00fad17b9aa08cd070933e999a5ef4c1cec1bbbb
[openssl.git] / 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,*key_block,*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         key_block=s->s3->tmp.key_block;
243
244         if (which & SSL3_CC_READ)
245                 {
246                 if (s->enc_read_ctx != NULL)
247                         reuse_dd = 1;
248                 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
249                         goto err;
250                 else
251                         /* make sure it's intialized in case we exit later with an error */
252                         EVP_CIPHER_CTX_init(s->enc_read_ctx);
253                 dd= s->enc_read_ctx;
254
255                 ssl_replace_hash(&s->read_hash,m);
256 #ifndef OPENSSL_NO_COMP
257                 /* COMPRESS */
258                 if (s->expand != NULL)
259                         {
260                         COMP_CTX_free(s->expand);
261                         s->expand=NULL;
262                         }
263                 if (comp != NULL)
264                         {
265                         s->expand=COMP_CTX_new(comp);
266                         if (s->expand == NULL)
267                                 {
268                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
269                                 goto err2;
270                                 }
271                         if (s->s3->rrec.comp == NULL)
272                                 s->s3->rrec.comp=(unsigned char *)
273                                         OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);
274                         if (s->s3->rrec.comp == NULL)
275                                 goto err;
276                         }
277 #endif
278                 memset(&(s->s3->read_sequence[0]),0,8);
279                 mac_secret= &(s->s3->read_mac_secret[0]);
280                 }
281         else
282                 {
283                 if (s->enc_write_ctx != NULL)
284                         reuse_dd = 1;
285                 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
286                         goto err;
287                 else
288                         /* make sure it's intialized in case we exit later with an error */
289                         EVP_CIPHER_CTX_init(s->enc_write_ctx);
290                 dd= s->enc_write_ctx;
291                 ssl_replace_hash(&s->write_hash,m);
292 #ifndef OPENSSL_NO_COMP
293                 /* COMPRESS */
294                 if (s->compress != NULL)
295                         {
296                         COMP_CTX_free(s->compress);
297                         s->compress=NULL;
298                         }
299                 if (comp != NULL)
300                         {
301                         s->compress=COMP_CTX_new(comp);
302                         if (s->compress == NULL)
303                                 {
304                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
305                                 goto err2;
306                                 }
307                         }
308 #endif
309                 memset(&(s->s3->write_sequence[0]),0,8);
310                 mac_secret= &(s->s3->write_mac_secret[0]);
311                 }
312
313         if (reuse_dd)
314                 EVP_CIPHER_CTX_cleanup(dd);
315
316         p=s->s3->tmp.key_block;
317         i=EVP_MD_size(m);
318         if (i < 0)
319                 goto err2;
320         cl=EVP_CIPHER_key_length(c);
321         j=is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
322                  cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
323         /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */
324         k=EVP_CIPHER_iv_length(c);
325         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
326                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
327                 {
328                 ms=  &(p[ 0]); n=i+i;
329                 key= &(p[ n]); n+=j+j;
330                 iv=  &(p[ n]); n+=k+k;
331                 er1= &(s->s3->client_random[0]);
332                 er2= &(s->s3->server_random[0]);
333                 }
334         else
335                 {
336                 n=i;
337                 ms=  &(p[ n]); n+=i+j;
338                 key= &(p[ n]); n+=j+k;
339                 iv=  &(p[ n]); n+=k;
340                 er1= &(s->s3->server_random[0]);
341                 er2= &(s->s3->client_random[0]);
342                 }
343
344         if (n > s->s3->tmp.key_block_length)
345                 {
346                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
347                 goto err2;
348                 }
349
350         EVP_MD_CTX_init(&md);
351         memcpy(mac_secret,ms,i);
352         if (is_exp)
353                 {
354                 /* In here I set both the read and write key/iv to the
355                  * same value since only the correct one will be used :-).
356                  */
357                 EVP_DigestInit_ex(&md,EVP_md5(), NULL);
358                 EVP_DigestUpdate(&md,key,j);
359                 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
360                 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
361                 EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL);
362                 key= &(exp_key[0]);
363
364                 if (k > 0)
365                         {
366                         EVP_DigestInit_ex(&md,EVP_md5(), NULL);
367                         EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
368                         EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
369                         EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL);
370                         iv= &(exp_iv[0]);
371                         }
372                 }
373
374         s->session->key_arg_length=0;
375
376         EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
377
378         OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key));
379         OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv));
380         EVP_MD_CTX_cleanup(&md);
381         return(1);
382 err:
383         SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
384 err2:
385         return(0);
386         }
387
388 int ssl3_setup_key_block(SSL *s)
389         {
390         unsigned char *p;
391         const EVP_CIPHER *c;
392         const EVP_MD *hash;
393         int num;
394         int ret = 0;
395         SSL_COMP *comp;
396
397         if (s->s3->tmp.key_block_length != 0)
398                 return(1);
399
400         if (!ssl_cipher_get_evp(s->session,&c,&hash,NULL,NULL,&comp))
401                 {
402                 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
403                 return(0);
404                 }
405
406         s->s3->tmp.new_sym_enc=c;
407         s->s3->tmp.new_hash=hash;
408 #ifdef OPENSSL_NO_COMP
409         s->s3->tmp.new_compression=NULL;
410 #else
411         s->s3->tmp.new_compression=comp;
412 #endif
413
414         num=EVP_MD_size(hash);
415         if (num < 0)
416                 return 0;
417
418         num=EVP_CIPHER_key_length(c)+num+EVP_CIPHER_iv_length(c);
419         num*=2;
420
421         ssl3_cleanup_key_block(s);
422
423         if ((p=OPENSSL_malloc(num)) == NULL)
424                 goto err;
425
426         s->s3->tmp.key_block_length=num;
427         s->s3->tmp.key_block=p;
428
429         ret = ssl3_generate_key_block(s,p,num);
430
431         if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
432                 {
433                 /* enable vulnerability countermeasure for CBC ciphers with
434                  * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
435                  */
436                 s->s3->need_empty_fragments = 1;
437
438                 if (s->session->cipher != NULL)
439                         {
440                         if (s->session->cipher->algorithm_enc == SSL_eNULL)
441                                 s->s3->need_empty_fragments = 0;
442                         
443 #ifndef OPENSSL_NO_RC4
444                         if (s->session->cipher->algorithm_enc == SSL_RC4)
445                                 s->s3->need_empty_fragments = 0;
446 #endif
447                         }
448                 }
449
450         return ret;
451                 
452 err:
453         SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
454         return(0);
455         }
456
457 void ssl3_cleanup_key_block(SSL *s)
458         {
459         if (s->s3->tmp.key_block != NULL)
460                 {
461                 OPENSSL_cleanse(s->s3->tmp.key_block,
462                         s->s3->tmp.key_block_length);
463                 OPENSSL_free(s->s3->tmp.key_block);
464                 s->s3->tmp.key_block=NULL;
465                 }
466         s->s3->tmp.key_block_length=0;
467         }
468
469 int ssl3_enc(SSL *s, int send)
470         {
471         SSL3_RECORD *rec;
472         EVP_CIPHER_CTX *ds;
473         unsigned long l;
474         int bs,i;
475         const EVP_CIPHER *enc;
476
477         if (send)
478                 {
479                 ds=s->enc_write_ctx;
480                 rec= &(s->s3->wrec);
481                 if (s->enc_write_ctx == NULL)
482                         enc=NULL;
483                 else
484                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
485                 }
486         else
487                 {
488                 ds=s->enc_read_ctx;
489                 rec= &(s->s3->rrec);
490                 if (s->enc_read_ctx == NULL)
491                         enc=NULL;
492                 else
493                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
494                 }
495
496         if ((s->session == NULL) || (ds == NULL) ||
497                 (enc == NULL))
498                 {
499                 memmove(rec->data,rec->input,rec->length);
500                 rec->input=rec->data;
501                 }
502         else
503                 {
504                 l=rec->length;
505                 bs=EVP_CIPHER_block_size(ds->cipher);
506
507                 /* COMPRESS */
508
509                 if ((bs != 1) && send)
510                         {
511                         i=bs-((int)l%bs);
512
513                         /* we need to add 'i-1' padding bytes */
514                         l+=i;
515                         rec->length+=i;
516                         rec->input[l-1]=(i-1);
517                         }
518                 
519                 if (!send)
520                         {
521                         if (l == 0 || l%bs != 0)
522                                 {
523                                 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
524                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
525                                 return 0;
526                                 }
527                         /* otherwise, rec->length >= bs */
528                         }
529                 
530                 EVP_Cipher(ds,rec->data,rec->input,l);
531
532                 if ((bs != 1) && !send)
533                         {
534                         i=rec->data[l-1]+1;
535                         /* SSL 3.0 bounds the number of padding bytes by the block size;
536                          * padding bytes (except the last one) are arbitrary */
537                         if (i > bs)
538                                 {
539                                 /* Incorrect padding. SSLerr() and ssl3_alert are done
540                                  * by caller: we don't want to reveal whether this is
541                                  * a decryption error or a MAC verification failure
542                                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
543                                 return -1;
544                                 }
545                         /* now i <= bs <= rec->length */
546                         rec->length-=i;
547                         }
548                 }
549         return(1);
550         }
551
552 void ssl3_init_finished_mac(SSL *s)
553         {
554         if (s->s3->handshake_buffer) BIO_free(s->s3->handshake_buffer);
555         if (s->s3->handshake_dgst) ssl3_free_digest_list(s);
556     s->s3->handshake_buffer=BIO_new(BIO_s_mem());       
557         (void)BIO_set_close(s->s3->handshake_buffer,BIO_CLOSE);
558         }
559
560 void ssl3_free_digest_list(SSL *s) 
561         {
562         int i;
563         if (!s->s3->handshake_dgst) return;
564         for (i=0;i<SSL_MAX_DIGEST;i++) 
565                 {
566                 if (s->s3->handshake_dgst[i])
567                         EVP_MD_CTX_destroy(s->s3->handshake_dgst[i]);
568                 }
569         OPENSSL_free(s->s3->handshake_dgst);
570         s->s3->handshake_dgst=NULL;
571         }       
572                 
573
574
575 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
576         {
577         if (s->s3->handshake_buffer) 
578                 {
579                 BIO_write (s->s3->handshake_buffer,(void *)buf,len);
580                 } 
581         else 
582                 {
583                 int i;
584                 for (i=0;i< SSL_MAX_DIGEST;i++) 
585                         {
586                         if (s->s3->handshake_dgst[i]!= NULL)
587                         EVP_DigestUpdate(s->s3->handshake_dgst[i],buf,len);
588                         }
589                 }       
590         }
591
592 int ssl3_digest_cached_records(SSL *s)
593         {
594         int i;
595         long mask;
596         const EVP_MD *md;
597         long hdatalen;
598         void *hdata;
599
600         /* Allocate handshake_dgst array */
601         ssl3_free_digest_list(s);
602         s->s3->handshake_dgst = OPENSSL_malloc(SSL_MAX_DIGEST * sizeof(EVP_MD_CTX *));
603         memset(s->s3->handshake_dgst,0,SSL_MAX_DIGEST *sizeof(EVP_MD_CTX *));
604         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,&hdata);
605         if (hdatalen <= 0)
606                 {
607                 SSLerr(SSL_F_DIGEST_CACHED_RECORDS, SSL_R_BAD_HANDSHAKE_LENGTH);
608                 return 0;
609                 }
610
611         /* Loop through bitso of algorithm2 field and create MD_CTX-es */
612         for (i=0;ssl_get_handshake_digest(i,&mask,&md); i++) 
613                 {
614                 if ((mask & s->s3->tmp.new_cipher->algorithm2) && md) 
615                         {
616                         s->s3->handshake_dgst[i]=EVP_MD_CTX_create();
617                         EVP_DigestInit_ex(s->s3->handshake_dgst[i],md,NULL);
618                         EVP_DigestUpdate(s->s3->handshake_dgst[i],hdata,hdatalen);
619                         } 
620                 else 
621                         {       
622                         s->s3->handshake_dgst[i]=NULL;
623                         }
624                 }
625         /* Free handshake_buffer BIO */
626         BIO_free(s->s3->handshake_buffer);
627         s->s3->handshake_buffer = NULL;
628
629         return 1;
630         }
631
632 int ssl3_cert_verify_mac(SSL *s, int md_nid, unsigned char *p)
633         {
634         return(ssl3_handshake_mac(s,md_nid,NULL,0,p));
635         }
636 int ssl3_final_finish_mac(SSL *s, 
637              const char *sender, int len, unsigned char *p)
638         {
639         int ret;
640         ret=ssl3_handshake_mac(s,NID_md5,sender,len,p);
641         p+=ret;
642         ret+=ssl3_handshake_mac(s,NID_sha1,sender,len,p);
643         return(ret);
644         }
645 static int ssl3_handshake_mac(SSL *s, int md_nid,
646              const char *sender, int len, unsigned char *p)
647         {
648         unsigned int ret;
649         int npad,n;
650         unsigned int i;
651         unsigned char md_buf[EVP_MAX_MD_SIZE];
652         EVP_MD_CTX ctx,*d=NULL;
653
654         if (s->s3->handshake_buffer) 
655                 if (!ssl3_digest_cached_records(s))
656                         return 0;
657
658         /* Search for djgest of specified type  in the handshake_dgst
659          * array*/
660         for (i=0;i<SSL_MAX_DIGEST;i++) 
661                 {
662                   if (s->s3->handshake_dgst[i]&&EVP_MD_CTX_type(s->s3->handshake_dgst[i])==md_nid) 
663                         {
664                         d=s->s3->handshake_dgst[i];
665                         break;
666                         }
667                 }
668         if (!d) {
669                 SSLerr(SSL_F_SSL3_HANDSHAKE_MAC,SSL_R_NO_REQUIRED_DIGEST);
670                 return 0;
671         }       
672         EVP_MD_CTX_init(&ctx);
673         EVP_MD_CTX_copy_ex(&ctx,d);
674         n=EVP_MD_CTX_size(&ctx);
675         if (n < 0)
676                 return 0;
677
678         npad=(48/n)*n;
679         if (sender != NULL)
680                 EVP_DigestUpdate(&ctx,sender,len);
681         EVP_DigestUpdate(&ctx,s->session->master_key,
682                 s->session->master_key_length);
683         EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
684         EVP_DigestFinal_ex(&ctx,md_buf,&i);
685
686         EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL);
687         EVP_DigestUpdate(&ctx,s->session->master_key,
688                 s->session->master_key_length);
689         EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
690         EVP_DigestUpdate(&ctx,md_buf,i);
691         EVP_DigestFinal_ex(&ctx,p,&ret);
692
693         EVP_MD_CTX_cleanup(&ctx);
694
695         return((int)ret);
696         }
697
698 int n_ssl3_mac(SSL *ssl, unsigned char *md, int send)
699         {
700         SSL3_RECORD *rec;
701         unsigned char *mac_sec,*seq;
702         EVP_MD_CTX md_ctx;
703         const EVP_MD_CTX *hash;
704         unsigned char *p,rec_char;
705         unsigned int md_size;
706         int npad;
707         int t;
708
709         if (send)
710                 {
711                 rec= &(ssl->s3->wrec);
712                 mac_sec= &(ssl->s3->write_mac_secret[0]);
713                 seq= &(ssl->s3->write_sequence[0]);
714                 hash=ssl->write_hash;
715                 }
716         else
717                 {
718                 rec= &(ssl->s3->rrec);
719                 mac_sec= &(ssl->s3->read_mac_secret[0]);
720                 seq= &(ssl->s3->read_sequence[0]);
721                 hash=ssl->read_hash;
722                 }
723
724         t=EVP_MD_CTX_size(hash);
725         if (t < 0)
726                 return -1;
727         md_size=t;
728         npad=(48/md_size)*md_size;
729
730         /* Chop the digest off the end :-) */
731         EVP_MD_CTX_init(&md_ctx);
732
733         EVP_MD_CTX_copy_ex( &md_ctx,hash);
734         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
735         EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
736         EVP_DigestUpdate(&md_ctx,seq,8);
737         rec_char=rec->type;
738         EVP_DigestUpdate(&md_ctx,&rec_char,1);
739         p=md;
740         s2n(rec->length,p);
741         EVP_DigestUpdate(&md_ctx,md,2);
742         EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
743         EVP_DigestFinal_ex( &md_ctx,md,NULL);
744
745         EVP_MD_CTX_copy_ex( &md_ctx,hash);
746         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
747         EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
748         EVP_DigestUpdate(&md_ctx,md,md_size);
749         EVP_DigestFinal_ex( &md_ctx,md,&md_size);
750
751         EVP_MD_CTX_cleanup(&md_ctx);
752
753         ssl3_record_sequence_update(seq);
754         return(md_size);
755         }
756
757 void ssl3_record_sequence_update(unsigned char *seq)
758         {
759         int i;
760
761         for (i=7; i>=0; i--)
762                 {
763                 ++seq[i];
764                 if (seq[i] != 0) break; 
765                 }
766         }
767
768 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
769              int len)
770         {
771         static const unsigned char *salt[3]={
772 #ifndef CHARSET_EBCDIC
773                 (const unsigned char *)"A",
774                 (const unsigned char *)"BB",
775                 (const unsigned char *)"CCC",
776 #else
777                 (const unsigned char *)"\x41",
778                 (const unsigned char *)"\x42\x42",
779                 (const unsigned char *)"\x43\x43\x43",
780 #endif
781                 };
782         unsigned char buf[EVP_MAX_MD_SIZE];
783         EVP_MD_CTX ctx;
784         int i,ret=0;
785         unsigned int n;
786
787         EVP_MD_CTX_init(&ctx);
788         for (i=0; i<3; i++)
789                 {
790                 EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL);
791                 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
792                 EVP_DigestUpdate(&ctx,p,len);
793                 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
794                         SSL3_RANDOM_SIZE);
795                 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
796                         SSL3_RANDOM_SIZE);
797                 EVP_DigestFinal_ex(&ctx,buf,&n);
798
799                 EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL);
800                 EVP_DigestUpdate(&ctx,p,len);
801                 EVP_DigestUpdate(&ctx,buf,n);
802                 EVP_DigestFinal_ex(&ctx,out,&n);
803                 out+=n;
804                 ret+=n;
805                 }
806         EVP_MD_CTX_cleanup(&ctx);
807         return(ret);
808         }
809
810 int ssl3_alert_code(int code)
811         {
812         switch (code)
813                 {
814         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
815         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
816         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
817         case SSL_AD_DECRYPTION_FAILED:  return(SSL3_AD_BAD_RECORD_MAC);
818         case SSL_AD_RECORD_OVERFLOW:    return(SSL3_AD_BAD_RECORD_MAC);
819         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
820         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
821         case SSL_AD_NO_CERTIFICATE:     return(SSL3_AD_NO_CERTIFICATE);
822         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
823         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
824         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
825         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
826         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
827         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
828         case SSL_AD_UNKNOWN_CA:         return(SSL3_AD_BAD_CERTIFICATE);
829         case SSL_AD_ACCESS_DENIED:      return(SSL3_AD_HANDSHAKE_FAILURE);
830         case SSL_AD_DECODE_ERROR:       return(SSL3_AD_HANDSHAKE_FAILURE);
831         case SSL_AD_DECRYPT_ERROR:      return(SSL3_AD_HANDSHAKE_FAILURE);
832         case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE);
833         case SSL_AD_PROTOCOL_VERSION:   return(SSL3_AD_HANDSHAKE_FAILURE);
834         case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
835         case SSL_AD_INTERNAL_ERROR:     return(SSL3_AD_HANDSHAKE_FAILURE);
836         case SSL_AD_USER_CANCELLED:     return(SSL3_AD_HANDSHAKE_FAILURE);
837         case SSL_AD_NO_RENEGOTIATION:   return(-1); /* Don't send it :-) */
838         case SSL_AD_UNSUPPORTED_EXTENSION: return(SSL3_AD_HANDSHAKE_FAILURE);
839         case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(SSL3_AD_HANDSHAKE_FAILURE);
840         case SSL_AD_UNRECOGNIZED_NAME:  return(SSL3_AD_HANDSHAKE_FAILURE);
841         case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(SSL3_AD_HANDSHAKE_FAILURE);
842         case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(SSL3_AD_HANDSHAKE_FAILURE);
843         case SSL_AD_UNKNOWN_PSK_IDENTITY:return(TLS1_AD_UNKNOWN_PSK_IDENTITY);
844         default:                        return(-1);
845                 }
846         }
847