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) 1998-2007 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  * Copyright 2005 Nokia. All rights reserved.
 113  *
 114  * The portions of the attached software ("Contribution") is developed by
 115  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 116  * license.
 117  *
 118  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 119  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 120  * support (see RFC 4279) to OpenSSL.
 121  *
 122  * No patent licenses or other rights except those expressly stated in
 123  * the OpenSSL open source license shall be deemed granted or received
 124  * expressly, by implication, estoppel, or otherwise.
 125  *
 126  * No assurances are provided by Nokia that the Contribution does not
 127  * infringe the patent or other intellectual property rights of any third
 128  * party or that the license provides you with all the necessary rights
 129  * to make use of the Contribution.
 130  *
 131  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 132  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 133  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 134  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 135  * OTHERWISE.
 136  */
 137
 138 #include <stdio.h>
 139 #include "ssl_locl.h"
 140 #include <openssl/comp.h>
 141 #include <openssl/evp.h>
 142 #include <openssl/hmac.h>
 143 #include <openssl/md5.h>
 144
 145 static void tls1_P_hash(const EVP_MD *md, const unsigned char *sec,
 146                         int sec_len, unsigned char *seed, int seed_len,
 147                         unsigned char *out, int olen)
 148         {
 149         int chunk,n;
 150         unsigned int j;
 151         HMAC_CTX ctx;
 152         HMAC_CTX ctx_tmp;
 153         unsigned char A1[EVP_MAX_MD_SIZE];
 154         unsigned int A1_len;
 155
 156         chunk=EVP_MD_size(md);
 157
 158         HMAC_CTX_init(&ctx);
 159         HMAC_CTX_init(&ctx_tmp);
 160         HMAC_Init_ex(&ctx,sec,sec_len,md, NULL);
 161         HMAC_Init_ex(&ctx_tmp,sec,sec_len,md, NULL);
 162         HMAC_Update(&ctx,seed,seed_len);
 163         HMAC_Final(&ctx,A1,&A1_len);
 164
 165         n=0;
 166         for (;;)
 167                 {
 168                 HMAC_Init_ex(&ctx,NULL,0,NULL,NULL); /* re-init */
 169                 HMAC_Init_ex(&ctx_tmp,NULL,0,NULL,NULL); /* re-init */
 170                 HMAC_Update(&ctx,A1,A1_len);
 171                 HMAC_Update(&ctx_tmp,A1,A1_len);
 172                 HMAC_Update(&ctx,seed,seed_len);
 173
 174                 if (olen > chunk)
 175                         {
 176                         HMAC_Final(&ctx,out,&j);
 177                         out+=j;
 178                         olen-=j;
 179                         HMAC_Final(&ctx_tmp,A1,&A1_len); /* calc the next A1 value */
 180                         }
 181                 else    /* last one */
 182                         {
 183                         HMAC_Final(&ctx,A1,&A1_len);
 184                         memcpy(out,A1,olen);
 185                         break;
 186                         }
 187                 }
 188         HMAC_CTX_cleanup(&ctx);
 189         HMAC_CTX_cleanup(&ctx_tmp);
 190         OPENSSL_cleanse(A1,sizeof(A1));
 191         }
 192
 193 static void tls1_PRF(long digest_mask,
 194                      unsigned char *label, int label_len,
 195                      const unsigned char *sec, int slen, unsigned char *out1,
 196                      unsigned char *out2, int olen)
 197         {
 198         int len,i,idx,count;
 199         const unsigned char *S1;
 200         long m;
 201         const EVP_MD *md;
 202
 203         /* Count number of digests and divide sec evenly */
 204         count=0;
 205         for (idx=0;ssl_get_handshake_digest(idx,&m,&md);idx++) {
 206                 if ((m<<TLS1_PRF_DGST_SHIFT) & digest_mask) count++;
 207         }
 208         len=slen/count;
 209         S1=sec;
 210         memset(out1,0,olen);
 211         for (idx=0;ssl_get_handshake_digest(idx,&m,&md);idx++) {
 212                 if ((m<<TLS1_PRF_DGST_SHIFT) & digest_mask) {
 213                         if (!md) {
 214                                 SSLerr(SSL_F_TLS1_PRF,
 215                                 SSL_R_UNSUPPORTED_DIGEST_TYPE);
 216                                 return;
 217                         }
 218                         tls1_P_hash(md ,S1,len+(slen&1),label,label_len,out2,olen);
 219                         S1+=len;
 220                         for (i=0; i<olen; i++)
 221                         {
 222                                 out1[i]^=out2[i];
 223                         }
 224                 }
 225         }
 226
 227 }
 228 static void tls1_generate_key_block(SSL *s, unsigned char *km,
 229              unsigned char *tmp, int num)
 230         {
 231         unsigned char *p;
 232         unsigned char buf[SSL3_RANDOM_SIZE*2+
 233                 TLS_MD_MAX_CONST_SIZE];
 234         p=buf;
 235
 236         memcpy(p,TLS_MD_KEY_EXPANSION_CONST,
 237                 TLS_MD_KEY_EXPANSION_CONST_SIZE);
 238         p+=TLS_MD_KEY_EXPANSION_CONST_SIZE;
 239         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 240         p+=SSL3_RANDOM_SIZE;
 241         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 242         p+=SSL3_RANDOM_SIZE;
 243
 244         tls1_PRF(s->s3->tmp.new_cipher->algorithm2,buf,(int)(p-buf),
 245                  s->session->master_key,s->session->master_key_length,
 246                  km,tmp,num);
 247 #ifdef KSSL_DEBUG
 248         printf("tls1_generate_key_block() ==> %d byte master_key =\n\t",
 249                 s->session->master_key_length);
 250         {
 251         int i;
 252         for (i=0; i < s->session->master_key_length; i++)
 253                 {
 254                 printf("%02X", s->session->master_key[i]);
 255                 }
 256         printf("\n");  }
 257 #endif    /* KSSL_DEBUG */
 258         }
 259
 260 int tls1_change_cipher_state(SSL *s, int which)
 261         {
 262         static const unsigned char empty[]="";
 263         unsigned char *p,*key_block,*mac_secret;
 264         unsigned char *exp_label,buf[TLS_MD_MAX_CONST_SIZE+
 265                 SSL3_RANDOM_SIZE*2];
 266         unsigned char tmp1[EVP_MAX_KEY_LENGTH];
 267         unsigned char tmp2[EVP_MAX_KEY_LENGTH];
 268         unsigned char iv1[EVP_MAX_IV_LENGTH*2];
 269         unsigned char iv2[EVP_MAX_IV_LENGTH*2];
 270         unsigned char *ms,*key,*iv,*er1,*er2;
 271         int client_write;
 272         EVP_CIPHER_CTX *dd;
 273         const EVP_CIPHER *c;
 274 #ifndef OPENSSL_NO_COMP
 275         const SSL_COMP *comp;
 276 #endif
 277         const EVP_MD *m;
 278         int mac_type;
 279         int *mac_secret_size;
 280         EVP_MD_CTX *mac_ctx;
 281         EVP_PKEY *mac_key;
 282         int is_export,n,i,j,k,exp_label_len,cl;
 283         int reuse_dd = 0;
 284
 285         is_export=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
 286         c=s->s3->tmp.new_sym_enc;
 287         m=s->s3->tmp.new_hash;
 288         mac_type = s->s3->tmp.new_mac_pkey_type;
 289 #ifndef OPENSSL_NO_COMP
 290         comp=s->s3->tmp.new_compression;
 291 #endif
 292         key_block=s->s3->tmp.key_block;
 293
 294 #ifdef KSSL_DEBUG
 295         printf("tls1_change_cipher_state(which= %d) w/\n", which);
 296         printf("\talg= %ld/%ld, comp= %p\n",
 297                s->s3->tmp.new_cipher->algorithm_mkey,
 298                s->s3->tmp.new_cipher->algorithm_auth,
 299                comp);
 300         printf("\tevp_cipher == %p ==? &d_cbc_ede_cipher3\n", c);
 301         printf("\tevp_cipher: nid, blksz= %d, %d, keylen=%d, ivlen=%d\n",
 302                 c->nid,c->block_size,c->key_len,c->iv_len);
 303         printf("\tkey_block: len= %d, data= ", s->s3->tmp.key_block_length);
 304         {
 305         int i;
 306         for (i=0; i<s->s3->tmp.key_block_length; i++)
 307                 printf("%02x", key_block[i]);  printf("\n");
 308         }
 309 #endif  /* KSSL_DEBUG */
 310
 311         if (which & SSL3_CC_READ)
 312                 {
 313                 if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
 314                         s->mac_flags |= SSL_MAC_FLAG_READ_MAC_STREAM;
 315                         else
 316                         s->mac_flags &= ~SSL_MAC_FLAG_READ_MAC_STREAM;
 317
 318                 if (s->enc_read_ctx != NULL)
 319                         reuse_dd = 1;
 320                 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 321                         goto err;
 322                 else
 323                         /* make sure it's intialized in case we exit later with an error */
 324                         EVP_CIPHER_CTX_init(s->enc_read_ctx);
 325                 dd= s->enc_read_ctx;
 326                 mac_ctx=ssl_replace_hash(&s->read_hash,NULL);
 327 #ifndef OPENSSL_NO_COMP
 328                 if (s->expand != NULL)
 329                         {
 330                         COMP_CTX_free(s->expand);
 331                         s->expand=NULL;
 332                         }
 333                 if (comp != NULL)
 334                         {
 335                         s->expand=COMP_CTX_new(comp->method);
 336                         if (s->expand == NULL)
 337                                 {
 338                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 339                                 goto err2;
 340                                 }
 341                         if (s->s3->rrec.comp == NULL)
 342                                 s->s3->rrec.comp=(unsigned char *)
 343                                         OPENSSL_malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH);
 344                         if (s->s3->rrec.comp == NULL)
 345                                 goto err;
 346                         }
 347 #endif
 348                 /* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
 349                 if (s->version != DTLS1_VERSION)
 350                         memset(&(s->s3->read_sequence[0]),0,8);
 351                 mac_secret= &(s->s3->read_mac_secret[0]);
 352                 mac_secret_size=&(s->s3->read_mac_secret_size);
 353                 }
 354         else
 355                 {
 356                 if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
 357                         s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_STREAM;
 358                         else
 359                         s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_STREAM;
 360                 if (s->enc_write_ctx != NULL)
 361                         reuse_dd = 1;
 362                 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 363                         goto err;
 364                 else
 365                         /* make sure it's intialized in case we exit later with an error */
 366                         EVP_CIPHER_CTX_init(s->enc_write_ctx);
 367                 dd= s->enc_write_ctx;
 368                 mac_ctx = ssl_replace_hash(&s->write_hash,NULL);
 369 #ifndef OPENSSL_NO_COMP
 370                 if (s->compress != NULL)
 371                         {
 372                         COMP_CTX_free(s->compress);
 373                         s->compress=NULL;
 374                         }
 375                 if (comp != NULL)
 376                         {
 377                         s->compress=COMP_CTX_new(comp->method);
 378                         if (s->compress == NULL)
 379                                 {
 380                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 381                                 goto err2;
 382                                 }
 383                         }
 384 #endif
 385                 /* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
 386                 if (s->version != DTLS1_VERSION)
 387                         memset(&(s->s3->write_sequence[0]),0,8);
 388                 mac_secret= &(s->s3->write_mac_secret[0]);
 389                 mac_secret_size = &(s->s3->write_mac_secret_size);
 390                 }
 391
 392         if (reuse_dd)
 393                 EVP_CIPHER_CTX_cleanup(dd);
 394
 395         p=s->s3->tmp.key_block;
 396         i=*mac_secret_size=s->s3->tmp.new_mac_secret_size;
 397
 398         cl=EVP_CIPHER_key_length(c);
 399         j=is_export ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
 400                        cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
 401         /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 402         k=EVP_CIPHER_iv_length(c);
 403         er1= &(s->s3->client_random[0]);
 404         er2= &(s->s3->server_random[0]);
 405         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 406                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 407                 {
 408                 ms=  &(p[ 0]); n=i+i;
 409                 key= &(p[ n]); n+=j+j;
 410                 iv=  &(p[ n]); n+=k+k;
 411                 exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST;
 412                 exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE;
 413                 client_write=1;
 414                 }
 415         else
 416                 {
 417                 n=i;
 418                 ms=  &(p[ n]); n+=i+j;
 419                 key= &(p[ n]); n+=j+k;
 420                 iv=  &(p[ n]); n+=k;
 421                 exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST;
 422                 exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE;
 423                 client_write=0;
 424                 }
 425
 426         if (n > s->s3->tmp.key_block_length)
 427                 {
 428                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
 429                 goto err2;
 430                 }
 431
 432         memcpy(mac_secret,ms,i);
 433         mac_key = EVP_PKEY_new_mac_key(mac_type, NULL,
 434                         mac_secret,*mac_secret_size);
 435         EVP_DigestSignInit(mac_ctx,NULL,m,NULL,mac_key);
 436         EVP_PKEY_free(mac_key);
 437 #ifdef TLS_DEBUG
 438 printf("which = %04X\nmac key=",which);
 439 { int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); }
 440 #endif
 441         if (is_export)
 442                 {
 443                 /* In here I set both the read and write key/iv to the
 444                  * same value since only the correct one will be used :-).
 445                  */
 446                 p=buf;
 447                 memcpy(p,exp_label,exp_label_len);
 448                 p+=exp_label_len;
 449                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 450                 p+=SSL3_RANDOM_SIZE;
 451                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 452                 p+=SSL3_RANDOM_SIZE;
 453                 tls1_PRF(s->s3->tmp.new_cipher->algorithm2,buf,(int)(p-buf),key,j,
 454                          tmp1,tmp2,EVP_CIPHER_key_length(c));
 455                 key=tmp1;
 456
 457                 if (k > 0)
 458                         {
 459                         p=buf;
 460                         memcpy(p,TLS_MD_IV_BLOCK_CONST,
 461                                 TLS_MD_IV_BLOCK_CONST_SIZE);
 462                         p+=TLS_MD_IV_BLOCK_CONST_SIZE;
 463                         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 464                         p+=SSL3_RANDOM_SIZE;
 465                         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 466                         p+=SSL3_RANDOM_SIZE;
 467                         tls1_PRF(s->s3->tmp.new_cipher->algorithm2,buf,p-buf,empty,0,
 468                                  iv1,iv2,k*2);
 469                         if (client_write)
 470                                 iv=iv1;
 471                         else
 472                                 iv= &(iv1[k]);
 473                         }
 474                 }
 475
 476         s->session->key_arg_length=0;
 477 #ifdef KSSL_DEBUG
 478         {
 479         int i;
 480         printf("EVP_CipherInit_ex(dd,c,key=,iv=,which)\n");
 481         printf("\tkey= "); for (i=0; i<c->key_len; i++) printf("%02x", key[i]);
 482         printf("\n");
 483         printf("\t iv= "); for (i=0; i<c->iv_len; i++) printf("%02x", iv[i]);
 484         printf("\n");
 485         }
 486 #endif  /* KSSL_DEBUG */
 487
 488         EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
 489 #ifdef TLS_DEBUG
 490 printf("which = %04X\nkey=",which);
 491 { int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); }
 492 printf("\niv=");
 493 { int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); }
 494 printf("\n");
 495 #endif
 496
 497         OPENSSL_cleanse(tmp1,sizeof(tmp1));
 498         OPENSSL_cleanse(tmp2,sizeof(tmp1));
 499         OPENSSL_cleanse(iv1,sizeof(iv1));
 500         OPENSSL_cleanse(iv2,sizeof(iv2));
 501         return(1);
 502 err:
 503         SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 504 err2:
 505         return(0);
 506         }
 507
 508 int tls1_setup_key_block(SSL *s)
 509         {
 510         unsigned char *p1,*p2;
 511         const EVP_CIPHER *c;
 512         const EVP_MD *hash;
 513         int num;
 514         SSL_COMP *comp;
 515         int mac_type= NID_undef,mac_secret_size=0;
 516
 517 #ifdef KSSL_DEBUG
 518         printf ("tls1_setup_key_block()\n");
 519 #endif  /* KSSL_DEBUG */
 520
 521         if (s->s3->tmp.key_block_length != 0)
 522                 return(1);
 523
 524         if (!ssl_cipher_get_evp(s->session,&c,&hash,&mac_type,&mac_secret_size,&comp))
 525                 {
 526                 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 527                 return(0);
 528                 }
 529
 530         s->s3->tmp.new_sym_enc=c;
 531         s->s3->tmp.new_hash=hash;
 532         s->s3->tmp.new_mac_pkey_type = mac_type;
 533         s->s3->tmp.new_mac_secret_size = mac_secret_size;
 534         num=EVP_CIPHER_key_length(c)+mac_secret_size+EVP_CIPHER_iv_length(c);
 535         num*=2;
 536
 537         ssl3_cleanup_key_block(s);
 538
 539         if ((p1=(unsigned char *)OPENSSL_malloc(num)) == NULL)
 540                 goto err;
 541         if ((p2=(unsigned char *)OPENSSL_malloc(num)) == NULL)
 542                 goto err;
 543
 544         s->s3->tmp.key_block_length=num;
 545         s->s3->tmp.key_block=p1;
 546
 547
 548 #ifdef TLS_DEBUG
 549 printf("client random\n");
 550 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); }
 551 printf("server random\n");
 552 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); }
 553 printf("pre-master\n");
 554 { int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); }
 555 #endif
 556         tls1_generate_key_block(s,p1,p2,num);
 557         OPENSSL_cleanse(p2,num);
 558         OPENSSL_free(p2);
 559 #ifdef TLS_DEBUG
 560 printf("\nkey block\n");
 561 { int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); }
 562 #endif
 563
 564         if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
 565                 {
 566                 /* enable vulnerability countermeasure for CBC ciphers with
 567                  * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
 568                  */
 569                 s->s3->need_empty_fragments = 1;
 570
 571                 if (s->session->cipher != NULL)
 572                         {
 573                         if (s->session->cipher->algorithm_enc == SSL_eNULL)
 574                                 s->s3->need_empty_fragments = 0;
 575
 576 #ifndef OPENSSL_NO_RC4
 577                         if (s->session->cipher->algorithm_enc == SSL_RC4)
 578                                 s->s3->need_empty_fragments = 0;
 579 #endif
 580                         }
 581                 }
 582
 583         return(1);
 584 err:
 585         SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 586         return(0);
 587         }
 588
 589 int tls1_enc(SSL *s, int send)
 590         {
 591         SSL3_RECORD *rec;
 592         EVP_CIPHER_CTX *ds;
 593         unsigned long l;
 594         int bs,i,ii,j,k,n=0;
 595         const EVP_CIPHER *enc;
 596
 597         if (send)
 598                 {
 599                 if (EVP_MD_CTX_md(s->write_hash))
 600                         n=EVP_MD_CTX_size(s->write_hash);
 601                 ds=s->enc_write_ctx;
 602                 rec= &(s->s3->wrec);
 603                 if (s->enc_write_ctx == NULL)
 604                         enc=NULL;
 605                 else
 606                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 607                 }
 608         else
 609                 {
 610                 if (EVP_MD_CTX_md(s->read_hash))
 611                         n=EVP_MD_CTX_size(s->read_hash);
 612                 ds=s->enc_read_ctx;
 613                 rec= &(s->s3->rrec);
 614                 if (s->enc_read_ctx == NULL)
 615                         enc=NULL;
 616                 else
 617                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 618                 }
 619
 620 #ifdef KSSL_DEBUG
 621         printf("tls1_enc(%d)\n", send);
 622 #endif    /* KSSL_DEBUG */
 623
 624         if ((s->session == NULL) || (ds == NULL) ||
 625                 (enc == NULL))
 626                 {
 627                 memmove(rec->data,rec->input,rec->length);
 628                 rec->input=rec->data;
 629                 }
 630         else
 631                 {
 632                 l=rec->length;
 633                 bs=EVP_CIPHER_block_size(ds->cipher);
 634
 635                 if ((bs != 1) && send)
 636                         {
 637                         i=bs-((int)l%bs);
 638
 639                         /* Add weird padding of upto 256 bytes */
 640
 641                         /* we need to add 'i' padding bytes of value j */
 642                         j=i-1;
 643                         if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG)
 644                                 {
 645                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 646                                         j++;
 647                                 }
 648                         for (k=(int)l; k<(int)(l+i); k++)
 649                                 rec->input[k]=j;
 650                         l+=i;
 651                         rec->length+=i;
 652                         }
 653
 654 #ifdef KSSL_DEBUG
 655                 {
 656                 unsigned long ui;
 657                 printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n",
 658                         ds,rec->data,rec->input,l);
 659                 printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n",
 660                         ds->buf_len, ds->cipher->key_len,
 661                         DES_KEY_SZ, DES_SCHEDULE_SZ,
 662                         ds->cipher->iv_len);
 663                 printf("\t\tIV: ");
 664                 for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]);
 665                 printf("\n");
 666                 printf("\trec->input=");
 667                 for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]);
 668                 printf("\n");
 669                 }
 670 #endif  /* KSSL_DEBUG */
 671
 672                 if (!send)
 673                         {
 674                         if (l == 0 || l%bs != 0)
 675                                 {
 676                                 SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 677                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
 678                                 return 0;
 679                                 }
 680                         }
 681
 682                 EVP_Cipher(ds,rec->data,rec->input,l);
 683
 684 #ifdef KSSL_DEBUG
 685                 {
 686                 unsigned long i;
 687                 printf("\trec->data=");
 688                 for (i=0; i<l; i++)
 689                         printf(" %02x", rec->data[i]);  printf("\n");
 690                 }
 691 #endif  /* KSSL_DEBUG */
 692
 693                 if ((bs != 1) && !send)
 694                         {
 695                         ii=i=rec->data[l-1]; /* padding_length */
 696                         i++;
 697                         /* NB: if compression is in operation the first packet
 698                          * may not be of even length so the padding bug check
 699                          * cannot be performed. This bug workaround has been
 700                          * around since SSLeay so hopefully it is either fixed
 701                          * now or no buggy implementation supports compression
 702                          * [steve]
 703                          */
 704                         if ( (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG)
 705                                 && !s->expand)
 706                                 {
 707                                 /* First packet is even in size, so check */
 708                                 if ((memcmp(s->s3->read_sequence,
 709                                         "\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1))
 710                                         s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG;
 711                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 712                                         i--;
 713                                 }
 714                         /* TLS 1.0 does not bound the number of padding bytes by the block size.
 715                          * All of them must have value 'padding_length'. */
 716                         if (i > (int)rec->length)
 717                                 {
 718                                 /* Incorrect padding. SSLerr() and ssl3_alert are done
 719                                  * by caller: we don't want to reveal whether this is
 720                                  * a decryption error or a MAC verification failure
 721                                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
 722                                 return -1;
 723                                 }
 724                         for (j=(int)(l-i); j<(int)l; j++)
 725                                 {
 726                                 if (rec->data[j] != ii)
 727                                         {
 728                                         /* Incorrect padding */
 729                                         return -1;
 730                                         }
 731                                 }
 732                         rec->length-=i;
 733                         }
 734                 }
 735         return(1);
 736         }
 737 int tls1_cert_verify_mac(SSL *s, int md_nid, unsigned char *out)
 738         {
 739         unsigned int ret;
 740         EVP_MD_CTX ctx, *d=NULL;
 741         int i;
 742
 743         if (s->s3->handshake_buffer)
 744                 ssl3_digest_cached_records(s);
 745         for (i=0;i<SSL_MAX_DIGEST;i++)
 746                 {
 747                   if (s->s3->handshake_dgst[i]&&EVP_MD_CTX_type(s->s3->handshake_dgst[i])==md_nid)
 748                         {
 749                         d=s->s3->handshake_dgst[i];
 750                         break;
 751                         }
 752                 }
 753         if (!d) {
 754                 SSLerr(SSL_F_TLS1_CERT_VERIFY_MAC,SSL_R_NO_REQUIRED_DIGEST);
 755                 return 0;
 756         }
 757
 758         EVP_MD_CTX_init(&ctx);
 759         EVP_MD_CTX_copy_ex(&ctx,d);
 760         EVP_DigestFinal_ex(&ctx,out,&ret);
 761         EVP_MD_CTX_cleanup(&ctx);
 762         return((int)ret);
 763         }
 764
 765 int tls1_final_finish_mac(SSL *s,
 766              const char *str, int slen, unsigned char *out)
 767         {
 768         unsigned int i;
 769         EVP_MD_CTX ctx;
 770         unsigned char buf[TLS_MD_MAX_CONST_SIZE+MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 771         unsigned char *q,buf2[12];
 772         int idx;
 773         long mask;
 774         const EVP_MD *md;
 775
 776         q=buf;
 777         memcpy(q,str,slen);
 778         q+=slen;
 779
 780         EVP_MD_CTX_init(&ctx);
 781
 782         if (s->s3->handshake_buffer)
 783                 ssl3_digest_cached_records(s);
 784
 785         for (idx=0;ssl_get_handshake_digest(idx,&mask,&md);idx++) {
 786                 if (mask & s->s3->tmp.new_cipher->algorithm2) {
 787                         EVP_MD_CTX_copy_ex(&ctx,s->s3->handshake_dgst[idx]);
 788                         EVP_DigestFinal_ex(&ctx,q,&i);
 789                         q+=i;
 790                 }
 791         }
 792
 793         tls1_PRF(s->s3->tmp.new_cipher->algorithm2,buf,(int)(q-buf),
 794                 s->session->master_key,s->session->master_key_length,
 795                 out,buf2,sizeof buf2);
 796         EVP_MD_CTX_cleanup(&ctx);
 797
 798         return sizeof buf2;
 799         }
 800
 801 int tls1_mac(SSL *ssl, unsigned char *md, int send)
 802         {
 803         SSL3_RECORD *rec;
 804         unsigned char *mac_sec,*seq;
 805         EVP_MD_CTX *hash;
 806         size_t md_size;
 807         int i;
 808         EVP_MD_CTX hmac, *mac_ctx;
 809         unsigned char buf[5];
 810         int stream_mac = (send?(ssl->mac_flags & SSL_MAC_FLAG_WRITE_MAC_STREAM):(ssl->mac_flags&SSL_MAC_FLAG_READ_MAC_STREAM));
 811         if (send)
 812                 {
 813                 rec= &(ssl->s3->wrec);
 814                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 815                 seq= &(ssl->s3->write_sequence[0]);
 816                 hash=ssl->write_hash;
 817                 }
 818         else
 819                 {
 820                 rec= &(ssl->s3->rrec);
 821                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 822                 seq= &(ssl->s3->read_sequence[0]);
 823                 hash=ssl->read_hash;
 824                 }
 825
 826         md_size=EVP_MD_CTX_size(hash);
 827
 828         buf[0]=rec->type;
 829         buf[1]=TLS1_VERSION_MAJOR;
 830         buf[2]=TLS1_VERSION_MINOR;
 831         buf[3]=rec->length>>8;
 832         buf[4]=rec->length&0xff;
 833
 834         /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */
 835         if (stream_mac)
 836                 {
 837                         mac_ctx = hash;
 838                 }
 839                 else
 840                 {
 841                         EVP_MD_CTX_copy(&hmac,hash);
 842                         mac_ctx = &hmac;
 843                 }
 844         EVP_DigestSignUpdate(mac_ctx,seq,8);
 845         EVP_DigestSignUpdate(mac_ctx,buf,5);
 846         EVP_DigestSignUpdate(mac_ctx,rec->input,rec->length);
 847         if (stream_mac) EVP_MD_CTX_copy(&hmac,hash);
 848         EVP_DigestSignFinal(&hmac,md,&md_size);
 849         EVP_MD_CTX_cleanup(&hmac);
 850 #ifdef TLS_DEBUG
 851 printf("sec=");
 852 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); }
 853 printf("seq=");
 854 {int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); }
 855 printf("buf=");
 856 {int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); }
 857 printf("rec=");
 858 {unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); }
 859 #endif
 860
 861     if ( SSL_version(ssl) != DTLS1_VERSION)
 862             {
 863                 for (i=7; i>=0; i--)
 864                         {
 865                         ++seq[i];
 866                         if (seq[i] != 0) break;
 867                         }
 868                 }
 869
 870 #ifdef TLS_DEBUG
 871 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); }
 872 #endif
 873         return(md_size);
 874         }
 875
 876 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 877              int len)
 878         {
 879         unsigned char buf[SSL3_RANDOM_SIZE*2+TLS_MD_MASTER_SECRET_CONST_SIZE];
 880         unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH];
 881
 882 #ifdef KSSL_DEBUG
 883         printf ("tls1_generate_master_secret(%p,%p, %p, %d)\n", s,out, p,len);
 884 #endif  /* KSSL_DEBUG */
 885
 886         /* Setup the stuff to munge */
 887         memcpy(buf,TLS_MD_MASTER_SECRET_CONST,
 888                 TLS_MD_MASTER_SECRET_CONST_SIZE);
 889         memcpy(&(buf[TLS_MD_MASTER_SECRET_CONST_SIZE]),
 890                 s->s3->client_random,SSL3_RANDOM_SIZE);
 891         memcpy(&(buf[SSL3_RANDOM_SIZE+TLS_MD_MASTER_SECRET_CONST_SIZE]),
 892                 s->s3->server_random,SSL3_RANDOM_SIZE);
 893         tls1_PRF(s->s3->tmp.new_cipher->algorithm2,
 894                 buf,TLS_MD_MASTER_SECRET_CONST_SIZE+SSL3_RANDOM_SIZE*2,p,len,
 895                 s->session->master_key,buff,sizeof buff);
 896 #ifdef KSSL_DEBUG
 897         printf ("tls1_generate_master_secret() complete\n");
 898 #endif  /* KSSL_DEBUG */
 899         return(SSL3_MASTER_SECRET_SIZE);
 900         }
 901
 902 int tls1_alert_code(int code)
 903         {
 904         switch (code)
 905                 {
 906         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 907         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 908         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 909         case SSL_AD_DECRYPTION_FAILED:  return(TLS1_AD_DECRYPTION_FAILED);
 910         case SSL_AD_RECORD_OVERFLOW:    return(TLS1_AD_RECORD_OVERFLOW);
 911         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 912         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 913         case SSL_AD_NO_CERTIFICATE:     return(-1);
 914         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 915         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 916         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 917         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 918         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 919         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 920         case SSL_AD_UNKNOWN_CA:         return(TLS1_AD_UNKNOWN_CA);
 921         case SSL_AD_ACCESS_DENIED:      return(TLS1_AD_ACCESS_DENIED);
 922         case SSL_AD_DECODE_ERROR:       return(TLS1_AD_DECODE_ERROR);
 923         case SSL_AD_DECRYPT_ERROR:      return(TLS1_AD_DECRYPT_ERROR);
 924         case SSL_AD_EXPORT_RESTRICTION: return(TLS1_AD_EXPORT_RESTRICTION);
 925         case SSL_AD_PROTOCOL_VERSION:   return(TLS1_AD_PROTOCOL_VERSION);
 926         case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY);
 927         case SSL_AD_INTERNAL_ERROR:     return(TLS1_AD_INTERNAL_ERROR);
 928         case SSL_AD_USER_CANCELLED:     return(TLS1_AD_USER_CANCELLED);
 929         case SSL_AD_NO_RENEGOTIATION:   return(TLS1_AD_NO_RENEGOTIATION);
 930         case SSL_AD_UNSUPPORTED_EXTENSION: return(TLS1_AD_UNSUPPORTED_EXTENSION);
 931         case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(TLS1_AD_CERTIFICATE_UNOBTAINABLE);
 932         case SSL_AD_UNRECOGNIZED_NAME:  return(TLS1_AD_UNRECOGNIZED_NAME);
 933         case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE);
 934         case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(TLS1_AD_BAD_CERTIFICATE_HASH_VALUE);
 935         case SSL_AD_UNKNOWN_PSK_IDENTITY:return(TLS1_AD_UNKNOWN_PSK_IDENTITY);
 936 #if 0 /* not appropriate for TLS, not used for DTLS */
 937         case DTLS1_AD_MISSING_HANDSHAKE_MESSAGE: return
 938                                           (DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
 939 #endif
 940         default:                        return(-1);
 941                 }
 942         }
 943