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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#ifndef OPENSSL_NO_COMP
115#include <openssl/comp.h>
116#endif
117#include <openssl/evp.h>
118#include <openssl/hmac.h>
119#include <openssl/md5.h>
120#ifdef KSSL_DEBUG
121#include <openssl/des.h>
122#endif
123
124static void tls1_P_hash(const EVP_MD *md, const unsigned char *sec,
125 int sec_len, unsigned char *seed, int seed_len,
126 unsigned char *out, int olen)
127 {
128 int chunk,n;
129 unsigned int j;
130 HMAC_CTX ctx;
131 HMAC_CTX ctx_tmp;
132 unsigned char A1[EVP_MAX_MD_SIZE];
133 unsigned int A1_len;
134
135 chunk=EVP_MD_size(md);
136
137 HMAC_CTX_init(&ctx);
138 HMAC_CTX_init(&ctx_tmp);
139 HMAC_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
140 HMAC_CTX_set_flags(&ctx_tmp, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
141 HMAC_Init_ex(&ctx,sec,sec_len,md, NULL);
142 HMAC_Init_ex(&ctx_tmp,sec,sec_len,md, NULL);
143 HMAC_Update(&ctx,seed,seed_len);
144 HMAC_Final(&ctx,A1,&A1_len);
145
146 n=0;
147 for (;;)
148 {
149 HMAC_Init_ex(&ctx,NULL,0,NULL,NULL); /* re-init */
150 HMAC_Init_ex(&ctx_tmp,NULL,0,NULL,NULL); /* re-init */
151 HMAC_Update(&ctx,A1,A1_len);
152 HMAC_Update(&ctx_tmp,A1,A1_len);
153 HMAC_Update(&ctx,seed,seed_len);
154
155 if (olen > chunk)
156 {
157 HMAC_Final(&ctx,out,&j);
158 out+=j;
159 olen-=j;
160 HMAC_Final(&ctx_tmp,A1,&A1_len); /* calc the next A1 value */
161 }
162 else /* last one */
163 {
164 HMAC_Final(&ctx,A1,&A1_len);
165 memcpy(out,A1,olen);
166 break;
167 }
168 }
169 HMAC_CTX_cleanup(&ctx);
170 HMAC_CTX_cleanup(&ctx_tmp);
171 OPENSSL_cleanse(A1,sizeof(A1));
172 }
173
174static void tls1_PRF(const EVP_MD *md5, const EVP_MD *sha1,
175 unsigned char *label, int label_len,
176 const unsigned char *sec, int slen, unsigned char *out1,
177 unsigned char *out2, int olen)
178 {
179 int len,i;
180 const unsigned char *S1,*S2;
181
182 len=slen/2;
183 S1=sec;
184 S2= &(sec[len]);
185 len+=(slen&1); /* add for odd, make longer */
186
187
188 tls1_P_hash(md5 ,S1,len,label,label_len,out1,olen);
189 tls1_P_hash(sha1,S2,len,label,label_len,out2,olen);
190
191 for (i=0; i<olen; i++)
192 out1[i]^=out2[i];
193 }
194
195static void tls1_generate_key_block(SSL *s, unsigned char *km,
196 unsigned char *tmp, int num)
197 {
198 unsigned char *p;
199 unsigned char buf[SSL3_RANDOM_SIZE*2+
200 TLS_MD_MAX_CONST_SIZE];
201 p=buf;
202
203 memcpy(p,TLS_MD_KEY_EXPANSION_CONST,
204 TLS_MD_KEY_EXPANSION_CONST_SIZE);
205 p+=TLS_MD_KEY_EXPANSION_CONST_SIZE;
206 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
207 p+=SSL3_RANDOM_SIZE;
208 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
209 p+=SSL3_RANDOM_SIZE;
210
211 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),
212 s->session->master_key,s->session->master_key_length,
213 km,tmp,num);
214#ifdef KSSL_DEBUG
215 printf("tls1_generate_key_block() ==> %d byte master_key =\n\t",
216 s->session->master_key_length);
217 {
218 int i;
219 for (i=0; i < s->session->master_key_length; i++)
220 {
221 printf("%02X", s->session->master_key[i]);
222 }
223 printf("\n"); }
224#endif /* KSSL_DEBUG */
225 }
226
227int tls1_change_cipher_state(SSL *s, int which)
228 {
229 static const unsigned char empty[]="";
230 unsigned char *p,*key_block,*mac_secret;
231 unsigned char *exp_label,buf[TLS_MD_MAX_CONST_SIZE+
232 SSL3_RANDOM_SIZE*2];
233 unsigned char tmp1[EVP_MAX_KEY_LENGTH];
234 unsigned char tmp2[EVP_MAX_KEY_LENGTH];
235 unsigned char iv1[EVP_MAX_IV_LENGTH*2];
236 unsigned char iv2[EVP_MAX_IV_LENGTH*2];
237 unsigned char *ms,*key,*iv,*er1,*er2;
238 int client_write;
239 EVP_CIPHER_CTX *dd;
240 const EVP_CIPHER *c;
241#ifndef OPENSSL_NO_COMP
242 const SSL_COMP *comp;
243#endif
244 const EVP_MD *m;
245 int is_export,n,i,j,k,exp_label_len,cl;
246 int reuse_dd = 0;
247
248 is_export=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
249 c=s->s3->tmp.new_sym_enc;
250 m=s->s3->tmp.new_hash;
251#ifndef OPENSSL_NO_COMP
252 comp=s->s3->tmp.new_compression;
253#endif
254 key_block=s->s3->tmp.key_block;
255
256#ifdef KSSL_DEBUG
257 printf("tls1_change_cipher_state(which= %d) w/\n", which);
258 printf("\talg= %ld, comp= %p\n", s->s3->tmp.new_cipher->algorithms,
259 (void *)comp);
260 printf("\tevp_cipher == %p ==? &d_cbc_ede_cipher3\n", (void *)c);
261 printf("\tevp_cipher: nid, blksz= %d, %d, keylen=%d, ivlen=%d\n",
262 c->nid,c->block_size,c->key_len,c->iv_len);
263 printf("\tkey_block: len= %d, data= ", s->s3->tmp.key_block_length);
264 {
265 int ki;
266 for (ki=0; ki<s->s3->tmp.key_block_length; ki++)
267 printf("%02x", key_block[ki]); printf("\n");
268 }
269#endif /* KSSL_DEBUG */
270
271 if (which & SSL3_CC_READ)
272 {
273 if (s->enc_read_ctx != NULL)
274 reuse_dd = 1;
275 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
276 goto err;
277 else
278 /* make sure it's intialized in case we exit later with an error */
279 EVP_CIPHER_CTX_init(s->enc_read_ctx);
280 dd= s->enc_read_ctx;
281 s->read_hash=m;
282#ifndef OPENSSL_NO_COMP
283 if (s->expand != NULL)
284 {
285 COMP_CTX_free(s->expand);
286 s->expand=NULL;
287 }
288 if (comp != NULL)
289 {
290 s->expand=COMP_CTX_new(comp->method);
291 if (s->expand == NULL)
292 {
293 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
294 goto err2;
295 }
296 if (s->s3->rrec.comp == NULL)
297 s->s3->rrec.comp=(unsigned char *)
298 OPENSSL_malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH);
299 if (s->s3->rrec.comp == NULL)
300 goto err;
301 }
302#endif
303 /* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
304 if (s->version != DTLS1_VERSION)
305 memset(&(s->s3->read_sequence[0]),0,8);
306 mac_secret= &(s->s3->read_mac_secret[0]);
307 }
308 else
309 {
310 if (s->enc_write_ctx != NULL)
311 reuse_dd = 1;
312 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
313 goto err;
314 else
315 /* make sure it's intialized in case we exit later with an error */
316 EVP_CIPHER_CTX_init(s->enc_write_ctx);
317 dd= s->enc_write_ctx;
318 s->write_hash=m;
319#ifndef OPENSSL_NO_COMP
320 if (s->compress != NULL)
321 {
322 COMP_CTX_free(s->compress);
323 s->compress=NULL;
324 }
325 if (comp != NULL)
326 {
327 s->compress=COMP_CTX_new(comp->method);
328 if (s->compress == NULL)
329 {
330 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
331 goto err2;
332 }
333 }
334#endif
335 /* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
336 if (s->version != DTLS1_VERSION)
337 memset(&(s->s3->write_sequence[0]),0,8);
338 mac_secret= &(s->s3->write_mac_secret[0]);
339 }
340
341 if (reuse_dd)
342 EVP_CIPHER_CTX_cleanup(dd);
343
344 p=s->s3->tmp.key_block;
345 i=EVP_MD_size(m);
346 cl=EVP_CIPHER_key_length(c);
347 j=is_export ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
348 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
349 /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
350 k=EVP_CIPHER_iv_length(c);
351 er1= &(s->s3->client_random[0]);
352 er2= &(s->s3->server_random[0]);
353 if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
354 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
355 {
356 ms= &(p[ 0]); n=i+i;
357 key= &(p[ n]); n+=j+j;
358 iv= &(p[ n]); n+=k+k;
359 exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST;
360 exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE;
361 client_write=1;
362 }
363 else
364 {
365 n=i;
366 ms= &(p[ n]); n+=i+j;
367 key= &(p[ n]); n+=j+k;
368 iv= &(p[ n]); n+=k;
369 exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST;
370 exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE;
371 client_write=0;
372 }
373
374 if (n > s->s3->tmp.key_block_length)
375 {
376 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
377 goto err2;
378 }
379
380 memcpy(mac_secret,ms,i);
381#ifdef TLS_DEBUG
382printf("which = %04X\nmac key=",which);
383{ int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); }
384#endif
385 if (is_export)
386 {
387 /* In here I set both the read and write key/iv to the
388 * same value since only the correct one will be used :-).
389 */
390 p=buf;
391 memcpy(p,exp_label,exp_label_len);
392 p+=exp_label_len;
393 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
394 p+=SSL3_RANDOM_SIZE;
395 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
396 p+=SSL3_RANDOM_SIZE;
397 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),key,j,
398 tmp1,tmp2,EVP_CIPHER_key_length(c));
399 key=tmp1;
400
401 if (k > 0)
402 {
403 p=buf;
404 memcpy(p,TLS_MD_IV_BLOCK_CONST,
405 TLS_MD_IV_BLOCK_CONST_SIZE);
406 p+=TLS_MD_IV_BLOCK_CONST_SIZE;
407 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
408 p+=SSL3_RANDOM_SIZE;
409 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
410 p+=SSL3_RANDOM_SIZE;
411 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,p-buf,empty,0,
412 iv1,iv2,k*2);
413 if (client_write)
414 iv=iv1;
415 else
416 iv= &(iv1[k]);
417 }
418 }
419
420 s->session->key_arg_length=0;
421#ifdef KSSL_DEBUG
422 {
423 int ki;
424 printf("EVP_CipherInit_ex(dd,c,key=,iv=,which)\n");
425 printf("\tkey= ");
426 for (ki=0; ki<c->key_len; ki++) printf("%02x", key[ki]);
427 printf("\n");
428 printf("\t iv= ");
429 for (ki=0; ki<c->iv_len; ki++) printf("%02x", iv[ki]);
430 printf("\n");
431 }
432#endif /* KSSL_DEBUG */
433
434 EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
435#ifdef TLS_DEBUG
436printf("which = %04X\nkey=",which);
437{ int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); }
438printf("\niv=");
439{ int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); }
440printf("\n");
441#endif
442
443 OPENSSL_cleanse(tmp1,sizeof(tmp1));
444 OPENSSL_cleanse(tmp2,sizeof(tmp1));
445 OPENSSL_cleanse(iv1,sizeof(iv1));
446 OPENSSL_cleanse(iv2,sizeof(iv2));
447 return(1);
448err:
449 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
450err2:
451 return(0);
452 }
453
454int tls1_setup_key_block(SSL *s)
455 {
456 unsigned char *p1,*p2;
457 const EVP_CIPHER *c;
458 const EVP_MD *hash;
459 int num;
460 SSL_COMP *comp;
461
462#ifdef KSSL_DEBUG
463 printf ("tls1_setup_key_block()\n");
464#endif /* KSSL_DEBUG */
465
466 if (s->s3->tmp.key_block_length != 0)
467 return(1);
468
469 if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
470 {
471 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
472 return(0);
473 }
474
475 s->s3->tmp.new_sym_enc=c;
476 s->s3->tmp.new_hash=hash;
477
478 num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
479 num*=2;
480
481 ssl3_cleanup_key_block(s);
482
483 if ((p1=(unsigned char *)OPENSSL_malloc(num)) == NULL)
484 goto err;
485 if ((p2=(unsigned char *)OPENSSL_malloc(num)) == NULL)
486 goto err;
487
488 s->s3->tmp.key_block_length=num;
489 s->s3->tmp.key_block=p1;
490
491
492#ifdef TLS_DEBUG
493printf("client random\n");
494{ int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); }
495printf("server random\n");
496{ int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); }
497printf("pre-master\n");
498{ int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); }
499#endif
500 tls1_generate_key_block(s,p1,p2,num);
501 OPENSSL_cleanse(p2,num);
502 OPENSSL_free(p2);
503#ifdef TLS_DEBUG
504printf("\nkey block\n");
505{ int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); }
506#endif
507
508 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
509 {
510 /* enable vulnerability countermeasure for CBC ciphers with
511 * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
512 */
513 s->s3->need_empty_fragments = 1;
514
515 if (s->session->cipher != NULL)
516 {
517 if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL)
518 s->s3->need_empty_fragments = 0;
519
520#ifndef OPENSSL_NO_RC4
521 if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4)
522 s->s3->need_empty_fragments = 0;
523#endif
524 }
525 }
526
527 return(1);
528err:
529 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
530 return(0);
531 }
532
533int tls1_enc(SSL *s, int send)
534 {
535 SSL3_RECORD *rec;
536 EVP_CIPHER_CTX *ds;
537 unsigned long l;
538 int bs,i,ii,j,k,n=0;
539 const EVP_CIPHER *enc;
540
541 if (send)
542 {
543 if (s->write_hash != NULL)
544 n=EVP_MD_size(s->write_hash);
545 ds=s->enc_write_ctx;
546 rec= &(s->s3->wrec);
547 if (s->enc_write_ctx == NULL)
548 enc=NULL;
549 else
550 enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
551 }
552 else
553 {
554 if (s->read_hash != NULL)
555 n=EVP_MD_size(s->read_hash);
556 ds=s->enc_read_ctx;
557 rec= &(s->s3->rrec);
558 if (s->enc_read_ctx == NULL)
559 enc=NULL;
560 else
561 enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
562 }
563
564#ifdef KSSL_DEBUG
565 printf("tls1_enc(%d)\n", send);
566#endif /* KSSL_DEBUG */
567
568 if ((s->session == NULL) || (ds == NULL) ||
569 (enc == NULL))
570 {
571 memmove(rec->data,rec->input,rec->length);
572 rec->input=rec->data;
573 }
574 else
575 {
576 l=rec->length;
577 bs=EVP_CIPHER_block_size(ds->cipher);
578
579 if ((bs != 1) && send)
580 {
581 i=bs-((int)l%bs);
582
583 /* Add weird padding of upto 256 bytes */
584
585 /* we need to add 'i' padding bytes of value j */
586 j=i-1;
587 if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG)
588 {
589 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
590 j++;
591 }
592 for (k=(int)l; k<(int)(l+i); k++)
593 rec->input[k]=j;
594 l+=i;
595 rec->length+=i;
596 }
597
598#ifdef KSSL_DEBUG
599 {
600 unsigned long ui;
601 printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n",
602 (void *)ds,rec->data,rec->input,l);
603 printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%ld %ld], %d iv_len\n",
604 ds->buf_len, ds->cipher->key_len,
605 (unsigned long)DES_KEY_SZ,
606 (unsigned long)DES_SCHEDULE_SZ,
607 ds->cipher->iv_len);
608 printf("\t\tIV: ");
609 for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]);
610 printf("\n");
611 printf("\trec->input=");
612 for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]);
613 printf("\n");
614 }
615#endif /* KSSL_DEBUG */
616
617 if (!send)
618 {
619 if (l == 0 || l%bs != 0)
620 {
621 SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
622 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
623 return 0;
624 }
625 }
626
627 EVP_Cipher(ds,rec->data,rec->input,l);
628
629#ifdef KSSL_DEBUG
630 {
631 unsigned long ki;
632 printf("\trec->data=");
633 for (ki=0; ki<l; i++)
634 printf(" %02x", rec->data[ki]); printf("\n");
635 }
636#endif /* KSSL_DEBUG */
637
638 if ((bs != 1) && !send)
639 {
640 ii=i=rec->data[l-1]; /* padding_length */
641 i++;
642 /* NB: if compression is in operation the first packet
643 * may not be of even length so the padding bug check
644 * cannot be performed. This bug workaround has been
645 * around since SSLeay so hopefully it is either fixed
646 * now or no buggy implementation supports compression
647 * [steve]
648 */
649 if ( (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG)
650 && !s->expand)
651 {
652 /* First packet is even in size, so check */
653 if ((memcmp(s->s3->read_sequence,
654 "\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1))
655 s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG;
656 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
657 i--;
658 }
659 /* TLS 1.0 does not bound the number of padding bytes by the block size.
660 * All of them must have value 'padding_length'. */
661 if (i > (int)rec->length)
662 {
663 /* Incorrect padding. SSLerr() and ssl3_alert are done
664 * by caller: we don't want to reveal whether this is
665 * a decryption error or a MAC verification failure
666 * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
667 return -1;
668 }
669 for (j=(int)(l-i); j<(int)l; j++)
670 {
671 if (rec->data[j] != ii)
672 {
673 /* Incorrect padding */
674 return -1;
675 }
676 }
677 rec->length-=i;
678 }
679 }
680 return(1);
681 }
682
683int tls1_cert_verify_mac(SSL *s, EVP_MD_CTX *in_ctx, unsigned char *out)
684 {
685 unsigned int ret;
686 EVP_MD_CTX ctx;
687
688 EVP_MD_CTX_init(&ctx);
689 EVP_MD_CTX_copy_ex(&ctx,in_ctx);
690 EVP_DigestFinal_ex(&ctx,out,&ret);
691 EVP_MD_CTX_cleanup(&ctx);
692 return((int)ret);
693 }
694
695int tls1_final_finish_mac(SSL *s, EVP_MD_CTX *in1_ctx, EVP_MD_CTX *in2_ctx,
696 const char *str, int slen, unsigned char *out)
697 {
698 unsigned int i;
699 EVP_MD_CTX ctx;
700 unsigned char buf[TLS_MD_MAX_CONST_SIZE+MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
701 unsigned char *q,buf2[12];
702
703 q=buf;
704 memcpy(q,str,slen);
705 q+=slen;
706
707 EVP_MD_CTX_init(&ctx);
708 EVP_MD_CTX_copy_ex(&ctx,in1_ctx);
709 EVP_DigestFinal_ex(&ctx,q,&i);
710 q+=i;
711 EVP_MD_CTX_copy_ex(&ctx,in2_ctx);
712 EVP_DigestFinal_ex(&ctx,q,&i);
713 q+=i;
714
715 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(q-buf),
716 s->session->master_key,s->session->master_key_length,
717 out,buf2,sizeof buf2);
718 EVP_MD_CTX_cleanup(&ctx);
719
720 return sizeof buf2;
721 }
722
723int tls1_mac(SSL *ssl, unsigned char *md, int send)
724 {
725 SSL3_RECORD *rec;
726 unsigned char *mac_sec,*seq;
727 const EVP_MD *hash;
728 unsigned int md_size;
729 int i;
730 HMAC_CTX hmac;
731 unsigned char buf[5];
732
733 if (send)
734 {
735 rec= &(ssl->s3->wrec);
736 mac_sec= &(ssl->s3->write_mac_secret[0]);
737 seq= &(ssl->s3->write_sequence[0]);
738 hash=ssl->write_hash;
739 }
740 else
741 {
742 rec= &(ssl->s3->rrec);
743 mac_sec= &(ssl->s3->read_mac_secret[0]);
744 seq= &(ssl->s3->read_sequence[0]);
745 hash=ssl->read_hash;
746 }
747
748 md_size=EVP_MD_size(hash);
749
750 buf[0]=rec->type;
751 if (ssl->version == DTLS1_VERSION && ssl->client_version == DTLS1_BAD_VER)
752 {
753 buf[1]=TLS1_VERSION_MAJOR;
754 buf[2]=TLS1_VERSION_MINOR;
755 }
756 else {
757 buf[1]=(unsigned char)(ssl->version>>8);
758 buf[2]=(unsigned char)(ssl->version);
759 }
760
761 buf[3]=rec->length>>8;
762 buf[4]=rec->length&0xff;
763
764 /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */
765 HMAC_CTX_init(&hmac);
766 HMAC_Init_ex(&hmac,mac_sec,EVP_MD_size(hash),hash,NULL);
767
768 if (ssl->version == DTLS1_VERSION && ssl->client_version != DTLS1_BAD_VER)
769 {
770 unsigned char dtlsseq[8],*p=dtlsseq;
771
772 s2n(send?ssl->d1->w_epoch:ssl->d1->r_epoch, p);
773 memcpy (p,&seq[2],6);
774
775 HMAC_Update(&hmac,dtlsseq,8);
776 }
777 else
778 HMAC_Update(&hmac,seq,8);
779
780 HMAC_Update(&hmac,buf,5);
781 HMAC_Update(&hmac,rec->input,rec->length);
782 HMAC_Final(&hmac,md,&md_size);
783 HMAC_CTX_cleanup(&hmac);
784
785#ifdef TLS_DEBUG
786printf("sec=");
787{unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); }
788printf("seq=");
789{int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); }
790printf("buf=");
791{int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); }
792printf("rec=");
793{unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); }
794#endif
795
796 if ( SSL_version(ssl) != DTLS1_VERSION)
797 {
798 for (i=7; i>=0; i--)
799 {
800 ++seq[i];
801 if (seq[i] != 0) break;
802 }
803 }
804
805#ifdef TLS_DEBUG
806{unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); }
807#endif
808 return(md_size);
809 }
810
811int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
812 int len)
813 {
814 unsigned char buf[SSL3_RANDOM_SIZE*2+TLS_MD_MASTER_SECRET_CONST_SIZE];
815 unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH];
816
817#ifdef KSSL_DEBUG
818 printf ("tls1_generate_master_secret(%p,%p, %p, %d)\n", (void *)s,out, p,len);
819#endif /* KSSL_DEBUG */
820
821 /* Setup the stuff to munge */
822 memcpy(buf,TLS_MD_MASTER_SECRET_CONST,
823 TLS_MD_MASTER_SECRET_CONST_SIZE);
824 memcpy(&(buf[TLS_MD_MASTER_SECRET_CONST_SIZE]),
825 s->s3->client_random,SSL3_RANDOM_SIZE);
826 memcpy(&(buf[SSL3_RANDOM_SIZE+TLS_MD_MASTER_SECRET_CONST_SIZE]),
827 s->s3->server_random,SSL3_RANDOM_SIZE);
828 tls1_PRF(s->ctx->md5,s->ctx->sha1,
829 buf,TLS_MD_MASTER_SECRET_CONST_SIZE+SSL3_RANDOM_SIZE*2,p,len,
830 s->session->master_key,buff,sizeof buff);
831#ifdef KSSL_DEBUG
832 printf ("tls1_generate_master_secret() complete\n");
833#endif /* KSSL_DEBUG */
834 return(SSL3_MASTER_SECRET_SIZE);
835 }
836
837int tls1_alert_code(int code)
838 {
839 switch (code)
840 {
841 case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY);
842 case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
843 case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC);
844 case SSL_AD_DECRYPTION_FAILED: return(TLS1_AD_DECRYPTION_FAILED);
845 case SSL_AD_RECORD_OVERFLOW: return(TLS1_AD_RECORD_OVERFLOW);
846 case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
847 case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE);
848 case SSL_AD_NO_CERTIFICATE: return(-1);
849 case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE);
850 case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
851 case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
852 case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
853 case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
854 case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER);
855 case SSL_AD_UNKNOWN_CA: return(TLS1_AD_UNKNOWN_CA);
856 case SSL_AD_ACCESS_DENIED: return(TLS1_AD_ACCESS_DENIED);
857 case SSL_AD_DECODE_ERROR: return(TLS1_AD_DECODE_ERROR);
858 case SSL_AD_DECRYPT_ERROR: return(TLS1_AD_DECRYPT_ERROR);
859 case SSL_AD_EXPORT_RESTRICTION: return(TLS1_AD_EXPORT_RESTRICTION);
860 case SSL_AD_PROTOCOL_VERSION: return(TLS1_AD_PROTOCOL_VERSION);
861 case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY);
862 case SSL_AD_INTERNAL_ERROR: return(TLS1_AD_INTERNAL_ERROR);
863 case SSL_AD_USER_CANCELLED: return(TLS1_AD_USER_CANCELLED);
864 case SSL_AD_NO_RENEGOTIATION: return(TLS1_AD_NO_RENEGOTIATION);
865#ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
866 case DTLS1_AD_MISSING_HANDSHAKE_MESSAGE: return
867 (DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
868#endif
869 default: return(-1);
870 }
871 }
872
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-04-27 05:54:27 +0000