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1/* ssl/t1_enc.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58/* ====================================================================
59 * Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved.
60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
67 *
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
71 * distribution.
72 *
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 *
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
82 *
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 * acknowledgment:
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
105 *
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
109 *
110 */
111
112#include <stdio.h>
113#include "ssl_locl.h"
114#include <openssl/comp.h>
115#include <openssl/evp.h>
116#include <openssl/hmac.h>
117#include <openssl/md5.h>
118#include <openssl/fips.h>
119
120static void tls1_P_hash(const EVP_MD *md, const unsigned char *sec,
121 int sec_len, unsigned char *seed, int seed_len,
122 unsigned char *out, int olen)
123 {
124 int chunk,n;
125 unsigned int j;
126 HMAC_CTX ctx;
127 HMAC_CTX ctx_tmp;
128 unsigned char A1[EVP_MAX_MD_SIZE];
129 unsigned int A1_len;
130
131 chunk=EVP_MD_size(md);
132
133 HMAC_CTX_init(&ctx);
134 HMAC_CTX_init(&ctx_tmp);
135 HMAC_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
136 HMAC_CTX_set_flags(&ctx_tmp, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
137 HMAC_Init_ex(&ctx,sec,sec_len,md, NULL);
138 HMAC_Init_ex(&ctx_tmp,sec,sec_len,md, NULL);
139 HMAC_Update(&ctx,seed,seed_len);
140 HMAC_Final(&ctx,A1,&A1_len);
141
142 n=0;
143 for (;;)
144 {
145 HMAC_Init_ex(&ctx,NULL,0,NULL,NULL); /* re-init */
146 HMAC_Init_ex(&ctx_tmp,NULL,0,NULL,NULL); /* re-init */
147 HMAC_Update(&ctx,A1,A1_len);
148 HMAC_Update(&ctx_tmp,A1,A1_len);
149 HMAC_Update(&ctx,seed,seed_len);
150
151 if (olen > chunk)
152 {
153 HMAC_Final(&ctx,out,&j);
154 out+=j;
155 olen-=j;
156 HMAC_Final(&ctx_tmp,A1,&A1_len); /* calc the next A1 value */
157 }
158 else /* last one */
159 {
160 HMAC_Final(&ctx,A1,&A1_len);
161 memcpy(out,A1,olen);
162 break;
163 }
164 }
165 HMAC_CTX_cleanup(&ctx);
166 HMAC_CTX_cleanup(&ctx_tmp);
167 OPENSSL_cleanse(A1,sizeof(A1));
168 }
169
170static void tls1_PRF(const EVP_MD *md5, const EVP_MD *sha1,
171 unsigned char *label, int label_len,
172 const unsigned char *sec, int slen, unsigned char *out1,
173 unsigned char *out2, int olen)
174 {
175 int len,i;
176 const unsigned char *S1,*S2;
177
178 len=slen/2;
179 S1=sec;
180 S2= &(sec[len]);
181 len+=(slen&1); /* add for odd, make longer */
182
183 tls1_P_hash(md5 ,S1,len,label,label_len,out1,olen);
184 tls1_P_hash(sha1,S2,len,label,label_len,out2,olen);
185
186 for (i=0; i<olen; i++)
187 out1[i]^=out2[i];
188 }
189
190static void tls1_generate_key_block(SSL *s, unsigned char *km,
191 unsigned char *tmp, int num)
192 {
193 unsigned char *p;
194 unsigned char buf[SSL3_RANDOM_SIZE*2+
195 TLS_MD_MAX_CONST_SIZE];
196 p=buf;
197
198 memcpy(p,TLS_MD_KEY_EXPANSION_CONST,
199 TLS_MD_KEY_EXPANSION_CONST_SIZE);
200 p+=TLS_MD_KEY_EXPANSION_CONST_SIZE;
201 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
202 p+=SSL3_RANDOM_SIZE;
203 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
204 p+=SSL3_RANDOM_SIZE;
205
206 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),
207 s->session->master_key,s->session->master_key_length,
208 km,tmp,num);
209#ifdef KSSL_DEBUG
210 printf("tls1_generate_key_block() ==> %d byte master_key =\n\t",
211 s->session->master_key_length);
212 {
213 int i;
214 for (i=0; i < s->session->master_key_length; i++)
215 {
216 printf("%02X", s->session->master_key[i]);
217 }
218 printf("\n"); }
219#endif /* KSSL_DEBUG */
220 }
221
222int tls1_change_cipher_state(SSL *s, int which)
223 {
224 static const unsigned char empty[]="";
225 unsigned char *p,*key_block,*mac_secret;
226 unsigned char *exp_label,buf[TLS_MD_MAX_CONST_SIZE+
227 SSL3_RANDOM_SIZE*2];
228 unsigned char tmp1[EVP_MAX_KEY_LENGTH];
229 unsigned char tmp2[EVP_MAX_KEY_LENGTH];
230 unsigned char iv1[EVP_MAX_IV_LENGTH*2];
231 unsigned char iv2[EVP_MAX_IV_LENGTH*2];
232 unsigned char *ms,*key,*iv,*er1,*er2;
233 int client_write;
234 EVP_CIPHER_CTX *dd;
235 const EVP_CIPHER *c;
236 const SSL_COMP *comp;
237 const EVP_MD *m;
238 int is_export,n,i,j,k,exp_label_len,cl;
239 int reuse_dd = 0;
240
241 is_export=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
242 c=s->s3->tmp.new_sym_enc;
243 m=s->s3->tmp.new_hash;
244 comp=s->s3->tmp.new_compression;
245 key_block=s->s3->tmp.key_block;
246
247#ifdef KSSL_DEBUG
248 printf("tls1_change_cipher_state(which= %d) w/\n", which);
249 printf("\talg= %ld, comp= %p\n", s->s3->tmp.new_cipher->algorithms,
250 comp);
251 printf("\tevp_cipher == %p ==? &d_cbc_ede_cipher3\n", c);
252 printf("\tevp_cipher: nid, blksz= %d, %d, keylen=%d, ivlen=%d\n",
253 c->nid,c->block_size,c->key_len,c->iv_len);
254 printf("\tkey_block: len= %d, data= ", s->s3->tmp.key_block_length);
255 {
256 int i;
257 for (i=0; i<s->s3->tmp.key_block_length; i++)
258 printf("%02x", key_block[i]); printf("\n");
259 }
260#endif /* KSSL_DEBUG */
261
262 if (which & SSL3_CC_READ)
263 {
264 if (s->enc_read_ctx != NULL)
265 reuse_dd = 1;
266 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
267 goto err;
268 dd= s->enc_read_ctx;
269 s->read_hash=m;
270 if (s->expand != NULL)
271 {
272 COMP_CTX_free(s->expand);
273 s->expand=NULL;
274 }
275 if (comp != NULL)
276 {
277 s->expand=COMP_CTX_new(comp->method);
278 if (s->expand == NULL)
279 {
280 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
281 goto err2;
282 }
283 if (s->s3->rrec.comp == NULL)
284 s->s3->rrec.comp=(unsigned char *)
285 OPENSSL_malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH);
286 if (s->s3->rrec.comp == NULL)
287 goto err;
288 }
289 memset(&(s->s3->read_sequence[0]),0,8);
290 mac_secret= &(s->s3->read_mac_secret[0]);
291 }
292 else
293 {
294 if (s->enc_write_ctx != NULL)
295 reuse_dd = 1;
296 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
297 goto err;
298 if ((s->enc_write_ctx == NULL) &&
299 ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
300 OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
301 goto err;
302 dd= s->enc_write_ctx;
303 s->write_hash=m;
304 if (s->compress != NULL)
305 {
306 COMP_CTX_free(s->compress);
307 s->compress=NULL;
308 }
309 if (comp != NULL)
310 {
311 s->compress=COMP_CTX_new(comp->method);
312 if (s->compress == NULL)
313 {
314 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
315 goto err2;
316 }
317 }
318 memset(&(s->s3->write_sequence[0]),0,8);
319 mac_secret= &(s->s3->write_mac_secret[0]);
320 }
321
322 if (reuse_dd)
323 EVP_CIPHER_CTX_cleanup(dd);
324 EVP_CIPHER_CTX_init(dd);
325
326 p=s->s3->tmp.key_block;
327 i=EVP_MD_size(m);
328 cl=EVP_CIPHER_key_length(c);
329 j=is_export ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
330 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
331 /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
332 k=EVP_CIPHER_iv_length(c);
333 er1= &(s->s3->client_random[0]);
334 er2= &(s->s3->server_random[0]);
335 if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
336 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
337 {
338 ms= &(p[ 0]); n=i+i;
339 key= &(p[ n]); n+=j+j;
340 iv= &(p[ n]); n+=k+k;
341 exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST;
342 exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE;
343 client_write=1;
344 }
345 else
346 {
347 n=i;
348 ms= &(p[ n]); n+=i+j;
349 key= &(p[ n]); n+=j+k;
350 iv= &(p[ n]); n+=k;
351 exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST;
352 exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE;
353 client_write=0;
354 }
355
356 if (n > s->s3->tmp.key_block_length)
357 {
358 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
359 goto err2;
360 }
361
362 memcpy(mac_secret,ms,i);
363#ifdef TLS_DEBUG
364printf("which = %04X\nmac key=",which);
365{ int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); }
366#endif
367 if (is_export)
368 {
369 /* In here I set both the read and write key/iv to the
370 * same value since only the correct one will be used :-).
371 */
372 p=buf;
373 memcpy(p,exp_label,exp_label_len);
374 p+=exp_label_len;
375 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
376 p+=SSL3_RANDOM_SIZE;
377 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
378 p+=SSL3_RANDOM_SIZE;
379 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),key,j,
380 tmp1,tmp2,EVP_CIPHER_key_length(c));
381 key=tmp1;
382
383 if (k > 0)
384 {
385 p=buf;
386 memcpy(p,TLS_MD_IV_BLOCK_CONST,
387 TLS_MD_IV_BLOCK_CONST_SIZE);
388 p+=TLS_MD_IV_BLOCK_CONST_SIZE;
389 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
390 p+=SSL3_RANDOM_SIZE;
391 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
392 p+=SSL3_RANDOM_SIZE;
393 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,p-buf,empty,0,
394 iv1,iv2,k*2);
395 if (client_write)
396 iv=iv1;
397 else
398 iv= &(iv1[k]);
399 }
400 }
401
402 s->session->key_arg_length=0;
403#ifdef KSSL_DEBUG
404 {
405 int i;
406 printf("EVP_CipherInit_ex(dd,c,key=,iv=,which)\n");
407 printf("\tkey= "); for (i=0; i<c->key_len; i++) printf("%02x", key[i]);
408 printf("\n");
409 printf("\t iv= "); for (i=0; i<c->iv_len; i++) printf("%02x", iv[i]);
410 printf("\n");
411 }
412#endif /* KSSL_DEBUG */
413
414 EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
415#ifdef TLS_DEBUG
416printf("which = %04X\nkey=",which);
417{ int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); }
418printf("\niv=");
419{ int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); }
420printf("\n");
421#endif
422
423 OPENSSL_cleanse(tmp1,sizeof(tmp1));
424 OPENSSL_cleanse(tmp2,sizeof(tmp1));
425 OPENSSL_cleanse(iv1,sizeof(iv1));
426 OPENSSL_cleanse(iv2,sizeof(iv2));
427 return(1);
428err:
429 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
430err2:
431 return(0);
432 }
433
434int tls1_setup_key_block(SSL *s)
435 {
436 unsigned char *p1,*p2;
437 const EVP_CIPHER *c;
438 const EVP_MD *hash;
439 int num;
440 SSL_COMP *comp;
441
442#ifdef KSSL_DEBUG
443 printf ("tls1_setup_key_block()\n");
444#endif /* KSSL_DEBUG */
445
446 if (s->s3->tmp.key_block_length != 0)
447 return(1);
448
449 if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
450 {
451 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
452 return(0);
453 }
454
455 s->s3->tmp.new_sym_enc=c;
456 s->s3->tmp.new_hash=hash;
457
458 num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
459 num*=2;
460
461 ssl3_cleanup_key_block(s);
462
463 if ((p1=(unsigned char *)OPENSSL_malloc(num)) == NULL)
464 goto err;
465 if ((p2=(unsigned char *)OPENSSL_malloc(num)) == NULL)
466 goto err;
467
468 s->s3->tmp.key_block_length=num;
469 s->s3->tmp.key_block=p1;
470
471
472#ifdef TLS_DEBUG
473printf("client random\n");
474{ int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); }
475printf("server random\n");
476{ int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); }
477printf("pre-master\n");
478{ int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); }
479#endif
480 tls1_generate_key_block(s,p1,p2,num);
481 OPENSSL_cleanse(p2,num);
482 OPENSSL_free(p2);
483#ifdef TLS_DEBUG
484printf("\nkey block\n");
485{ int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); }
486#endif
487
488 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
489 {
490 /* enable vulnerability countermeasure for CBC ciphers with
491 * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
492 */
493 s->s3->need_empty_fragments = 1;
494
495 if (s->session->cipher != NULL)
496 {
497 if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL)
498 s->s3->need_empty_fragments = 0;
499
500#ifndef OPENSSL_NO_RC4
501 if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4)
502 s->s3->need_empty_fragments = 0;
503#endif
504 }
505 }
506
507 return(1);
508err:
509 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
510 return(0);
511 }
512
513int tls1_enc(SSL *s, int send)
514 {
515 SSL3_RECORD *rec;
516 EVP_CIPHER_CTX *ds;
517 unsigned long l;
518 int bs,i,ii,j,k,n=0;
519 const EVP_CIPHER *enc;
520
521 if (send)
522 {
523 if (s->write_hash != NULL)
524 n=EVP_MD_size(s->write_hash);
525 ds=s->enc_write_ctx;
526 rec= &(s->s3->wrec);
527 if (s->enc_write_ctx == NULL)
528 enc=NULL;
529 else
530 enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
531 }
532 else
533 {
534 if (s->read_hash != NULL)
535 n=EVP_MD_size(s->read_hash);
536 ds=s->enc_read_ctx;
537 rec= &(s->s3->rrec);
538 if (s->enc_read_ctx == NULL)
539 enc=NULL;
540 else
541 enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
542 }
543
544#ifdef KSSL_DEBUG
545 printf("tls1_enc(%d)\n", send);
546#endif /* KSSL_DEBUG */
547
548 if ((s->session == NULL) || (ds == NULL) ||
549 (enc == NULL))
550 {
551 memmove(rec->data,rec->input,rec->length);
552 rec->input=rec->data;
553 }
554 else
555 {
556 l=rec->length;
557 bs=EVP_CIPHER_block_size(ds->cipher);
558
559 if ((bs != 1) && send)
560 {
561 i=bs-((int)l%bs);
562
563 /* Add weird padding of upto 256 bytes */
564
565 /* we need to add 'i' padding bytes of value j */
566 j=i-1;
567 if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG)
568 {
569 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
570 j++;
571 }
572 for (k=(int)l; k<(int)(l+i); k++)
573 rec->input[k]=j;
574 l+=i;
575 rec->length+=i;
576 }
577
578#ifdef KSSL_DEBUG
579 {
580 unsigned long ui;
581 printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n",
582 ds,rec->data,rec->input,l);
583 printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n",
584 ds->buf_len, ds->cipher->key_len,
585 DES_KEY_SZ, DES_SCHEDULE_SZ,
586 ds->cipher->iv_len);
587 printf("\t\tIV: ");
588 for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]);
589 printf("\n");
590 printf("\trec->input=");
591 for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]);
592 printf("\n");
593 }
594#endif /* KSSL_DEBUG */
595
596 if (!send)
597 {
598 if (l == 0 || l%bs != 0)
599 {
600 SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
601 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
602 return 0;
603 }
604 }
605
606 EVP_Cipher(ds,rec->data,rec->input,l);
607
608#ifdef KSSL_DEBUG
609 {
610 unsigned long i;
611 printf("\trec->data=");
612 for (i=0; i<l; i++)
613 printf(" %02x", rec->data[i]); printf("\n");
614 }
615#endif /* KSSL_DEBUG */
616
617 if ((bs != 1) && !send)
618 {
619 ii=i=rec->data[l-1]; /* padding_length */
620 i++;
621 if (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG)
622 {
623 /* First packet is even in size, so check */
624 if ((memcmp(s->s3->read_sequence,
625 "\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1))
626 s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG;
627 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
628 i--;
629 }
630 /* TLS 1.0 does not bound the number of padding bytes by the block size.
631 * All of them must have value 'padding_length'. */
632 if (i > (int)rec->length)
633 {
634 /* Incorrect padding. SSLerr() and ssl3_alert are done
635 * by caller: we don't want to reveal whether this is
636 * a decryption error or a MAC verification failure
637 * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
638 return -1;
639 }
640 for (j=(int)(l-i); j<(int)l; j++)
641 {
642 if (rec->data[j] != ii)
643 {
644 /* Incorrect padding */
645 return -1;
646 }
647 }
648 rec->length-=i;
649 }
650 }
651 return(1);
652 }
653
654int tls1_cert_verify_mac(SSL *s, EVP_MD_CTX *in_ctx, unsigned char *out)
655 {
656 unsigned int ret;
657 EVP_MD_CTX ctx;
658
659 EVP_MD_CTX_init(&ctx);
660 EVP_MD_CTX_copy_ex(&ctx,in_ctx);
661 EVP_DigestFinal_ex(&ctx,out,&ret);
662 EVP_MD_CTX_cleanup(&ctx);
663 return((int)ret);
664 }
665
666int tls1_final_finish_mac(SSL *s, EVP_MD_CTX *in1_ctx, EVP_MD_CTX *in2_ctx,
667 const char *str, int slen, unsigned char *out)
668 {
669 unsigned int i;
670 EVP_MD_CTX ctx;
671 unsigned char buf[TLS_MD_MAX_CONST_SIZE+MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
672 unsigned char *q,buf2[12];
673
674 q=buf;
675 memcpy(q,str,slen);
676 q+=slen;
677
678 EVP_MD_CTX_init(&ctx);
679 EVP_MD_CTX_copy_ex(&ctx,in1_ctx);
680 EVP_DigestFinal_ex(&ctx,q,&i);
681 q+=i;
682 EVP_MD_CTX_copy_ex(&ctx,in2_ctx);
683 EVP_DigestFinal_ex(&ctx,q,&i);
684 q+=i;
685
686 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(q-buf),
687 s->session->master_key,s->session->master_key_length,
688 out,buf2,sizeof buf2);
689 EVP_MD_CTX_cleanup(&ctx);
690
691 return sizeof buf2;
692 }
693
694int tls1_mac(SSL *ssl, unsigned char *md, int send)
695 {
696 SSL3_RECORD *rec;
697 unsigned char *mac_sec,*seq;
698 const EVP_MD *hash;
699 unsigned int md_size;
700 int i;
701 HMAC_CTX hmac;
702 unsigned char buf[5];
703
704 if (send)
705 {
706 rec= &(ssl->s3->wrec);
707 mac_sec= &(ssl->s3->write_mac_secret[0]);
708 seq= &(ssl->s3->write_sequence[0]);
709 hash=ssl->write_hash;
710 }
711 else
712 {
713 rec= &(ssl->s3->rrec);
714 mac_sec= &(ssl->s3->read_mac_secret[0]);
715 seq= &(ssl->s3->read_sequence[0]);
716 hash=ssl->read_hash;
717 }
718
719 md_size=EVP_MD_size(hash);
720
721 buf[0]=rec->type;
722 buf[1]=TLS1_VERSION_MAJOR;
723 buf[2]=TLS1_VERSION_MINOR;
724 buf[3]=rec->length>>8;
725 buf[4]=rec->length&0xff;
726
727 /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */
728 HMAC_CTX_init(&hmac);
729 HMAC_Init_ex(&hmac,mac_sec,EVP_MD_size(hash),hash,NULL);
730 HMAC_Update(&hmac,seq,8);
731 HMAC_Update(&hmac,buf,5);
732 HMAC_Update(&hmac,rec->input,rec->length);
733 HMAC_Final(&hmac,md,&md_size);
734 HMAC_CTX_cleanup(&hmac);
735
736#ifdef TLS_DEBUG
737printf("sec=");
738{unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); }
739printf("seq=");
740{int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); }
741printf("buf=");
742{int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); }
743printf("rec=");
744{unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); }
745#endif
746
747 for (i=7; i>=0; i--)
748 {
749 ++seq[i];
750 if (seq[i] != 0) break;
751 }
752
753#ifdef TLS_DEBUG
754{unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); }
755#endif
756 return(md_size);
757 }
758
759int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
760 int len)
761 {
762 unsigned char buf[SSL3_RANDOM_SIZE*2+TLS_MD_MASTER_SECRET_CONST_SIZE];
763 unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH];
764
765#ifdef KSSL_DEBUG
766 printf ("tls1_generate_master_secret(%p,%p, %p, %d)\n", s,out, p,len);
767#endif /* KSSL_DEBUG */
768
769 /* Setup the stuff to munge */
770 memcpy(buf,TLS_MD_MASTER_SECRET_CONST,
771 TLS_MD_MASTER_SECRET_CONST_SIZE);
772 memcpy(&(buf[TLS_MD_MASTER_SECRET_CONST_SIZE]),
773 s->s3->client_random,SSL3_RANDOM_SIZE);
774 memcpy(&(buf[SSL3_RANDOM_SIZE+TLS_MD_MASTER_SECRET_CONST_SIZE]),
775 s->s3->server_random,SSL3_RANDOM_SIZE);
776 tls1_PRF(s->ctx->md5,s->ctx->sha1,
777 buf,TLS_MD_MASTER_SECRET_CONST_SIZE+SSL3_RANDOM_SIZE*2,p,len,
778 s->session->master_key,buff,sizeof buff);
779#ifdef KSSL_DEBUG
780 printf ("tls1_generate_master_secret() complete\n");
781#endif /* KSSL_DEBUG */
782 return(SSL3_MASTER_SECRET_SIZE);
783 }
784
785int tls1_alert_code(int code)
786 {
787 switch (code)
788 {
789 case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY);
790 case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
791 case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC);
792 case SSL_AD_DECRYPTION_FAILED: return(TLS1_AD_DECRYPTION_FAILED);
793 case SSL_AD_RECORD_OVERFLOW: return(TLS1_AD_RECORD_OVERFLOW);
794 case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
795 case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE);
796 case SSL_AD_NO_CERTIFICATE: return(-1);
797 case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE);
798 case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
799 case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
800 case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
801 case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
802 case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER);
803 case SSL_AD_UNKNOWN_CA: return(TLS1_AD_UNKNOWN_CA);
804 case SSL_AD_ACCESS_DENIED: return(TLS1_AD_ACCESS_DENIED);
805 case SSL_AD_DECODE_ERROR: return(TLS1_AD_DECODE_ERROR);
806 case SSL_AD_DECRYPT_ERROR: return(TLS1_AD_DECRYPT_ERROR);
807 case SSL_AD_EXPORT_RESTRICTION: return(TLS1_AD_EXPORT_RESTRICTION);
808 case SSL_AD_PROTOCOL_VERSION: return(TLS1_AD_PROTOCOL_VERSION);
809 case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY);
810 case SSL_AD_INTERNAL_ERROR: return(TLS1_AD_INTERNAL_ERROR);
811 case SSL_AD_USER_CANCELLED: return(TLS1_AD_USER_CANCELLED);
812 case SSL_AD_NO_RENEGOTIATION: return(TLS1_AD_NO_RENEGOTIATION);
813 default: return(-1);
814 }
815 }
816
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