ssl/t1_enc.c

   1 /* ssl/t1_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 #include <stdio.h>
  60 #include <openssl/comp.h>
  61 #include <openssl/md5.h>
  62 #include <openssl/sha.h>
  63 #include <openssl/evp.h>
  64 #include <openssl/hmac.h>
  65 #include "ssl_locl.h"
  66
  67 static void tls1_P_hash(const EVP_MD *md, const unsigned char *sec,
  68                         int sec_len, unsigned char *seed, int seed_len,
  69                         unsigned char *out, int olen)
  70         {
  71         int chunk,n;
  72         unsigned int j;
  73         HMAC_CTX ctx;
  74         HMAC_CTX ctx_tmp;
  75         unsigned char A1[HMAC_MAX_MD_CBLOCK];
  76         unsigned int A1_len;
  77
  78         chunk=EVP_MD_size(md);
  79
  80         HMAC_Init(&ctx,sec,sec_len,md);
  81         HMAC_Update(&ctx,seed,seed_len);
  82         HMAC_Final(&ctx,A1,&A1_len);
  83
  84         n=0;
  85         for (;;)
  86                 {
  87                 HMAC_Init(&ctx,NULL,0,NULL); /* re-init */
  88                 HMAC_Update(&ctx,A1,A1_len);
  89                 memcpy(&ctx_tmp,&ctx,sizeof(ctx)); /* Copy for A2 */ /* not needed for last one */
  90                 HMAC_Update(&ctx,seed,seed_len);
  91
  92                 if (olen > chunk)
  93                         {
  94                         HMAC_Final(&ctx,out,&j);
  95                         out+=j;
  96                         olen-=j;
  97                         HMAC_Final(&ctx_tmp,A1,&A1_len); /* calc the next A1 value */
  98                         }
  99                 else    /* last one */
 100                         {
 101                         HMAC_Final(&ctx,A1,&A1_len);
 102                         memcpy(out,A1,olen);
 103                         break;
 104                         }
 105                 }
 106         HMAC_cleanup(&ctx);
 107         HMAC_cleanup(&ctx_tmp);
 108         memset(A1,0,sizeof(A1));
 109         }
 110
 111 static void tls1_PRF(const EVP_MD *md5, const EVP_MD *sha1,
 112                      unsigned char *label, int label_len,
 113                      const unsigned char *sec, int slen, unsigned char *out1,
 114                      unsigned char *out2, int olen)
 115         {
 116         int len,i;
 117         const unsigned char *S1,*S2;
 118
 119         len=slen/2;
 120         S1=sec;
 121         S2= &(sec[len]);
 122         len+=(slen&1); /* add for odd, make longer */
 123
 124
 125         tls1_P_hash(md5 ,S1,len,label,label_len,out1,olen);
 126         tls1_P_hash(sha1,S2,len,label,label_len,out2,olen);
 127
 128         for (i=0; i<olen; i++)
 129                 out1[i]^=out2[i];
 130         }
 131
 132 static void tls1_generate_key_block(SSL *s, unsigned char *km,
 133              unsigned char *tmp, int num)
 134         {
 135         unsigned char *p;
 136         unsigned char buf[SSL3_RANDOM_SIZE*2+
 137                 TLS_MD_MAX_CONST_SIZE];
 138         p=buf;
 139
 140         memcpy(p,TLS_MD_KEY_EXPANSION_CONST,
 141                 TLS_MD_KEY_EXPANSION_CONST_SIZE);
 142         p+=TLS_MD_KEY_EXPANSION_CONST_SIZE;
 143         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 144         p+=SSL3_RANDOM_SIZE;
 145         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 146         p+=SSL3_RANDOM_SIZE;
 147
 148         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),
 149                  s->session->master_key,s->session->master_key_length,
 150                  km,tmp,num);
 151         }
 152
 153 int tls1_change_cipher_state(SSL *s, int which)
 154         {
 155         static const unsigned char empty[]="";
 156         unsigned char *p,*key_block,*mac_secret;
 157         unsigned char *exp_label,buf[TLS_MD_MAX_CONST_SIZE+
 158                 SSL3_RANDOM_SIZE*2];
 159         unsigned char tmp1[EVP_MAX_KEY_LENGTH];
 160         unsigned char tmp2[EVP_MAX_KEY_LENGTH];
 161         unsigned char iv1[EVP_MAX_IV_LENGTH*2];
 162         unsigned char iv2[EVP_MAX_IV_LENGTH*2];
 163         unsigned char *ms,*key,*iv,*er1,*er2;
 164         int client_write;
 165         EVP_CIPHER_CTX *dd;
 166         const EVP_CIPHER *c;
 167         const SSL_COMP *comp;
 168         const EVP_MD *m;
 169         int _exp,n,i,j,k,exp_label_len,cl;
 170
 171         _exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
 172         c=s->s3->tmp.new_sym_enc;
 173         m=s->s3->tmp.new_hash;
 174         comp=s->s3->tmp.new_compression;
 175         key_block=s->s3->tmp.key_block;
 176
 177         if (which & SSL3_CC_READ)
 178                 {
 179                 if ((s->enc_read_ctx == NULL) &&
 180                         ((s->enc_read_ctx=(EVP_CIPHER_CTX *)
 181                         Malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
 182                         goto err;
 183                 dd= s->enc_read_ctx;
 184                 s->read_hash=m;
 185                 if (s->expand != NULL)
 186                         {
 187                         COMP_CTX_free(s->expand);
 188                         s->expand=NULL;
 189                         }
 190                 if (comp != NULL)
 191                         {
 192                         s->expand=COMP_CTX_new(comp->method);
 193                         if (s->expand == NULL)
 194                                 {
 195                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 196                                 goto err2;
 197                                 }
 198                         if (s->s3->rrec.comp == NULL)
 199                                 s->s3->rrec.comp=(unsigned char *)
 200                                         Malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH);
 201                         if (s->s3->rrec.comp == NULL)
 202                                 goto err;
 203                         }
 204                 memset(&(s->s3->read_sequence[0]),0,8);
 205                 mac_secret= &(s->s3->read_mac_secret[0]);
 206                 }
 207         else
 208                 {
 209                 if ((s->enc_write_ctx == NULL) &&
 210                         ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
 211                         Malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
 212                         goto err;
 213                 dd= s->enc_write_ctx;
 214                 s->write_hash=m;
 215                 if (s->compress != NULL)
 216                         {
 217                         COMP_CTX_free(s->compress);
 218                         s->compress=NULL;
 219                         }
 220                 if (comp != NULL)
 221                         {
 222                         s->compress=COMP_CTX_new(comp->method);
 223                         if (s->compress == NULL)
 224                                 {
 225                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 226                                 goto err2;
 227                                 }
 228                         }
 229                 memset(&(s->s3->write_sequence[0]),0,8);
 230                 mac_secret= &(s->s3->write_mac_secret[0]);
 231                 }
 232
 233         EVP_CIPHER_CTX_init(dd);
 234
 235         p=s->s3->tmp.key_block;
 236         i=EVP_MD_size(m);
 237         cl=EVP_CIPHER_key_length(c);
 238         j=_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
 239                   cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
 240         /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 241         k=EVP_CIPHER_iv_length(c);
 242         er1= &(s->s3->client_random[0]);
 243         er2= &(s->s3->server_random[0]);
 244         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 245                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 246                 {
 247                 ms=  &(p[ 0]); n=i+i;
 248                 key= &(p[ n]); n+=j+j;
 249                 iv=  &(p[ n]); n+=k+k;
 250                 exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST;
 251                 exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE;
 252                 client_write=1;
 253                 }
 254         else
 255                 {
 256                 n=i;
 257                 ms=  &(p[ n]); n+=i+j;
 258                 key= &(p[ n]); n+=j+k;
 259                 iv=  &(p[ n]); n+=k;
 260                 exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST;
 261                 exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE;
 262                 client_write=0;
 263                 }
 264
 265         if (n > s->s3->tmp.key_block_length)
 266                 {
 267                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_INTERNAL_ERROR);
 268                 goto err2;
 269                 }
 270
 271         memcpy(mac_secret,ms,i);
 272 #ifdef TLS_DEBUG
 273 printf("which = %04X\nmac key=",which);
 274 { int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); }
 275 #endif
 276         if (_exp)
 277                 {
 278                 /* In here I set both the read and write key/iv to the
 279                  * same value since only the correct one will be used :-).
 280                  */
 281                 p=buf;
 282                 memcpy(p,exp_label,exp_label_len);
 283                 p+=exp_label_len;
 284                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 285                 p+=SSL3_RANDOM_SIZE;
 286                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 287                 p+=SSL3_RANDOM_SIZE;
 288                 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),key,j,
 289                          tmp1,tmp2,EVP_CIPHER_key_length(c));
 290                 key=tmp1;
 291
 292                 if (k > 0)
 293                         {
 294                         p=buf;
 295                         memcpy(p,TLS_MD_IV_BLOCK_CONST,
 296                                 TLS_MD_IV_BLOCK_CONST_SIZE);
 297                         p+=TLS_MD_IV_BLOCK_CONST_SIZE;
 298                         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 299                         p+=SSL3_RANDOM_SIZE;
 300                         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 301                         p+=SSL3_RANDOM_SIZE;
 302                         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,p-buf,empty,0,
 303                                  iv1,iv2,k*2);
 304                         if (client_write)
 305                                 iv=iv1;
 306                         else
 307                                 iv= &(iv1[k]);
 308                         }
 309                 }
 310
 311         s->session->key_arg_length=0;
 312
 313         EVP_CipherInit(dd,c,key,iv,(which & SSL3_CC_WRITE));
 314 #ifdef TLS_DEBUG
 315 printf("which = %04X\nkey=",which);
 316 { int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); }
 317 printf("\niv=");
 318 { int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); }
 319 printf("\n");
 320 #endif
 321
 322         memset(tmp1,0,sizeof(tmp1));
 323         memset(tmp2,0,sizeof(tmp1));
 324         memset(iv1,0,sizeof(iv1));
 325         memset(iv2,0,sizeof(iv2));
 326         return(1);
 327 err:
 328         SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 329 err2:
 330         return(0);
 331         }
 332
 333 int tls1_setup_key_block(SSL *s)
 334         {
 335         unsigned char *p1,*p2;
 336         const EVP_CIPHER *c;
 337         const EVP_MD *hash;
 338         int num;
 339         SSL_COMP *comp;
 340
 341         if (s->s3->tmp.key_block_length != 0)
 342                 return(1);
 343
 344         if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
 345                 {
 346                 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 347                 return(0);
 348                 }
 349
 350         s->s3->tmp.new_sym_enc=c;
 351         s->s3->tmp.new_hash=hash;
 352
 353         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
 354         num*=2;
 355
 356         ssl3_cleanup_key_block(s);
 357
 358         if ((p1=(unsigned char *)Malloc(num)) == NULL)
 359                 goto err;
 360         if ((p2=(unsigned char *)Malloc(num)) == NULL)
 361                 goto err;
 362
 363         s->s3->tmp.key_block_length=num;
 364         s->s3->tmp.key_block=p1;
 365
 366
 367 #ifdef TLS_DEBUG
 368 printf("client random\n");
 369 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); }
 370 printf("server random\n");
 371 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); }
 372 printf("pre-master\n");
 373 { int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); }
 374 #endif
 375         tls1_generate_key_block(s,p1,p2,num);
 376         memset(p2,0,num);
 377         Free(p2);
 378 #ifdef TLS_DEBUG
 379 printf("\nkey block\n");
 380 { int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); }
 381 #endif
 382
 383         return(1);
 384 err:
 385         SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 386         return(0);
 387         }
 388
 389 int tls1_enc(SSL *s, int send)
 390         {
 391         SSL3_RECORD *rec;
 392         EVP_CIPHER_CTX *ds;
 393         unsigned long l;
 394         int bs,i,ii,j,k,n=0;
 395         const EVP_CIPHER *enc;
 396
 397         if (send)
 398                 {
 399                 if (s->write_hash != NULL)
 400                         n=EVP_MD_size(s->write_hash);
 401                 ds=s->enc_write_ctx;
 402                 rec= &(s->s3->wrec);
 403                 if (s->enc_write_ctx == NULL)
 404                         enc=NULL;
 405                 else
 406                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 407                 }
 408         else
 409                 {
 410                 if (s->read_hash != NULL)
 411                         n=EVP_MD_size(s->read_hash);
 412                 ds=s->enc_read_ctx;
 413                 rec= &(s->s3->rrec);
 414                 if (s->enc_read_ctx == NULL)
 415                         enc=NULL;
 416                 else
 417                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 418                 }
 419
 420         if ((s->session == NULL) || (ds == NULL) ||
 421                 (enc == NULL))
 422                 {
 423                 memcpy(rec->data,rec->input,rec->length);
 424                 rec->input=rec->data;
 425                 }
 426         else
 427                 {
 428                 l=rec->length;
 429                 bs=EVP_CIPHER_block_size(ds->cipher);
 430
 431                 if ((bs != 1) && send)
 432                         {
 433                         i=bs-((int)l%bs);
 434
 435                         /* Add weird padding of upto 256 bytes */
 436
 437                         /* we need to add 'i' padding bytes of value j */
 438                         j=i-1;
 439                         if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG)
 440                                 {
 441                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 442                                         j++;
 443                                 }
 444                         for (k=(int)l; k<(int)(l+i); k++)
 445                                 rec->input[k]=j;
 446                         l+=i;
 447                         rec->length+=i;
 448                         }
 449
 450                 EVP_Cipher(ds,rec->data,rec->input,l);
 451
 452                 if ((bs != 1) && !send)
 453                         {
 454                         ii=i=rec->data[l-1];
 455                         i++;
 456                         if (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG)
 457                                 {
 458                                 /* First packet is even in size, so check */
 459                                 if ((memcmp(s->s3->read_sequence,
 460                                         "\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1))
 461                                         s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG;
 462                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 463                                         i--;
 464                                 }
 465                         if (i > (int)rec->length)
 466                                 {
 467                                 SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 468                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
 469                                 return(0);
 470                                 }
 471                         for (j=(int)(l-i); j<(int)l; j++)
 472                                 {
 473                                 if (rec->data[j] != ii)
 474                                         {
 475                                         SSLerr(SSL_F_TLS1_ENC,SSL_R_DECRYPTION_FAILED);
 476                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
 477                                         return(0);
 478                                         }
 479                                 }
 480                         rec->length-=i;
 481                         }
 482                 }
 483         return(1);
 484         }
 485
 486 int tls1_cert_verify_mac(SSL *s, EVP_MD_CTX *in_ctx, unsigned char *out)
 487         {
 488         unsigned int ret;
 489         EVP_MD_CTX ctx;
 490
 491         EVP_MD_CTX_copy(&ctx,in_ctx);
 492         EVP_DigestFinal(&ctx,out,&ret);
 493         return((int)ret);
 494         }
 495
 496 int tls1_final_finish_mac(SSL *s, EVP_MD_CTX *in1_ctx, EVP_MD_CTX *in2_ctx,
 497              const char *str, int slen, unsigned char *out)
 498         {
 499         unsigned int i;
 500         EVP_MD_CTX ctx;
 501         unsigned char buf[TLS_MD_MAX_CONST_SIZE+MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 502         unsigned char *q,buf2[12];
 503
 504         q=buf;
 505         memcpy(q,str,slen);
 506         q+=slen;
 507
 508         EVP_MD_CTX_copy(&ctx,in1_ctx);
 509         EVP_DigestFinal(&ctx,q,&i);
 510         q+=i;
 511         EVP_MD_CTX_copy(&ctx,in2_ctx);
 512         EVP_DigestFinal(&ctx,q,&i);
 513         q+=i;
 514
 515         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(q-buf),
 516                 s->session->master_key,s->session->master_key_length,
 517                 out,buf2,12);
 518         memset(&ctx,0,sizeof(EVP_MD_CTX));
 519
 520         return((int)12);
 521         }
 522
 523 int tls1_mac(SSL *ssl, unsigned char *md, int send)
 524         {
 525         SSL3_RECORD *rec;
 526         unsigned char *mac_sec,*seq;
 527         const EVP_MD *hash;
 528         unsigned int md_size;
 529         int i;
 530         HMAC_CTX hmac;
 531         unsigned char buf[5];
 532
 533         if (send)
 534                 {
 535                 rec= &(ssl->s3->wrec);
 536                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 537                 seq= &(ssl->s3->write_sequence[0]);
 538                 hash=ssl->write_hash;
 539                 }
 540         else
 541                 {
 542                 rec= &(ssl->s3->rrec);
 543                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 544                 seq= &(ssl->s3->read_sequence[0]);
 545                 hash=ssl->read_hash;
 546                 }
 547
 548         md_size=EVP_MD_size(hash);
 549
 550         buf[0]=rec->type;
 551         buf[1]=TLS1_VERSION_MAJOR;
 552         buf[2]=TLS1_VERSION_MINOR;
 553         buf[3]=rec->length>>8;
 554         buf[4]=rec->length&0xff;
 555
 556         /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */
 557         HMAC_Init(&hmac,mac_sec,EVP_MD_size(hash),hash);
 558         HMAC_Update(&hmac,seq,8);
 559         HMAC_Update(&hmac,buf,5);
 560         HMAC_Update(&hmac,rec->input,rec->length);
 561         HMAC_Final(&hmac,md,&md_size);
 562
 563 #ifdef TLS_DEBUG
 564 printf("sec=");
 565 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); }
 566 printf("seq=");
 567 {int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); }
 568 printf("buf=");
 569 {int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); }
 570 printf("rec=");
 571 {unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); }
 572 #endif
 573
 574         for (i=7; i>=0; i--)
 575                 if (++seq[i]) break;
 576
 577 #ifdef TLS_DEBUG
 578 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); }
 579 #endif
 580         return(md_size);
 581         }
 582
 583 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 584              int len)
 585         {
 586         unsigned char buf[SSL3_RANDOM_SIZE*2+TLS_MD_MASTER_SECRET_CONST_SIZE];
 587         unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH];
 588
 589         /* Setup the stuff to munge */
 590         memcpy(buf,TLS_MD_MASTER_SECRET_CONST,
 591                 TLS_MD_MASTER_SECRET_CONST_SIZE);
 592         memcpy(&(buf[TLS_MD_MASTER_SECRET_CONST_SIZE]),
 593                 s->s3->client_random,SSL3_RANDOM_SIZE);
 594         memcpy(&(buf[SSL3_RANDOM_SIZE+TLS_MD_MASTER_SECRET_CONST_SIZE]),
 595                 s->s3->server_random,SSL3_RANDOM_SIZE);
 596         tls1_PRF(s->ctx->md5,s->ctx->sha1,
 597                 buf,TLS_MD_MASTER_SECRET_CONST_SIZE+SSL3_RANDOM_SIZE*2,p,len,
 598                 s->session->master_key,buff,SSL3_MASTER_SECRET_SIZE);
 599         return(SSL3_MASTER_SECRET_SIZE);
 600         }
 601
 602 int tls1_alert_code(int code)
 603         {
 604         switch (code)
 605                 {
 606         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 607         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 608         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 609         case SSL_AD_DECRYPTION_FAILED:  return(TLS1_AD_DECRYPTION_FAILED);
 610         case SSL_AD_RECORD_OVERFLOW:    return(TLS1_AD_RECORD_OVERFLOW);
 611         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 612         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 613         case SSL_AD_NO_CERTIFICATE:     return(-1);
 614         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 615         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 616         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 617         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 618         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 619         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 620         case SSL_AD_UNKNOWN_CA:         return(TLS1_AD_UNKNOWN_CA);
 621         case SSL_AD_ACCESS_DENIED:      return(TLS1_AD_ACCESS_DENIED);
 622         case SSL_AD_DECODE_ERROR:       return(TLS1_AD_DECODE_ERROR);
 623         case SSL_AD_DECRYPT_ERROR:      return(TLS1_AD_DECRYPT_ERROR);
 624         case SSL_AD_EXPORT_RESTRICION:  return(TLS1_AD_EXPORT_RESTRICION);
 625         case SSL_AD_PROTOCOL_VERSION:   return(TLS1_AD_PROTOCOL_VERSION);
 626         case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY);
 627         case SSL_AD_INTERNAL_ERROR:     return(TLS1_AD_INTERNAL_ERROR);
 628         case SSL_AD_USER_CANCLED:       return(TLS1_AD_USER_CANCLED);
 629         case SSL_AD_NO_RENEGOTIATION:   return(TLS1_AD_NO_RENEGOTIATION);
 630         default:                        return(-1);
 631                 }
 632         }
 633