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