
 391                                 s->s3->need_empty_fragments = 0;
 392
 393 #ifndef OPENSSL_NO_RC4
 394                         if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4)
 395                                 s->s3->need_empty_fragments = 0;
 396 #endif
 397                         }
 398                 }
 399
 400         return ret;
 401
 402 err:
 403         SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 404         return(0);
 405         }
 406
 407 void ssl3_cleanup_key_block(SSL *s)
 408         {
 409         if (s->s3->tmp.key_block != NULL)
 410                 {
 411                 OPENSSL_cleanse(s->s3->tmp.key_block,
 412                         s->s3->tmp.key_block_length);
 413                 OPENSSL_free(s->s3->tmp.key_block);
 414                 s->s3->tmp.key_block=NULL;
 415                 }
 416         s->s3->tmp.key_block_length=0;
 417         }
 418
 419 int ssl3_enc(SSL *s, int send)
 420         {
 421         SSL3_RECORD *rec;
 422         EVP_CIPHER_CTX *ds;
 423         unsigned long l;
 424         int bs,i;
 425         const EVP_CIPHER *enc;
 426
 427         if (send)
 428                 {
 429                 ds=s->enc_write_ctx;
 430                 rec= &(s->s3->wrec);
 431                 if (s->enc_write_ctx == NULL)
 432                         enc=NULL;
 433                 else
 434                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 435                 }
 436         else
 437                 {
 438                 ds=s->enc_read_ctx;
 439                 rec= &(s->s3->rrec);
 440                 if (s->enc_read_ctx == NULL)
 441                         enc=NULL;
 442                 else
 443                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 444                 }
 445
 446         if ((s->session == NULL) || (ds == NULL) ||
 447                 (enc == NULL))
 448                 {
 449                 memmove(rec->data,rec->input,rec->length);
 450                 rec->input=rec->data;
 451                 }
 452         else
 453                 {
 454                 l=rec->length;
 455                 bs=EVP_CIPHER_block_size(ds->cipher);
 456
 457                 /* COMPRESS */
 458
 459                 if ((bs != 1) && send)
 460                         {
 461                         i=bs-((int)l%bs);
 462
 463                         /* we need to add 'i-1' padding bytes */
 464                         l+=i;
 465                         rec->length+=i;
 466                         rec->input[l-1]=(i-1);
 467                         }
 468
 469                 if (!send)
 470                         {
 471                         if (l == 0 || l%bs != 0)
 472                                 {
 473                                 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 474                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
 475                                 return 0;
 476                                 }
 477                         /* otherwise, rec->length >= bs */
 478                         }
 479
 480                 EVP_Cipher(ds,rec->data,rec->input,l);
 481
 482                 if ((bs != 1) && !send)
 483                         {
 484                         i=rec->data[l-1]+1;
 485                         /* SSL 3.0 bounds the number of padding bytes by the block size;
 486                          * padding bytes (except the last one) are arbitrary */
 487                         if (i > bs)
 488                                 {
 489                                 /* Incorrect padding. SSLerr() and ssl3_alert are done
 490                                  * by caller: we don't want to reveal whether this is
 491                                  * a decryption error or a MAC verification failure
 492                                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
 493                                 return -1;
 494                                 }
 495                         /* now i <= bs <= rec->length */
 496                         rec->length-=i;
 497                         }
 498                 }
 499         return(1);
 500         }
 501
 502 void ssl3_init_finished_mac(SSL *s)
 503         {
 504         EVP_DigestInit_ex(&(s->s3->finish_dgst1),s->ctx->md5, NULL);
 505         EVP_DigestInit_ex(&(s->s3->finish_dgst2),s->ctx->sha1, NULL);
 506         }
 507
 508 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
 509         {
 510         EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);
 511         EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);
 512         }
 513
 514 int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p)
 515         {
 516         return(ssl3_handshake_mac(s,ctx,NULL,0,p));
 517         }
 518
 519 int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2,
 520              const char *sender, int len, unsigned char *p)
 521         {
 522         int ret;
 523
 524         ret=ssl3_handshake_mac(s,ctx1,sender,len,p);
 525         p+=ret;
 526         ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);
 527         return(ret);
 528         }
 529
 530 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
 531              const char *sender, int len, unsigned char *p)
 532         {
 533         unsigned int ret;
 534         int npad,n;
 535         unsigned int i;
 536         unsigned char md_buf[EVP_MAX_MD_SIZE];
 537         EVP_MD_CTX ctx;
 538
 539         EVP_MD_CTX_init(&ctx);
 540         EVP_MD_CTX_copy_ex(&ctx,in_ctx);
 541
 542         n=EVP_MD_CTX_size(&ctx);
 543         npad=(48/n)*n;
 544
 545         if (sender != NULL)
 546                 EVP_DigestUpdate(&ctx,sender,len);
 547         EVP_DigestUpdate(&ctx,s->session->master_key,
 548                 s->session->master_key_length);
 549         EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
 550         EVP_DigestFinal_ex(&ctx,md_buf,&i);
 551
 552         EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL);
 553         EVP_DigestUpdate(&ctx,s->session->master_key,
 554                 s->session->master_key_length);
 555         EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
 556         EVP_DigestUpdate(&ctx,md_buf,i);
 557         EVP_DigestFinal_ex(&ctx,p,&ret);
 558
 559         EVP_MD_CTX_cleanup(&ctx);
 560
 561         return((int)ret);
 562         }
 563
 564 int ssl3_mac(SSL *ssl, unsigned char *md, int send)
 565         {
 566         SSL3_RECORD *rec;
 567         unsigned char *mac_sec,*seq;
 568         EVP_MD_CTX md_ctx;
 569         const EVP_MD *hash;
 570         unsigned char *p,rec_char;
 571         unsigned int md_size;
 572         int npad,i;
 573
 574         if (send)
 575                 {
 576                 rec= &(ssl->s3->wrec);
 577                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 578                 seq= &(ssl->s3->write_sequence[0]);
 579                 hash=ssl->write_hash;
 580                 }
 581         else
 582                 {
 583                 rec= &(ssl->s3->rrec);
 584                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 585                 seq= &(ssl->s3->read_sequence[0]);
 586                 hash=ssl->read_hash;
 587                 }
 588
 589         md_size=EVP_MD_size(hash);
 590         npad=(48/md_size)*md_size;
 591
 592         /* Chop the digest off the end :-) */
 593         EVP_MD_CTX_init(&md_ctx);
 594
 595         EVP_DigestInit_ex(  &md_ctx,hash, NULL);
 596         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 597         EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
 598         EVP_DigestUpdate(&md_ctx,seq,8);
 599         rec_char=rec->type;
 600         EVP_DigestUpdate(&md_ctx,&rec_char,1);
 601         p=md;
 602         s2n(rec->length,p);
 603         EVP_DigestUpdate(&md_ctx,md,2);
 604         EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
 605         EVP_DigestFinal_ex( &md_ctx,md,NULL);
 606
 607         EVP_DigestInit_ex(  &md_ctx,hash, NULL);
 608         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 609         EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
 610         EVP_DigestUpdate(&md_ctx,md,md_size);
 611         EVP_DigestFinal_ex( &md_ctx,md,&md_size);
 612
 613         EVP_MD_CTX_cleanup(&md_ctx);
 614
 615         for (i=7; i>=0; i--)
 616                 {
 617                 ++seq[i];
 618                 if (seq[i] != 0) break;
 619                 }
 620
 621         return(md_size);
 622         }
 623
 624 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 625              int len)
 626         {
 627         static const unsigned char *salt[3]={
 628 #ifndef CHARSET_EBCDIC
 629                 (const unsigned char *)"A",
 630                 (const unsigned char *)"BB",
 631                 (const unsigned char *)"CCC",
 632 #else
 633                 (const unsigned char *)"\x41",
 634                 (const unsigned char *)"\x42\x42",
 635                 (const unsigned char *)"\x43\x43\x43",
 636 #endif
 637                 };
 638         unsigned char buf[EVP_MAX_MD_SIZE];
 639         EVP_MD_CTX ctx;
 640         int i,ret=0;
 641         unsigned int n;
 642
 643         EVP_MD_CTX_init(&ctx);
 644         for (i=0; i<3; i++)
 645                 {
 646                 EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL);
 647                 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
 648                 EVP_DigestUpdate(&ctx,p,len);
 649                 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
 650                         SSL3_RANDOM_SIZE);
 651                 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
 652                         SSL3_RANDOM_SIZE);
 653                 EVP_DigestFinal_ex(&ctx,buf,&n);
 654
 655                 EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL);
 656                 EVP_DigestUpdate(&ctx,p,len);
 657                 EVP_DigestUpdate(&ctx,buf,n);
 658                 EVP_DigestFinal_ex(&ctx,out,&n);
 659                 out+=n;
 660                 ret+=n;
 661                 }
 662         EVP_MD_CTX_cleanup(&ctx);
 663         return(ret);
 664         }
 665
 666 int ssl3_alert_code(int code)
 667         {
 668         switch (code)
 669                 {
 670         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 671         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 672         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 673         case SSL_AD_DECRYPTION_FAILED:  return(SSL3_AD_BAD_RECORD_MAC);
 674         case SSL_AD_RECORD_OVERFLOW:    return(SSL3_AD_BAD_RECORD_MAC);
 675         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 676         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 677         case SSL_AD_NO_CERTIFICATE:     return(SSL3_AD_NO_CERTIFICATE);
 678         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 679         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 680         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 681         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 682         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 683         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 684         case SSL_AD_UNKNOWN_CA:         return(SSL3_AD_BAD_CERTIFICATE);
 685         case SSL_AD_ACCESS_DENIED:      return(SSL3_AD_HANDSHAKE_FAILURE);
 686         case SSL_AD_DECODE_ERROR:       return(SSL3_AD_HANDSHAKE_FAILURE);
 687         case SSL_AD_DECRYPT_ERROR:      return(SSL3_AD_HANDSHAKE_FAILURE);
 688         case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE);
 689         case SSL_AD_PROTOCOL_VERSION:   return(SSL3_AD_HANDSHAKE_FAILURE);
 690         case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
 691         case SSL_AD_INTERNAL_ERROR:     return(SSL3_AD_HANDSHAKE_FAILURE);
 692         case SSL_AD_USER_CANCELLED:     return(SSL3_AD_HANDSHAKE_FAILURE);
 693         case SSL_AD_NO_RENEGOTIATION:   return(-1); /* Don't send it :-) */
 694         default:                        return(-1);
 695                 }
 696         }
 697