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_set_flags(&m5, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
 150         EVP_MD_CTX_init(&s1);
 151         for (i=0; (int)i<num; i+=MD5_DIGEST_LENGTH)
 152                 {
 153                 k++;
 154                 if (k > sizeof buf)
 155                         {
 156                         /* bug: 'buf' is too small for this ciphersuite */
 157                         SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);
 158                         return 0;
 159                         }
 160
 161                 for (j=0; j<k; j++)
 162                         buf[j]=c;
 163                 c++;
 164                 EVP_DigestInit_ex(&s1,EVP_sha1(), NULL);
 165                 EVP_DigestUpdate(&s1,buf,k);
 166                 EVP_DigestUpdate(&s1,s->session->master_key,
 167                         s->session->master_key_length);
 168                 EVP_DigestUpdate(&s1,s->s3->server_random,SSL3_RANDOM_SIZE);
 169                 EVP_DigestUpdate(&s1,s->s3->client_random,SSL3_RANDOM_SIZE);
 170                 EVP_DigestFinal_ex(&s1,smd,NULL);
 171
 172                 EVP_DigestInit_ex(&m5,EVP_md5(), NULL);
 173                 EVP_DigestUpdate(&m5,s->session->master_key,
 174                         s->session->master_key_length);
 175                 EVP_DigestUpdate(&m5,smd,SHA_DIGEST_LENGTH);
 176                 if ((int)(i+MD5_DIGEST_LENGTH) > num)
 177                         {
 178                         EVP_DigestFinal_ex(&m5,smd,NULL);
 179                         memcpy(km,smd,(num-i));
 180                         }
 181                 else
 182                         EVP_DigestFinal_ex(&m5,km,NULL);
 183
 184                 km+=MD5_DIGEST_LENGTH;
 185                 }
 186         OPENSSL_cleanse(smd,SHA_DIGEST_LENGTH);
 187         EVP_MD_CTX_cleanup(&m5);
 188         EVP_MD_CTX_cleanup(&s1);
 189         return 1;
 190         }
 191
 192 int ssl3_change_cipher_state(SSL *s, int which)
 193         {
 194         unsigned char *p,*key_block,*mac_secret;
 195         unsigned char exp_key[EVP_MAX_KEY_LENGTH];
 196         unsigned char exp_iv[EVP_MAX_IV_LENGTH];
 197         unsigned char *ms,*key,*iv,*er1,*er2;
 198         EVP_CIPHER_CTX *dd;
 199         const EVP_CIPHER *c;
 200 #ifndef OPENSSL_NO_COMP
 201         COMP_METHOD *comp;
 202 #endif
 203         const EVP_MD *m;
 204         EVP_MD_CTX md;
 205         int is_exp,n,i,j,k,cl;
 206         int reuse_dd = 0;
 207
 208         is_exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
 209         c=s->s3->tmp.new_sym_enc;
 210         m=s->s3->tmp.new_hash;
 211 #ifndef OPENSSL_NO_COMP
 212         if (s->s3->tmp.new_compression == NULL)
 213                 comp=NULL;
 214         else
 215                 comp=s->s3->tmp.new_compression->method;
 216 #endif
 217         key_block=s->s3->tmp.key_block;
 218
 219         if (which & SSL3_CC_READ)
 220                 {
 221                 if (s->enc_read_ctx != NULL)
 222                         reuse_dd = 1;
 223                 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 224                         goto err;
 225                 else
 226                         /* make sure it's intialized in case we exit later with an error */
 227                         EVP_CIPHER_CTX_init(s->enc_read_ctx);
 228                 dd= s->enc_read_ctx;
 229                 s->read_hash=m;
 230 #ifndef OPENSSL_NO_COMP
 231                 /* COMPRESS */
 232                 if (s->expand != NULL)
 233                         {
 234                         COMP_CTX_free(s->expand);
 235                         s->expand=NULL;
 236                         }
 237                 if (comp != NULL)
 238                         {
 239                         s->expand=COMP_CTX_new(comp);
 240                         if (s->expand == NULL)
 241                                 {
 242                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 243                                 goto err2;
 244                                 }
 245                         if (s->s3->rrec.comp == NULL)
 246                                 s->s3->rrec.comp=(unsigned char *)
 247                                         OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);
 248                         if (s->s3->rrec.comp == NULL)
 249                                 goto err;
 250                         }
 251 #endif
 252                 memset(&(s->s3->read_sequence[0]),0,8);
 253                 mac_secret= &(s->s3->read_mac_secret[0]);
 254                 }
 255         else
 256                 {
 257                 if (s->enc_write_ctx != NULL)
 258                         reuse_dd = 1;
 259                 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 260                         goto err;
 261                 else
 262                         /* make sure it's intialized in case we exit later with an error */
 263                         EVP_CIPHER_CTX_init(s->enc_write_ctx);
 264                 dd= s->enc_write_ctx;
 265                 s->write_hash=m;
 266 #ifndef OPENSSL_NO_COMP
 267                 /* COMPRESS */
 268                 if (s->compress != NULL)
 269                         {
 270                         COMP_CTX_free(s->compress);
 271                         s->compress=NULL;
 272                         }
 273                 if (comp != NULL)
 274                         {
 275                         s->compress=COMP_CTX_new(comp);
 276                         if (s->compress == NULL)
 277                                 {
 278                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 279                                 goto err2;
 280                                 }
 281                         }
 282 #endif
 283                 memset(&(s->s3->write_sequence[0]),0,8);
 284                 mac_secret= &(s->s3->write_mac_secret[0]);
 285                 }
 286
 287         if (reuse_dd)
 288                 EVP_CIPHER_CTX_cleanup(dd);
 289
 290         p=s->s3->tmp.key_block;
 291         i=EVP_MD_size(m);
 292         cl=EVP_CIPHER_key_length(c);
 293         j=is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
 294                  cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
 295         /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */
 296         k=EVP_CIPHER_iv_length(c);
 297         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 298                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 299                 {
 300                 ms=  &(p[ 0]); n=i+i;
 301                 key= &(p[ n]); n+=j+j;
 302                 iv=  &(p[ n]); n+=k+k;
 303                 er1= &(s->s3->client_random[0]);
 304                 er2= &(s->s3->server_random[0]);
 305                 }
 306         else
 307                 {
 308                 n=i;
 309                 ms=  &(p[ n]); n+=i+j;
 310                 key= &(p[ n]); n+=j+k;
 311                 iv=  &(p[ n]); n+=k;
 312                 er1= &(s->s3->server_random[0]);
 313                 er2= &(s->s3->client_random[0]);
 314                 }
 315
 316         if (n > s->s3->tmp.key_block_length)
 317                 {
 318                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
 319                 goto err2;
 320                 }
 321
 322         EVP_MD_CTX_init(&md);
 323         memcpy(mac_secret,ms,i);
 324         if (is_exp)
 325                 {
 326                 /* In here I set both the read and write key/iv to the
 327                  * same value since only the correct one will be used :-).
 328                  */
 329                 EVP_DigestInit_ex(&md,EVP_md5(), NULL);
 330                 EVP_DigestUpdate(&md,key,j);
 331                 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
 332                 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
 333                 EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL);
 334                 key= &(exp_key[0]);
 335
 336                 if (k > 0)
 337                         {
 338                         EVP_DigestInit_ex(&md,EVP_md5(), NULL);
 339                         EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
 340                         EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
 341                         EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL);
 342                         iv= &(exp_iv[0]);
 343                         }
 344                 }
 345
 346         s->session->key_arg_length=0;
 347
 348         EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
 349
 350         OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key));
 351         OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv));
 352         EVP_MD_CTX_cleanup(&md);
 353         return(1);
 354 err:
 355         SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 356 err2:
 357         return(0);
 358         }
 359
 360 int ssl3_setup_key_block(SSL *s)
 361         {
 362         unsigned char *p;
 363         const EVP_CIPHER *c;
 364         const EVP_MD *hash;
 365         int num;
 366         int ret = 0;
 367         SSL_COMP *comp;
 368
 369         if (s->s3->tmp.key_block_length != 0)
 370                 return(1);
 371
 372         if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
 373                 {
 374                 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 375                 return(0);
 376                 }
 377
 378         s->s3->tmp.new_sym_enc=c;
 379         s->s3->tmp.new_hash=hash;
 380 #ifdef OPENSSL_NO_COMP
 381         s->s3->tmp.new_compression=NULL;
 382 #else
 383         s->s3->tmp.new_compression=comp;
 384 #endif
 385
 386         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
 387         num*=2;
 388
 389         ssl3_cleanup_key_block(s);
 390
 391         if ((p=OPENSSL_malloc(num)) == NULL)
 392                 goto err;
 393
 394         s->s3->tmp.key_block_length=num;
 395         s->s3->tmp.key_block=p;
 396
 397         ret = ssl3_generate_key_block(s,p,num);
 398
 399         if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
 400                 {
 401                 /* enable vulnerability countermeasure for CBC ciphers with
 402                  * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
 403                  */
 404                 s->s3->need_empty_fragments = 1;
 405
 406                 if (s->session->cipher != NULL)
 407                         {
 408                         if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL)
 409                                 s->s3->need_empty_fragments = 0;
 410
 411 #ifndef OPENSSL_NO_RC4
 412                         if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4)
 413                                 s->s3->need_empty_fragments = 0;
 414 #endif
 415                         }
 416                 }
 417
 418         return ret;
 419
 420 err:
 421         SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 422         return(0);
 423         }
 424
 425 void ssl3_cleanup_key_block(SSL *s)
 426         {
 427         if (s->s3->tmp.key_block != NULL)
 428                 {
 429                 OPENSSL_cleanse(s->s3->tmp.key_block,
 430                         s->s3->tmp.key_block_length);
 431                 OPENSSL_free(s->s3->tmp.key_block);
 432                 s->s3->tmp.key_block=NULL;
 433                 }
 434         s->s3->tmp.key_block_length=0;
 435         }
 436
 437 int ssl3_enc(SSL *s, int send)
 438         {
 439         SSL3_RECORD *rec;
 440         EVP_CIPHER_CTX *ds;
 441         unsigned long l;
 442         int bs,i;
 443         const EVP_CIPHER *enc;
 444
 445         if (send)
 446                 {
 447                 ds=s->enc_write_ctx;
 448                 rec= &(s->s3->wrec);
 449                 if (s->enc_write_ctx == NULL)
 450                         enc=NULL;
 451                 else
 452                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 453                 }
 454         else
 455                 {
 456                 ds=s->enc_read_ctx;
 457                 rec= &(s->s3->rrec);
 458                 if (s->enc_read_ctx == NULL)
 459                         enc=NULL;
 460                 else
 461                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 462                 }
 463
 464         if ((s->session == NULL) || (ds == NULL) ||
 465                 (enc == NULL))
 466                 {
 467                 memmove(rec->data,rec->input,rec->length);
 468                 rec->input=rec->data;
 469                 }
 470         else
 471                 {
 472                 l=rec->length;
 473                 bs=EVP_CIPHER_block_size(ds->cipher);
 474
 475                 /* COMPRESS */
 476
 477                 if ((bs != 1) && send)
 478                         {
 479                         i=bs-((int)l%bs);
 480
 481                         /* we need to add 'i-1' padding bytes */
 482                         l+=i;
 483                         rec->length+=i;
 484                         rec->input[l-1]=(i-1);
 485                         }
 486
 487                 if (!send)
 488                         {
 489                         if (l == 0 || l%bs != 0)
 490                                 {
 491                                 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 492                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
 493                                 return 0;
 494                                 }
 495                         /* otherwise, rec->length >= bs */
 496                         }
 497
 498                 EVP_Cipher(ds,rec->data,rec->input,l);
 499
 500                 if ((bs != 1) && !send)
 501                         {
 502                         i=rec->data[l-1]+1;
 503                         /* SSL 3.0 bounds the number of padding bytes by the block size;
 504                          * padding bytes (except the last one) are arbitrary */
 505                         if (i > bs)
 506                                 {
 507                                 /* Incorrect padding. SSLerr() and ssl3_alert are done
 508                                  * by caller: we don't want to reveal whether this is
 509                                  * a decryption error or a MAC verification failure
 510                                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
 511                                 return -1;
 512                                 }
 513                         /* now i <= bs <= rec->length */
 514                         rec->length-=i;
 515                         }
 516                 }
 517         return(1);
 518         }
 519
 520 void ssl3_init_finished_mac(SSL *s)
 521         {
 522         EVP_MD_CTX_set_flags(&(s->s3->finish_dgst1),
 523                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
 524         EVP_DigestInit_ex(&(s->s3->finish_dgst1),s->ctx->md5, NULL);
 525         EVP_DigestInit_ex(&(s->s3->finish_dgst2),s->ctx->sha1, NULL);
 526         }
 527
 528 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
 529         {
 530         EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);
 531         EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);
 532         }
 533
 534 int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p)
 535         {
 536         return(ssl3_handshake_mac(s,ctx,NULL,0,p));
 537         }
 538
 539 int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2,
 540              const char *sender, int len, unsigned char *p)
 541         {
 542         int ret;
 543
 544         ret=ssl3_handshake_mac(s,ctx1,sender,len,p);
 545         p+=ret;
 546         ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);
 547         return(ret);
 548         }
 549
 550 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
 551              const char *sender, int len, unsigned char *p)
 552         {
 553         unsigned int ret;
 554         int npad,n;
 555         unsigned int i;
 556         unsigned char md_buf[EVP_MAX_MD_SIZE];
 557         EVP_MD_CTX ctx;
 558
 559         EVP_MD_CTX_init(&ctx);
 560         EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
 561         EVP_MD_CTX_copy_ex(&ctx,in_ctx);
 562
 563         n=EVP_MD_CTX_size(&ctx);
 564         npad=(48/n)*n;
 565
 566         if (sender != NULL)
 567                 EVP_DigestUpdate(&ctx,sender,len);
 568         EVP_DigestUpdate(&ctx,s->session->master_key,
 569                 s->session->master_key_length);
 570         EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
 571         EVP_DigestFinal_ex(&ctx,md_buf,&i);
 572
 573         EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL);
 574         EVP_DigestUpdate(&ctx,s->session->master_key,
 575                 s->session->master_key_length);
 576         EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
 577         EVP_DigestUpdate(&ctx,md_buf,i);
 578         EVP_DigestFinal_ex(&ctx,p,&ret);
 579
 580         EVP_MD_CTX_cleanup(&ctx);
 581
 582         return((int)ret);
 583         }
 584
 585 int ssl3_mac(SSL *ssl, unsigned char *md, int send)
 586         {
 587         SSL3_RECORD *rec;
 588         unsigned char *mac_sec,*seq;
 589         EVP_MD_CTX md_ctx;
 590         const EVP_MD *hash;
 591         unsigned char *p,rec_char;
 592         unsigned int md_size;
 593         int npad;
 594
 595         if (send)
 596                 {
 597                 rec= &(ssl->s3->wrec);
 598                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 599                 seq= &(ssl->s3->write_sequence[0]);
 600                 hash=ssl->write_hash;
 601                 }
 602         else
 603                 {
 604                 rec= &(ssl->s3->rrec);
 605                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 606                 seq= &(ssl->s3->read_sequence[0]);
 607                 hash=ssl->read_hash;
 608                 }
 609
 610         md_size=EVP_MD_size(hash);
 611         npad=(48/md_size)*md_size;
 612
 613         /* Chop the digest off the end :-) */
 614         EVP_MD_CTX_init(&md_ctx);
 615
 616         EVP_DigestInit_ex(  &md_ctx,hash, NULL);
 617         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 618         EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
 619         EVP_DigestUpdate(&md_ctx,seq,8);
 620         rec_char=rec->type;
 621         EVP_DigestUpdate(&md_ctx,&rec_char,1);
 622         p=md;
 623         s2n(rec->length,p);
 624         EVP_DigestUpdate(&md_ctx,md,2);
 625         EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
 626         EVP_DigestFinal_ex( &md_ctx,md,NULL);
 627
 628         EVP_DigestInit_ex(  &md_ctx,hash, NULL);
 629         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 630         EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
 631         EVP_DigestUpdate(&md_ctx,md,md_size);
 632         EVP_DigestFinal_ex( &md_ctx,md,&md_size);
 633
 634         EVP_MD_CTX_cleanup(&md_ctx);
 635
 636         ssl3_record_sequence_update(seq);
 637         return(md_size);
 638         }
 639
 640 void ssl3_record_sequence_update(unsigned char *seq)
 641         {
 642         int i;
 643
 644         for (i=7; i>=0; i--)
 645                 {
 646                 ++seq[i];
 647                 if (seq[i] != 0) break;
 648                 }
 649         }
 650
 651 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 652              int len)
 653         {
 654         static const unsigned char *salt[3]={
 655 #ifndef CHARSET_EBCDIC
 656                 (const unsigned char *)"A",
 657                 (const unsigned char *)"BB",
 658                 (const unsigned char *)"CCC",
 659 #else
 660                 (const unsigned char *)"\x41",
 661                 (const unsigned char *)"\x42\x42",
 662                 (const unsigned char *)"\x43\x43\x43",
 663 #endif
 664                 };
 665         unsigned char buf[EVP_MAX_MD_SIZE];
 666         EVP_MD_CTX ctx;
 667         int i,ret=0;
 668         unsigned int n;
 669
 670         EVP_MD_CTX_init(&ctx);
 671         for (i=0; i<3; i++)
 672                 {
 673                 EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL);
 674                 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
 675                 EVP_DigestUpdate(&ctx,p,len);
 676                 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
 677                         SSL3_RANDOM_SIZE);
 678                 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
 679                         SSL3_RANDOM_SIZE);
 680                 EVP_DigestFinal_ex(&ctx,buf,&n);
 681
 682                 EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL);
 683                 EVP_DigestUpdate(&ctx,p,len);
 684                 EVP_DigestUpdate(&ctx,buf,n);
 685                 EVP_DigestFinal_ex(&ctx,out,&n);
 686                 out+=n;
 687                 ret+=n;
 688                 }
 689         EVP_MD_CTX_cleanup(&ctx);
 690         return(ret);
 691         }
 692
 693 int ssl3_alert_code(int code)
 694         {
 695         switch (code)
 696                 {
 697         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 698         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 699         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 700         case SSL_AD_DECRYPTION_FAILED:  return(SSL3_AD_BAD_RECORD_MAC);
 701         case SSL_AD_RECORD_OVERFLOW:    return(SSL3_AD_BAD_RECORD_MAC);
 702         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 703         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 704         case SSL_AD_NO_CERTIFICATE:     return(SSL3_AD_NO_CERTIFICATE);
 705         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 706         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 707         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 708         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 709         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 710         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 711         case SSL_AD_UNKNOWN_CA:         return(SSL3_AD_BAD_CERTIFICATE);
 712         case SSL_AD_ACCESS_DENIED:      return(SSL3_AD_HANDSHAKE_FAILURE);
 713         case SSL_AD_DECODE_ERROR:       return(SSL3_AD_HANDSHAKE_FAILURE);
 714         case SSL_AD_DECRYPT_ERROR:      return(SSL3_AD_HANDSHAKE_FAILURE);
 715         case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE);
 716         case SSL_AD_PROTOCOL_VERSION:   return(SSL3_AD_HANDSHAKE_FAILURE);
 717         case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
 718         case SSL_AD_INTERNAL_ERROR:     return(SSL3_AD_HANDSHAKE_FAILURE);
 719         case SSL_AD_USER_CANCELLED:     return(SSL3_AD_HANDSHAKE_FAILURE);
 720         case SSL_AD_NO_RENEGOTIATION:   return(-1); /* Don't send it :-) */
 721         default:                        return(-1);
 722                 }
 723         }
 724