56e274fe2ab84a052ad550156cc6f4e9b1ac518d
[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) 1998-2002 The OpenSSL Project.  All rights reserved.
60  *
61  * Redistribution and use in source and binary forms, with or without
62  * modification, are permitted provided that the following conditions
63  * are met:
64  *
65  * 1. Redistributions of source code must retain the above copyright
66  *    notice, this list of conditions and the following disclaimer. 
67  *
68  * 2. Redistributions in binary form must reproduce the above copyright
69  *    notice, this list of conditions and the following disclaimer in
70  *    the documentation and/or other materials provided with the
71  *    distribution.
72  *
73  * 3. All advertising materials mentioning features or use of this
74  *    software must display the following acknowledgment:
75  *    "This product includes software developed by the OpenSSL Project
76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77  *
78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79  *    endorse or promote products derived from this software without
80  *    prior written permission. For written permission, please contact
81  *    openssl-core@openssl.org.
82  *
83  * 5. Products derived from this software may not be called "OpenSSL"
84  *    nor may "OpenSSL" appear in their names without prior written
85  *    permission of the OpenSSL Project.
86  *
87  * 6. Redistributions of any form whatsoever must retain the following
88  *    acknowledgment:
89  *    "This product includes software developed by the OpenSSL Project
90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91  *
92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103  * OF THE POSSIBILITY OF SUCH DAMAGE.
104  * ====================================================================
105  *
106  * This product includes cryptographic software written by Eric Young
107  * (eay@cryptsoft.com).  This product includes software written by Tim
108  * Hudson (tjh@cryptsoft.com).
109  *
110  */
111
112 #include <stdio.h>
113 #include "ssl_locl.h"
114 #include <openssl/evp.h>
115 #include <openssl/md5.h>
116
117 static unsigned char ssl3_pad_1[48]={
118         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
119         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
120         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
121         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
122         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
123         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36 };
124
125 static unsigned char ssl3_pad_2[48]={
126         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
127         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
128         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
129         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
130         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
131         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c };
132
133 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
134         const char *sender, int len, unsigned char *p);
135
136 static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num)
137         {
138         EVP_MD_CTX m5;
139         EVP_MD_CTX s1;
140         unsigned char buf[16],smd[SHA_DIGEST_LENGTH];
141         unsigned char c='A';
142         unsigned int i,j,k;
143
144 #ifdef CHARSET_EBCDIC
145         c = os_toascii[c]; /*'A' in ASCII */
146 #endif
147         k=0;
148         EVP_MD_CTX_init(&m5);
149         EVP_MD_CTX_init(&s1);
150         for (i=0; (int)i<num; i+=MD5_DIGEST_LENGTH)
151                 {
152                 k++;
153                 if (k > sizeof buf)
154                         {
155                         /* bug: 'buf' is too small for this ciphersuite */
156                         SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);
157                         return 0;
158                         }
159                 
160                 for (j=0; j<k; j++)
161                         buf[j]=c;
162                 c++;
163                 EVP_DigestInit_ex(&s1,EVP_sha1(), NULL);
164                 EVP_DigestUpdate(&s1,buf,k);
165                 EVP_DigestUpdate(&s1,s->session->master_key,
166                         s->session->master_key_length);
167                 EVP_DigestUpdate(&s1,s->s3->server_random,SSL3_RANDOM_SIZE);
168                 EVP_DigestUpdate(&s1,s->s3->client_random,SSL3_RANDOM_SIZE);
169                 EVP_DigestFinal_ex(&s1,smd,NULL);
170
171                 EVP_DigestInit_ex(&m5,EVP_md5(), NULL);
172                 EVP_DigestUpdate(&m5,s->session->master_key,
173                         s->session->master_key_length);
174                 EVP_DigestUpdate(&m5,smd,SHA_DIGEST_LENGTH);
175                 if ((int)(i+MD5_DIGEST_LENGTH) > num)
176                         {
177                         EVP_DigestFinal_ex(&m5,smd,NULL);
178                         memcpy(km,smd,(num-i));
179                         }
180                 else
181                         EVP_DigestFinal_ex(&m5,km,NULL);
182
183                 km+=MD5_DIGEST_LENGTH;
184                 }
185         OPENSSL_cleanse(smd,SHA_DIGEST_LENGTH);
186         EVP_MD_CTX_cleanup(&m5);
187         EVP_MD_CTX_cleanup(&s1);
188         return 1;
189         }
190
191 int ssl3_change_cipher_state(SSL *s, int which)
192         {
193         unsigned char *p,*key_block,*mac_secret;
194         unsigned char exp_key[EVP_MAX_KEY_LENGTH];
195         unsigned char exp_iv[EVP_MAX_IV_LENGTH];
196         unsigned char *ms,*key,*iv,*er1,*er2;
197         EVP_CIPHER_CTX *dd;
198         const EVP_CIPHER *c;
199         COMP_METHOD *comp;
200         const EVP_MD *m;
201         EVP_MD_CTX md;
202         int exp,n,i,j,k,cl;
203         int reuse_dd = 0;
204
205         exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
206         c=s->s3->tmp.new_sym_enc;
207         m=s->s3->tmp.new_hash;
208         if (s->s3->tmp.new_compression == NULL)
209                 comp=NULL;
210         else
211                 comp=s->s3->tmp.new_compression->method;
212         key_block=s->s3->tmp.key_block;
213
214         if (which & SSL3_CC_READ)
215                 {
216                 if (s->enc_read_ctx != NULL)
217                         reuse_dd = 1;
218                 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
219                         goto err;
220                 dd= s->enc_read_ctx;
221                 s->read_hash=m;
222                 /* COMPRESS */
223                 if (s->expand != NULL)
224                         {
225                         COMP_CTX_free(s->expand);
226                         s->expand=NULL;
227                         }
228                 if (comp != NULL)
229                         {
230                         s->expand=COMP_CTX_new(comp);
231                         if (s->expand == NULL)
232                                 {
233                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
234                                 goto err2;
235                                 }
236                         if (s->s3->rrec.comp == NULL)
237                                 s->s3->rrec.comp=(unsigned char *)
238                                         OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);
239                         if (s->s3->rrec.comp == NULL)
240                                 goto err;
241                         }
242                 memset(&(s->s3->read_sequence[0]),0,8);
243                 mac_secret= &(s->s3->read_mac_secret[0]);
244                 }
245         else
246                 {
247                 if (s->enc_write_ctx != NULL)
248                         reuse_dd = 1;
249                 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
250                         goto err;
251                 dd= s->enc_write_ctx;
252                 s->write_hash=m;
253                 /* COMPRESS */
254                 if (s->compress != NULL)
255                         {
256                         COMP_CTX_free(s->compress);
257                         s->compress=NULL;
258                         }
259                 if (comp != NULL)
260                         {
261                         s->compress=COMP_CTX_new(comp);
262                         if (s->compress == NULL)
263                                 {
264                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
265                                 goto err2;
266                                 }
267                         }
268                 memset(&(s->s3->write_sequence[0]),0,8);
269                 mac_secret= &(s->s3->write_mac_secret[0]);
270                 }
271
272         if (reuse_dd)
273                 EVP_CIPHER_CTX_cleanup(dd);
274         EVP_CIPHER_CTX_init(dd);
275
276         p=s->s3->tmp.key_block;
277         i=EVP_MD_size(m);
278         cl=EVP_CIPHER_key_length(c);
279         j=exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
280                  cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
281         /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
282         k=EVP_CIPHER_iv_length(c);
283         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
284                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
285                 {
286                 ms=  &(p[ 0]); n=i+i;
287                 key= &(p[ n]); n+=j+j;
288                 iv=  &(p[ n]); n+=k+k;
289                 er1= &(s->s3->client_random[0]);
290                 er2= &(s->s3->server_random[0]);
291                 }
292         else
293                 {
294                 n=i;
295                 ms=  &(p[ n]); n+=i+j;
296                 key= &(p[ n]); n+=j+k;
297                 iv=  &(p[ n]); n+=k;
298                 er1= &(s->s3->server_random[0]);
299                 er2= &(s->s3->client_random[0]);
300                 }
301
302         if (n > s->s3->tmp.key_block_length)
303                 {
304                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
305                 goto err2;
306                 }
307
308         EVP_MD_CTX_init(&md);
309         memcpy(mac_secret,ms,i);
310         if (exp)
311                 {
312                 /* In here I set both the read and write key/iv to the
313                  * same value since only the correct one will be used :-).
314                  */
315                 EVP_DigestInit_ex(&md,EVP_md5(), NULL);
316                 EVP_DigestUpdate(&md,key,j);
317                 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
318                 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
319                 EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL);
320                 key= &(exp_key[0]);
321
322                 if (k > 0)
323                         {
324                         EVP_DigestInit_ex(&md,EVP_md5(), NULL);
325                         EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
326                         EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
327                         EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL);
328                         iv= &(exp_iv[0]);
329                         }
330                 }
331
332         s->session->key_arg_length=0;
333
334         EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
335
336         OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key));
337         OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv));
338         EVP_MD_CTX_cleanup(&md);
339         return(1);
340 err:
341         SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
342 err2:
343         return(0);
344         }
345
346 int ssl3_setup_key_block(SSL *s)
347         {
348         unsigned char *p;
349         const EVP_CIPHER *c;
350         const EVP_MD *hash;
351         int num;
352         int ret = 0;
353         SSL_COMP *comp;
354
355         if (s->s3->tmp.key_block_length != 0)
356                 return(1);
357
358         if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
359                 {
360                 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
361                 return(0);
362                 }
363
364         s->s3->tmp.new_sym_enc=c;
365         s->s3->tmp.new_hash=hash;
366         s->s3->tmp.new_compression=comp;
367
368         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
369         num*=2;
370
371         ssl3_cleanup_key_block(s);
372
373         if ((p=OPENSSL_malloc(num)) == NULL)
374                 goto err;
375
376         s->s3->tmp.key_block_length=num;
377         s->s3->tmp.key_block=p;
378
379         ret = ssl3_generate_key_block(s,p,num);
380
381         if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
382                 {
383                 /* enable vulnerability countermeasure for CBC ciphers with
384                  * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
385                  */
386                 s->s3->need_empty_fragments = 1;
387
388                 if (s->session->cipher != NULL)
389                         {
390                         if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL)
391                                 s->s3->need_empty_fragments = 0;
392                         
393 #ifndef OPENSSL_NO_RC4
394                         if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4)
395                                 s->s3->need_empty_fragments = 0;
396 #endif
397                         }
398                 }
399
400         return ret;
401                 
402 err:
403         SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
404         return(0);
405         }
406
407 void ssl3_cleanup_key_block(SSL *s)
408         {
409         if (s->s3->tmp.key_block != NULL)
410                 {
411                 OPENSSL_cleanse(s->s3->tmp.key_block,
412                         s->s3->tmp.key_block_length);
413                 OPENSSL_free(s->s3->tmp.key_block);
414                 s->s3->tmp.key_block=NULL;
415                 }
416         s->s3->tmp.key_block_length=0;
417         }
418
419 int ssl3_enc(SSL *s, int send)
420         {
421         SSL3_RECORD *rec;
422         EVP_CIPHER_CTX *ds;
423         unsigned long l;
424         int bs,i;
425         const EVP_CIPHER *enc;
426
427         if (send)
428                 {
429                 ds=s->enc_write_ctx;
430                 rec= &(s->s3->wrec);
431                 if (s->enc_write_ctx == NULL)
432                         enc=NULL;
433                 else
434                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
435                 }
436         else
437                 {
438                 ds=s->enc_read_ctx;
439                 rec= &(s->s3->rrec);
440                 if (s->enc_read_ctx == NULL)
441                         enc=NULL;
442                 else
443                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
444                 }
445
446         if ((s->session == NULL) || (ds == NULL) ||
447                 (enc == NULL))
448                 {
449                 memmove(rec->data,rec->input,rec->length);
450                 rec->input=rec->data;
451                 }
452         else
453                 {
454                 l=rec->length;
455                 bs=EVP_CIPHER_block_size(ds->cipher);
456
457                 /* COMPRESS */
458
459                 if ((bs != 1) && send)
460                         {
461                         i=bs-((int)l%bs);
462
463                         /* we need to add 'i-1' padding bytes */
464                         l+=i;
465                         rec->length+=i;
466                         rec->input[l-1]=(i-1);
467                         }
468                 
469                 if (!send)
470                         {
471                         if (l == 0 || l%bs != 0)
472                                 {
473                                 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
474                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
475                                 return 0;
476                                 }
477                         /* otherwise, rec->length >= bs */
478                         }
479                 
480                 EVP_Cipher(ds,rec->data,rec->input,l);
481
482                 if ((bs != 1) && !send)
483                         {
484                         i=rec->data[l-1]+1;
485                         /* SSL 3.0 bounds the number of padding bytes by the block size;
486                          * padding bytes (except the last one) are arbitrary */
487                         if (i > bs)
488                                 {
489                                 /* Incorrect padding. SSLerr() and ssl3_alert are done
490                                  * by caller: we don't want to reveal whether this is
491                                  * a decryption error or a MAC verification failure
492                                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
493                                 return -1;
494                                 }
495                         /* now i <= bs <= rec->length */
496                         rec->length-=i;
497                         }
498                 }
499         return(1);
500         }
501
502 void ssl3_init_finished_mac(SSL *s)
503         {
504         EVP_DigestInit_ex(&(s->s3->finish_dgst1),s->ctx->md5, NULL);
505         EVP_DigestInit_ex(&(s->s3->finish_dgst2),s->ctx->sha1, NULL);
506         }
507
508 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
509         {
510         EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);
511         EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);
512         }
513
514 int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p)
515         {
516         return(ssl3_handshake_mac(s,ctx,NULL,0,p));
517         }
518
519 int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2,
520              const char *sender, int len, unsigned char *p)
521         {
522         int ret;
523
524         ret=ssl3_handshake_mac(s,ctx1,sender,len,p);
525         p+=ret;
526         ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);
527         return(ret);
528         }
529
530 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
531              const char *sender, int len, unsigned char *p)
532         {
533         unsigned int ret;
534         int npad,n;
535         unsigned int i;
536         unsigned char md_buf[EVP_MAX_MD_SIZE];
537         EVP_MD_CTX ctx;
538
539         EVP_MD_CTX_init(&ctx);
540         EVP_MD_CTX_copy_ex(&ctx,in_ctx);
541
542         n=EVP_MD_CTX_size(&ctx);
543         npad=(48/n)*n;
544
545         if (sender != NULL)
546                 EVP_DigestUpdate(&ctx,sender,len);
547         EVP_DigestUpdate(&ctx,s->session->master_key,
548                 s->session->master_key_length);
549         EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
550         EVP_DigestFinal_ex(&ctx,md_buf,&i);
551
552         EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL);
553         EVP_DigestUpdate(&ctx,s->session->master_key,
554                 s->session->master_key_length);
555         EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
556         EVP_DigestUpdate(&ctx,md_buf,i);
557         EVP_DigestFinal_ex(&ctx,p,&ret);
558
559         EVP_MD_CTX_cleanup(&ctx);
560
561         return((int)ret);
562         }
563
564 int ssl3_mac(SSL *ssl, unsigned char *md, int send)
565         {
566         SSL3_RECORD *rec;
567         unsigned char *mac_sec,*seq;
568         EVP_MD_CTX md_ctx;
569         const EVP_MD *hash;
570         unsigned char *p,rec_char;
571         unsigned int md_size;
572         int npad,i;
573
574         if (send)
575                 {
576                 rec= &(ssl->s3->wrec);
577                 mac_sec= &(ssl->s3->write_mac_secret[0]);
578                 seq= &(ssl->s3->write_sequence[0]);
579                 hash=ssl->write_hash;
580                 }
581         else
582                 {
583                 rec= &(ssl->s3->rrec);
584                 mac_sec= &(ssl->s3->read_mac_secret[0]);
585                 seq= &(ssl->s3->read_sequence[0]);
586                 hash=ssl->read_hash;
587                 }
588
589         md_size=EVP_MD_size(hash);
590         npad=(48/md_size)*md_size;
591
592         /* Chop the digest off the end :-) */
593         EVP_MD_CTX_init(&md_ctx);
594
595         EVP_DigestInit_ex(  &md_ctx,hash, NULL);
596         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
597         EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
598         EVP_DigestUpdate(&md_ctx,seq,8);
599         rec_char=rec->type;
600         EVP_DigestUpdate(&md_ctx,&rec_char,1);
601         p=md;
602         s2n(rec->length,p);
603         EVP_DigestUpdate(&md_ctx,md,2);
604         EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
605         EVP_DigestFinal_ex( &md_ctx,md,NULL);
606
607         EVP_DigestInit_ex(  &md_ctx,hash, NULL);
608         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
609         EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
610         EVP_DigestUpdate(&md_ctx,md,md_size);
611         EVP_DigestFinal_ex( &md_ctx,md,&md_size);
612
613         EVP_MD_CTX_cleanup(&md_ctx);
614
615         for (i=7; i>=0; i--)
616                 {
617                 ++seq[i];
618                 if (seq[i] != 0) break; 
619                 }
620
621         return(md_size);
622         }
623
624 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
625              int len)
626         {
627         static const unsigned char *salt[3]={
628 #ifndef CHARSET_EBCDIC
629                 (const unsigned char *)"A",
630                 (const unsigned char *)"BB",
631                 (const unsigned char *)"CCC",
632 #else
633                 (const unsigned char *)"\x41",
634                 (const unsigned char *)"\x42\x42",
635                 (const unsigned char *)"\x43\x43\x43",
636 #endif
637                 };
638         unsigned char buf[EVP_MAX_MD_SIZE];
639         EVP_MD_CTX ctx;
640         int i,ret=0;
641         unsigned int n;
642
643         EVP_MD_CTX_init(&ctx);
644         for (i=0; i<3; i++)
645                 {
646                 EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL);
647                 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
648                 EVP_DigestUpdate(&ctx,p,len);
649                 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
650                         SSL3_RANDOM_SIZE);
651                 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
652                         SSL3_RANDOM_SIZE);
653                 EVP_DigestFinal_ex(&ctx,buf,&n);
654
655                 EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL);
656                 EVP_DigestUpdate(&ctx,p,len);
657                 EVP_DigestUpdate(&ctx,buf,n);
658                 EVP_DigestFinal_ex(&ctx,out,&n);
659                 out+=n;
660                 ret+=n;
661                 }
662         EVP_MD_CTX_cleanup(&ctx);
663         return(ret);
664         }
665
666 int ssl3_alert_code(int code)
667         {
668         switch (code)
669                 {
670         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
671         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
672         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
673         case SSL_AD_DECRYPTION_FAILED:  return(SSL3_AD_BAD_RECORD_MAC);
674         case SSL_AD_RECORD_OVERFLOW:    return(SSL3_AD_BAD_RECORD_MAC);
675         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
676         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
677         case SSL_AD_NO_CERTIFICATE:     return(SSL3_AD_NO_CERTIFICATE);
678         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
679         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
680         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
681         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
682         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
683         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
684         case SSL_AD_UNKNOWN_CA:         return(SSL3_AD_BAD_CERTIFICATE);
685         case SSL_AD_ACCESS_DENIED:      return(SSL3_AD_HANDSHAKE_FAILURE);
686         case SSL_AD_DECODE_ERROR:       return(SSL3_AD_HANDSHAKE_FAILURE);
687         case SSL_AD_DECRYPT_ERROR:      return(SSL3_AD_HANDSHAKE_FAILURE);
688         case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE);
689         case SSL_AD_PROTOCOL_VERSION:   return(SSL3_AD_HANDSHAKE_FAILURE);
690         case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
691         case SSL_AD_INTERNAL_ERROR:     return(SSL3_AD_HANDSHAKE_FAILURE);
692         case SSL_AD_USER_CANCELLED:     return(SSL3_AD_HANDSHAKE_FAILURE);
693         case SSL_AD_NO_RENEGOTIATION:   return(-1); /* Don't send it :-) */
694         default:                        return(-1);
695                 }
696         }
697