crypto/openssl-0.9/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
 119 static void tls1_P_hash(const EVP_MD *md, const unsigned char *sec,
 120                         int sec_len, unsigned char *seed, int seed_len,
 121                         unsigned char *out, int olen)
 122         {
 123         int chunk,n;
 124         unsigned int j;
 125         HMAC_CTX ctx;
 126         HMAC_CTX ctx_tmp;
 127         unsigned char A1[EVP_MAX_MD_SIZE];
 128         unsigned int A1_len;
 129
 130         chunk=EVP_MD_size(md);
 131
 132         HMAC_CTX_init(&ctx);
 133         HMAC_CTX_init(&ctx_tmp);
 134         HMAC_Init_ex(&ctx,sec,sec_len,md, NULL);
 135         HMAC_Init_ex(&ctx_tmp,sec,sec_len,md, NULL);
 136         HMAC_Update(&ctx,seed,seed_len);
 137         HMAC_Final(&ctx,A1,&A1_len);
 138
 139         n=0;
 140         for (;;)
 141                 {
 142                 HMAC_Init_ex(&ctx,NULL,0,NULL,NULL); /* re-init */
 143                 HMAC_Init_ex(&ctx_tmp,NULL,0,NULL,NULL); /* re-init */
 144                 HMAC_Update(&ctx,A1,A1_len);
 145                 HMAC_Update(&ctx_tmp,A1,A1_len);
 146                 HMAC_Update(&ctx,seed,seed_len);
 147
 148                 if (olen > chunk)
 149                         {
 150                         HMAC_Final(&ctx,out,&j);
 151                         out+=j;
 152                         olen-=j;
 153                         HMAC_Final(&ctx_tmp,A1,&A1_len); /* calc the next A1 value */
 154                         }
 155                 else    /* last one */
 156                         {
 157                         HMAC_Final(&ctx,A1,&A1_len);
 158                         memcpy(out,A1,olen);
 159                         break;
 160                         }
 161                 }
 162         HMAC_CTX_cleanup(&ctx);
 163         HMAC_CTX_cleanup(&ctx_tmp);
 164         OPENSSL_cleanse(A1,sizeof(A1));
 165         }
 166
 167 static void tls1_PRF(const EVP_MD *md5, const EVP_MD *sha1,
 168                      unsigned char *label, int label_len,
 169                      const unsigned char *sec, int slen, unsigned char *out1,
 170                      unsigned char *out2, int olen)
 171         {
 172         int len,i;
 173         const unsigned char *S1,*S2;
 174
 175         len=slen/2;
 176         S1=sec;
 177         S2= &(sec[len]);
 178         len+=(slen&1); /* add for odd, make longer */
 179
 180
 181         tls1_P_hash(md5 ,S1,len,label,label_len,out1,olen);
 182         tls1_P_hash(sha1,S2,len,label,label_len,out2,olen);
 183
 184         for (i=0; i<olen; i++)
 185                 out1[i]^=out2[i];
 186         }
 187
 188 static void tls1_generate_key_block(SSL *s, unsigned char *km,
 189              unsigned char *tmp, int num)
 190         {
 191         unsigned char *p;
 192         unsigned char buf[SSL3_RANDOM_SIZE*2+
 193                 TLS_MD_MAX_CONST_SIZE];
 194         p=buf;
 195
 196         memcpy(p,TLS_MD_KEY_EXPANSION_CONST,
 197                 TLS_MD_KEY_EXPANSION_CONST_SIZE);
 198         p+=TLS_MD_KEY_EXPANSION_CONST_SIZE;
 199         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 200         p+=SSL3_RANDOM_SIZE;
 201         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 202         p+=SSL3_RANDOM_SIZE;
 203
 204         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),
 205                  s->session->master_key,s->session->master_key_length,
 206                  km,tmp,num);
 207 #ifdef KSSL_DEBUG
 208         printf("tls1_generate_key_block() ==> %d byte master_key =\n\t",
 209                 s->session->master_key_length);
 210         {
 211         int i;
 212         for (i=0; i < s->session->master_key_length; i++)
 213                 {
 214                 printf("%02X", s->session->master_key[i]);
 215                 }
 216         printf("\n");  }
 217 #endif    /* KSSL_DEBUG */
 218         }
 219
 220 int tls1_change_cipher_state(SSL *s, int which)
 221         {
 222         static const unsigned char empty[]="";
 223         unsigned char *p,*key_block,*mac_secret;
 224         unsigned char *exp_label,buf[TLS_MD_MAX_CONST_SIZE+
 225                 SSL3_RANDOM_SIZE*2];
 226         unsigned char tmp1[EVP_MAX_KEY_LENGTH];
 227         unsigned char tmp2[EVP_MAX_KEY_LENGTH];
 228         unsigned char iv1[EVP_MAX_IV_LENGTH*2];
 229         unsigned char iv2[EVP_MAX_IV_LENGTH*2];
 230         unsigned char *ms,*key,*iv,*er1,*er2;
 231         int client_write;
 232         EVP_CIPHER_CTX *dd;
 233         const EVP_CIPHER *c;
 234 #ifndef OPENSSL_NO_COMP
 235         const SSL_COMP *comp;
 236 #endif
 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 #ifndef OPENSSL_NO_COMP
 245         comp=s->s3->tmp.new_compression;
 246 #endif
 247         key_block=s->s3->tmp.key_block;
 248
 249 #ifdef KSSL_DEBUG
 250         printf("tls1_change_cipher_state(which= %d) w/\n", which);
 251         printf("\talg= %ld, comp= %p\n", s->s3->tmp.new_cipher->algorithms,
 252                 comp);
 253         printf("\tevp_cipher == %p ==? &d_cbc_ede_cipher3\n", c);
 254         printf("\tevp_cipher: nid, blksz= %d, %d, keylen=%d, ivlen=%d\n",
 255                 c->nid,c->block_size,c->key_len,c->iv_len);
 256         printf("\tkey_block: len= %d, data= ", s->s3->tmp.key_block_length);
 257         {
 258         int i;
 259         for (i=0; i<s->s3->tmp.key_block_length; i++)
 260                 printf("%02x", key_block[i]);  printf("\n");
 261         }
 262 #endif  /* KSSL_DEBUG */
 263
 264         if (which & SSL3_CC_READ)
 265                 {
 266                 if (s->enc_read_ctx != NULL)
 267                         reuse_dd = 1;
 268                 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 269                         goto err;
 270                 else
 271                         /* make sure it's intialized in case we exit later with an error */
 272                         EVP_CIPHER_CTX_init(s->enc_read_ctx);
 273                 dd= s->enc_read_ctx;
 274                 s->read_hash=m;
 275 #ifndef OPENSSL_NO_COMP
 276                 if (s->expand != NULL)
 277                         {
 278                         COMP_CTX_free(s->expand);
 279                         s->expand=NULL;
 280                         }
 281                 if (comp != NULL)
 282                         {
 283                         s->expand=COMP_CTX_new(comp->method);
 284                         if (s->expand == NULL)
 285                                 {
 286                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 287                                 goto err2;
 288                                 }
 289                         if (s->s3->rrec.comp == NULL)
 290                                 s->s3->rrec.comp=(unsigned char *)
 291                                         OPENSSL_malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH);
 292                         if (s->s3->rrec.comp == NULL)
 293                                 goto err;
 294                         }
 295 #endif
 296                 /* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
 297                 if (s->version != DTLS1_VERSION)
 298                         memset(&(s->s3->read_sequence[0]),0,8);
 299                 mac_secret= &(s->s3->read_mac_secret[0]);
 300                 }
 301         else
 302                 {
 303                 if (s->enc_write_ctx != NULL)
 304                         reuse_dd = 1;
 305                 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 306                         goto err;
 307                 else
 308                         /* make sure it's intialized in case we exit later with an error */
 309                         EVP_CIPHER_CTX_init(s->enc_write_ctx);
 310                 dd= s->enc_write_ctx;
 311                 s->write_hash=m;
 312 #ifndef OPENSSL_NO_COMP
 313                 if (s->compress != NULL)
 314                         {
 315                         COMP_CTX_free(s->compress);
 316                         s->compress=NULL;
 317                         }
 318                 if (comp != NULL)
 319                         {
 320                         s->compress=COMP_CTX_new(comp->method);
 321                         if (s->compress == NULL)
 322                                 {
 323                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 324                                 goto err2;
 325                                 }
 326                         }
 327 #endif
 328                 /* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
 329                 if (s->version != DTLS1_VERSION)
 330                         memset(&(s->s3->write_sequence[0]),0,8);
 331                 mac_secret= &(s->s3->write_mac_secret[0]);
 332                 }
 333
 334         if (reuse_dd)
 335                 EVP_CIPHER_CTX_cleanup(dd);
 336
 337         p=s->s3->tmp.key_block;
 338         i=EVP_MD_size(m);
 339         cl=EVP_CIPHER_key_length(c);
 340         j=is_export ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
 341                        cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
 342         /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 343         k=EVP_CIPHER_iv_length(c);
 344         er1= &(s->s3->client_random[0]);
 345         er2= &(s->s3->server_random[0]);
 346         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 347                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 348                 {
 349                 ms=  &(p[ 0]); n=i+i;
 350                 key= &(p[ n]); n+=j+j;
 351                 iv=  &(p[ n]); n+=k+k;
 352                 exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST;
 353                 exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE;
 354                 client_write=1;
 355                 }
 356         else
 357                 {
 358                 n=i;
 359                 ms=  &(p[ n]); n+=i+j;
 360                 key= &(p[ n]); n+=j+k;
 361                 iv=  &(p[ n]); n+=k;
 362                 exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST;
 363                 exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE;
 364                 client_write=0;
 365                 }
 366
 367         if (n > s->s3->tmp.key_block_length)
 368                 {
 369                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
 370                 goto err2;
 371                 }
 372
 373         memcpy(mac_secret,ms,i);
 374 #ifdef TLS_DEBUG
 375 printf("which = %04X\nmac key=",which);
 376 { int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); }
 377 #endif
 378         if (is_export)
 379                 {
 380                 /* In here I set both the read and write key/iv to the
 381                  * same value since only the correct one will be used :-).
 382                  */
 383                 p=buf;
 384                 memcpy(p,exp_label,exp_label_len);
 385                 p+=exp_label_len;
 386                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 387                 p+=SSL3_RANDOM_SIZE;
 388                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 389                 p+=SSL3_RANDOM_SIZE;
 390                 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),key,j,
 391                          tmp1,tmp2,EVP_CIPHER_key_length(c));
 392                 key=tmp1;
 393
 394                 if (k > 0)
 395                         {
 396                         p=buf;
 397                         memcpy(p,TLS_MD_IV_BLOCK_CONST,
 398                                 TLS_MD_IV_BLOCK_CONST_SIZE);
 399                         p+=TLS_MD_IV_BLOCK_CONST_SIZE;
 400                         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 401                         p+=SSL3_RANDOM_SIZE;
 402                         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 403                         p+=SSL3_RANDOM_SIZE;
 404                         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,p-buf,empty,0,
 405                                  iv1,iv2,k*2);
 406                         if (client_write)
 407                                 iv=iv1;
 408                         else
 409                                 iv= &(iv1[k]);
 410                         }
 411                 }
 412
 413         s->session->key_arg_length=0;
 414 #ifdef KSSL_DEBUG
 415         {
 416         int i;
 417         printf("EVP_CipherInit_ex(dd,c,key=,iv=,which)\n");
 418         printf("\tkey= "); for (i=0; i<c->key_len; i++) printf("%02x", key[i]);
 419         printf("\n");
 420         printf("\t iv= "); for (i=0; i<c->iv_len; i++) printf("%02x", iv[i]);
 421         printf("\n");
 422         }
 423 #endif  /* KSSL_DEBUG */
 424
 425         EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
 426 #ifdef TLS_DEBUG
 427 printf("which = %04X\nkey=",which);
 428 { int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); }
 429 printf("\niv=");
 430 { int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); }
 431 printf("\n");
 432 #endif
 433
 434         OPENSSL_cleanse(tmp1,sizeof(tmp1));
 435         OPENSSL_cleanse(tmp2,sizeof(tmp1));
 436         OPENSSL_cleanse(iv1,sizeof(iv1));
 437         OPENSSL_cleanse(iv2,sizeof(iv2));
 438         return(1);
 439 err:
 440         SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 441 err2:
 442         return(0);
 443         }
 444
 445 int tls1_setup_key_block(SSL *s)
 446         {
 447         unsigned char *p1,*p2;
 448         const EVP_CIPHER *c;
 449         const EVP_MD *hash;
 450         int num;
 451         SSL_COMP *comp;
 452
 453 #ifdef KSSL_DEBUG
 454         printf ("tls1_setup_key_block()\n");
 455 #endif  /* KSSL_DEBUG */
 456
 457         if (s->s3->tmp.key_block_length != 0)
 458                 return(1);
 459
 460         if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
 461                 {
 462                 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 463                 return(0);
 464                 }
 465
 466         s->s3->tmp.new_sym_enc=c;
 467         s->s3->tmp.new_hash=hash;
 468
 469         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
 470         num*=2;
 471
 472         ssl3_cleanup_key_block(s);
 473
 474         if ((p1=(unsigned char *)OPENSSL_malloc(num)) == NULL)
 475                 goto err;
 476         if ((p2=(unsigned char *)OPENSSL_malloc(num)) == NULL)
 477                 goto err;
 478
 479         s->s3->tmp.key_block_length=num;
 480         s->s3->tmp.key_block=p1;
 481
 482
 483 #ifdef TLS_DEBUG
 484 printf("client random\n");
 485 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); }
 486 printf("server random\n");
 487 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); }
 488 printf("pre-master\n");
 489 { int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); }
 490 #endif
 491         tls1_generate_key_block(s,p1,p2,num);
 492         OPENSSL_cleanse(p2,num);
 493         OPENSSL_free(p2);
 494 #ifdef TLS_DEBUG
 495 printf("\nkey block\n");
 496 { int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); }
 497 #endif
 498
 499         if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
 500                 {
 501                 /* enable vulnerability countermeasure for CBC ciphers with
 502                  * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
 503                  */
 504                 s->s3->need_empty_fragments = 1;
 505
 506                 if (s->session->cipher != NULL)
 507                         {
 508                         if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL)
 509                                 s->s3->need_empty_fragments = 0;
 510
 511 #ifndef OPENSSL_NO_RC4
 512                         if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4)
 513                                 s->s3->need_empty_fragments = 0;
 514 #endif
 515                         }
 516                 }
 517
 518         return(1);
 519 err:
 520         SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 521         return(0);
 522         }
 523
 524 int tls1_enc(SSL *s, int send)
 525         {
 526         SSL3_RECORD *rec;
 527         EVP_CIPHER_CTX *ds;
 528         unsigned long l;
 529         int bs,i,ii,j,k,n=0;
 530         const EVP_CIPHER *enc;
 531
 532         if (send)
 533                 {
 534                 if (s->write_hash != NULL)
 535                         n=EVP_MD_size(s->write_hash);
 536                 ds=s->enc_write_ctx;
 537                 rec= &(s->s3->wrec);
 538                 if (s->enc_write_ctx == NULL)
 539                         enc=NULL;
 540                 else
 541                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 542                 }
 543         else
 544                 {
 545                 if (s->read_hash != NULL)
 546                         n=EVP_MD_size(s->read_hash);
 547                 ds=s->enc_read_ctx;
 548                 rec= &(s->s3->rrec);
 549                 if (s->enc_read_ctx == NULL)
 550                         enc=NULL;
 551                 else
 552                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 553                 }
 554
 555 #ifdef KSSL_DEBUG
 556         printf("tls1_enc(%d)\n", send);
 557 #endif    /* KSSL_DEBUG */
 558
 559         if ((s->session == NULL) || (ds == NULL) ||
 560                 (enc == NULL))
 561                 {
 562                 memmove(rec->data,rec->input,rec->length);
 563                 rec->input=rec->data;
 564                 }
 565         else
 566                 {
 567                 l=rec->length;
 568                 bs=EVP_CIPHER_block_size(ds->cipher);
 569
 570                 if ((bs != 1) && send)
 571                         {
 572                         i=bs-((int)l%bs);
 573
 574                         /* Add weird padding of upto 256 bytes */
 575
 576                         /* we need to add 'i' padding bytes of value j */
 577                         j=i-1;
 578                         if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG)
 579                                 {
 580                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 581                                         j++;
 582                                 }
 583                         for (k=(int)l; k<(int)(l+i); k++)
 584                                 rec->input[k]=j;
 585                         l+=i;
 586                         rec->length+=i;
 587                         }
 588
 589 #ifdef KSSL_DEBUG
 590                 {
 591                 unsigned long ui;
 592                 printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n",
 593                         ds,rec->data,rec->input,l);
 594                 printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n",
 595                         ds->buf_len, ds->cipher->key_len,
 596                         DES_KEY_SZ, DES_SCHEDULE_SZ,
 597                         ds->cipher->iv_len);
 598                 printf("\t\tIV: ");
 599                 for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]);
 600                 printf("\n");
 601                 printf("\trec->input=");
 602                 for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]);
 603                 printf("\n");
 604                 }
 605 #endif  /* KSSL_DEBUG */
 606
 607                 if (!send)
 608                         {
 609                         if (l == 0 || l%bs != 0)
 610                                 {
 611                                 SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 612                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
 613                                 return 0;
 614                                 }
 615                         }
 616
 617                 EVP_Cipher(ds,rec->data,rec->input,l);
 618
 619 #ifdef KSSL_DEBUG
 620                 {
 621                 unsigned long i;
 622                 printf("\trec->data=");
 623                 for (i=0; i<l; i++)
 624                         printf(" %02x", rec->data[i]);  printf("\n");
 625                 }
 626 #endif  /* KSSL_DEBUG */
 627
 628                 if ((bs != 1) && !send)
 629                         {
 630                         ii=i=rec->data[l-1]; /* padding_length */
 631                         i++;
 632                         /* NB: if compression is in operation the first packet
 633                          * may not be of even length so the padding bug check
 634                          * cannot be performed. This bug workaround has been
 635                          * around since SSLeay so hopefully it is either fixed
 636                          * now or no buggy implementation supports compression
 637                          * [steve]
 638                          */
 639                         if ( (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG)
 640                                 && !s->expand)
 641                                 {
 642                                 /* First packet is even in size, so check */
 643                                 if ((memcmp(s->s3->read_sequence,
 644                                         "\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1))
 645                                         s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG;
 646                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 647                                         i--;
 648                                 }
 649                         /* TLS 1.0 does not bound the number of padding bytes by the block size.
 650                          * All of them must have value 'padding_length'. */
 651                         if (i > (int)rec->length)
 652                                 {
 653                                 /* Incorrect padding. SSLerr() and ssl3_alert are done
 654                                  * by caller: we don't want to reveal whether this is
 655                                  * a decryption error or a MAC verification failure
 656                                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
 657                                 return -1;
 658                                 }
 659                         for (j=(int)(l-i); j<(int)l; j++)
 660                                 {
 661                                 if (rec->data[j] != ii)
 662                                         {
 663                                         /* Incorrect padding */
 664                                         return -1;
 665                                         }
 666                                 }
 667                         rec->length-=i;
 668                         }
 669                 }
 670         return(1);
 671         }
 672
 673 int tls1_cert_verify_mac(SSL *s, EVP_MD_CTX *in_ctx, unsigned char *out)
 674         {
 675         unsigned int ret;
 676         EVP_MD_CTX ctx;
 677
 678         EVP_MD_CTX_init(&ctx);
 679         EVP_MD_CTX_copy_ex(&ctx,in_ctx);
 680         EVP_DigestFinal_ex(&ctx,out,&ret);
 681         EVP_MD_CTX_cleanup(&ctx);
 682         return((int)ret);
 683         }
 684
 685 int tls1_final_finish_mac(SSL *s, EVP_MD_CTX *in1_ctx, EVP_MD_CTX *in2_ctx,
 686              const char *str, int slen, unsigned char *out)
 687         {
 688         unsigned int i;
 689         EVP_MD_CTX ctx;
 690         unsigned char buf[TLS_MD_MAX_CONST_SIZE+MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 691         unsigned char *q,buf2[12];
 692
 693         q=buf;
 694         memcpy(q,str,slen);
 695         q+=slen;
 696
 697         EVP_MD_CTX_init(&ctx);
 698         EVP_MD_CTX_copy_ex(&ctx,in1_ctx);
 699         EVP_DigestFinal_ex(&ctx,q,&i);
 700         q+=i;
 701         EVP_MD_CTX_copy_ex(&ctx,in2_ctx);
 702         EVP_DigestFinal_ex(&ctx,q,&i);
 703         q+=i;
 704
 705         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(q-buf),
 706                 s->session->master_key,s->session->master_key_length,
 707                 out,buf2,sizeof buf2);
 708         EVP_MD_CTX_cleanup(&ctx);
 709
 710         return sizeof buf2;
 711         }
 712
 713 int tls1_mac(SSL *ssl, unsigned char *md, int send)
 714         {
 715         SSL3_RECORD *rec;
 716         unsigned char *mac_sec,*seq;
 717         const EVP_MD *hash;
 718         unsigned int md_size;
 719         int i;
 720         HMAC_CTX hmac;
 721         unsigned char buf[5];
 722
 723         if (send)
 724                 {
 725                 rec= &(ssl->s3->wrec);
 726                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 727                 seq= &(ssl->s3->write_sequence[0]);
 728                 hash=ssl->write_hash;
 729                 }
 730         else
 731                 {
 732                 rec= &(ssl->s3->rrec);
 733                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 734                 seq= &(ssl->s3->read_sequence[0]);
 735                 hash=ssl->read_hash;
 736                 }
 737
 738         md_size=EVP_MD_size(hash);
 739
 740         buf[0]=rec->type;
 741         buf[1]=TLS1_VERSION_MAJOR;
 742         buf[2]=TLS1_VERSION_MINOR;
 743         buf[3]=rec->length>>8;
 744         buf[4]=rec->length&0xff;
 745
 746         /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */
 747         HMAC_CTX_init(&hmac);
 748         HMAC_Init_ex(&hmac,mac_sec,EVP_MD_size(hash),hash,NULL);
 749         HMAC_Update(&hmac,seq,8);
 750         HMAC_Update(&hmac,buf,5);
 751         HMAC_Update(&hmac,rec->input,rec->length);
 752         HMAC_Final(&hmac,md,&md_size);
 753         HMAC_CTX_cleanup(&hmac);
 754
 755 #ifdef TLS_DEBUG
 756 printf("sec=");
 757 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); }
 758 printf("seq=");
 759 {int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); }
 760 printf("buf=");
 761 {int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); }
 762 printf("rec=");
 763 {unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); }
 764 #endif
 765
 766     if ( SSL_version(ssl) != DTLS1_VERSION)
 767             {
 768                 for (i=7; i>=0; i--)
 769                         {
 770                         ++seq[i];
 771                         if (seq[i] != 0) break;
 772                         }
 773                 }
 774
 775 #ifdef TLS_DEBUG
 776 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); }
 777 #endif
 778         return(md_size);
 779         }
 780
 781 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 782              int len)
 783         {
 784         unsigned char buf[SSL3_RANDOM_SIZE*2+TLS_MD_MASTER_SECRET_CONST_SIZE];
 785         unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH];
 786
 787 #ifdef KSSL_DEBUG
 788         printf ("tls1_generate_master_secret(%p,%p, %p, %d)\n", s,out, p,len);
 789 #endif  /* KSSL_DEBUG */
 790
 791         /* Setup the stuff to munge */
 792         memcpy(buf,TLS_MD_MASTER_SECRET_CONST,
 793                 TLS_MD_MASTER_SECRET_CONST_SIZE);
 794         memcpy(&(buf[TLS_MD_MASTER_SECRET_CONST_SIZE]),
 795                 s->s3->client_random,SSL3_RANDOM_SIZE);
 796         memcpy(&(buf[SSL3_RANDOM_SIZE+TLS_MD_MASTER_SECRET_CONST_SIZE]),
 797                 s->s3->server_random,SSL3_RANDOM_SIZE);
 798         tls1_PRF(s->ctx->md5,s->ctx->sha1,
 799                 buf,TLS_MD_MASTER_SECRET_CONST_SIZE+SSL3_RANDOM_SIZE*2,p,len,
 800                 s->session->master_key,buff,sizeof buff);
 801 #ifdef KSSL_DEBUG
 802         printf ("tls1_generate_master_secret() complete\n");
 803 #endif  /* KSSL_DEBUG */
 804         return(SSL3_MASTER_SECRET_SIZE);
 805         }
 806
 807 int tls1_alert_code(int code)
 808         {
 809         switch (code)
 810                 {
 811         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 812         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 813         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 814         case SSL_AD_DECRYPTION_FAILED:  return(TLS1_AD_DECRYPTION_FAILED);
 815         case SSL_AD_RECORD_OVERFLOW:    return(TLS1_AD_RECORD_OVERFLOW);
 816         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 817         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 818         case SSL_AD_NO_CERTIFICATE:     return(-1);
 819         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 820         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 821         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 822         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 823         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 824         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 825         case SSL_AD_UNKNOWN_CA:         return(TLS1_AD_UNKNOWN_CA);
 826         case SSL_AD_ACCESS_DENIED:      return(TLS1_AD_ACCESS_DENIED);
 827         case SSL_AD_DECODE_ERROR:       return(TLS1_AD_DECODE_ERROR);
 828         case SSL_AD_DECRYPT_ERROR:      return(TLS1_AD_DECRYPT_ERROR);
 829         case SSL_AD_EXPORT_RESTRICTION: return(TLS1_AD_EXPORT_RESTRICTION);
 830         case SSL_AD_PROTOCOL_VERSION:   return(TLS1_AD_PROTOCOL_VERSION);
 831         case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY);
 832         case SSL_AD_INTERNAL_ERROR:     return(TLS1_AD_INTERNAL_ERROR);
 833         case SSL_AD_USER_CANCELLED:     return(TLS1_AD_USER_CANCELLED);
 834         case SSL_AD_NO_RENEGOTIATION:   return(TLS1_AD_NO_RENEGOTIATION);
 835         case DTLS1_AD_MISSING_HANDSHAKE_MESSAGE: return
 836                                           (DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
 837         default:                        return(-1);
 838                 }
 839         }
 840