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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
119static 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
167static 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
188static 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
220int 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 const SSL_COMP *comp;
235 const EVP_MD *m;
236 int is_export,n,i,j,k,exp_label_len,cl;
237 int reuse_dd = 0;
238
239 is_export=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
240 c=s->s3->tmp.new_sym_enc;
241 m=s->s3->tmp.new_hash;
242 comp=s->s3->tmp.new_compression;
243 key_block=s->s3->tmp.key_block;
244
245#ifdef KSSL_DEBUG
246 printf("tls1_change_cipher_state(which= %d) w/\n", which);
247 printf("\talg= %ld, comp= %p\n", s->s3->tmp.new_cipher->algorithms,
248 comp);
249 printf("\tevp_cipher == %p ==? &d_cbc_ede_cipher3\n", c);
250 printf("\tevp_cipher: nid, blksz= %d, %d, keylen=%d, ivlen=%d\n",
251 c->nid,c->block_size,c->key_len,c->iv_len);
252 printf("\tkey_block: len= %d, data= ", s->s3->tmp.key_block_length);
253 {
254 int i;
255 for (i=0; i<s->s3->tmp.key_block_length; i++)
256 printf("%02x", key_block[i]); printf("\n");
257 }
258#endif /* KSSL_DEBUG */
259
260 if (which & SSL3_CC_READ)
261 {
262 if (s->enc_read_ctx != NULL)
263 reuse_dd = 1;
264 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
265 goto err;
266 dd= s->enc_read_ctx;
267 s->read_hash=m;
268 if (s->expand != NULL)
269 {
270 COMP_CTX_free(s->expand);
271 s->expand=NULL;
272 }
273 if (comp != NULL)
274 {
275 s->expand=COMP_CTX_new(comp->method);
276 if (s->expand == NULL)
277 {
278 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
279 goto err2;
280 }
281 if (s->s3->rrec.comp == NULL)
282 s->s3->rrec.comp=(unsigned char *)
283 OPENSSL_malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH);
284 if (s->s3->rrec.comp == NULL)
285 goto err;
286 }
287 memset(&(s->s3->read_sequence[0]),0,8);
288 mac_secret= &(s->s3->read_mac_secret[0]);
289 }
290 else
291 {
292 if (s->enc_write_ctx != NULL)
293 reuse_dd = 1;
294 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
295 goto err;
296 if ((s->enc_write_ctx == NULL) &&
297 ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
298 OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
299 goto err;
300 dd= s->enc_write_ctx;
301 s->write_hash=m;
302 if (s->compress != NULL)
303 {
304 COMP_CTX_free(s->compress);
305 s->compress=NULL;
306 }
307 if (comp != NULL)
308 {
309 s->compress=COMP_CTX_new(comp->method);
310 if (s->compress == NULL)
311 {
312 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
313 goto err2;
314 }
315 }
316 memset(&(s->s3->write_sequence[0]),0,8);
317 mac_secret= &(s->s3->write_mac_secret[0]);
318 }
319
320 if (reuse_dd)
321 EVP_CIPHER_CTX_cleanup(dd);
322 EVP_CIPHER_CTX_init(dd);
323
324 p=s->s3->tmp.key_block;
325 i=EVP_MD_size(m);
326 cl=EVP_CIPHER_key_length(c);
327 j=is_export ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
328 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
329 /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
330 k=EVP_CIPHER_iv_length(c);
331 er1= &(s->s3->client_random[0]);
332 er2= &(s->s3->server_random[0]);
333 if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
334 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
335 {
336 ms= &(p[ 0]); n=i+i;
337 key= &(p[ n]); n+=j+j;
338 iv= &(p[ n]); n+=k+k;
339 exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST;
340 exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE;
341 client_write=1;
342 }
343 else
344 {
345 n=i;
346 ms= &(p[ n]); n+=i+j;
347 key= &(p[ n]); n+=j+k;
348 iv= &(p[ n]); n+=k;
349 exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST;
350 exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE;
351 client_write=0;
352 }
353
354 if (n > s->s3->tmp.key_block_length)
355 {
356 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
357 goto err2;
358 }
359
360 memcpy(mac_secret,ms,i);
361#ifdef TLS_DEBUG
362printf("which = %04X\nmac key=",which);
363{ int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); }
364#endif
365 if (is_export)
366 {
367 /* In here I set both the read and write key/iv to the
368 * same value since only the correct one will be used :-).
369 */
370 p=buf;
371 memcpy(p,exp_label,exp_label_len);
372 p+=exp_label_len;
373 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
374 p+=SSL3_RANDOM_SIZE;
375 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
376 p+=SSL3_RANDOM_SIZE;
377 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),key,j,
378 tmp1,tmp2,EVP_CIPHER_key_length(c));
379 key=tmp1;
380
381 if (k > 0)
382 {
383 p=buf;
384 memcpy(p,TLS_MD_IV_BLOCK_CONST,
385 TLS_MD_IV_BLOCK_CONST_SIZE);
386 p+=TLS_MD_IV_BLOCK_CONST_SIZE;
387 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
388 p+=SSL3_RANDOM_SIZE;
389 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
390 p+=SSL3_RANDOM_SIZE;
391 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,p-buf,empty,0,
392 iv1,iv2,k*2);
393 if (client_write)
394 iv=iv1;
395 else
396 iv= &(iv1[k]);
397 }
398 }
399
400 s->session->key_arg_length=0;
401#ifdef KSSL_DEBUG
402 {
403 int i;
404 printf("EVP_CipherInit_ex(dd,c,key=,iv=,which)\n");
405 printf("\tkey= "); for (i=0; i<c->key_len; i++) printf("%02x", key[i]);
406 printf("\n");
407 printf("\t iv= "); for (i=0; i<c->iv_len; i++) printf("%02x", iv[i]);
408 printf("\n");
409 }
410#endif /* KSSL_DEBUG */
411
412 EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
413#ifdef TLS_DEBUG
414printf("which = %04X\nkey=",which);
415{ int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); }
416printf("\niv=");
417{ int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); }
418printf("\n");
419#endif
420
421 OPENSSL_cleanse(tmp1,sizeof(tmp1));
422 OPENSSL_cleanse(tmp2,sizeof(tmp1));
423 OPENSSL_cleanse(iv1,sizeof(iv1));
424 OPENSSL_cleanse(iv2,sizeof(iv2));
425 return(1);
426err:
427 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
428err2:
429 return(0);
430 }
431
432int tls1_setup_key_block(SSL *s)
433 {
434 unsigned char *p1,*p2;
435 const EVP_CIPHER *c;
436 const EVP_MD *hash;
437 int num;
438 SSL_COMP *comp;
439
440#ifdef KSSL_DEBUG
441 printf ("tls1_setup_key_block()\n");
442#endif /* KSSL_DEBUG */
443
444 if (s->s3->tmp.key_block_length != 0)
445 return(1);
446
447 if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
448 {
449 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
450 return(0);
451 }
452
453 s->s3->tmp.new_sym_enc=c;
454 s->s3->tmp.new_hash=hash;
455
456 num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
457 num*=2;
458
459 ssl3_cleanup_key_block(s);
460
461 if ((p1=(unsigned char *)OPENSSL_malloc(num)) == NULL)
462 goto err;
463 if ((p2=(unsigned char *)OPENSSL_malloc(num)) == NULL)
464 goto err;
465
466 s->s3->tmp.key_block_length=num;
467 s->s3->tmp.key_block=p1;
468
469
470#ifdef TLS_DEBUG
471printf("client random\n");
472{ int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); }
473printf("server random\n");
474{ int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); }
475printf("pre-master\n");
476{ int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); }
477#endif
478 tls1_generate_key_block(s,p1,p2,num);
479 OPENSSL_cleanse(p2,num);
480 OPENSSL_free(p2);
481#ifdef TLS_DEBUG
482printf("\nkey block\n");
483{ int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); }
484#endif
485
486 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
487 {
488 /* enable vulnerability countermeasure for CBC ciphers with
489 * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
490 */
491 s->s3->need_empty_fragments = 1;
492
493 if (s->session->cipher != NULL)
494 {
495 if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL)
496 s->s3->need_empty_fragments = 0;
497
498#ifndef OPENSSL_NO_RC4
499 if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4)
500 s->s3->need_empty_fragments = 0;
501#endif
502 }
503 }
504
505 return(1);
506err:
507 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
508 return(0);
509 }
510
511int tls1_enc(SSL *s, int send)
512 {
513 SSL3_RECORD *rec;
514 EVP_CIPHER_CTX *ds;
515 unsigned long l;
516 int bs,i,ii,j,k,n=0;
517 const EVP_CIPHER *enc;
518
519 if (send)
520 {
521 if (s->write_hash != NULL)
522 n=EVP_MD_size(s->write_hash);
523 ds=s->enc_write_ctx;
524 rec= &(s->s3->wrec);
525 if (s->enc_write_ctx == NULL)
526 enc=NULL;
527 else
528 enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
529 }
530 else
531 {
532 if (s->read_hash != NULL)
533 n=EVP_MD_size(s->read_hash);
534 ds=s->enc_read_ctx;
535 rec= &(s->s3->rrec);
536 if (s->enc_read_ctx == NULL)
537 enc=NULL;
538 else
539 enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
540 }
541
542#ifdef KSSL_DEBUG
543 printf("tls1_enc(%d)\n", send);
544#endif /* KSSL_DEBUG */
545
546 if ((s->session == NULL) || (ds == NULL) ||
547 (enc == NULL))
548 {
549 memmove(rec->data,rec->input,rec->length);
550 rec->input=rec->data;
551 }
552 else
553 {
554 l=rec->length;
555 bs=EVP_CIPHER_block_size(ds->cipher);
556
557 if ((bs != 1) && send)
558 {
559 i=bs-((int)l%bs);
560
561 /* Add weird padding of upto 256 bytes */
562
563 /* we need to add 'i' padding bytes of value j */
564 j=i-1;
565 if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG)
566 {
567 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
568 j++;
569 }
570 for (k=(int)l; k<(int)(l+i); k++)
571 rec->input[k]=j;
572 l+=i;
573 rec->length+=i;
574 }
575
576#ifdef KSSL_DEBUG
577 {
578 unsigned long ui;
579 printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n",
580 ds,rec->data,rec->input,l);
581 printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n",
582 ds->buf_len, ds->cipher->key_len,
583 DES_KEY_SZ, DES_SCHEDULE_SZ,
584 ds->cipher->iv_len);
585 printf("\t\tIV: ");
586 for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]);
587 printf("\n");
588 printf("\trec->input=");
589 for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]);
590 printf("\n");
591 }
592#endif /* KSSL_DEBUG */
593
594 if (!send)
595 {
596 if (l == 0 || l%bs != 0)
597 {
598 SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
599 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
600 return 0;
601 }
602 }
603
604 EVP_Cipher(ds,rec->data,rec->input,l);
605
606#ifdef KSSL_DEBUG
607 {
608 unsigned long i;
609 printf("\trec->data=");
610 for (i=0; i<l; i++)
611 printf(" %02x", rec->data[i]); printf("\n");
612 }
613#endif /* KSSL_DEBUG */
614
615 if ((bs != 1) && !send)
616 {
617 ii=i=rec->data[l-1]; /* padding_length */
618 i++;
619 if (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG)
620 {
621 /* First packet is even in size, so check */
622 if ((memcmp(s->s3->read_sequence,
623 "\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1))
624 s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG;
625 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
626 i--;
627 }
628 /* TLS 1.0 does not bound the number of padding bytes by the block size.
629 * All of them must have value 'padding_length'. */
630 if (i > (int)rec->length)
631 {
632 /* Incorrect padding. SSLerr() and ssl3_alert are done
633 * by caller: we don't want to reveal whether this is
634 * a decryption error or a MAC verification failure
635 * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
636 return -1;
637 }
638 for (j=(int)(l-i); j<(int)l; j++)
639 {
640 if (rec->data[j] != ii)
641 {
642 /* Incorrect padding */
643 return -1;
644 }
645 }
646 rec->length-=i;
647 }
648 }
649 return(1);
650 }
651
652int tls1_cert_verify_mac(SSL *s, EVP_MD_CTX *in_ctx, unsigned char *out)
653 {
654 unsigned int ret;
655 EVP_MD_CTX ctx;
656
657 EVP_MD_CTX_init(&ctx);
658 EVP_MD_CTX_copy_ex(&ctx,in_ctx);
659 EVP_DigestFinal_ex(&ctx,out,&ret);
660 EVP_MD_CTX_cleanup(&ctx);
661 return((int)ret);
662 }
663
664int tls1_final_finish_mac(SSL *s, EVP_MD_CTX *in1_ctx, EVP_MD_CTX *in2_ctx,
665 const char *str, int slen, unsigned char *out)
666 {
667 unsigned int i;
668 EVP_MD_CTX ctx;
669 unsigned char buf[TLS_MD_MAX_CONST_SIZE+MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
670 unsigned char *q,buf2[12];
671
672 q=buf;
673 memcpy(q,str,slen);
674 q+=slen;
675
676 EVP_MD_CTX_init(&ctx);
677 EVP_MD_CTX_copy_ex(&ctx,in1_ctx);
678 EVP_DigestFinal_ex(&ctx,q,&i);
679 q+=i;
680 EVP_MD_CTX_copy_ex(&ctx,in2_ctx);
681 EVP_DigestFinal_ex(&ctx,q,&i);
682 q+=i;
683
684 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(q-buf),
685 s->session->master_key,s->session->master_key_length,
686 out,buf2,sizeof buf2);
687 EVP_MD_CTX_cleanup(&ctx);
688
689 return sizeof buf2;
690 }
691
692int tls1_mac(SSL *ssl, unsigned char *md, int send)
693 {
694 SSL3_RECORD *rec;
695 unsigned char *mac_sec,*seq;
696 const EVP_MD *hash;
697 unsigned int md_size;
698 int i;
699 HMAC_CTX hmac;
700 unsigned char buf[5];
701
702 if (send)
703 {
704 rec= &(ssl->s3->wrec);
705 mac_sec= &(ssl->s3->write_mac_secret[0]);
706 seq= &(ssl->s3->write_sequence[0]);
707 hash=ssl->write_hash;
708 }
709 else
710 {
711 rec= &(ssl->s3->rrec);
712 mac_sec= &(ssl->s3->read_mac_secret[0]);
713 seq= &(ssl->s3->read_sequence[0]);
714 hash=ssl->read_hash;
715 }
716
717 md_size=EVP_MD_size(hash);
718
719 buf[0]=rec->type;
720 buf[1]=TLS1_VERSION_MAJOR;
721 buf[2]=TLS1_VERSION_MINOR;
722 buf[3]=rec->length>>8;
723 buf[4]=rec->length&0xff;
724
725 /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */
726 HMAC_CTX_init(&hmac);
727 HMAC_Init_ex(&hmac,mac_sec,EVP_MD_size(hash),hash,NULL);
728 HMAC_Update(&hmac,seq,8);
729 HMAC_Update(&hmac,buf,5);
730 HMAC_Update(&hmac,rec->input,rec->length);
731 HMAC_Final(&hmac,md,&md_size);
732 HMAC_CTX_cleanup(&hmac);
733
734#ifdef TLS_DEBUG
735printf("sec=");
736{unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); }
737printf("seq=");
738{int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); }
739printf("buf=");
740{int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); }
741printf("rec=");
742{unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); }
743#endif
744
745 for (i=7; i>=0; i--)
746 {
747 ++seq[i];
748 if (seq[i] != 0) break;
749 }
750
751#ifdef TLS_DEBUG
752{unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); }
753#endif
754 return(md_size);
755 }
756
757int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
758 int len)
759 {
760 unsigned char buf[SSL3_RANDOM_SIZE*2+TLS_MD_MASTER_SECRET_CONST_SIZE];
761 unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH];
762
763#ifdef KSSL_DEBUG
764 printf ("tls1_generate_master_secret(%p,%p, %p, %d)\n", s,out, p,len);
765#endif /* KSSL_DEBUG */
766
767 /* Setup the stuff to munge */
768 memcpy(buf,TLS_MD_MASTER_SECRET_CONST,
769 TLS_MD_MASTER_SECRET_CONST_SIZE);
770 memcpy(&(buf[TLS_MD_MASTER_SECRET_CONST_SIZE]),
771 s->s3->client_random,SSL3_RANDOM_SIZE);
772 memcpy(&(buf[SSL3_RANDOM_SIZE+TLS_MD_MASTER_SECRET_CONST_SIZE]),
773 s->s3->server_random,SSL3_RANDOM_SIZE);
774 tls1_PRF(s->ctx->md5,s->ctx->sha1,
775 buf,TLS_MD_MASTER_SECRET_CONST_SIZE+SSL3_RANDOM_SIZE*2,p,len,
776 s->session->master_key,buff,sizeof buff);
777#ifdef KSSL_DEBUG
778 printf ("tls1_generate_master_secret() complete\n");
779#endif /* KSSL_DEBUG */
780 return(SSL3_MASTER_SECRET_SIZE);
781 }
782
783int tls1_alert_code(int code)
784 {
785 switch (code)
786 {
787 case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY);
788 case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
789 case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC);
790 case SSL_AD_DECRYPTION_FAILED: return(TLS1_AD_DECRYPTION_FAILED);
791 case SSL_AD_RECORD_OVERFLOW: return(TLS1_AD_RECORD_OVERFLOW);
792 case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
793 case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE);
794 case SSL_AD_NO_CERTIFICATE: return(-1);
795 case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE);
796 case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
797 case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
798 case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
799 case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
800 case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER);
801 case SSL_AD_UNKNOWN_CA: return(TLS1_AD_UNKNOWN_CA);
802 case SSL_AD_ACCESS_DENIED: return(TLS1_AD_ACCESS_DENIED);
803 case SSL_AD_DECODE_ERROR: return(TLS1_AD_DECODE_ERROR);
804 case SSL_AD_DECRYPT_ERROR: return(TLS1_AD_DECRYPT_ERROR);
805 case SSL_AD_EXPORT_RESTRICTION: return(TLS1_AD_EXPORT_RESTRICTION);
806 case SSL_AD_PROTOCOL_VERSION: return(TLS1_AD_PROTOCOL_VERSION);
807 case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY);
808 case SSL_AD_INTERNAL_ERROR: return(TLS1_AD_INTERNAL_ERROR);
809 case SSL_AD_USER_CANCELLED: return(TLS1_AD_USER_CANCELLED);
810 case SSL_AD_NO_RENEGOTIATION: return(TLS1_AD_NO_RENEGOTIATION);
811 default: return(-1);
812 }
813 }
814
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