crypto/openssl-0.9.7e/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  * 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/comp.h>
 115 #include <openssl/evp.h>
 116 #include <openssl/hmac.h>
 117 #include <openssl/md5.h>
 118 #include <openssl/fips.h>
 119
 120 static void tls1_P_hash(const EVP_MD *md, const unsigned char *sec,
 121                         int sec_len, unsigned char *seed, int seed_len,
 122                         unsigned char *out, int olen)
 123         {
 124         int chunk,n;
 125         unsigned int j;
 126         HMAC_CTX ctx;
 127         HMAC_CTX ctx_tmp;
 128         unsigned char A1[EVP_MAX_MD_SIZE];
 129         unsigned int A1_len;
 130
 131         chunk=EVP_MD_size(md);
 132
 133         HMAC_CTX_init(&ctx);
 134         HMAC_CTX_init(&ctx_tmp);
 135         HMAC_Init_ex(&ctx,sec,sec_len,md, NULL);
 136         HMAC_Init_ex(&ctx_tmp,sec,sec_len,md, NULL);
 137         HMAC_Update(&ctx,seed,seed_len);
 138         HMAC_Final(&ctx,A1,&A1_len);
 139
 140         n=0;
 141         for (;;)
 142                 {
 143                 HMAC_Init_ex(&ctx,NULL,0,NULL,NULL); /* re-init */
 144                 HMAC_Init_ex(&ctx_tmp,NULL,0,NULL,NULL); /* re-init */
 145                 HMAC_Update(&ctx,A1,A1_len);
 146                 HMAC_Update(&ctx_tmp,A1,A1_len);
 147                 HMAC_Update(&ctx,seed,seed_len);
 148
 149                 if (olen > chunk)
 150                         {
 151                         HMAC_Final(&ctx,out,&j);
 152                         out+=j;
 153                         olen-=j;
 154                         HMAC_Final(&ctx_tmp,A1,&A1_len); /* calc the next A1 value */
 155                         }
 156                 else    /* last one */
 157                         {
 158                         HMAC_Final(&ctx,A1,&A1_len);
 159                         memcpy(out,A1,olen);
 160                         break;
 161                         }
 162                 }
 163         HMAC_CTX_cleanup(&ctx);
 164         HMAC_CTX_cleanup(&ctx_tmp);
 165         OPENSSL_cleanse(A1,sizeof(A1));
 166         }
 167
 168 static void tls1_PRF(const EVP_MD *md5, const EVP_MD *sha1,
 169                      unsigned char *label, int label_len,
 170                      const unsigned char *sec, int slen, unsigned char *out1,
 171                      unsigned char *out2, int olen)
 172         {
 173         int len,i;
 174         const unsigned char *S1,*S2;
 175
 176         len=slen/2;
 177         S1=sec;
 178         S2= &(sec[len]);
 179         len+=(slen&1); /* add for odd, make longer */
 180
 181 #ifdef OPENSSL_FIPS
 182         FIPS_allow_md5(1);
 183 #endif
 184         tls1_P_hash(md5 ,S1,len,label,label_len,out1,olen);
 185 #ifdef OPENSSL_FIPS
 186         FIPS_allow_md5(0);
 187 #endif
 188         tls1_P_hash(sha1,S2,len,label,label_len,out2,olen);
 189
 190         for (i=0; i<olen; i++)
 191                 out1[i]^=out2[i];
 192         }
 193
 194 static void tls1_generate_key_block(SSL *s, unsigned char *km,
 195              unsigned char *tmp, int num)
 196         {
 197         unsigned char *p;
 198         unsigned char buf[SSL3_RANDOM_SIZE*2+
 199                 TLS_MD_MAX_CONST_SIZE];
 200         p=buf;
 201
 202         memcpy(p,TLS_MD_KEY_EXPANSION_CONST,
 203                 TLS_MD_KEY_EXPANSION_CONST_SIZE);
 204         p+=TLS_MD_KEY_EXPANSION_CONST_SIZE;
 205         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 206         p+=SSL3_RANDOM_SIZE;
 207         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 208         p+=SSL3_RANDOM_SIZE;
 209
 210         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),
 211                  s->session->master_key,s->session->master_key_length,
 212                  km,tmp,num);
 213 #ifdef KSSL_DEBUG
 214         printf("tls1_generate_key_block() ==> %d byte master_key =\n\t",
 215                 s->session->master_key_length);
 216         {
 217         int i;
 218         for (i=0; i < s->session->master_key_length; i++)
 219                 {
 220                 printf("%02X", s->session->master_key[i]);
 221                 }
 222         printf("\n");  }
 223 #endif    /* KSSL_DEBUG */
 224         }
 225
 226 int tls1_change_cipher_state(SSL *s, int which)
 227         {
 228         static const unsigned char empty[]="";
 229         unsigned char *p,*key_block,*mac_secret;
 230         unsigned char *exp_label,buf[TLS_MD_MAX_CONST_SIZE+
 231                 SSL3_RANDOM_SIZE*2];
 232         unsigned char tmp1[EVP_MAX_KEY_LENGTH];
 233         unsigned char tmp2[EVP_MAX_KEY_LENGTH];
 234         unsigned char iv1[EVP_MAX_IV_LENGTH*2];
 235         unsigned char iv2[EVP_MAX_IV_LENGTH*2];
 236         unsigned char *ms,*key,*iv,*er1,*er2;
 237         int client_write;
 238         EVP_CIPHER_CTX *dd;
 239         const EVP_CIPHER *c;
 240         const SSL_COMP *comp;
 241         const EVP_MD *m;
 242         int is_export,n,i,j,k,exp_label_len,cl;
 243         int reuse_dd = 0;
 244
 245         is_export=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
 246         c=s->s3->tmp.new_sym_enc;
 247         m=s->s3->tmp.new_hash;
 248         comp=s->s3->tmp.new_compression;
 249         key_block=s->s3->tmp.key_block;
 250
 251 #ifdef KSSL_DEBUG
 252         printf("tls1_change_cipher_state(which= %d) w/\n", which);
 253         printf("\talg= %ld, comp= %p\n", s->s3->tmp.new_cipher->algorithms,
 254                 comp);
 255         printf("\tevp_cipher == %p ==? &d_cbc_ede_cipher3\n", c);
 256         printf("\tevp_cipher: nid, blksz= %d, %d, keylen=%d, ivlen=%d\n",
 257                 c->nid,c->block_size,c->key_len,c->iv_len);
 258         printf("\tkey_block: len= %d, data= ", s->s3->tmp.key_block_length);
 259         {
 260         int i;
 261         for (i=0; i<s->s3->tmp.key_block_length; i++)
 262                 printf("%02x", key_block[i]);  printf("\n");
 263         }
 264 #endif  /* KSSL_DEBUG */
 265
 266         if (which & SSL3_CC_READ)
 267                 {
 268                 if (s->enc_read_ctx != NULL)
 269                         reuse_dd = 1;
 270                 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 271                         goto err;
 272                 dd= s->enc_read_ctx;
 273                 s->read_hash=m;
 274                 if (s->expand != NULL)
 275                         {
 276                         COMP_CTX_free(s->expand);
 277                         s->expand=NULL;
 278                         }
 279                 if (comp != NULL)
 280                         {
 281                         s->expand=COMP_CTX_new(comp->method);
 282                         if (s->expand == NULL)
 283                                 {
 284                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 285                                 goto err2;
 286                                 }
 287                         if (s->s3->rrec.comp == NULL)
 288                                 s->s3->rrec.comp=(unsigned char *)
 289                                         OPENSSL_malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH);
 290                         if (s->s3->rrec.comp == NULL)
 291                                 goto err;
 292                         }
 293                 memset(&(s->s3->read_sequence[0]),0,8);
 294                 mac_secret= &(s->s3->read_mac_secret[0]);
 295                 }
 296         else
 297                 {
 298                 if (s->enc_write_ctx != NULL)
 299                         reuse_dd = 1;
 300                 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 301                         goto err;
 302                 if ((s->enc_write_ctx == NULL) &&
 303                         ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
 304                         OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
 305                         goto err;
 306                 dd= s->enc_write_ctx;
 307                 s->write_hash=m;
 308                 if (s->compress != NULL)
 309                         {
 310                         COMP_CTX_free(s->compress);
 311                         s->compress=NULL;
 312                         }
 313                 if (comp != NULL)
 314                         {
 315                         s->compress=COMP_CTX_new(comp->method);
 316                         if (s->compress == NULL)
 317                                 {
 318                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 319                                 goto err2;
 320                                 }
 321                         }
 322                 memset(&(s->s3->write_sequence[0]),0,8);
 323                 mac_secret= &(s->s3->write_mac_secret[0]);
 324                 }
 325
 326         if (reuse_dd)
 327                 EVP_CIPHER_CTX_cleanup(dd);
 328         EVP_CIPHER_CTX_init(dd);
 329
 330         p=s->s3->tmp.key_block;
 331         i=EVP_MD_size(m);
 332         cl=EVP_CIPHER_key_length(c);
 333         j=is_export ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
 334                        cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
 335         /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 336         k=EVP_CIPHER_iv_length(c);
 337         er1= &(s->s3->client_random[0]);
 338         er2= &(s->s3->server_random[0]);
 339         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 340                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 341                 {
 342                 ms=  &(p[ 0]); n=i+i;
 343                 key= &(p[ n]); n+=j+j;
 344                 iv=  &(p[ n]); n+=k+k;
 345                 exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST;
 346                 exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE;
 347                 client_write=1;
 348                 }
 349         else
 350                 {
 351                 n=i;
 352                 ms=  &(p[ n]); n+=i+j;
 353                 key= &(p[ n]); n+=j+k;
 354                 iv=  &(p[ n]); n+=k;
 355                 exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST;
 356                 exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE;
 357                 client_write=0;
 358                 }
 359
 360         if (n > s->s3->tmp.key_block_length)
 361                 {
 362                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
 363                 goto err2;
 364                 }
 365
 366         memcpy(mac_secret,ms,i);
 367 #ifdef TLS_DEBUG
 368 printf("which = %04X\nmac key=",which);
 369 { int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); }
 370 #endif
 371         if (is_export)
 372                 {
 373                 /* In here I set both the read and write key/iv to the
 374                  * same value since only the correct one will be used :-).
 375                  */
 376                 p=buf;
 377                 memcpy(p,exp_label,exp_label_len);
 378                 p+=exp_label_len;
 379                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 380                 p+=SSL3_RANDOM_SIZE;
 381                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 382                 p+=SSL3_RANDOM_SIZE;
 383                 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),key,j,
 384                          tmp1,tmp2,EVP_CIPHER_key_length(c));
 385                 key=tmp1;
 386
 387                 if (k > 0)
 388                         {
 389                         p=buf;
 390                         memcpy(p,TLS_MD_IV_BLOCK_CONST,
 391                                 TLS_MD_IV_BLOCK_CONST_SIZE);
 392                         p+=TLS_MD_IV_BLOCK_CONST_SIZE;
 393                         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 394                         p+=SSL3_RANDOM_SIZE;
 395                         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 396                         p+=SSL3_RANDOM_SIZE;
 397                         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,p-buf,empty,0,
 398                                  iv1,iv2,k*2);
 399                         if (client_write)
 400                                 iv=iv1;
 401                         else
 402                                 iv= &(iv1[k]);
 403                         }
 404                 }
 405
 406         s->session->key_arg_length=0;
 407 #ifdef KSSL_DEBUG
 408         {
 409         int i;
 410         printf("EVP_CipherInit_ex(dd,c,key=,iv=,which)\n");
 411         printf("\tkey= "); for (i=0; i<c->key_len; i++) printf("%02x", key[i]);
 412         printf("\n");
 413         printf("\t iv= "); for (i=0; i<c->iv_len; i++) printf("%02x", iv[i]);
 414         printf("\n");
 415         }
 416 #endif  /* KSSL_DEBUG */
 417
 418         EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
 419 #ifdef TLS_DEBUG
 420 printf("which = %04X\nkey=",which);
 421 { int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); }
 422 printf("\niv=");
 423 { int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); }
 424 printf("\n");
 425 #endif
 426
 427         OPENSSL_cleanse(tmp1,sizeof(tmp1));
 428         OPENSSL_cleanse(tmp2,sizeof(tmp1));
 429         OPENSSL_cleanse(iv1,sizeof(iv1));
 430         OPENSSL_cleanse(iv2,sizeof(iv2));
 431         return(1);
 432 err:
 433         SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 434 err2:
 435         return(0);
 436         }
 437
 438 int tls1_setup_key_block(SSL *s)
 439         {
 440         unsigned char *p1,*p2;
 441         const EVP_CIPHER *c;
 442         const EVP_MD *hash;
 443         int num;
 444         SSL_COMP *comp;
 445
 446 #ifdef KSSL_DEBUG
 447         printf ("tls1_setup_key_block()\n");
 448 #endif  /* KSSL_DEBUG */
 449
 450         if (s->s3->tmp.key_block_length != 0)
 451                 return(1);
 452
 453         if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
 454                 {
 455                 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 456                 return(0);
 457                 }
 458
 459         s->s3->tmp.new_sym_enc=c;
 460         s->s3->tmp.new_hash=hash;
 461
 462         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
 463         num*=2;
 464
 465         ssl3_cleanup_key_block(s);
 466
 467         if ((p1=(unsigned char *)OPENSSL_malloc(num)) == NULL)
 468                 goto err;
 469         if ((p2=(unsigned char *)OPENSSL_malloc(num)) == NULL)
 470                 goto err;
 471
 472         s->s3->tmp.key_block_length=num;
 473         s->s3->tmp.key_block=p1;
 474
 475
 476 #ifdef TLS_DEBUG
 477 printf("client random\n");
 478 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); }
 479 printf("server random\n");
 480 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); }
 481 printf("pre-master\n");
 482 { int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); }
 483 #endif
 484         tls1_generate_key_block(s,p1,p2,num);
 485         OPENSSL_cleanse(p2,num);
 486         OPENSSL_free(p2);
 487 #ifdef TLS_DEBUG
 488 printf("\nkey block\n");
 489 { int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); }
 490 #endif
 491
 492         if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
 493                 {
 494                 /* enable vulnerability countermeasure for CBC ciphers with
 495                  * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
 496                  */
 497                 s->s3->need_empty_fragments = 1;
 498
 499                 if (s->session->cipher != NULL)
 500                         {
 501                         if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL)
 502                                 s->s3->need_empty_fragments = 0;
 503
 504 #ifndef OPENSSL_NO_RC4
 505                         if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4)
 506                                 s->s3->need_empty_fragments = 0;
 507 #endif
 508                         }
 509                 }
 510
 511         return(1);
 512 err:
 513         SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 514         return(0);
 515         }
 516
 517 int tls1_enc(SSL *s, int send)
 518         {
 519         SSL3_RECORD *rec;
 520         EVP_CIPHER_CTX *ds;
 521         unsigned long l;
 522         int bs,i,ii,j,k,n=0;
 523         const EVP_CIPHER *enc;
 524
 525         if (send)
 526                 {
 527                 if (s->write_hash != NULL)
 528                         n=EVP_MD_size(s->write_hash);
 529                 ds=s->enc_write_ctx;
 530                 rec= &(s->s3->wrec);
 531                 if (s->enc_write_ctx == NULL)
 532                         enc=NULL;
 533                 else
 534                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 535                 }
 536         else
 537                 {
 538                 if (s->read_hash != NULL)
 539                         n=EVP_MD_size(s->read_hash);
 540                 ds=s->enc_read_ctx;
 541                 rec= &(s->s3->rrec);
 542                 if (s->enc_read_ctx == NULL)
 543                         enc=NULL;
 544                 else
 545                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 546                 }
 547
 548 #ifdef KSSL_DEBUG
 549         printf("tls1_enc(%d)\n", send);
 550 #endif    /* KSSL_DEBUG */
 551
 552         if ((s->session == NULL) || (ds == NULL) ||
 553                 (enc == NULL))
 554                 {
 555                 memmove(rec->data,rec->input,rec->length);
 556                 rec->input=rec->data;
 557                 }
 558         else
 559                 {
 560                 l=rec->length;
 561                 bs=EVP_CIPHER_block_size(ds->cipher);
 562
 563                 if ((bs != 1) && send)
 564                         {
 565                         i=bs-((int)l%bs);
 566
 567                         /* Add weird padding of upto 256 bytes */
 568
 569                         /* we need to add 'i' padding bytes of value j */
 570                         j=i-1;
 571                         if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG)
 572                                 {
 573                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 574                                         j++;
 575                                 }
 576                         for (k=(int)l; k<(int)(l+i); k++)
 577                                 rec->input[k]=j;
 578                         l+=i;
 579                         rec->length+=i;
 580                         }
 581
 582 #ifdef KSSL_DEBUG
 583                 {
 584                 unsigned long ui;
 585                 printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n",
 586                         ds,rec->data,rec->input,l);
 587                 printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n",
 588                         ds->buf_len, ds->cipher->key_len,
 589                         DES_KEY_SZ, DES_SCHEDULE_SZ,
 590                         ds->cipher->iv_len);
 591                 printf("\t\tIV: ");
 592                 for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]);
 593                 printf("\n");
 594                 printf("\trec->input=");
 595                 for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]);
 596                 printf("\n");
 597                 }
 598 #endif  /* KSSL_DEBUG */
 599
 600                 if (!send)
 601                         {
 602                         if (l == 0 || l%bs != 0)
 603                                 {
 604                                 SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 605                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
 606                                 return 0;
 607                                 }
 608                         }
 609
 610                 EVP_Cipher(ds,rec->data,rec->input,l);
 611
 612 #ifdef KSSL_DEBUG
 613                 {
 614                 unsigned long i;
 615                 printf("\trec->data=");
 616                 for (i=0; i<l; i++)
 617                         printf(" %02x", rec->data[i]);  printf("\n");
 618                 }
 619 #endif  /* KSSL_DEBUG */
 620
 621                 if ((bs != 1) && !send)
 622                         {
 623                         ii=i=rec->data[l-1]; /* padding_length */
 624                         i++;
 625                         if (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG)
 626                                 {
 627                                 /* First packet is even in size, so check */
 628                                 if ((memcmp(s->s3->read_sequence,
 629                                         "\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1))
 630                                         s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG;
 631                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 632                                         i--;
 633                                 }
 634                         /* TLS 1.0 does not bound the number of padding bytes by the block size.
 635                          * All of them must have value 'padding_length'. */
 636                         if (i > (int)rec->length)
 637                                 {
 638                                 /* Incorrect padding. SSLerr() and ssl3_alert are done
 639                                  * by caller: we don't want to reveal whether this is
 640                                  * a decryption error or a MAC verification failure
 641                                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
 642                                 return -1;
 643                                 }
 644                         for (j=(int)(l-i); j<(int)l; j++)
 645                                 {
 646                                 if (rec->data[j] != ii)
 647                                         {
 648                                         /* Incorrect padding */
 649                                         return -1;
 650                                         }
 651                                 }
 652                         rec->length-=i;
 653                         }
 654                 }
 655         return(1);
 656         }
 657
 658 int tls1_cert_verify_mac(SSL *s, EVP_MD_CTX *in_ctx, unsigned char *out)
 659         {
 660         unsigned int ret;
 661         EVP_MD_CTX ctx;
 662
 663         EVP_MD_CTX_init(&ctx);
 664         EVP_MD_CTX_copy_ex(&ctx,in_ctx);
 665 #ifdef OPENSSL_FIPS
 666         FIPS_allow_md5(1);
 667 #endif
 668         EVP_DigestFinal_ex(&ctx,out,&ret);
 669 #ifdef OPENSSL_FIPS
 670         FIPS_allow_md5(0);
 671 #endif
 672         EVP_MD_CTX_cleanup(&ctx);
 673         return((int)ret);
 674         }
 675
 676 int tls1_final_finish_mac(SSL *s, EVP_MD_CTX *in1_ctx, EVP_MD_CTX *in2_ctx,
 677              const char *str, int slen, unsigned char *out)
 678         {
 679         unsigned int i;
 680         EVP_MD_CTX ctx;
 681         unsigned char buf[TLS_MD_MAX_CONST_SIZE+MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 682         unsigned char *q,buf2[12];
 683
 684         q=buf;
 685         memcpy(q,str,slen);
 686         q+=slen;
 687
 688         EVP_MD_CTX_init(&ctx);
 689         EVP_MD_CTX_copy_ex(&ctx,in1_ctx);
 690 #ifdef OPENSSL_FIPS
 691         FIPS_allow_md5(1);
 692 #endif
 693         EVP_DigestFinal_ex(&ctx,q,&i);
 694 #ifdef OPENSSL_FIPS
 695         FIPS_allow_md5(0);
 696 #endif
 697         q+=i;
 698         EVP_MD_CTX_copy_ex(&ctx,in2_ctx);
 699         EVP_DigestFinal_ex(&ctx,q,&i);
 700         q+=i;
 701
 702         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(q-buf),
 703                 s->session->master_key,s->session->master_key_length,
 704                 out,buf2,sizeof buf2);
 705         EVP_MD_CTX_cleanup(&ctx);
 706
 707         return sizeof buf2;
 708         }
 709
 710 int tls1_mac(SSL *ssl, unsigned char *md, int send)
 711         {
 712         SSL3_RECORD *rec;
 713         unsigned char *mac_sec,*seq;
 714         const EVP_MD *hash;
 715         unsigned int md_size;
 716         int i;
 717         HMAC_CTX hmac;
 718         unsigned char buf[5];
 719
 720         if (send)
 721                 {
 722                 rec= &(ssl->s3->wrec);
 723                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 724                 seq= &(ssl->s3->write_sequence[0]);
 725                 hash=ssl->write_hash;
 726                 }
 727         else
 728                 {
 729                 rec= &(ssl->s3->rrec);
 730                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 731                 seq= &(ssl->s3->read_sequence[0]);
 732                 hash=ssl->read_hash;
 733                 }
 734
 735         md_size=EVP_MD_size(hash);
 736
 737         buf[0]=rec->type;
 738         buf[1]=TLS1_VERSION_MAJOR;
 739         buf[2]=TLS1_VERSION_MINOR;
 740         buf[3]=rec->length>>8;
 741         buf[4]=rec->length&0xff;
 742
 743         /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */
 744         HMAC_CTX_init(&hmac);
 745         HMAC_Init_ex(&hmac,mac_sec,EVP_MD_size(hash),hash,NULL);
 746         HMAC_Update(&hmac,seq,8);
 747         HMAC_Update(&hmac,buf,5);
 748         HMAC_Update(&hmac,rec->input,rec->length);
 749         HMAC_Final(&hmac,md,&md_size);
 750         HMAC_CTX_cleanup(&hmac);
 751
 752 #ifdef TLS_DEBUG
 753 printf("sec=");
 754 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); }
 755 printf("seq=");
 756 {int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); }
 757 printf("buf=");
 758 {int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); }
 759 printf("rec=");
 760 {unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); }
 761 #endif
 762
 763         for (i=7; i>=0; i--)
 764                 {
 765                 ++seq[i];
 766                 if (seq[i] != 0) break;
 767                 }
 768
 769 #ifdef TLS_DEBUG
 770 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); }
 771 #endif
 772         return(md_size);
 773         }
 774
 775 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 776              int len)
 777         {
 778         unsigned char buf[SSL3_RANDOM_SIZE*2+TLS_MD_MASTER_SECRET_CONST_SIZE];
 779         unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH];
 780
 781 #ifdef KSSL_DEBUG
 782         printf ("tls1_generate_master_secret(%p,%p, %p, %d)\n", s,out, p,len);
 783 #endif  /* KSSL_DEBUG */
 784
 785         /* Setup the stuff to munge */
 786         memcpy(buf,TLS_MD_MASTER_SECRET_CONST,
 787                 TLS_MD_MASTER_SECRET_CONST_SIZE);
 788         memcpy(&(buf[TLS_MD_MASTER_SECRET_CONST_SIZE]),
 789                 s->s3->client_random,SSL3_RANDOM_SIZE);
 790         memcpy(&(buf[SSL3_RANDOM_SIZE+TLS_MD_MASTER_SECRET_CONST_SIZE]),
 791                 s->s3->server_random,SSL3_RANDOM_SIZE);
 792         tls1_PRF(s->ctx->md5,s->ctx->sha1,
 793                 buf,TLS_MD_MASTER_SECRET_CONST_SIZE+SSL3_RANDOM_SIZE*2,p,len,
 794                 s->session->master_key,buff,sizeof buff);
 795 #ifdef KSSL_DEBUG
 796         printf ("tls1_generate_master_secret() complete\n");
 797 #endif  /* KSSL_DEBUG */
 798         return(SSL3_MASTER_SECRET_SIZE);
 799         }
 800
 801 int tls1_alert_code(int code)
 802         {
 803         switch (code)
 804                 {
 805         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 806         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 807         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 808         case SSL_AD_DECRYPTION_FAILED:  return(TLS1_AD_DECRYPTION_FAILED);
 809         case SSL_AD_RECORD_OVERFLOW:    return(TLS1_AD_RECORD_OVERFLOW);
 810         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 811         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 812         case SSL_AD_NO_CERTIFICATE:     return(-1);
 813         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 814         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 815         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 816         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 817         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 818         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 819         case SSL_AD_UNKNOWN_CA:         return(TLS1_AD_UNKNOWN_CA);
 820         case SSL_AD_ACCESS_DENIED:      return(TLS1_AD_ACCESS_DENIED);
 821         case SSL_AD_DECODE_ERROR:       return(TLS1_AD_DECODE_ERROR);
 822         case SSL_AD_DECRYPT_ERROR:      return(TLS1_AD_DECRYPT_ERROR);
 823         case SSL_AD_EXPORT_RESTRICTION: return(TLS1_AD_EXPORT_RESTRICTION);
 824         case SSL_AD_PROTOCOL_VERSION:   return(TLS1_AD_PROTOCOL_VERSION);
 825         case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY);
 826         case SSL_AD_INTERNAL_ERROR:     return(TLS1_AD_INTERNAL_ERROR);
 827         case SSL_AD_USER_CANCELLED:     return(TLS1_AD_USER_CANCELLED);
 828         case SSL_AD_NO_RENEGOTIATION:   return(TLS1_AD_NO_RENEGOTIATION);
 829         default:                        return(-1);
 830                 }
 831         }
 832