Import OpenSSL-1.0.0f.
[dragonfly.git] / crypto / openssl / ssl / s3_enc.c
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) 1998-2007 The OpenSSL Project.  All rights reserved.
60  *
61  * Redistribution and use in source and binary forms, with or without
62  * modification, are permitted provided that the following conditions
63  * are met:
64  *
65  * 1. Redistributions of source code must retain the above copyright
66  *    notice, this list of conditions and the following disclaimer. 
67  *
68  * 2. Redistributions in binary form must reproduce the above copyright
69  *    notice, this list of conditions and the following disclaimer in
70  *    the documentation and/or other materials provided with the
71  *    distribution.
72  *
73  * 3. All advertising materials mentioning features or use of this
74  *    software must display the following acknowledgment:
75  *    "This product includes software developed by the OpenSSL Project
76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77  *
78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79  *    endorse or promote products derived from this software without
80  *    prior written permission. For written permission, please contact
81  *    openssl-core@openssl.org.
82  *
83  * 5. Products derived from this software may not be called "OpenSSL"
84  *    nor may "OpenSSL" appear in their names without prior written
85  *    permission of the OpenSSL Project.
86  *
87  * 6. Redistributions of any form whatsoever must retain the following
88  *    acknowledgment:
89  *    "This product includes software developed by the OpenSSL Project
90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91  *
92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103  * OF THE POSSIBILITY OF SUCH DAMAGE.
104  * ====================================================================
105  *
106  * This product includes cryptographic software written by Eric Young
107  * (eay@cryptsoft.com).  This product includes software written by Tim
108  * Hudson (tjh@cryptsoft.com).
109  *
110  */
111 /* ====================================================================
112  * Copyright 2005 Nokia. All rights reserved.
113  *
114  * The portions of the attached software ("Contribution") is developed by
115  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
116  * license.
117  *
118  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
119  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
120  * support (see RFC 4279) to OpenSSL.
121  *
122  * No patent licenses or other rights except those expressly stated in
123  * the OpenSSL open source license shall be deemed granted or received
124  * expressly, by implication, estoppel, or otherwise.
125  *
126  * No assurances are provided by Nokia that the Contribution does not
127  * infringe the patent or other intellectual property rights of any third
128  * party or that the license provides you with all the necessary rights
129  * to make use of the Contribution.
130  *
131  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
132  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
133  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
134  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
135  * OTHERWISE.
136  */
137
138 #include <stdio.h>
139 #include "ssl_locl.h"
140 #include <openssl/evp.h>
141 #include <openssl/md5.h>
142
143 static unsigned char ssl3_pad_1[48]={
144         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
145         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
146         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
147         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
148         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
149         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36 };
150
151 static unsigned char ssl3_pad_2[48]={
152         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
153         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
154         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
155         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
156         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
157         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c };
158 static int ssl3_handshake_mac(SSL *s, int md_nid,
159         const char *sender, int len, unsigned char *p);
160 static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num)
161         {
162         EVP_MD_CTX m5;
163         EVP_MD_CTX s1;
164         unsigned char buf[16],smd[SHA_DIGEST_LENGTH];
165         unsigned char c='A';
166         unsigned int i,j,k;
167
168 #ifdef CHARSET_EBCDIC
169         c = os_toascii[c]; /*'A' in ASCII */
170 #endif
171         k=0;
172         EVP_MD_CTX_init(&m5);
173         EVP_MD_CTX_init(&s1);
174         for (i=0; (int)i<num; i+=MD5_DIGEST_LENGTH)
175                 {
176                 k++;
177                 if (k > sizeof buf)
178                         {
179                         /* bug: 'buf' is too small for this ciphersuite */
180                         SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);
181                         return 0;
182                         }
183                 
184                 for (j=0; j<k; j++)
185                         buf[j]=c;
186                 c++;
187                 EVP_DigestInit_ex(&s1,EVP_sha1(), NULL);
188                 EVP_DigestUpdate(&s1,buf,k);
189                 EVP_DigestUpdate(&s1,s->session->master_key,
190                         s->session->master_key_length);
191                 EVP_DigestUpdate(&s1,s->s3->server_random,SSL3_RANDOM_SIZE);
192                 EVP_DigestUpdate(&s1,s->s3->client_random,SSL3_RANDOM_SIZE);
193                 EVP_DigestFinal_ex(&s1,smd,NULL);
194
195                 EVP_DigestInit_ex(&m5,EVP_md5(), NULL);
196                 EVP_DigestUpdate(&m5,s->session->master_key,
197                         s->session->master_key_length);
198                 EVP_DigestUpdate(&m5,smd,SHA_DIGEST_LENGTH);
199                 if ((int)(i+MD5_DIGEST_LENGTH) > num)
200                         {
201                         EVP_DigestFinal_ex(&m5,smd,NULL);
202                         memcpy(km,smd,(num-i));
203                         }
204                 else
205                         EVP_DigestFinal_ex(&m5,km,NULL);
206
207                 km+=MD5_DIGEST_LENGTH;
208                 }
209         OPENSSL_cleanse(smd,SHA_DIGEST_LENGTH);
210         EVP_MD_CTX_cleanup(&m5);
211         EVP_MD_CTX_cleanup(&s1);
212         return 1;
213         }
214
215 int ssl3_change_cipher_state(SSL *s, int which)
216         {
217         unsigned char *p,*mac_secret;
218         unsigned char exp_key[EVP_MAX_KEY_LENGTH];
219         unsigned char exp_iv[EVP_MAX_IV_LENGTH];
220         unsigned char *ms,*key,*iv,*er1,*er2;
221         EVP_CIPHER_CTX *dd;
222         const EVP_CIPHER *c;
223 #ifndef OPENSSL_NO_COMP
224         COMP_METHOD *comp;
225 #endif
226         const EVP_MD *m;
227         EVP_MD_CTX md;
228         int is_exp,n,i,j,k,cl;
229         int reuse_dd = 0;
230
231         is_exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
232         c=s->s3->tmp.new_sym_enc;
233         m=s->s3->tmp.new_hash;
234         /* m == NULL will lead to a crash later */
235         OPENSSL_assert(m);
236 #ifndef OPENSSL_NO_COMP
237         if (s->s3->tmp.new_compression == NULL)
238                 comp=NULL;
239         else
240                 comp=s->s3->tmp.new_compression->method;
241 #endif
242
243         if (which & SSL3_CC_READ)
244                 {
245                 if (s->enc_read_ctx != NULL)
246                         reuse_dd = 1;
247                 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
248                         goto err;
249                 else
250                         /* make sure it's intialized in case we exit later with an error */
251                         EVP_CIPHER_CTX_init(s->enc_read_ctx);
252                 dd= s->enc_read_ctx;
253
254                 ssl_replace_hash(&s->read_hash,m);
255 #ifndef OPENSSL_NO_COMP
256                 /* COMPRESS */
257                 if (s->expand != NULL)
258                         {
259                         COMP_CTX_free(s->expand);
260                         s->expand=NULL;
261                         }
262                 if (comp != NULL)
263                         {
264                         s->expand=COMP_CTX_new(comp);
265                         if (s->expand == NULL)
266                                 {
267                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
268                                 goto err2;
269                                 }
270                         if (s->s3->rrec.comp == NULL)
271                                 s->s3->rrec.comp=(unsigned char *)
272                                         OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);
273                         if (s->s3->rrec.comp == NULL)
274                                 goto err;
275                         }
276 #endif
277                 memset(&(s->s3->read_sequence[0]),0,8);
278                 mac_secret= &(s->s3->read_mac_secret[0]);
279                 }
280         else
281                 {
282                 if (s->enc_write_ctx != NULL)
283                         reuse_dd = 1;
284                 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
285                         goto err;
286                 else
287                         /* make sure it's intialized in case we exit later with an error */
288                         EVP_CIPHER_CTX_init(s->enc_write_ctx);
289                 dd= s->enc_write_ctx;
290                 ssl_replace_hash(&s->write_hash,m);
291 #ifndef OPENSSL_NO_COMP
292                 /* COMPRESS */
293                 if (s->compress != NULL)
294                         {
295                         COMP_CTX_free(s->compress);
296                         s->compress=NULL;
297                         }
298                 if (comp != NULL)
299                         {
300                         s->compress=COMP_CTX_new(comp);
301                         if (s->compress == NULL)
302                                 {
303                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
304                                 goto err2;
305                                 }
306                         }
307 #endif
308                 memset(&(s->s3->write_sequence[0]),0,8);
309                 mac_secret= &(s->s3->write_mac_secret[0]);
310                 }
311
312         if (reuse_dd)
313                 EVP_CIPHER_CTX_cleanup(dd);
314
315         p=s->s3->tmp.key_block;
316         i=EVP_MD_size(m);
317         if (i < 0)
318                 goto err2;
319         cl=EVP_CIPHER_key_length(c);
320         j=is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
321                  cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
322         /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */
323         k=EVP_CIPHER_iv_length(c);
324         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
325                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
326                 {
327                 ms=  &(p[ 0]); n=i+i;
328                 key= &(p[ n]); n+=j+j;
329                 iv=  &(p[ n]); n+=k+k;
330                 er1= &(s->s3->client_random[0]);
331                 er2= &(s->s3->server_random[0]);
332                 }
333         else
334                 {
335                 n=i;
336                 ms=  &(p[ n]); n+=i+j;
337                 key= &(p[ n]); n+=j+k;
338                 iv=  &(p[ n]); n+=k;
339                 er1= &(s->s3->server_random[0]);
340                 er2= &(s->s3->client_random[0]);
341                 }
342
343         if (n > s->s3->tmp.key_block_length)
344                 {
345                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
346                 goto err2;
347                 }
348
349         EVP_MD_CTX_init(&md);
350         memcpy(mac_secret,ms,i);
351         if (is_exp)
352                 {
353                 /* In here I set both the read and write key/iv to the
354                  * same value since only the correct one will be used :-).
355                  */
356                 EVP_DigestInit_ex(&md,EVP_md5(), NULL);
357                 EVP_DigestUpdate(&md,key,j);
358                 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
359                 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
360                 EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL);
361                 key= &(exp_key[0]);
362
363                 if (k > 0)
364                         {
365                         EVP_DigestInit_ex(&md,EVP_md5(), NULL);
366                         EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
367                         EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
368                         EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL);
369                         iv= &(exp_iv[0]);
370                         }
371                 }
372
373         s->session->key_arg_length=0;
374
375         EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
376
377         OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key));
378         OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv));
379         EVP_MD_CTX_cleanup(&md);
380         return(1);
381 err:
382         SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
383 err2:
384         return(0);
385         }
386
387 int ssl3_setup_key_block(SSL *s)
388         {
389         unsigned char *p;
390         const EVP_CIPHER *c;
391         const EVP_MD *hash;
392         int num;
393         int ret = 0;
394         SSL_COMP *comp;
395
396         if (s->s3->tmp.key_block_length != 0)
397                 return(1);
398
399         if (!ssl_cipher_get_evp(s->session,&c,&hash,NULL,NULL,&comp))
400                 {
401                 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
402                 return(0);
403                 }
404
405         s->s3->tmp.new_sym_enc=c;
406         s->s3->tmp.new_hash=hash;
407 #ifdef OPENSSL_NO_COMP
408         s->s3->tmp.new_compression=NULL;
409 #else
410         s->s3->tmp.new_compression=comp;
411 #endif
412
413         num=EVP_MD_size(hash);
414         if (num < 0)
415                 return 0;
416
417         num=EVP_CIPHER_key_length(c)+num+EVP_CIPHER_iv_length(c);
418         num*=2;
419
420         ssl3_cleanup_key_block(s);
421
422         if ((p=OPENSSL_malloc(num)) == NULL)
423                 goto err;
424
425         s->s3->tmp.key_block_length=num;
426         s->s3->tmp.key_block=p;
427
428         ret = ssl3_generate_key_block(s,p,num);
429
430         if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
431                 {
432                 /* enable vulnerability countermeasure for CBC ciphers with
433                  * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
434                  */
435                 s->s3->need_empty_fragments = 1;
436
437                 if (s->session->cipher != NULL)
438                         {
439                         if (s->session->cipher->algorithm_enc == SSL_eNULL)
440                                 s->s3->need_empty_fragments = 0;
441                         
442 #ifndef OPENSSL_NO_RC4
443                         if (s->session->cipher->algorithm_enc == SSL_RC4)
444                                 s->s3->need_empty_fragments = 0;
445 #endif
446                         }
447                 }
448
449         return ret;
450                 
451 err:
452         SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
453         return(0);
454         }
455
456 void ssl3_cleanup_key_block(SSL *s)
457         {
458         if (s->s3->tmp.key_block != NULL)
459                 {
460                 OPENSSL_cleanse(s->s3->tmp.key_block,
461                         s->s3->tmp.key_block_length);
462                 OPENSSL_free(s->s3->tmp.key_block);
463                 s->s3->tmp.key_block=NULL;
464                 }
465         s->s3->tmp.key_block_length=0;
466         }
467
468 int ssl3_enc(SSL *s, int send)
469         {
470         SSL3_RECORD *rec;
471         EVP_CIPHER_CTX *ds;
472         unsigned long l;
473         int bs,i;
474         const EVP_CIPHER *enc;
475
476         if (send)
477                 {
478                 ds=s->enc_write_ctx;
479                 rec= &(s->s3->wrec);
480                 if (s->enc_write_ctx == NULL)
481                         enc=NULL;
482                 else
483                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
484                 }
485         else
486                 {
487                 ds=s->enc_read_ctx;
488                 rec= &(s->s3->rrec);
489                 if (s->enc_read_ctx == NULL)
490                         enc=NULL;
491                 else
492                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
493                 }
494
495         if ((s->session == NULL) || (ds == NULL) ||
496                 (enc == NULL))
497                 {
498                 memmove(rec->data,rec->input,rec->length);
499                 rec->input=rec->data;
500                 }
501         else
502                 {
503                 l=rec->length;
504                 bs=EVP_CIPHER_block_size(ds->cipher);
505
506                 /* COMPRESS */
507
508                 if ((bs != 1) && send)
509                         {
510                         i=bs-((int)l%bs);
511
512                         /* we need to add 'i-1' padding bytes */
513                         l+=i;
514                         /* the last of these zero bytes will be overwritten
515                          * with the padding length. */
516                         memset(&rec->input[rec->length], 0, i);
517                         rec->length+=i;
518                         rec->input[l-1]=(i-1);
519                         }
520                 
521                 if (!send)
522                         {
523                         if (l == 0 || l%bs != 0)
524                                 {
525                                 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
526                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
527                                 return 0;
528                                 }
529                         /* otherwise, rec->length >= bs */
530                         }
531                 
532                 EVP_Cipher(ds,rec->data,rec->input,l);
533
534                 if ((bs != 1) && !send)
535                         {
536                         i=rec->data[l-1]+1;
537                         /* SSL 3.0 bounds the number of padding bytes by the block size;
538                          * padding bytes (except the last one) are arbitrary */
539                         if (i > bs)
540                                 {
541                                 /* Incorrect padding. SSLerr() and ssl3_alert are done
542                                  * by caller: we don't want to reveal whether this is
543                                  * a decryption error or a MAC verification failure
544                                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
545                                 return -1;
546                                 }
547                         /* now i <= bs <= rec->length */
548                         rec->length-=i;
549                         }
550                 }
551         return(1);
552         }
553
554 void ssl3_init_finished_mac(SSL *s)
555         {
556         if (s->s3->handshake_buffer) BIO_free(s->s3->handshake_buffer);
557         if (s->s3->handshake_dgst) ssl3_free_digest_list(s);
558     s->s3->handshake_buffer=BIO_new(BIO_s_mem());       
559         (void)BIO_set_close(s->s3->handshake_buffer,BIO_CLOSE);
560         }
561
562 void ssl3_free_digest_list(SSL *s) 
563         {
564         int i;
565         if (!s->s3->handshake_dgst) return;
566         for (i=0;i<SSL_MAX_DIGEST;i++) 
567                 {
568                 if (s->s3->handshake_dgst[i])
569                         EVP_MD_CTX_destroy(s->s3->handshake_dgst[i]);
570                 }
571         OPENSSL_free(s->s3->handshake_dgst);
572         s->s3->handshake_dgst=NULL;
573         }       
574                 
575
576
577 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
578         {
579         if (s->s3->handshake_buffer) 
580                 {
581                 BIO_write (s->s3->handshake_buffer,(void *)buf,len);
582                 } 
583         else 
584                 {
585                 int i;
586                 for (i=0;i< SSL_MAX_DIGEST;i++) 
587                         {
588                         if (s->s3->handshake_dgst[i]!= NULL)
589                         EVP_DigestUpdate(s->s3->handshake_dgst[i],buf,len);
590                         }
591                 }       
592         }
593
594 int ssl3_digest_cached_records(SSL *s)
595         {
596         int i;
597         long mask;
598         const EVP_MD *md;
599         long hdatalen;
600         void *hdata;
601
602         /* Allocate handshake_dgst array */
603         ssl3_free_digest_list(s);
604         s->s3->handshake_dgst = OPENSSL_malloc(SSL_MAX_DIGEST * sizeof(EVP_MD_CTX *));
605         memset(s->s3->handshake_dgst,0,SSL_MAX_DIGEST *sizeof(EVP_MD_CTX *));
606         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,&hdata);
607         if (hdatalen <= 0)
608                 {
609                 SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, SSL_R_BAD_HANDSHAKE_LENGTH);
610                 return 0;
611                 }
612
613         /* Loop through bitso of algorithm2 field and create MD_CTX-es */
614         for (i=0;ssl_get_handshake_digest(i,&mask,&md); i++) 
615                 {
616                 if ((mask & s->s3->tmp.new_cipher->algorithm2) && md) 
617                         {
618                         s->s3->handshake_dgst[i]=EVP_MD_CTX_create();
619                         EVP_DigestInit_ex(s->s3->handshake_dgst[i],md,NULL);
620                         EVP_DigestUpdate(s->s3->handshake_dgst[i],hdata,hdatalen);
621                         } 
622                 else 
623                         {       
624                         s->s3->handshake_dgst[i]=NULL;
625                         }
626                 }
627         /* Free handshake_buffer BIO */
628         BIO_free(s->s3->handshake_buffer);
629         s->s3->handshake_buffer = NULL;
630
631         return 1;
632         }
633
634 int ssl3_cert_verify_mac(SSL *s, int md_nid, unsigned char *p)
635         {
636         return(ssl3_handshake_mac(s,md_nid,NULL,0,p));
637         }
638 int ssl3_final_finish_mac(SSL *s, 
639              const char *sender, int len, unsigned char *p)
640         {
641         int ret;
642         ret=ssl3_handshake_mac(s,NID_md5,sender,len,p);
643         p+=ret;
644         ret+=ssl3_handshake_mac(s,NID_sha1,sender,len,p);
645         return(ret);
646         }
647 static int ssl3_handshake_mac(SSL *s, int md_nid,
648              const char *sender, int len, unsigned char *p)
649         {
650         unsigned int ret;
651         int npad,n;
652         unsigned int i;
653         unsigned char md_buf[EVP_MAX_MD_SIZE];
654         EVP_MD_CTX ctx,*d=NULL;
655
656         if (s->s3->handshake_buffer) 
657                 if (!ssl3_digest_cached_records(s))
658                         return 0;
659
660         /* Search for digest of specified type in the handshake_dgst
661          * array*/
662         for (i=0;i<SSL_MAX_DIGEST;i++) 
663                 {
664                   if (s->s3->handshake_dgst[i]&&EVP_MD_CTX_type(s->s3->handshake_dgst[i])==md_nid) 
665                         {
666                         d=s->s3->handshake_dgst[i];
667                         break;
668                         }
669                 }
670         if (!d) {
671                 SSLerr(SSL_F_SSL3_HANDSHAKE_MAC,SSL_R_NO_REQUIRED_DIGEST);
672                 return 0;
673         }       
674         EVP_MD_CTX_init(&ctx);
675         EVP_MD_CTX_copy_ex(&ctx,d);
676         n=EVP_MD_CTX_size(&ctx);
677         if (n < 0)
678                 return 0;
679
680         npad=(48/n)*n;
681         if (sender != NULL)
682                 EVP_DigestUpdate(&ctx,sender,len);
683         EVP_DigestUpdate(&ctx,s->session->master_key,
684                 s->session->master_key_length);
685         EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
686         EVP_DigestFinal_ex(&ctx,md_buf,&i);
687
688         EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL);
689         EVP_DigestUpdate(&ctx,s->session->master_key,
690                 s->session->master_key_length);
691         EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
692         EVP_DigestUpdate(&ctx,md_buf,i);
693         EVP_DigestFinal_ex(&ctx,p,&ret);
694
695         EVP_MD_CTX_cleanup(&ctx);
696
697         return((int)ret);
698         }
699
700 int n_ssl3_mac(SSL *ssl, unsigned char *md, int send)
701         {
702         SSL3_RECORD *rec;
703         unsigned char *mac_sec,*seq;
704         EVP_MD_CTX md_ctx;
705         const EVP_MD_CTX *hash;
706         unsigned char *p,rec_char;
707         unsigned int md_size;
708         int npad;
709         int t;
710
711         if (send)
712                 {
713                 rec= &(ssl->s3->wrec);
714                 mac_sec= &(ssl->s3->write_mac_secret[0]);
715                 seq= &(ssl->s3->write_sequence[0]);
716                 hash=ssl->write_hash;
717                 }
718         else
719                 {
720                 rec= &(ssl->s3->rrec);
721                 mac_sec= &(ssl->s3->read_mac_secret[0]);
722                 seq= &(ssl->s3->read_sequence[0]);
723                 hash=ssl->read_hash;
724                 }
725
726         t=EVP_MD_CTX_size(hash);
727         if (t < 0)
728                 return -1;
729         md_size=t;
730         npad=(48/md_size)*md_size;
731
732         /* Chop the digest off the end :-) */
733         EVP_MD_CTX_init(&md_ctx);
734
735         EVP_MD_CTX_copy_ex( &md_ctx,hash);
736         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
737         EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
738         EVP_DigestUpdate(&md_ctx,seq,8);
739         rec_char=rec->type;
740         EVP_DigestUpdate(&md_ctx,&rec_char,1);
741         p=md;
742         s2n(rec->length,p);
743         EVP_DigestUpdate(&md_ctx,md,2);
744         EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
745         EVP_DigestFinal_ex( &md_ctx,md,NULL);
746
747         EVP_MD_CTX_copy_ex( &md_ctx,hash);
748         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
749         EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
750         EVP_DigestUpdate(&md_ctx,md,md_size);
751         EVP_DigestFinal_ex( &md_ctx,md,&md_size);
752
753         EVP_MD_CTX_cleanup(&md_ctx);
754
755         ssl3_record_sequence_update(seq);
756         return(md_size);
757         }
758
759 void ssl3_record_sequence_update(unsigned char *seq)
760         {
761         int i;
762
763         for (i=7; i>=0; i--)
764                 {
765                 ++seq[i];
766                 if (seq[i] != 0) break; 
767                 }
768         }
769
770 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
771              int len)
772         {
773         static const unsigned char *salt[3]={
774 #ifndef CHARSET_EBCDIC
775                 (const unsigned char *)"A",
776                 (const unsigned char *)"BB",
777                 (const unsigned char *)"CCC",
778 #else
779                 (const unsigned char *)"\x41",
780                 (const unsigned char *)"\x42\x42",
781                 (const unsigned char *)"\x43\x43\x43",
782 #endif
783                 };
784         unsigned char buf[EVP_MAX_MD_SIZE];
785         EVP_MD_CTX ctx;
786         int i,ret=0;
787         unsigned int n;
788
789         EVP_MD_CTX_init(&ctx);
790         for (i=0; i<3; i++)
791                 {
792                 EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL);
793                 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
794                 EVP_DigestUpdate(&ctx,p,len);
795                 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
796                         SSL3_RANDOM_SIZE);
797                 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
798                         SSL3_RANDOM_SIZE);
799                 EVP_DigestFinal_ex(&ctx,buf,&n);
800
801                 EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL);
802                 EVP_DigestUpdate(&ctx,p,len);
803                 EVP_DigestUpdate(&ctx,buf,n);
804                 EVP_DigestFinal_ex(&ctx,out,&n);
805                 out+=n;
806                 ret+=n;
807                 }
808         EVP_MD_CTX_cleanup(&ctx);
809         return(ret);
810         }
811
812 int ssl3_alert_code(int code)
813         {
814         switch (code)
815                 {
816         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
817         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
818         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
819         case SSL_AD_DECRYPTION_FAILED:  return(SSL3_AD_BAD_RECORD_MAC);
820         case SSL_AD_RECORD_OVERFLOW:    return(SSL3_AD_BAD_RECORD_MAC);
821         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
822         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
823         case SSL_AD_NO_CERTIFICATE:     return(SSL3_AD_NO_CERTIFICATE);
824         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
825         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
826         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
827         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
828         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
829         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
830         case SSL_AD_UNKNOWN_CA:         return(SSL3_AD_BAD_CERTIFICATE);
831         case SSL_AD_ACCESS_DENIED:      return(SSL3_AD_HANDSHAKE_FAILURE);
832         case SSL_AD_DECODE_ERROR:       return(SSL3_AD_HANDSHAKE_FAILURE);
833         case SSL_AD_DECRYPT_ERROR:      return(SSL3_AD_HANDSHAKE_FAILURE);
834         case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE);
835         case SSL_AD_PROTOCOL_VERSION:   return(SSL3_AD_HANDSHAKE_FAILURE);
836         case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
837         case SSL_AD_INTERNAL_ERROR:     return(SSL3_AD_HANDSHAKE_FAILURE);
838         case SSL_AD_USER_CANCELLED:     return(SSL3_AD_HANDSHAKE_FAILURE);
839         case SSL_AD_NO_RENEGOTIATION:   return(-1); /* Don't send it :-) */
840         case SSL_AD_UNSUPPORTED_EXTENSION: return(SSL3_AD_HANDSHAKE_FAILURE);
841         case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(SSL3_AD_HANDSHAKE_FAILURE);
842         case SSL_AD_UNRECOGNIZED_NAME:  return(SSL3_AD_HANDSHAKE_FAILURE);
843         case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(SSL3_AD_HANDSHAKE_FAILURE);
844         case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(SSL3_AD_HANDSHAKE_FAILURE);
845         case SSL_AD_UNKNOWN_PSK_IDENTITY:return(TLS1_AD_UNKNOWN_PSK_IDENTITY);
846         default:                        return(-1);
847                 }
848         }
849