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/evp.h>
  62 #include <openssl/hmac.h>
  63 #include "ssl_locl.h"
  64 #include <openssl/md5.h>
  65
  66 static void tls1_P_hash(const EVP_MD *md, const unsigned char *sec,
  67                         int sec_len, unsigned char *seed, int seed_len,
  68                         unsigned char *out, int olen)
  69         {
  70         int chunk,n;
  71         unsigned int j;
  72         HMAC_CTX ctx;
  73         HMAC_CTX ctx_tmp;
  74         unsigned char A1[HMAC_MAX_MD_CBLOCK];
  75         unsigned int A1_len;
  76
  77         chunk=EVP_MD_size(md);
  78
  79         HMAC_CTX_init(&ctx);
  80         HMAC_CTX_init(&ctx_tmp);
  81         HMAC_Init(&ctx,sec,sec_len,md);
  82         HMAC_Init(&ctx_tmp,sec,sec_len,md);
  83         HMAC_Update(&ctx,seed,seed_len);
  84         HMAC_Final(&ctx,A1,&A1_len);
  85
  86         n=0;
  87         for (;;)
  88                 {
  89                 HMAC_Init(&ctx,NULL,0,NULL); /* re-init */
  90                 HMAC_Init(&ctx_tmp,NULL,0,NULL); /* re-init */
  91                 HMAC_Update(&ctx,A1,A1_len);
  92                 HMAC_Update(&ctx_tmp,A1,A1_len);
  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_CTX_cleanup(&ctx);
 110         HMAC_CTX_cleanup(&ctx_tmp);
 111         memset(A1,0,sizeof(A1));
 112         }
 113
 114 static void tls1_PRF(const EVP_MD *md5, const EVP_MD *sha1,
 115                      unsigned char *label, int label_len,
 116                      const unsigned char *sec, int slen, unsigned char *out1,
 117                      unsigned char *out2, int olen)
 118         {
 119         int len,i;
 120         const unsigned char *S1,*S2;
 121
 122         len=slen/2;
 123         S1=sec;
 124         S2= &(sec[len]);
 125         len+=(slen&1); /* add for odd, make longer */
 126
 127
 128         tls1_P_hash(md5 ,S1,len,label,label_len,out1,olen);
 129         tls1_P_hash(sha1,S2,len,label,label_len,out2,olen);
 130
 131         for (i=0; i<olen; i++)
 132                 out1[i]^=out2[i];
 133         }
 134
 135 static void tls1_generate_key_block(SSL *s, unsigned char *km,
 136              unsigned char *tmp, int num)
 137         {
 138         unsigned char *p;
 139         unsigned char buf[SSL3_RANDOM_SIZE*2+
 140                 TLS_MD_MAX_CONST_SIZE];
 141         p=buf;
 142
 143         memcpy(p,TLS_MD_KEY_EXPANSION_CONST,
 144                 TLS_MD_KEY_EXPANSION_CONST_SIZE);
 145         p+=TLS_MD_KEY_EXPANSION_CONST_SIZE;
 146         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 147         p+=SSL3_RANDOM_SIZE;
 148         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 149         p+=SSL3_RANDOM_SIZE;
 150
 151         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),
 152                  s->session->master_key,s->session->master_key_length,
 153                  km,tmp,num);
 154 #ifdef KSSL_DEBUG
 155         printf("tls1_generate_key_block() ==> %d byte master_key =\n\t",
 156                 s->session->master_key_length);
 157         {
 158         int i;
 159         for (i=0; i < s->session->master_key_length; i++)
 160                 {
 161                 printf("%02X", s->session->master_key[i]);
 162                 }
 163         printf("\n");  }
 164 #endif    /* KSSL_DEBUG */
 165         }
 166
 167 int tls1_change_cipher_state(SSL *s, int which)
 168         {
 169         static const unsigned char empty[]="";
 170         unsigned char *p,*key_block,*mac_secret;
 171         unsigned char *exp_label,buf[TLS_MD_MAX_CONST_SIZE+
 172                 SSL3_RANDOM_SIZE*2];
 173         unsigned char tmp1[EVP_MAX_KEY_LENGTH];
 174         unsigned char tmp2[EVP_MAX_KEY_LENGTH];
 175         unsigned char iv1[EVP_MAX_IV_LENGTH*2];
 176         unsigned char iv2[EVP_MAX_IV_LENGTH*2];
 177         unsigned char *ms,*key,*iv,*er1,*er2;
 178         int client_write;
 179         EVP_CIPHER_CTX *dd;
 180         const EVP_CIPHER *c;
 181         const SSL_COMP *comp;
 182         const EVP_MD *m;
 183         int is_export,n,i,j,k,exp_label_len,cl;
 184         int reuse_dd = 0;
 185
 186         is_export=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
 187         c=s->s3->tmp.new_sym_enc;
 188         m=s->s3->tmp.new_hash;
 189         comp=s->s3->tmp.new_compression;
 190         key_block=s->s3->tmp.key_block;
 191
 192 #ifdef KSSL_DEBUG
 193         printf("tls1_change_cipher_state(which= %d) w/\n", which);
 194         printf("\talg= %ld, comp= %p\n", s->s3->tmp.new_cipher->algorithms,
 195                 comp);
 196         printf("\tevp_cipher == %p ==? &d_cbc_ede_cipher3\n", c);
 197         printf("\tevp_cipher: nid, blksz= %d, %d, keylen=%d, ivlen=%d\n",
 198                 c->nid,c->block_size,c->key_len,c->iv_len);
 199         printf("\tkey_block: len= %d, data= ", s->s3->tmp.key_block_length);
 200         {
 201         int i;
 202         for (i=0; i<s->s3->tmp.key_block_length; i++)
 203                 printf("%02x", key_block[i]);  printf("\n");
 204         }
 205 #endif  /* KSSL_DEBUG */
 206
 207         if (which & SSL3_CC_READ)
 208                 {
 209                 if (s->enc_read_ctx != NULL)
 210                         reuse_dd = 1;
 211                 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 212                         goto err;
 213                 dd= s->enc_read_ctx;
 214                 s->read_hash=m;
 215                 if (s->expand != NULL)
 216                         {
 217                         COMP_CTX_free(s->expand);
 218                         s->expand=NULL;
 219                         }
 220                 if (comp != NULL)
 221                         {
 222                         s->expand=COMP_CTX_new(comp->method);
 223                         if (s->expand == NULL)
 224                                 {
 225                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 226                                 goto err2;
 227                                 }
 228                         if (s->s3->rrec.comp == NULL)
 229                                 s->s3->rrec.comp=(unsigned char *)
 230                                         OPENSSL_malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH);
 231                         if (s->s3->rrec.comp == NULL)
 232                                 goto err;
 233                         }
 234                 memset(&(s->s3->read_sequence[0]),0,8);
 235                 mac_secret= &(s->s3->read_mac_secret[0]);
 236                 }
 237         else
 238                 {
 239                 if (s->enc_write_ctx != NULL)
 240                         reuse_dd = 1;
 241                 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 242                         goto err;
 243                 if ((s->enc_write_ctx == NULL) &&
 244                         ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
 245                         OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
 246                         goto err;
 247                 dd= s->enc_write_ctx;
 248                 s->write_hash=m;
 249                 if (s->compress != NULL)
 250                         {
 251                         COMP_CTX_free(s->compress);
 252                         s->compress=NULL;
 253                         }
 254                 if (comp != NULL)
 255                         {
 256                         s->compress=COMP_CTX_new(comp->method);
 257                         if (s->compress == NULL)
 258                                 {
 259                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 260                                 goto err2;
 261                                 }
 262                         }
 263                 memset(&(s->s3->write_sequence[0]),0,8);
 264                 mac_secret= &(s->s3->write_mac_secret[0]);
 265                 }
 266
 267         if (reuse_dd)
 268                 EVP_CIPHER_CTX_cleanup(dd);
 269         EVP_CIPHER_CTX_init(dd);
 270
 271         p=s->s3->tmp.key_block;
 272         i=EVP_MD_size(m);
 273         cl=EVP_CIPHER_key_length(c);
 274         j=is_export ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
 275                        cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
 276         /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 277         k=EVP_CIPHER_iv_length(c);
 278         er1= &(s->s3->client_random[0]);
 279         er2= &(s->s3->server_random[0]);
 280         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 281                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 282                 {
 283                 ms=  &(p[ 0]); n=i+i;
 284                 key= &(p[ n]); n+=j+j;
 285                 iv=  &(p[ n]); n+=k+k;
 286                 exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST;
 287                 exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE;
 288                 client_write=1;
 289                 }
 290         else
 291                 {
 292                 n=i;
 293                 ms=  &(p[ n]); n+=i+j;
 294                 key= &(p[ n]); n+=j+k;
 295                 iv=  &(p[ n]); n+=k;
 296                 exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST;
 297                 exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE;
 298                 client_write=0;
 299                 }
 300
 301         if (n > s->s3->tmp.key_block_length)
 302                 {
 303                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
 304                 goto err2;
 305                 }
 306
 307         memcpy(mac_secret,ms,i);
 308 #ifdef TLS_DEBUG
 309 printf("which = %04X\nmac key=",which);
 310 { int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); }
 311 #endif
 312         if (is_export)
 313                 {
 314                 /* In here I set both the read and write key/iv to the
 315                  * same value since only the correct one will be used :-).
 316                  */
 317                 p=buf;
 318                 memcpy(p,exp_label,exp_label_len);
 319                 p+=exp_label_len;
 320                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 321                 p+=SSL3_RANDOM_SIZE;
 322                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 323                 p+=SSL3_RANDOM_SIZE;
 324                 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),key,j,
 325                          tmp1,tmp2,EVP_CIPHER_key_length(c));
 326                 key=tmp1;
 327
 328                 if (k > 0)
 329                         {
 330                         p=buf;
 331                         memcpy(p,TLS_MD_IV_BLOCK_CONST,
 332                                 TLS_MD_IV_BLOCK_CONST_SIZE);
 333                         p+=TLS_MD_IV_BLOCK_CONST_SIZE;
 334                         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 335                         p+=SSL3_RANDOM_SIZE;
 336                         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 337                         p+=SSL3_RANDOM_SIZE;
 338                         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,p-buf,empty,0,
 339                                  iv1,iv2,k*2);
 340                         if (client_write)
 341                                 iv=iv1;
 342                         else
 343                                 iv= &(iv1[k]);
 344                         }
 345                 }
 346
 347         s->session->key_arg_length=0;
 348 #ifdef KSSL_DEBUG
 349         {
 350         int i;
 351         printf("EVP_CipherInit_ex(dd,c,key=,iv=,which)\n");
 352         printf("\tkey= "); for (i=0; i<c->key_len; i++) printf("%02x", key[i]);
 353         printf("\n");
 354         printf("\t iv= "); for (i=0; i<c->iv_len; i++) printf("%02x", iv[i]);
 355         printf("\n");
 356         }
 357 #endif  /* KSSL_DEBUG */
 358
 359         EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
 360 #ifdef TLS_DEBUG
 361 printf("which = %04X\nkey=",which);
 362 { int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); }
 363 printf("\niv=");
 364 { int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); }
 365 printf("\n");
 366 #endif
 367
 368         memset(tmp1,0,sizeof(tmp1));
 369         memset(tmp2,0,sizeof(tmp1));
 370         memset(iv1,0,sizeof(iv1));
 371         memset(iv2,0,sizeof(iv2));
 372         return(1);
 373 err:
 374         SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 375 err2:
 376         return(0);
 377         }
 378
 379 int tls1_setup_key_block(SSL *s)
 380         {
 381         unsigned char *p1,*p2;
 382         const EVP_CIPHER *c;
 383         const EVP_MD *hash;
 384         int num;
 385         SSL_COMP *comp;
 386
 387 #ifdef KSSL_DEBUG
 388         printf ("tls1_setup_key_block()\n");
 389 #endif  /* KSSL_DEBUG */
 390
 391         if (s->s3->tmp.key_block_length != 0)
 392                 return(1);
 393
 394         if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
 395                 {
 396                 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 397                 return(0);
 398                 }
 399
 400         s->s3->tmp.new_sym_enc=c;
 401         s->s3->tmp.new_hash=hash;
 402
 403         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
 404         num*=2;
 405
 406         ssl3_cleanup_key_block(s);
 407
 408         if ((p1=(unsigned char *)OPENSSL_malloc(num)) == NULL)
 409                 goto err;
 410         if ((p2=(unsigned char *)OPENSSL_malloc(num)) == NULL)
 411                 goto err;
 412
 413         s->s3->tmp.key_block_length=num;
 414         s->s3->tmp.key_block=p1;
 415
 416
 417 #ifdef TLS_DEBUG
 418 printf("client random\n");
 419 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); }
 420 printf("server random\n");
 421 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); }
 422 printf("pre-master\n");
 423 { int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); }
 424 #endif
 425         tls1_generate_key_block(s,p1,p2,num);
 426         memset(p2,0,num);
 427         OPENSSL_free(p2);
 428 #ifdef TLS_DEBUG
 429 printf("\nkey block\n");
 430 { int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); }
 431 #endif
 432
 433         return(1);
 434 err:
 435         SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 436         return(0);
 437         }
 438
 439 int tls1_enc(SSL *s, int send)
 440         {
 441         SSL3_RECORD *rec;
 442         EVP_CIPHER_CTX *ds;
 443         unsigned long l;
 444         int bs,i,ii,j,k,n=0;
 445         const EVP_CIPHER *enc;
 446
 447         if (send)
 448                 {
 449                 if (s->write_hash != NULL)
 450                         n=EVP_MD_size(s->write_hash);
 451                 ds=s->enc_write_ctx;
 452                 rec= &(s->s3->wrec);
 453                 if (s->enc_write_ctx == NULL)
 454                         enc=NULL;
 455                 else
 456                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 457                 }
 458         else
 459                 {
 460                 if (s->read_hash != NULL)
 461                         n=EVP_MD_size(s->read_hash);
 462                 ds=s->enc_read_ctx;
 463                 rec= &(s->s3->rrec);
 464                 if (s->enc_read_ctx == NULL)
 465                         enc=NULL;
 466                 else
 467                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 468                 }
 469
 470 #ifdef KSSL_DEBUG
 471         printf("tls1_enc(%d)\n", send);
 472 #endif    /* KSSL_DEBUG */
 473
 474         if ((s->session == NULL) || (ds == NULL) ||
 475                 (enc == NULL))
 476                 {
 477                 memmove(rec->data,rec->input,rec->length);
 478                 rec->input=rec->data;
 479                 }
 480         else
 481                 {
 482                 l=rec->length;
 483                 bs=EVP_CIPHER_block_size(ds->cipher);
 484
 485                 if ((bs != 1) && send)
 486                         {
 487                         i=bs-((int)l%bs);
 488
 489                         /* Add weird padding of upto 256 bytes */
 490
 491                         /* we need to add 'i' padding bytes of value j */
 492                         j=i-1;
 493                         if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG)
 494                                 {
 495                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 496                                         j++;
 497                                 }
 498                         for (k=(int)l; k<(int)(l+i); k++)
 499                                 rec->input[k]=j;
 500                         l+=i;
 501                         rec->length+=i;
 502                         }
 503
 504 #ifdef KSSL_DEBUG
 505                 {
 506                 unsigned long ui;
 507                 printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n",
 508                         ds,rec->data,rec->input,l);
 509                 printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n",
 510                         ds->buf_len, ds->cipher->key_len,
 511                         DES_KEY_SZ, DES_SCHEDULE_SZ,
 512                         ds->cipher->iv_len);
 513                 printf("\t\tIV: ");
 514                 for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]);
 515                 printf("\n");
 516                 printf("\trec->input=");
 517                 for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]);
 518                 printf("\n");
 519                 }
 520 #endif  /* KSSL_DEBUG */
 521
 522                 if (!send)
 523                         {
 524                         if (l == 0 || l%bs != 0)
 525                                 {
 526                                 SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 527                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
 528                                 return 0;
 529                                 }
 530                         }
 531
 532                 EVP_Cipher(ds,rec->data,rec->input,l);
 533
 534 #ifdef KSSL_DEBUG
 535                 {
 536                 unsigned long i;
 537                 printf("\trec->data=");
 538                 for (i=0; i<l; i++)
 539                         printf(" %02x", rec->data[i]);  printf("\n");
 540                 }
 541 #endif  /* KSSL_DEBUG */
 542
 543                 if ((bs != 1) && !send)
 544                         {
 545                         ii=i=rec->data[l-1]; /* padding_length */
 546                         i++;
 547                         if (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG)
 548                                 {
 549                                 /* First packet is even in size, so check */
 550                                 if ((memcmp(s->s3->read_sequence,
 551                                         "\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1))
 552                                         s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG;
 553                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 554                                         i--;
 555                                 }
 556                         /* TLS 1.0 does not bound the number of padding bytes by the block size.
 557                          * All of them must have value 'padding_length'. */
 558                         if (i > (int)rec->length)
 559                                 {
 560                                 /* Incorrect padding. SSLerr() and ssl3_alert are done
 561                                  * by caller: we don't want to reveal whether this is
 562                                  * a decryption error or a MAC verification failure
 563                                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
 564                                 return -1;
 565                                 }
 566                         for (j=(int)(l-i); j<(int)l; j++)
 567                                 {
 568                                 if (rec->data[j] != ii)
 569                                         {
 570                                         /* Incorrect padding */
 571                                         return -1;
 572                                         }
 573                                 }
 574                         rec->length-=i;
 575                         }
 576                 }
 577         return(1);
 578         }
 579
 580 int tls1_cert_verify_mac(SSL *s, EVP_MD_CTX *in_ctx, unsigned char *out)
 581         {
 582         unsigned int ret;
 583         EVP_MD_CTX ctx;
 584
 585         EVP_MD_CTX_init(&ctx);
 586         EVP_MD_CTX_copy_ex(&ctx,in_ctx);
 587         EVP_DigestFinal_ex(&ctx,out,&ret);
 588         EVP_MD_CTX_cleanup(&ctx);
 589         return((int)ret);
 590         }
 591
 592 int tls1_final_finish_mac(SSL *s, EVP_MD_CTX *in1_ctx, EVP_MD_CTX *in2_ctx,
 593              const char *str, int slen, unsigned char *out)
 594         {
 595         unsigned int i;
 596         EVP_MD_CTX ctx;
 597         unsigned char buf[TLS_MD_MAX_CONST_SIZE+MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 598         unsigned char *q,buf2[12];
 599
 600         q=buf;
 601         memcpy(q,str,slen);
 602         q+=slen;
 603
 604         EVP_MD_CTX_init(&ctx);
 605         EVP_MD_CTX_copy_ex(&ctx,in1_ctx);
 606         EVP_DigestFinal_ex(&ctx,q,&i);
 607         q+=i;
 608         EVP_MD_CTX_copy_ex(&ctx,in2_ctx);
 609         EVP_DigestFinal_ex(&ctx,q,&i);
 610         q+=i;
 611
 612         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(q-buf),
 613                 s->session->master_key,s->session->master_key_length,
 614                 out,buf2,12);
 615         EVP_MD_CTX_cleanup(&ctx);
 616
 617         return((int)12);
 618         }
 619
 620 int tls1_mac(SSL *ssl, unsigned char *md, int send)
 621         {
 622         SSL3_RECORD *rec;
 623         unsigned char *mac_sec,*seq;
 624         const EVP_MD *hash;
 625         unsigned int md_size;
 626         int i;
 627         HMAC_CTX hmac;
 628         unsigned char buf[5];
 629
 630         if (send)
 631                 {
 632                 rec= &(ssl->s3->wrec);
 633                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 634                 seq= &(ssl->s3->write_sequence[0]);
 635                 hash=ssl->write_hash;
 636                 }
 637         else
 638                 {
 639                 rec= &(ssl->s3->rrec);
 640                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 641                 seq= &(ssl->s3->read_sequence[0]);
 642                 hash=ssl->read_hash;
 643                 }
 644
 645         md_size=EVP_MD_size(hash);
 646
 647         buf[0]=rec->type;
 648         buf[1]=TLS1_VERSION_MAJOR;
 649         buf[2]=TLS1_VERSION_MINOR;
 650         buf[3]=rec->length>>8;
 651         buf[4]=rec->length&0xff;
 652
 653         /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */
 654         HMAC_CTX_init(&hmac);
 655         HMAC_Init(&hmac,mac_sec,EVP_MD_size(hash),hash);
 656         HMAC_Update(&hmac,seq,8);
 657         HMAC_Update(&hmac,buf,5);
 658         HMAC_Update(&hmac,rec->input,rec->length);
 659         HMAC_Final(&hmac,md,&md_size);
 660         HMAC_CTX_cleanup(&hmac);
 661
 662 #ifdef TLS_DEBUG
 663 printf("sec=");
 664 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); }
 665 printf("seq=");
 666 {int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); }
 667 printf("buf=");
 668 {int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); }
 669 printf("rec=");
 670 {unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); }
 671 #endif
 672
 673         for (i=7; i>=0; i--)
 674                 {
 675                 ++seq[i];
 676                 if (seq[i] != 0) break;
 677                 }
 678
 679 #ifdef TLS_DEBUG
 680 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); }
 681 #endif
 682         return(md_size);
 683         }
 684
 685 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 686              int len)
 687         {
 688         unsigned char buf[SSL3_RANDOM_SIZE*2+TLS_MD_MASTER_SECRET_CONST_SIZE];
 689         unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH];
 690
 691 #ifdef KSSL_DEBUG
 692         printf ("tls1_generate_master_secret(%p,%p, %p, %d)\n", s,out, p,len);
 693 #endif  /* KSSL_DEBUG */
 694
 695         /* Setup the stuff to munge */
 696         memcpy(buf,TLS_MD_MASTER_SECRET_CONST,
 697                 TLS_MD_MASTER_SECRET_CONST_SIZE);
 698         memcpy(&(buf[TLS_MD_MASTER_SECRET_CONST_SIZE]),
 699                 s->s3->client_random,SSL3_RANDOM_SIZE);
 700         memcpy(&(buf[SSL3_RANDOM_SIZE+TLS_MD_MASTER_SECRET_CONST_SIZE]),
 701                 s->s3->server_random,SSL3_RANDOM_SIZE);
 702         tls1_PRF(s->ctx->md5,s->ctx->sha1,
 703                 buf,TLS_MD_MASTER_SECRET_CONST_SIZE+SSL3_RANDOM_SIZE*2,p,len,
 704                 s->session->master_key,buff,SSL3_MASTER_SECRET_SIZE);
 705 #ifdef KSSL_DEBUG
 706         printf ("tls1_generate_master_secret() complete\n");
 707 #endif  /* KSSL_DEBUG */
 708         return(SSL3_MASTER_SECRET_SIZE);
 709         }
 710
 711 int tls1_alert_code(int code)
 712         {
 713         switch (code)
 714                 {
 715         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 716         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 717         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 718         case SSL_AD_DECRYPTION_FAILED:  return(TLS1_AD_DECRYPTION_FAILED);
 719         case SSL_AD_RECORD_OVERFLOW:    return(TLS1_AD_RECORD_OVERFLOW);
 720         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 721         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 722         case SSL_AD_NO_CERTIFICATE:     return(-1);
 723         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 724         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 725         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 726         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 727         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 728         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 729         case SSL_AD_UNKNOWN_CA:         return(TLS1_AD_UNKNOWN_CA);
 730         case SSL_AD_ACCESS_DENIED:      return(TLS1_AD_ACCESS_DENIED);
 731         case SSL_AD_DECODE_ERROR:       return(TLS1_AD_DECODE_ERROR);
 732         case SSL_AD_DECRYPT_ERROR:      return(TLS1_AD_DECRYPT_ERROR);
 733         case SSL_AD_EXPORT_RESTRICTION: return(TLS1_AD_EXPORT_RESTRICTION);
 734         case SSL_AD_PROTOCOL_VERSION:   return(TLS1_AD_PROTOCOL_VERSION);
 735         case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY);
 736         case SSL_AD_INTERNAL_ERROR:     return(TLS1_AD_INTERNAL_ERROR);
 737         case SSL_AD_USER_CANCELLED:     return(TLS1_AD_USER_CANCELLED);
 738         case SSL_AD_NO_RENEGOTIATION:   return(TLS1_AD_NO_RENEGOTIATION);
 739         default:                        return(-1);
 740                 }
 741         }
 742