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 "comp.h"
  61 #include "evp.h"
  62 #include "hmac.h"
  63 #include "ssl_locl.h"
  64
  65 static void tls1_P_hash(md,sec,sec_len,seed,seed_len,out,olen)
  66 EVP_MD *md;
  67 unsigned char *sec;
  68 int sec_len;
  69 unsigned char *seed;
  70 int seed_len;
  71 unsigned char *out;
  72 int olen;
  73         {
  74         int chunk,n;
  75         unsigned int j;
  76         HMAC_CTX ctx;
  77         HMAC_CTX ctx_tmp;
  78         unsigned char A1[HMAC_MAX_MD_CBLOCK];
  79         unsigned int A1_len;
  80
  81         chunk=EVP_MD_size(md);
  82
  83         HMAC_Init(&ctx,sec,sec_len,md);
  84         HMAC_Update(&ctx,seed,seed_len);
  85         HMAC_Final(&ctx,A1,&A1_len);
  86
  87         n=0;
  88         for (;;)
  89                 {
  90                 HMAC_Init(&ctx,NULL,0,NULL); /* re-init */
  91                 HMAC_Update(&ctx,A1,A1_len);
  92                 memcpy(&ctx_tmp,&ctx,sizeof(ctx)); /* Copy for A2 */ /* not needed for last one */
  93                 HMAC_Update(&ctx,seed,seed_len);
  94
  95                 if (olen > chunk)
  96                         {
  97                         HMAC_Final(&ctx,out,&j);
  98                         out+=j;
  99                         olen-=j;
 100                         HMAC_Final(&ctx_tmp,A1,&A1_len); /* calc the next A1 value */
 101                         }
 102                 else    /* last one */
 103                         {
 104                         HMAC_Final(&ctx,A1,&A1_len);
 105                         memcpy(out,A1,olen);
 106                         break;
 107                         }
 108                 }
 109         HMAC_cleanup(&ctx);
 110         HMAC_cleanup(&ctx_tmp);
 111         memset(A1,0,sizeof(A1));
 112         }
 113
 114 static void tls1_PRF(md5,sha1,label,label_len,sec,slen,out1,out2,olen)
 115 EVP_MD *md5;
 116 EVP_MD *sha1;
 117 unsigned char *label;
 118 int label_len;
 119 unsigned char *sec;
 120 int slen;
 121 unsigned char *out1;
 122 unsigned char *out2;
 123 int olen;
 124         {
 125         int len,i;
 126         unsigned char *S1,*S2;
 127
 128         len=slen/2;
 129         S1=sec;
 130         S2= &(sec[len]);
 131         len+=(slen&1); /* add for odd, make longer */
 132
 133
 134         tls1_P_hash(md5 ,S1,len,label,label_len,out1,olen);
 135         tls1_P_hash(sha1,S2,len,label,label_len,out2,olen);
 136
 137         for (i=0; i<olen; i++)
 138                 out1[i]^=out2[i];
 139         }
 140
 141 static void tls1_generate_key_block(s,km,tmp,num)
 142 SSL *s;
 143 unsigned char *km,*tmp;
 144 int num;
 145         {
 146         unsigned char *p;
 147         unsigned char buf[SSL3_RANDOM_SIZE*2+
 148                 TLS_MD_MAX_CONST_SIZE];
 149         p=buf;
 150
 151         memcpy(p,TLS_MD_KEY_EXPANSION_CONST,
 152                 TLS_MD_KEY_EXPANSION_CONST_SIZE);
 153         p+=TLS_MD_KEY_EXPANSION_CONST_SIZE;
 154         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 155         p+=SSL3_RANDOM_SIZE;
 156         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 157         p+=SSL3_RANDOM_SIZE;
 158
 159         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),
 160                 s->session->master_key,s->session->master_key_length,
 161                 km,tmp,num);
 162         }
 163
 164 int tls1_change_cipher_state(s,which)
 165 SSL *s;
 166 int which;
 167         {
 168         unsigned char *p,*key_block,*mac_secret;
 169         unsigned char *exp_label,buf[TLS_MD_MAX_CONST_SIZE+
 170                 SSL3_RANDOM_SIZE*2];
 171         unsigned char tmp1[EVP_MAX_KEY_LENGTH];
 172         unsigned char tmp2[EVP_MAX_KEY_LENGTH];
 173         unsigned char iv1[EVP_MAX_IV_LENGTH*2];
 174         unsigned char iv2[EVP_MAX_IV_LENGTH*2];
 175         unsigned char *ms,*key,*iv,*er1,*er2;
 176         int client_write;
 177         EVP_CIPHER_CTX *dd;
 178         EVP_CIPHER *c;
 179         SSL_COMP *comp;
 180         EVP_MD *m;
 181         int _exp,n,i,j,k,exp_label_len,cl;
 182
 183         _exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
 184         c=s->s3->tmp.new_sym_enc;
 185         m=s->s3->tmp.new_hash;
 186         comp=s->s3->tmp.new_compression;
 187         key_block=s->s3->tmp.key_block;
 188
 189         if (which & SSL3_CC_READ)
 190                 {
 191                 if ((s->enc_read_ctx == NULL) &&
 192                         ((s->enc_read_ctx=(EVP_CIPHER_CTX *)
 193                         Malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
 194                         goto err;
 195                 dd= s->enc_read_ctx;
 196                 s->read_hash=m;
 197                 if (s->expand != NULL)
 198                         {
 199                         COMP_CTX_free(s->expand);
 200                         s->expand=NULL;
 201                         }
 202                 if (comp != NULL)
 203                         {
 204                         s->expand=COMP_CTX_new(comp->method);
 205                         if (s->expand == NULL)
 206                                 {
 207                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 208                                 goto err2;
 209                                 }
 210                         if (s->s3->rrec.comp == NULL)
 211                                 s->s3->rrec.comp=(unsigned char *)
 212                                         Malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH);
 213                         if (s->s3->rrec.comp == NULL)
 214                                 goto err;
 215                         }
 216                 memset(&(s->s3->read_sequence[0]),0,8);
 217                 mac_secret= &(s->s3->read_mac_secret[0]);
 218                 }
 219         else
 220                 {
 221                 if ((s->enc_write_ctx == NULL) &&
 222                         ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
 223                         Malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
 224                         goto err;
 225                 dd= s->enc_write_ctx;
 226                 s->write_hash=m;
 227                 if (s->compress != NULL)
 228                         {
 229                         COMP_CTX_free(s->compress);
 230                         s->compress=NULL;
 231                         }
 232                 if (comp != NULL)
 233                         {
 234                         s->compress=COMP_CTX_new(comp->method);
 235                         if (s->compress == NULL)
 236                                 {
 237                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 238                                 goto err2;
 239                                 }
 240                         }
 241                 memset(&(s->s3->write_sequence[0]),0,8);
 242                 mac_secret= &(s->s3->write_mac_secret[0]);
 243                 }
 244
 245         EVP_CIPHER_CTX_init(dd);
 246
 247         p=s->s3->tmp.key_block;
 248         i=EVP_MD_size(m);
 249         cl=EVP_CIPHER_key_length(c);
 250         j=_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
 251                   cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
 252         /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 253         k=EVP_CIPHER_iv_length(c);
 254         er1= &(s->s3->client_random[0]);
 255         er2= &(s->s3->server_random[0]);
 256         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 257                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 258                 {
 259                 ms=  &(p[ 0]); n=i+i;
 260                 key= &(p[ n]); n+=j+j;
 261                 iv=  &(p[ n]); n+=k+k;
 262                 exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST;
 263                 exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE;
 264                 client_write=1;
 265                 }
 266         else
 267                 {
 268                 n=i;
 269                 ms=  &(p[ n]); n+=i+j;
 270                 key= &(p[ n]); n+=j+k;
 271                 iv=  &(p[ n]); n+=k;
 272                 exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST;
 273                 exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE;
 274                 client_write=0;
 275                 }
 276
 277         if (n > s->s3->tmp.key_block_length)
 278                 {
 279                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_INTERNAL_ERROR);
 280                 goto err2;
 281                 }
 282
 283         memcpy(mac_secret,ms,i);
 284 #ifdef TLS_DEBUG
 285 printf("which = %04X\nmac key=",which);
 286 { int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); }
 287 #endif
 288         if (_exp)
 289                 {
 290                 /* In here I set both the read and write key/iv to the
 291                  * same value since only the correct one will be used :-).
 292                  */
 293                 p=buf;
 294                 memcpy(p,exp_label,exp_label_len);
 295                 p+=exp_label_len;
 296                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 297                 p+=SSL3_RANDOM_SIZE;
 298                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 299                 p+=SSL3_RANDOM_SIZE;
 300                 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),key,j,
 301                          tmp1,tmp2,EVP_CIPHER_key_length(c));
 302                 key=tmp1;
 303
 304                 if (k > 0)
 305                         {
 306                         p=buf;
 307                         memcpy(p,TLS_MD_IV_BLOCK_CONST,
 308                                 TLS_MD_IV_BLOCK_CONST_SIZE);
 309                         p+=TLS_MD_IV_BLOCK_CONST_SIZE;
 310                         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 311                         p+=SSL3_RANDOM_SIZE;
 312                         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 313                         p+=SSL3_RANDOM_SIZE;
 314                         tls1_PRF(s->ctx->md5,s->ctx->sha1,
 315                                 buf,(int)(p-buf),"",0,iv1,iv2,k*2);
 316                         if (client_write)
 317                                 iv=iv1;
 318                         else
 319                                 iv= &(iv1[k]);
 320                         }
 321                 }
 322
 323         s->session->key_arg_length=0;
 324
 325         EVP_CipherInit(dd,c,key,iv,(which & SSL3_CC_WRITE));
 326 #ifdef TLS_DEBUG
 327 printf("which = %04X\nkey=",which);
 328 { int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); }
 329 printf("\niv=");
 330 { int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); }
 331 printf("\n");
 332 #endif
 333
 334         memset(tmp1,0,sizeof(tmp1));
 335         memset(tmp2,0,sizeof(tmp1));
 336         memset(iv1,0,sizeof(iv1));
 337         memset(iv2,0,sizeof(iv2));
 338         return(1);
 339 err:
 340         SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 341 err2:
 342         return(0);
 343         }
 344
 345 int tls1_setup_key_block(s)
 346 SSL *s;
 347         {
 348         unsigned char *p1,*p2;
 349         EVP_CIPHER *c;
 350         EVP_MD *hash;
 351         int num;
 352         SSL_COMP *comp;
 353
 354         if (s->s3->tmp.key_block_length != 0)
 355                 return(1);
 356
 357         if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
 358                 {
 359                 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 360                 return(0);
 361                 }
 362
 363         s->s3->tmp.new_sym_enc=c;
 364         s->s3->tmp.new_hash=hash;
 365
 366         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
 367         num*=2;
 368
 369         ssl3_cleanup_key_block(s);
 370
 371         if ((p1=(unsigned char *)Malloc(num)) == NULL)
 372                 goto err;
 373         if ((p2=(unsigned char *)Malloc(num)) == NULL)
 374                 goto err;
 375
 376         s->s3->tmp.key_block_length=num;
 377         s->s3->tmp.key_block=p1;
 378
 379
 380 #ifdef TLS_DEBUG
 381 printf("client random\n");
 382 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); }
 383 printf("server random\n");
 384 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); }
 385 printf("pre-master\n");
 386 { int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); }
 387 #endif
 388         tls1_generate_key_block(s,p1,p2,num);
 389         memset(p2,0,num);
 390         Free(p2);
 391 #ifdef TLS_DEBUG
 392 printf("\nkey block\n");
 393 { int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); }
 394 #endif
 395
 396         return(1);
 397 err:
 398         SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 399         return(0);
 400         }
 401
 402 int tls1_enc(s,send)
 403 SSL *s;
 404 int send;
 405         {
 406         SSL3_RECORD *rec;
 407         EVP_CIPHER_CTX *ds;
 408         unsigned long l;
 409         int bs,i,ii,j,k,n=0;
 410         EVP_CIPHER *enc;
 411
 412         if (send)
 413                 {
 414                 if (s->write_hash != NULL)
 415                         n=EVP_MD_size(s->write_hash);
 416                 ds=s->enc_write_ctx;
 417                 rec= &(s->s3->wrec);
 418                 if (s->enc_write_ctx == NULL)
 419                         enc=NULL;
 420                 else
 421                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 422                 }
 423         else
 424                 {
 425                 if (s->read_hash != NULL)
 426                         n=EVP_MD_size(s->read_hash);
 427                 ds=s->enc_read_ctx;
 428                 rec= &(s->s3->rrec);
 429                 if (s->enc_read_ctx == NULL)
 430                         enc=NULL;
 431                 else
 432                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 433                 }
 434
 435         if ((s->session == NULL) || (ds == NULL) ||
 436                 (enc == NULL))
 437                 {
 438                 memcpy(rec->data,rec->input,rec->length);
 439                 rec->input=rec->data;
 440                 }
 441         else
 442                 {
 443                 l=rec->length;
 444                 bs=EVP_CIPHER_block_size(ds->cipher);
 445
 446                 if ((bs != 1) && send)
 447                         {
 448                         i=bs-((int)l%bs);
 449
 450                         /* Add weird padding of upto 256 bytes */
 451
 452                         /* we need to add 'i' padding bytes of value j */
 453                         j=i-1;
 454                         if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG)
 455                                 {
 456                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 457                                         j++;
 458                                 }
 459                         for (k=(int)l; k<(int)(l+i); k++)
 460                                 rec->input[k]=j;
 461                         l+=i;
 462                         rec->length+=i;
 463                         }
 464
 465                 EVP_Cipher(ds,rec->data,rec->input,l);
 466
 467                 if ((bs != 1) && !send)
 468                         {
 469                         ii=i=rec->data[l-1];
 470                         i++;
 471                         if (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG)
 472                                 {
 473                                 /* First packet is even in size, so check */
 474                                 if ((memcmp(s->s3->read_sequence,
 475                                         "\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1))
 476                                         s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG;
 477                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 478                                         i--;
 479                                 }
 480                         if (i > (int)rec->length)
 481                                 {
 482                                 SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 483                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
 484                                 return(0);
 485                                 }
 486                         for (j=(int)(l-i); j<(int)l; j++)
 487                                 {
 488                                 if (rec->data[j] != ii)
 489                                         {
 490                                         SSLerr(SSL_F_TLS1_ENC,SSL_R_DECRYPTION_FAILED);
 491                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
 492                                         return(0);
 493                                         }
 494                                 }
 495                         rec->length-=i;
 496                         }
 497                 }
 498         return(1);
 499         }
 500
 501 int tls1_cert_verify_mac(s,in_ctx,out)
 502 SSL *s;
 503 EVP_MD_CTX *in_ctx;
 504 unsigned char *out;
 505         {
 506         unsigned int ret;
 507         EVP_MD_CTX ctx;
 508
 509         EVP_MD_CTX_copy(&ctx,in_ctx);
 510         EVP_DigestFinal(&ctx,out,&ret);
 511         return((int)ret);
 512         }
 513
 514 int tls1_final_finish_mac(s,in1_ctx,in2_ctx,str,slen,out)
 515 SSL *s;
 516 EVP_MD_CTX *in1_ctx,*in2_ctx;
 517 unsigned char *str;
 518 int slen;
 519 unsigned char *out;
 520         {
 521         unsigned int i;
 522         EVP_MD_CTX ctx;
 523         unsigned char buf[TLS_MD_MAX_CONST_SIZE+MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 524         unsigned char *q,buf2[12];
 525
 526         q=buf;
 527         memcpy(q,str,slen);
 528         q+=slen;
 529
 530         EVP_MD_CTX_copy(&ctx,in1_ctx);
 531         EVP_DigestFinal(&ctx,q,&i);
 532         q+=i;
 533         EVP_MD_CTX_copy(&ctx,in2_ctx);
 534         EVP_DigestFinal(&ctx,q,&i);
 535         q+=i;
 536
 537         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(q-buf),
 538                 s->session->master_key,s->session->master_key_length,
 539                 out,buf2,12);
 540         memset(&ctx,0,sizeof(EVP_MD_CTX));
 541
 542         return((int)12);
 543         }
 544
 545 int tls1_mac(ssl,md,send)
 546 SSL *ssl;
 547 unsigned char *md;
 548 int send;
 549         {
 550         SSL3_RECORD *rec;
 551         unsigned char *mac_sec,*seq;
 552         EVP_MD *hash;
 553         unsigned int md_size;
 554         int i;
 555         HMAC_CTX hmac;
 556         unsigned char buf[5];
 557
 558         if (send)
 559                 {
 560                 rec= &(ssl->s3->wrec);
 561                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 562                 seq= &(ssl->s3->write_sequence[0]);
 563                 hash=ssl->write_hash;
 564                 }
 565         else
 566                 {
 567                 rec= &(ssl->s3->rrec);
 568                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 569                 seq= &(ssl->s3->read_sequence[0]);
 570                 hash=ssl->read_hash;
 571                 }
 572
 573         md_size=EVP_MD_size(hash);
 574
 575         buf[0]=rec->type;
 576         buf[1]=TLS1_VERSION_MAJOR;
 577         buf[2]=TLS1_VERSION_MINOR;
 578         buf[3]=rec->length>>8;
 579         buf[4]=rec->length&0xff;
 580
 581         /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */
 582         HMAC_Init(&hmac,mac_sec,EVP_MD_size(hash),hash);
 583         HMAC_Update(&hmac,seq,8);
 584         HMAC_Update(&hmac,buf,5);
 585         HMAC_Update(&hmac,rec->input,rec->length);
 586         HMAC_Final(&hmac,md,&md_size);
 587
 588 #ifdef TLS_DEBUG
 589 printf("sec=");
 590 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); }
 591 printf("seq=");
 592 {int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); }
 593 printf("buf=");
 594 {int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); }
 595 printf("rec=");
 596 {unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); }
 597 #endif
 598
 599         for (i=7; i>=0; i--)
 600                 if (++seq[i]) break;
 601
 602 #ifdef TLS_DEBUG
 603 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); }
 604 #endif
 605         return(md_size);
 606         }
 607
 608 int tls1_generate_master_secret(s,out,p,len)
 609 SSL *s;
 610 unsigned char *out;
 611 unsigned char *p;
 612 int len;
 613         {
 614         unsigned char buf[SSL3_RANDOM_SIZE*2+TLS_MD_MASTER_SECRET_CONST_SIZE];
 615         unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH];
 616
 617         /* Setup the stuff to munge */
 618         memcpy(buf,TLS_MD_MASTER_SECRET_CONST,
 619                 TLS_MD_MASTER_SECRET_CONST_SIZE);
 620         memcpy(&(buf[TLS_MD_MASTER_SECRET_CONST_SIZE]),
 621                 s->s3->client_random,SSL3_RANDOM_SIZE);
 622         memcpy(&(buf[SSL3_RANDOM_SIZE+TLS_MD_MASTER_SECRET_CONST_SIZE]),
 623                 s->s3->server_random,SSL3_RANDOM_SIZE);
 624         tls1_PRF(s->ctx->md5,s->ctx->sha1,
 625                 buf,TLS_MD_MASTER_SECRET_CONST_SIZE+SSL3_RANDOM_SIZE*2,p,len,
 626                 s->session->master_key,buff,SSL3_MASTER_SECRET_SIZE);
 627         return(SSL3_MASTER_SECRET_SIZE);
 628         }
 629
 630 int tls1_alert_code(code)
 631 int code;
 632         {
 633         switch (code)
 634                 {
 635         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 636         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 637         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 638         case SSL_AD_DECRYPTION_FAILED:  return(TLS1_AD_DECRYPTION_FAILED);
 639         case SSL_AD_RECORD_OVERFLOW:    return(TLS1_AD_RECORD_OVERFLOW);
 640         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 641         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 642         case SSL_AD_NO_CERTIFICATE:     return(-1);
 643         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 644         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 645         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 646         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 647         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 648         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 649         case SSL_AD_UNKNOWN_CA:         return(TLS1_AD_UNKNOWN_CA);
 650         case SSL_AD_ACCESS_DENIED:      return(TLS1_AD_ACCESS_DENIED);
 651         case SSL_AD_DECODE_ERROR:       return(TLS1_AD_DECODE_ERROR);
 652         case SSL_AD_DECRYPT_ERROR:      return(TLS1_AD_DECRYPT_ERROR);
 653         case SSL_AD_EXPORT_RESTRICION:  return(TLS1_AD_EXPORT_RESTRICION);
 654         case SSL_AD_PROTOCOL_VERSION:   return(TLS1_AD_PROTOCOL_VERSION);
 655         case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY);
 656         case SSL_AD_INTERNAL_ERROR:     return(TLS1_AD_INTERNAL_ERROR);
 657         case SSL_AD_USER_CANCLED:       return(TLS1_AD_USER_CANCLED);
 658         case SSL_AD_NO_RENEGOTIATION:   return(TLS1_AD_NO_RENEGOTIATION);
 659         default:                        return(-1);
 660                 }
 661         }
 662