1 /* ssl/s3_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/evp.h> 115 #include <openssl/md5.h> 116 117 static unsigned char ssl3_pad_1[48]={ 118 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, 119 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, 120 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, 121 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, 122 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, 123 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36 }; 124 125 static unsigned char ssl3_pad_2[48]={ 126 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, 127 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, 128 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, 129 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, 130 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, 131 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c }; 132 133 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx, 134 const char *sender, int len, unsigned char *p); 135 136 static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num) 137 { 138 EVP_MD_CTX m5; 139 EVP_MD_CTX s1; 140 unsigned char buf[16],smd[SHA_DIGEST_LENGTH]; 141 unsigned char c='A'; 142 unsigned int i,j,k; 143 144 #ifdef CHARSET_EBCDIC 145 c = os_toascii[c]; /*'A' in ASCII */ 146 #endif 147 k=0; 148 EVP_MD_CTX_init(&m5); 149 EVP_MD_CTX_init(&s1); 150 for (i=0; (int)i<num; i+=MD5_DIGEST_LENGTH) 151 { 152 k++; 153 if (k > sizeof buf) 154 { 155 /* bug: 'buf' is too small for this ciphersuite */ 156 SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR); 157 return 0; 158 } 159 160 for (j=0; j<k; j++) 161 buf[j]=c; 162 c++; 163 EVP_DigestInit_ex(&s1,EVP_sha1(), NULL); 164 EVP_DigestUpdate(&s1,buf,k); 165 EVP_DigestUpdate(&s1,s->session->master_key, 166 s->session->master_key_length); 167 EVP_DigestUpdate(&s1,s->s3->server_random,SSL3_RANDOM_SIZE); 168 EVP_DigestUpdate(&s1,s->s3->client_random,SSL3_RANDOM_SIZE); 169 EVP_DigestFinal_ex(&s1,smd,NULL); 170 171 EVP_DigestInit_ex(&m5,EVP_md5(), NULL); 172 EVP_DigestUpdate(&m5,s->session->master_key, 173 s->session->master_key_length); 174 EVP_DigestUpdate(&m5,smd,SHA_DIGEST_LENGTH); 175 if ((int)(i+MD5_DIGEST_LENGTH) > num) 176 { 177 EVP_DigestFinal_ex(&m5,smd,NULL); 178 memcpy(km,smd,(num-i)); 179 } 180 else 181 EVP_DigestFinal_ex(&m5,km,NULL); 182 183 km+=MD5_DIGEST_LENGTH; 184 } 185 OPENSSL_cleanse(smd,SHA_DIGEST_LENGTH); 186 EVP_MD_CTX_cleanup(&m5); 187 EVP_MD_CTX_cleanup(&s1); 188 return 1; 189 } 190 191 int ssl3_change_cipher_state(SSL *s, int which) 192 { 193 unsigned char *p,*key_block,*mac_secret; 194 unsigned char exp_key[EVP_MAX_KEY_LENGTH]; 195 unsigned char exp_iv[EVP_MAX_IV_LENGTH]; 196 unsigned char *ms,*key,*iv,*er1,*er2; 197 EVP_CIPHER_CTX *dd; 198 const EVP_CIPHER *c; 199 #ifndef OPENSSL_NO_COMP 200 COMP_METHOD *comp; 201 #endif 202 const EVP_MD *m; 203 EVP_MD_CTX md; 204 int is_exp,n,i,j,k,cl; 205 int reuse_dd = 0; 206 207 is_exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher); 208 c=s->s3->tmp.new_sym_enc; 209 m=s->s3->tmp.new_hash; 210 #ifndef OPENSSL_NO_COMP 211 if (s->s3->tmp.new_compression == NULL) 212 comp=NULL; 213 else 214 comp=s->s3->tmp.new_compression->method; 215 #endif 216 key_block=s->s3->tmp.key_block; 217 218 if (which & SSL3_CC_READ) 219 { 220 if (s->enc_read_ctx != NULL) 221 reuse_dd = 1; 222 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) 223 goto err; 224 dd= s->enc_read_ctx; 225 s->read_hash=m; 226 #ifndef OPENSSL_NO_COMP 227 /* COMPRESS */ 228 if (s->expand != NULL) 229 { 230 COMP_CTX_free(s->expand); 231 s->expand=NULL; 232 } 233 if (comp != NULL) 234 { 235 s->expand=COMP_CTX_new(comp); 236 if (s->expand == NULL) 237 { 238 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); 239 goto err2; 240 } 241 if (s->s3->rrec.comp == NULL) 242 s->s3->rrec.comp=(unsigned char *) 243 OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH); 244 if (s->s3->rrec.comp == NULL) 245 goto err; 246 } 247 #endif 248 memset(&(s->s3->read_sequence[0]),0,8); 249 mac_secret= &(s->s3->read_mac_secret[0]); 250 } 251 else 252 { 253 if (s->enc_write_ctx != NULL) 254 reuse_dd = 1; 255 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) 256 goto err; 257 dd= s->enc_write_ctx; 258 s->write_hash=m; 259 #ifndef OPENSSL_NO_COMP 260 /* COMPRESS */ 261 if (s->compress != NULL) 262 { 263 COMP_CTX_free(s->compress); 264 s->compress=NULL; 265 } 266 if (comp != NULL) 267 { 268 s->compress=COMP_CTX_new(comp); 269 if (s->compress == NULL) 270 { 271 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); 272 goto err2; 273 } 274 } 275 #endif 276 memset(&(s->s3->write_sequence[0]),0,8); 277 mac_secret= &(s->s3->write_mac_secret[0]); 278 } 279 280 if (reuse_dd) 281 EVP_CIPHER_CTX_cleanup(dd); 282 EVP_CIPHER_CTX_init(dd); 283 284 p=s->s3->tmp.key_block; 285 i=EVP_MD_size(m); 286 cl=EVP_CIPHER_key_length(c); 287 j=is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ? 288 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl; 289 /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */ 290 k=EVP_CIPHER_iv_length(c); 291 if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) || 292 (which == SSL3_CHANGE_CIPHER_SERVER_READ)) 293 { 294 ms= &(p[ 0]); n=i+i; 295 key= &(p[ n]); n+=j+j; 296 iv= &(p[ n]); n+=k+k; 297 er1= &(s->s3->client_random[0]); 298 er2= &(s->s3->server_random[0]); 299 } 300 else 301 { 302 n=i; 303 ms= &(p[ n]); n+=i+j; 304 key= &(p[ n]); n+=j+k; 305 iv= &(p[ n]); n+=k; 306 er1= &(s->s3->server_random[0]); 307 er2= &(s->s3->client_random[0]); 308 } 309 310 if (n > s->s3->tmp.key_block_length) 311 { 312 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR); 313 goto err2; 314 } 315 316 EVP_MD_CTX_init(&md); 317 memcpy(mac_secret,ms,i); 318 if (is_exp) 319 { 320 /* In here I set both the read and write key/iv to the 321 * same value since only the correct one will be used :-). 322 */ 323 EVP_DigestInit_ex(&md,EVP_md5(), NULL); 324 EVP_DigestUpdate(&md,key,j); 325 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE); 326 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE); 327 EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL); 328 key= &(exp_key[0]); 329 330 if (k > 0) 331 { 332 EVP_DigestInit_ex(&md,EVP_md5(), NULL); 333 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE); 334 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE); 335 EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL); 336 iv= &(exp_iv[0]); 337 } 338 } 339 340 s->session->key_arg_length=0; 341 342 EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE)); 343 344 OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key)); 345 OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv)); 346 EVP_MD_CTX_cleanup(&md); 347 return(1); 348 err: 349 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE); 350 err2: 351 return(0); 352 } 353 354 int ssl3_setup_key_block(SSL *s) 355 { 356 unsigned char *p; 357 const EVP_CIPHER *c; 358 const EVP_MD *hash; 359 int num; 360 int ret = 0; 361 SSL_COMP *comp; 362 363 if (s->s3->tmp.key_block_length != 0) 364 return(1); 365 366 if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp)) 367 { 368 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE); 369 return(0); 370 } 371 372 s->s3->tmp.new_sym_enc=c; 373 s->s3->tmp.new_hash=hash; 374 #ifdef OPENSSL_NO_COMP 375 s->s3->tmp.new_compression=NULL; 376 #else 377 s->s3->tmp.new_compression=comp; 378 #endif 379 380 num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c); 381 num*=2; 382 383 ssl3_cleanup_key_block(s); 384 385 if ((p=OPENSSL_malloc(num)) == NULL) 386 goto err; 387 388 s->s3->tmp.key_block_length=num; 389 s->s3->tmp.key_block=p; 390 391 ret = ssl3_generate_key_block(s,p,num); 392 393 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) 394 { 395 /* enable vulnerability countermeasure for CBC ciphers with 396 * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt) 397 */ 398 s->s3->need_empty_fragments = 1; 399 400 if (s->session->cipher != NULL) 401 { 402 if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL) 403 s->s3->need_empty_fragments = 0; 404 405 #ifndef OPENSSL_NO_RC4 406 if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4) 407 s->s3->need_empty_fragments = 0; 408 #endif 409 } 410 } 411 412 return ret; 413 414 err: 415 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE); 416 return(0); 417 } 418 419 void ssl3_cleanup_key_block(SSL *s) 420 { 421 if (s->s3->tmp.key_block != NULL) 422 { 423 OPENSSL_cleanse(s->s3->tmp.key_block, 424 s->s3->tmp.key_block_length); 425 OPENSSL_free(s->s3->tmp.key_block); 426 s->s3->tmp.key_block=NULL; 427 } 428 s->s3->tmp.key_block_length=0; 429 } 430 431 int ssl3_enc(SSL *s, int send) 432 { 433 SSL3_RECORD *rec; 434 EVP_CIPHER_CTX *ds; 435 unsigned long l; 436 int bs,i; 437 const EVP_CIPHER *enc; 438 439 if (send) 440 { 441 ds=s->enc_write_ctx; 442 rec= &(s->s3->wrec); 443 if (s->enc_write_ctx == NULL) 444 enc=NULL; 445 else 446 enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx); 447 } 448 else 449 { 450 ds=s->enc_read_ctx; 451 rec= &(s->s3->rrec); 452 if (s->enc_read_ctx == NULL) 453 enc=NULL; 454 else 455 enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx); 456 } 457 458 if ((s->session == NULL) || (ds == NULL) || 459 (enc == NULL)) 460 { 461 memmove(rec->data,rec->input,rec->length); 462 rec->input=rec->data; 463 } 464 else 465 { 466 l=rec->length; 467 bs=EVP_CIPHER_block_size(ds->cipher); 468 469 /* COMPRESS */ 470 471 if ((bs != 1) && send) 472 { 473 i=bs-((int)l%bs); 474 475 /* we need to add 'i-1' padding bytes */ 476 l+=i; 477 rec->length+=i; 478 rec->input[l-1]=(i-1); 479 } 480 481 if (!send) 482 { 483 if (l == 0 || l%bs != 0) 484 { 485 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG); 486 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED); 487 return 0; 488 } 489 /* otherwise, rec->length >= bs */ 490 } 491 492 EVP_Cipher(ds,rec->data,rec->input,l); 493 494 if ((bs != 1) && !send) 495 { 496 i=rec->data[l-1]+1; 497 /* SSL 3.0 bounds the number of padding bytes by the block size; 498 * padding bytes (except the last one) are arbitrary */ 499 if (i > bs) 500 { 501 /* Incorrect padding. SSLerr() and ssl3_alert are done 502 * by caller: we don't want to reveal whether this is 503 * a decryption error or a MAC verification failure 504 * (see http://www.openssl.org/~bodo/tls-cbc.txt) */ 505 return -1; 506 } 507 /* now i <= bs <= rec->length */ 508 rec->length-=i; 509 } 510 } 511 return(1); 512 } 513 514 void ssl3_init_finished_mac(SSL *s) 515 { 516 EVP_DigestInit_ex(&(s->s3->finish_dgst1),s->ctx->md5, NULL); 517 EVP_DigestInit_ex(&(s->s3->finish_dgst2),s->ctx->sha1, NULL); 518 } 519 520 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len) 521 { 522 EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len); 523 EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len); 524 } 525 526 int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p) 527 { 528 return(ssl3_handshake_mac(s,ctx,NULL,0,p)); 529 } 530 531 int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2, 532 const char *sender, int len, unsigned char *p) 533 { 534 int ret; 535 536 ret=ssl3_handshake_mac(s,ctx1,sender,len,p); 537 p+=ret; 538 ret+=ssl3_handshake_mac(s,ctx2,sender,len,p); 539 return(ret); 540 } 541 542 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx, 543 const char *sender, int len, unsigned char *p) 544 { 545 unsigned int ret; 546 int npad,n; 547 unsigned int i; 548 unsigned char md_buf[EVP_MAX_MD_SIZE]; 549 EVP_MD_CTX ctx; 550 551 EVP_MD_CTX_init(&ctx); 552 EVP_MD_CTX_copy_ex(&ctx,in_ctx); 553 554 n=EVP_MD_CTX_size(&ctx); 555 npad=(48/n)*n; 556 557 if (sender != NULL) 558 EVP_DigestUpdate(&ctx,sender,len); 559 EVP_DigestUpdate(&ctx,s->session->master_key, 560 s->session->master_key_length); 561 EVP_DigestUpdate(&ctx,ssl3_pad_1,npad); 562 EVP_DigestFinal_ex(&ctx,md_buf,&i); 563 564 EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL); 565 EVP_DigestUpdate(&ctx,s->session->master_key, 566 s->session->master_key_length); 567 EVP_DigestUpdate(&ctx,ssl3_pad_2,npad); 568 EVP_DigestUpdate(&ctx,md_buf,i); 569 EVP_DigestFinal_ex(&ctx,p,&ret); 570 571 EVP_MD_CTX_cleanup(&ctx); 572 573 return((int)ret); 574 } 575 576 int ssl3_mac(SSL *ssl, unsigned char *md, int send) 577 { 578 SSL3_RECORD *rec; 579 unsigned char *mac_sec,*seq; 580 EVP_MD_CTX md_ctx; 581 const EVP_MD *hash; 582 unsigned char *p,rec_char; 583 unsigned int md_size; 584 int npad; 585 586 if (send) 587 { 588 rec= &(ssl->s3->wrec); 589 mac_sec= &(ssl->s3->write_mac_secret[0]); 590 seq= &(ssl->s3->write_sequence[0]); 591 hash=ssl->write_hash; 592 } 593 else 594 { 595 rec= &(ssl->s3->rrec); 596 mac_sec= &(ssl->s3->read_mac_secret[0]); 597 seq= &(ssl->s3->read_sequence[0]); 598 hash=ssl->read_hash; 599 } 600 601 md_size=EVP_MD_size(hash); 602 npad=(48/md_size)*md_size; 603 604 /* Chop the digest off the end :-) */ 605 EVP_MD_CTX_init(&md_ctx); 606 607 EVP_DigestInit_ex( &md_ctx,hash, NULL); 608 EVP_DigestUpdate(&md_ctx,mac_sec,md_size); 609 EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad); 610 EVP_DigestUpdate(&md_ctx,seq,8); 611 rec_char=rec->type; 612 EVP_DigestUpdate(&md_ctx,&rec_char,1); 613 p=md; 614 s2n(rec->length,p); 615 EVP_DigestUpdate(&md_ctx,md,2); 616 EVP_DigestUpdate(&md_ctx,rec->input,rec->length); 617 EVP_DigestFinal_ex( &md_ctx,md,NULL); 618 619 EVP_DigestInit_ex( &md_ctx,hash, NULL); 620 EVP_DigestUpdate(&md_ctx,mac_sec,md_size); 621 EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad); 622 EVP_DigestUpdate(&md_ctx,md,md_size); 623 EVP_DigestFinal_ex( &md_ctx,md,&md_size); 624 625 EVP_MD_CTX_cleanup(&md_ctx); 626 627 ssl3_record_sequence_update(seq); 628 return(md_size); 629 } 630 631 void ssl3_record_sequence_update(unsigned char *seq) 632 { 633 int i; 634 635 for (i=7; i>=0; i--) 636 { 637 ++seq[i]; 638 if (seq[i] != 0) break; 639 } 640 } 641 642 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p, 643 int len) 644 { 645 static const unsigned char *salt[3]={ 646 #ifndef CHARSET_EBCDIC 647 (const unsigned char *)"A", 648 (const unsigned char *)"BB", 649 (const unsigned char *)"CCC", 650 #else 651 (const unsigned char *)"\x41", 652 (const unsigned char *)"\x42\x42", 653 (const unsigned char *)"\x43\x43\x43", 654 #endif 655 }; 656 unsigned char buf[EVP_MAX_MD_SIZE]; 657 EVP_MD_CTX ctx; 658 int i,ret=0; 659 unsigned int n; 660 661 EVP_MD_CTX_init(&ctx); 662 for (i=0; i<3; i++) 663 { 664 EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL); 665 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i])); 666 EVP_DigestUpdate(&ctx,p,len); 667 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]), 668 SSL3_RANDOM_SIZE); 669 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]), 670 SSL3_RANDOM_SIZE); 671 EVP_DigestFinal_ex(&ctx,buf,&n); 672 673 EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL); 674 EVP_DigestUpdate(&ctx,p,len); 675 EVP_DigestUpdate(&ctx,buf,n); 676 EVP_DigestFinal_ex(&ctx,out,&n); 677 out+=n; 678 ret+=n; 679 } 680 EVP_MD_CTX_cleanup(&ctx); 681 return(ret); 682 } 683 684 int ssl3_alert_code(int code) 685 { 686 switch (code) 687 { 688 case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY); 689 case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE); 690 case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC); 691 case SSL_AD_DECRYPTION_FAILED: return(SSL3_AD_BAD_RECORD_MAC); 692 case SSL_AD_RECORD_OVERFLOW: return(SSL3_AD_BAD_RECORD_MAC); 693 case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE); 694 case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE); 695 case SSL_AD_NO_CERTIFICATE: return(SSL3_AD_NO_CERTIFICATE); 696 case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE); 697 case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE); 698 case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED); 699 case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED); 700 case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN); 701 case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER); 702 case SSL_AD_UNKNOWN_CA: return(SSL3_AD_BAD_CERTIFICATE); 703 case SSL_AD_ACCESS_DENIED: return(SSL3_AD_HANDSHAKE_FAILURE); 704 case SSL_AD_DECODE_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); 705 case SSL_AD_DECRYPT_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); 706 case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE); 707 case SSL_AD_PROTOCOL_VERSION: return(SSL3_AD_HANDSHAKE_FAILURE); 708 case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE); 709 case SSL_AD_INTERNAL_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); 710 case SSL_AD_USER_CANCELLED: return(SSL3_AD_HANDSHAKE_FAILURE); 711 case SSL_AD_NO_RENEGOTIATION: return(-1); /* Don't send it :-) */ 712 default: return(-1); 713 } 714 } 715 716