13ef517731392e3f19ae5d7da4bf97642544e0f7
[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 #include <stdio.h>
60 #include <openssl/evp.h>
61 #include "ssl_locl.h"
62 #include <openssl/md5.h>
63
64 static unsigned char ssl3_pad_1[48]={
65         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
66         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
67         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
68         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
69         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
70         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36 };
71
72 static unsigned char ssl3_pad_2[48]={
73         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
74         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
75         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
76         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
77         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
78         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c };
79
80 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
81         const char *sender, int len, unsigned char *p);
82
83 static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num)
84         {
85         EVP_MD_CTX m5;
86         EVP_MD_CTX s1;
87         unsigned char buf[16],smd[SHA_DIGEST_LENGTH];
88         unsigned char c='A';
89         int i,j,k;
90
91 #ifdef CHARSET_EBCDIC
92         c = os_toascii[c]; /*'A' in ASCII */
93 #endif
94         k=0;
95         EVP_MD_CTX_init(&m5);
96         EVP_MD_CTX_init(&s1);
97         for (i=0; i<num; i+=MD5_DIGEST_LENGTH)
98                 {
99                 k++;
100                 if (k > sizeof buf)
101                         {
102                         /* bug: 'buf' is too small for this ciphersuite */
103                         SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);
104                         return 0;
105                         }
106                 
107                 for (j=0; j<k; j++)
108                         buf[j]=c;
109                 c++;
110                 EVP_DigestInit(&s1,EVP_sha1());
111                 EVP_DigestUpdate(&s1,buf,k);
112                 EVP_DigestUpdate(&s1,s->session->master_key,
113                         s->session->master_key_length);
114                 EVP_DigestUpdate(&s1,s->s3->server_random,SSL3_RANDOM_SIZE);
115                 EVP_DigestUpdate(&s1,s->s3->client_random,SSL3_RANDOM_SIZE);
116                 EVP_DigestFinal(&s1,smd,NULL);
117
118                 EVP_DigestInit(&m5,EVP_md5());
119                 EVP_DigestUpdate(&m5,s->session->master_key,
120                         s->session->master_key_length);
121                 EVP_DigestUpdate(&m5,smd,SHA_DIGEST_LENGTH);
122                 if ((i+MD5_DIGEST_LENGTH) > num)
123                         {
124                         EVP_DigestFinal(&m5,smd,NULL);
125                         memcpy(km,smd,(num-i));
126                         }
127                 else
128                         EVP_DigestFinal(&m5,km,NULL);
129
130                 km+=MD5_DIGEST_LENGTH;
131                 }
132         memset(smd,0,SHA_DIGEST_LENGTH);
133         EVP_MD_CTX_cleanup(&m5);
134         EVP_MD_CTX_cleanup(&s1);
135         return 1;
136         }
137
138 int ssl3_change_cipher_state(SSL *s, int which)
139         {
140         unsigned char *p,*key_block,*mac_secret;
141         unsigned char exp_key[EVP_MAX_KEY_LENGTH];
142         unsigned char exp_iv[EVP_MAX_KEY_LENGTH];
143         unsigned char *ms,*key,*iv,*er1,*er2;
144         EVP_CIPHER_CTX *dd;
145         const EVP_CIPHER *c;
146         COMP_METHOD *comp;
147         const EVP_MD *m;
148         EVP_MD_CTX md;
149         int exp,n,i,j,k,cl;
150
151         exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
152         c=s->s3->tmp.new_sym_enc;
153         m=s->s3->tmp.new_hash;
154         if (s->s3->tmp.new_compression == NULL)
155                 comp=NULL;
156         else
157                 comp=s->s3->tmp.new_compression->method;
158         key_block=s->s3->tmp.key_block;
159
160         if (which & SSL3_CC_READ)
161                 {
162                 if ((s->enc_read_ctx == NULL) &&
163                         ((s->enc_read_ctx=(EVP_CIPHER_CTX *)
164                         OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
165                         goto err;
166                 dd= s->enc_read_ctx;
167                 s->read_hash=m;
168                 /* COMPRESS */
169                 if (s->expand != NULL)
170                         {
171                         COMP_CTX_free(s->expand);
172                         s->expand=NULL;
173                         }
174                 if (comp != NULL)
175                         {
176                         s->expand=COMP_CTX_new(comp);
177                         if (s->expand == NULL)
178                                 {
179                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
180                                 goto err2;
181                                 }
182                         if (s->s3->rrec.comp == NULL)
183                                 s->s3->rrec.comp=(unsigned char *)
184                                         OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);
185                         if (s->s3->rrec.comp == NULL)
186                                 goto err;
187                         }
188                 memset(&(s->s3->read_sequence[0]),0,8);
189                 mac_secret= &(s->s3->read_mac_secret[0]);
190                 }
191         else
192                 {
193                 if ((s->enc_write_ctx == NULL) &&
194                         ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
195                         OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
196                         goto err;
197                 dd= s->enc_write_ctx;
198                 s->write_hash=m;
199                 /* COMPRESS */
200                 if (s->compress != NULL)
201                         {
202                         COMP_CTX_free(s->compress);
203                         s->compress=NULL;
204                         }
205                 if (comp != NULL)
206                         {
207                         s->compress=COMP_CTX_new(comp);
208                         if (s->compress == NULL)
209                                 {
210                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
211                                 goto err2;
212                                 }
213                         }
214                 memset(&(s->s3->write_sequence[0]),0,8);
215                 mac_secret= &(s->s3->write_mac_secret[0]);
216                 }
217
218         EVP_CIPHER_CTX_init(dd);
219
220         p=s->s3->tmp.key_block;
221         i=EVP_MD_size(m);
222         cl=EVP_CIPHER_key_length(c);
223         j=exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
224                  cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
225         /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
226         k=EVP_CIPHER_iv_length(c);
227         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
228                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
229                 {
230                 ms=  &(p[ 0]); n=i+i;
231                 key= &(p[ n]); n+=j+j;
232                 iv=  &(p[ n]); n+=k+k;
233                 er1= &(s->s3->client_random[0]);
234                 er2= &(s->s3->server_random[0]);
235                 }
236         else
237                 {
238                 n=i;
239                 ms=  &(p[ n]); n+=i+j;
240                 key= &(p[ n]); n+=j+k;
241                 iv=  &(p[ n]); n+=k;
242                 er1= &(s->s3->server_random[0]);
243                 er2= &(s->s3->client_random[0]);
244                 }
245
246         if (n > s->s3->tmp.key_block_length)
247                 {
248                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
249                 goto err2;
250                 }
251
252         EVP_MD_CTX_init(&md);
253         memcpy(mac_secret,ms,i);
254         if (exp)
255                 {
256                 /* In here I set both the read and write key/iv to the
257                  * same value since only the correct one will be used :-).
258                  */
259                 EVP_DigestInit(&md,EVP_md5());
260                 EVP_DigestUpdate(&md,key,j);
261                 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
262                 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
263                 EVP_DigestFinal(&md,&(exp_key[0]),NULL);
264                 key= &(exp_key[0]);
265
266                 if (k > 0)
267                         {
268                         EVP_DigestInit(&md,EVP_md5());
269                         EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
270                         EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
271                         EVP_DigestFinal(&md,&(exp_iv[0]),NULL);
272                         iv= &(exp_iv[0]);
273                         }
274                 }
275
276         s->session->key_arg_length=0;
277
278         EVP_CipherInit(dd,c,key,iv,(which & SSL3_CC_WRITE));
279
280         memset(&(exp_key[0]),0,sizeof(exp_key));
281         memset(&(exp_iv[0]),0,sizeof(exp_iv));
282         EVP_MD_CTX_cleanup(&md);
283         return(1);
284 err:
285         SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
286 err2:
287         return(0);
288         }
289
290 int ssl3_setup_key_block(SSL *s)
291         {
292         unsigned char *p;
293         const EVP_CIPHER *c;
294         const EVP_MD *hash;
295         int num;
296         SSL_COMP *comp;
297
298         if (s->s3->tmp.key_block_length != 0)
299                 return(1);
300
301         if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
302                 {
303                 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
304                 return(0);
305                 }
306
307         s->s3->tmp.new_sym_enc=c;
308         s->s3->tmp.new_hash=hash;
309         s->s3->tmp.new_compression=comp;
310
311         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
312         num*=2;
313
314         ssl3_cleanup_key_block(s);
315
316         if ((p=OPENSSL_malloc(num)) == NULL)
317                 goto err;
318
319         s->s3->tmp.key_block_length=num;
320         s->s3->tmp.key_block=p;
321
322         return ssl3_generate_key_block(s,p,num);
323
324 err:
325         SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
326         return(0);
327         }
328
329 void ssl3_cleanup_key_block(SSL *s)
330         {
331         if (s->s3->tmp.key_block != NULL)
332                 {
333                 memset(s->s3->tmp.key_block,0,
334                         s->s3->tmp.key_block_length);
335                 OPENSSL_free(s->s3->tmp.key_block);
336                 s->s3->tmp.key_block=NULL;
337                 }
338         s->s3->tmp.key_block_length=0;
339         }
340
341 int ssl3_enc(SSL *s, int send)
342         {
343         SSL3_RECORD *rec;
344         EVP_CIPHER_CTX *ds;
345         unsigned long l;
346         int bs,i;
347         const EVP_CIPHER *enc;
348
349         if (send)
350                 {
351                 ds=s->enc_write_ctx;
352                 rec= &(s->s3->wrec);
353                 if (s->enc_write_ctx == NULL)
354                         enc=NULL;
355                 else
356                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
357                 }
358         else
359                 {
360                 ds=s->enc_read_ctx;
361                 rec= &(s->s3->rrec);
362                 if (s->enc_read_ctx == NULL)
363                         enc=NULL;
364                 else
365                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
366                 }
367
368         if ((s->session == NULL) || (ds == NULL) ||
369                 (enc == NULL))
370                 {
371                 memmove(rec->data,rec->input,rec->length);
372                 rec->input=rec->data;
373                 }
374         else
375                 {
376                 l=rec->length;
377                 bs=EVP_CIPHER_block_size(ds->cipher);
378
379                 /* COMPRESS */
380
381                 if ((bs != 1) && send)
382                         {
383                         i=bs-((int)l%bs);
384
385                         /* we need to add 'i-1' padding bytes */
386                         l+=i;
387                         rec->length+=i;
388                         rec->input[l-1]=(i-1);
389                         }
390                 
391                 if (!send)
392                         {
393                         if (l == 0 || l%bs != 0)
394                                 {
395                                 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
396                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
397                                 return 0;
398                                 }
399                         }
400                 
401                 EVP_Cipher(ds,rec->data,rec->input,l);
402
403                 if ((bs != 1) && !send)
404                         {
405                         i=rec->data[l-1]+1;
406                         /* SSL 3.0 bounds the number of padding bytes by the block size;
407                          * padding bytes (except that last) are arbitrary */
408                         if (i > bs)
409                                 {
410                                 /* Incorrect padding. SSLerr() and ssl3_alert are done
411                                  * by caller: we don't want to reveal whether this is
412                                  * a decryption error or a MAC verification failure. */
413                                 return -1;
414                                 }
415                         rec->length-=i;
416                         }
417                 }
418         return(1);
419         }
420
421 void ssl3_init_finished_mac(SSL *s)
422         {
423         EVP_DigestInit(&(s->s3->finish_dgst1),s->ctx->md5);
424         EVP_DigestInit(&(s->s3->finish_dgst2),s->ctx->sha1);
425         }
426
427 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
428         {
429         EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);
430         EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);
431         }
432
433 int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p)
434         {
435         return(ssl3_handshake_mac(s,ctx,NULL,0,p));
436         }
437
438 int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2,
439              const char *sender, int len, unsigned char *p)
440         {
441         int ret;
442
443         ret=ssl3_handshake_mac(s,ctx1,sender,len,p);
444         p+=ret;
445         ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);
446         return(ret);
447         }
448
449 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
450              const char *sender, int len, unsigned char *p)
451         {
452         unsigned int ret;
453         int npad,n;
454         unsigned int i;
455         unsigned char md_buf[EVP_MAX_MD_SIZE];
456         EVP_MD_CTX ctx;
457
458         EVP_MD_CTX_init(&ctx);
459         EVP_MD_CTX_copy(&ctx,in_ctx);
460
461         n=EVP_MD_CTX_size(&ctx);
462         npad=(48/n)*n;
463
464         if (sender != NULL)
465                 EVP_DigestUpdate(&ctx,sender,len);
466         EVP_DigestUpdate(&ctx,s->session->master_key,
467                 s->session->master_key_length);
468         EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
469         EVP_DigestFinal(&ctx,md_buf,&i);
470
471         EVP_DigestInit(&ctx,EVP_MD_CTX_md(&ctx));
472         EVP_DigestUpdate(&ctx,s->session->master_key,
473                 s->session->master_key_length);
474         EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
475         EVP_DigestUpdate(&ctx,md_buf,i);
476         EVP_DigestFinal(&ctx,p,&ret);
477
478         EVP_MD_CTX_cleanup(&ctx);
479
480         return((int)ret);
481         }
482
483 int ssl3_mac(SSL *ssl, unsigned char *md, int send)
484         {
485         SSL3_RECORD *rec;
486         unsigned char *mac_sec,*seq;
487         EVP_MD_CTX md_ctx;
488         const EVP_MD *hash;
489         unsigned char *p,rec_char;
490         unsigned int md_size;
491         int npad,i;
492
493         if (send)
494                 {
495                 rec= &(ssl->s3->wrec);
496                 mac_sec= &(ssl->s3->write_mac_secret[0]);
497                 seq= &(ssl->s3->write_sequence[0]);
498                 hash=ssl->write_hash;
499                 }
500         else
501                 {
502                 rec= &(ssl->s3->rrec);
503                 mac_sec= &(ssl->s3->read_mac_secret[0]);
504                 seq= &(ssl->s3->read_sequence[0]);
505                 hash=ssl->read_hash;
506                 }
507
508         md_size=EVP_MD_size(hash);
509         npad=(48/md_size)*md_size;
510
511         /* Chop the digest off the end :-) */
512         EVP_MD_CTX_init(&md_ctx);
513
514         EVP_DigestInit(  &md_ctx,hash);
515         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
516         EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
517         EVP_DigestUpdate(&md_ctx,seq,8);
518         rec_char=rec->type;
519         EVP_DigestUpdate(&md_ctx,&rec_char,1);
520         p=md;
521         s2n(rec->length,p);
522         EVP_DigestUpdate(&md_ctx,md,2);
523         EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
524         EVP_DigestFinal( &md_ctx,md,NULL);
525
526         EVP_DigestInit(  &md_ctx,hash);
527         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
528         EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
529         EVP_DigestUpdate(&md_ctx,md,md_size);
530         EVP_DigestFinal( &md_ctx,md,&md_size);
531
532         EVP_MD_CTX_cleanup(&md_ctx);
533
534         for (i=7; i>=0; i--)
535                 {
536                 ++seq[i];
537                 if (seq[i] != 0) break; 
538                 }
539
540         return(md_size);
541         }
542
543 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
544              int len)
545         {
546         static const unsigned char *salt[3]={
547 #ifndef CHARSET_EBCDIC
548                 (const unsigned char *)"A",
549                 (const unsigned char *)"BB",
550                 (const unsigned char *)"CCC",
551 #else
552                 (const unsigned char *)"\x41",
553                 (const unsigned char *)"\x42\x42",
554                 (const unsigned char *)"\x43\x43\x43",
555 #endif
556                 };
557         unsigned char buf[EVP_MAX_MD_SIZE];
558         EVP_MD_CTX ctx;
559         int i,ret=0;
560         unsigned int n;
561
562         EVP_MD_CTX_init(&ctx);
563         for (i=0; i<3; i++)
564                 {
565                 EVP_DigestInit(&ctx,s->ctx->sha1);
566                 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
567                 EVP_DigestUpdate(&ctx,p,len);
568                 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
569                         SSL3_RANDOM_SIZE);
570                 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
571                         SSL3_RANDOM_SIZE);
572                 EVP_DigestFinal(&ctx,buf,&n);
573
574                 EVP_DigestInit(&ctx,s->ctx->md5);
575                 EVP_DigestUpdate(&ctx,p,len);
576                 EVP_DigestUpdate(&ctx,buf,n);
577                 EVP_DigestFinal(&ctx,out,&n);
578                 out+=n;
579                 ret+=n;
580                 }
581         EVP_MD_CTX_cleanup(&ctx);
582         return(ret);
583         }
584
585 int ssl3_alert_code(int code)
586         {
587         switch (code)
588                 {
589         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
590         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
591         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
592         case SSL_AD_DECRYPTION_FAILED:  return(SSL3_AD_BAD_RECORD_MAC);
593         case SSL_AD_RECORD_OVERFLOW:    return(SSL3_AD_BAD_RECORD_MAC);
594         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
595         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
596         case SSL_AD_NO_CERTIFICATE:     return(SSL3_AD_NO_CERTIFICATE);
597         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
598         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
599         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
600         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
601         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
602         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
603         case SSL_AD_UNKNOWN_CA:         return(SSL3_AD_BAD_CERTIFICATE);
604         case SSL_AD_ACCESS_DENIED:      return(SSL3_AD_HANDSHAKE_FAILURE);
605         case SSL_AD_DECODE_ERROR:       return(SSL3_AD_HANDSHAKE_FAILURE);
606         case SSL_AD_DECRYPT_ERROR:      return(SSL3_AD_HANDSHAKE_FAILURE);
607         case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE);
608         case SSL_AD_PROTOCOL_VERSION:   return(SSL3_AD_HANDSHAKE_FAILURE);
609         case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
610         case SSL_AD_INTERNAL_ERROR:     return(SSL3_AD_HANDSHAKE_FAILURE);
611         case SSL_AD_USER_CANCELLED:     return(SSL3_AD_HANDSHAKE_FAILURE);
612         case SSL_AD_NO_RENEGOTIATION:   return(-1); /* Don't send it :-) */
613         default:                        return(-1);
614                 }
615         }
616