8cd36a395c8b5fe4f89672c1801a04f3dc2f4b86
[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/md5.h>
61 #include <openssl/sha.h>
62 #include <openssl/evp.h>
63 #include "ssl_locl.h"
64
65 static unsigned char ssl3_pad_1[48]={
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         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36 };
72
73 static unsigned char ssl3_pad_2[48]={
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         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c };
80
81 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
82         const char *sender, int len, unsigned char *p);
83
84 static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num)
85         {
86         MD5_CTX m5;
87         SHA_CTX s1;
88         unsigned char buf[16],smd[SHA_DIGEST_LENGTH];
89         unsigned char c='A';
90         int i,j,k;
91
92 #ifdef CHARSET_EBCDIC
93         c = os_toascii[c]; /*'A' in ASCII */
94 #endif
95         k=0;
96         for (i=0; i<num; i+=MD5_DIGEST_LENGTH)
97                 {
98                 k++;
99                 if (k > sizeof buf)
100                         {
101                         /* bug: 'buf' is too small for this ciphersuite */
102                         SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);
103                         return 0;
104                         }
105                 
106                 for (j=0; j<k; j++)
107                         buf[j]=c;
108                 c++;
109                 SHA1_Init(  &s1);
110                 SHA1_Update(&s1,buf,k);
111                 SHA1_Update(&s1,s->session->master_key,
112                         s->session->master_key_length);
113                 SHA1_Update(&s1,s->s3->server_random,SSL3_RANDOM_SIZE);
114                 SHA1_Update(&s1,s->s3->client_random,SSL3_RANDOM_SIZE);
115                 SHA1_Final( smd,&s1);
116
117                 MD5_Init(  &m5);
118                 MD5_Update(&m5,s->session->master_key,
119                         s->session->master_key_length);
120                 MD5_Update(&m5,smd,SHA_DIGEST_LENGTH);
121                 if ((i+MD5_DIGEST_LENGTH) > num)
122                         {
123                         MD5_Final(smd,&m5);
124                         memcpy(km,smd,(num-i));
125                         }
126                 else
127                         MD5_Final(km,&m5);
128
129                 km+=MD5_DIGEST_LENGTH;
130                 }
131         memset(smd,0,SHA_DIGEST_LENGTH);
132         return 1;
133         }
134
135 int ssl3_change_cipher_state(SSL *s, int which)
136         {
137         unsigned char *p,*key_block,*mac_secret;
138         unsigned char exp_key[EVP_MAX_KEY_LENGTH];
139         unsigned char exp_iv[EVP_MAX_KEY_LENGTH];
140         unsigned char *ms,*key,*iv,*er1,*er2;
141         EVP_CIPHER_CTX *dd;
142         const EVP_CIPHER *c;
143         COMP_METHOD *comp;
144         const EVP_MD *m;
145         MD5_CTX md;
146         int exp,n,i,j,k,cl;
147
148         exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
149         c=s->s3->tmp.new_sym_enc;
150         m=s->s3->tmp.new_hash;
151         if (s->s3->tmp.new_compression == NULL)
152                 comp=NULL;
153         else
154                 comp=s->s3->tmp.new_compression->method;
155         key_block=s->s3->tmp.key_block;
156
157         if (which & SSL3_CC_READ)
158                 {
159                 if ((s->enc_read_ctx == NULL) &&
160                         ((s->enc_read_ctx=(EVP_CIPHER_CTX *)
161                         OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
162                         goto err;
163                 dd= s->enc_read_ctx;
164                 s->read_hash=m;
165                 /* COMPRESS */
166                 if (s->expand != NULL)
167                         {
168                         COMP_CTX_free(s->expand);
169                         s->expand=NULL;
170                         }
171                 if (comp != NULL)
172                         {
173                         s->expand=COMP_CTX_new(comp);
174                         if (s->expand == NULL)
175                                 {
176                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
177                                 goto err2;
178                                 }
179                         if (s->s3->rrec.comp == NULL)
180                                 s->s3->rrec.comp=(unsigned char *)
181                                         OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);
182                         if (s->s3->rrec.comp == NULL)
183                                 goto err;
184                         }
185                 memset(&(s->s3->read_sequence[0]),0,8);
186                 mac_secret= &(s->s3->read_mac_secret[0]);
187                 }
188         else
189                 {
190                 if ((s->enc_write_ctx == NULL) &&
191                         ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
192                         OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
193                         goto err;
194                 dd= s->enc_write_ctx;
195                 s->write_hash=m;
196                 /* COMPRESS */
197                 if (s->compress != NULL)
198                         {
199                         COMP_CTX_free(s->compress);
200                         s->compress=NULL;
201                         }
202                 if (comp != NULL)
203                         {
204                         s->compress=COMP_CTX_new(comp);
205                         if (s->compress == NULL)
206                                 {
207                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
208                                 goto err2;
209                                 }
210                         }
211                 memset(&(s->s3->write_sequence[0]),0,8);
212                 mac_secret= &(s->s3->write_mac_secret[0]);
213                 }
214
215         EVP_CIPHER_CTX_init(dd);
216
217         p=s->s3->tmp.key_block;
218         i=EVP_MD_size(m);
219         cl=EVP_CIPHER_key_length(c);
220         j=exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
221                  cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
222         /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
223         k=EVP_CIPHER_iv_length(c);
224         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
225                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
226                 {
227                 ms=  &(p[ 0]); n=i+i;
228                 key= &(p[ n]); n+=j+j;
229                 iv=  &(p[ n]); n+=k+k;
230                 er1= &(s->s3->client_random[0]);
231                 er2= &(s->s3->server_random[0]);
232                 }
233         else
234                 {
235                 n=i;
236                 ms=  &(p[ n]); n+=i+j;
237                 key= &(p[ n]); n+=j+k;
238                 iv=  &(p[ n]); n+=k;
239                 er1= &(s->s3->server_random[0]);
240                 er2= &(s->s3->client_random[0]);
241                 }
242
243         if (n > s->s3->tmp.key_block_length)
244                 {
245                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
246                 goto err2;
247                 }
248
249         memcpy(mac_secret,ms,i);
250         if (exp)
251                 {
252                 /* In here I set both the read and write key/iv to the
253                  * same value since only the correct one will be used :-).
254                  */
255                 MD5_Init(&md);
256                 MD5_Update(&md,key,j);
257                 MD5_Update(&md,er1,SSL3_RANDOM_SIZE);
258                 MD5_Update(&md,er2,SSL3_RANDOM_SIZE);
259                 MD5_Final(&(exp_key[0]),&md);
260                 key= &(exp_key[0]);
261
262                 if (k > 0)
263                         {
264                         MD5_Init(&md);
265                         MD5_Update(&md,er1,SSL3_RANDOM_SIZE);
266                         MD5_Update(&md,er2,SSL3_RANDOM_SIZE);
267                         MD5_Final(&(exp_iv[0]),&md);
268                         iv= &(exp_iv[0]);
269                         }
270                 }
271
272         s->session->key_arg_length=0;
273
274         EVP_CipherInit(dd,c,key,iv,(which & SSL3_CC_WRITE));
275
276         memset(&(exp_key[0]),0,sizeof(exp_key));
277         memset(&(exp_iv[0]),0,sizeof(exp_iv));
278         return(1);
279 err:
280         SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
281 err2:
282         return(0);
283         }
284
285 int ssl3_setup_key_block(SSL *s)
286         {
287         unsigned char *p;
288         const EVP_CIPHER *c;
289         const EVP_MD *hash;
290         int num;
291         SSL_COMP *comp;
292
293         if (s->s3->tmp.key_block_length != 0)
294                 return(1);
295
296         if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
297                 {
298                 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
299                 return(0);
300                 }
301
302         s->s3->tmp.new_sym_enc=c;
303         s->s3->tmp.new_hash=hash;
304         s->s3->tmp.new_compression=comp;
305
306         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
307         num*=2;
308
309         ssl3_cleanup_key_block(s);
310
311         if ((p=OPENSSL_malloc(num)) == NULL)
312                 goto err;
313
314         s->s3->tmp.key_block_length=num;
315         s->s3->tmp.key_block=p;
316
317         return ssl3_generate_key_block(s,p,num);
318
319 err:
320         SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
321         return(0);
322         }
323
324 void ssl3_cleanup_key_block(SSL *s)
325         {
326         if (s->s3->tmp.key_block != NULL)
327                 {
328                 memset(s->s3->tmp.key_block,0,
329                         s->s3->tmp.key_block_length);
330                 OPENSSL_free(s->s3->tmp.key_block);
331                 s->s3->tmp.key_block=NULL;
332                 }
333         s->s3->tmp.key_block_length=0;
334         }
335
336 int ssl3_enc(SSL *s, int send)
337         {
338         SSL3_RECORD *rec;
339         EVP_CIPHER_CTX *ds;
340         unsigned long l;
341         int bs,i;
342         const EVP_CIPHER *enc;
343
344         if (send)
345                 {
346                 ds=s->enc_write_ctx;
347                 rec= &(s->s3->wrec);
348                 if (s->enc_write_ctx == NULL)
349                         enc=NULL;
350                 else
351                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
352                 }
353         else
354                 {
355                 ds=s->enc_read_ctx;
356                 rec= &(s->s3->rrec);
357                 if (s->enc_read_ctx == NULL)
358                         enc=NULL;
359                 else
360                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
361                 }
362
363         if ((s->session == NULL) || (ds == NULL) ||
364                 (enc == NULL))
365                 {
366                 memmove(rec->data,rec->input,rec->length);
367                 rec->input=rec->data;
368                 }
369         else
370                 {
371                 l=rec->length;
372                 bs=EVP_CIPHER_block_size(ds->cipher);
373
374                 /* COMPRESS */
375
376                 /* This should be using (bs-1) and bs instead of 7 and 8 */
377                 if ((bs != 1) && send)
378                         {
379                         i=bs-((int)l%bs);
380
381                         /* we need to add 'i-1' padding bytes */
382                         l+=i;
383                         rec->length+=i;
384                         rec->input[l-1]=(i-1);
385                         }
386
387                 EVP_Cipher(ds,rec->data,rec->input,l);
388
389                 if ((bs != 1) && !send)
390                         {
391                         i=rec->data[l-1]+1;
392                         if (i > bs)
393                                 {
394                                 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
395                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPT_ERROR);
396                                 return(0);
397                                 }
398                         rec->length-=i;
399                         }
400                 }
401         return(1);
402         }
403
404 void ssl3_init_finished_mac(SSL *s)
405         {
406         EVP_DigestInit(&(s->s3->finish_dgst1),s->ctx->md5);
407         EVP_DigestInit(&(s->s3->finish_dgst2),s->ctx->sha1);
408         }
409
410 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
411         {
412         EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);
413         EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);
414         }
415
416 int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p)
417         {
418         return(ssl3_handshake_mac(s,ctx,NULL,0,p));
419         }
420
421 int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2,
422              const char *sender, int len, unsigned char *p)
423         {
424         int ret;
425
426         ret=ssl3_handshake_mac(s,ctx1,sender,len,p);
427         p+=ret;
428         ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);
429         return(ret);
430         }
431
432 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
433              const char *sender, int len, unsigned char *p)
434         {
435         unsigned int ret;
436         int npad,n;
437         unsigned int i;
438         unsigned char md_buf[EVP_MAX_MD_SIZE];
439         EVP_MD_CTX ctx;
440
441         EVP_MD_CTX_copy(&ctx,in_ctx);
442
443         n=EVP_MD_CTX_size(&ctx);
444         npad=(48/n)*n;
445
446         if (sender != NULL)
447                 EVP_DigestUpdate(&ctx,sender,len);
448         EVP_DigestUpdate(&ctx,s->session->master_key,
449                 s->session->master_key_length);
450         EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
451         EVP_DigestFinal(&ctx,md_buf,&i);
452
453         EVP_DigestInit(&ctx,EVP_MD_CTX_md(&ctx));
454         EVP_DigestUpdate(&ctx,s->session->master_key,
455                 s->session->master_key_length);
456         EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
457         EVP_DigestUpdate(&ctx,md_buf,i);
458         EVP_DigestFinal(&ctx,p,&ret);
459
460         memset(&ctx,0,sizeof(EVP_MD_CTX));
461
462         return((int)ret);
463         }
464
465 int ssl3_mac(SSL *ssl, unsigned char *md, int send)
466         {
467         SSL3_RECORD *rec;
468         unsigned char *mac_sec,*seq;
469         EVP_MD_CTX md_ctx;
470         const EVP_MD *hash;
471         unsigned char *p,rec_char;
472         unsigned int md_size;
473         int npad,i;
474
475         if (send)
476                 {
477                 rec= &(ssl->s3->wrec);
478                 mac_sec= &(ssl->s3->write_mac_secret[0]);
479                 seq= &(ssl->s3->write_sequence[0]);
480                 hash=ssl->write_hash;
481                 }
482         else
483                 {
484                 rec= &(ssl->s3->rrec);
485                 mac_sec= &(ssl->s3->read_mac_secret[0]);
486                 seq= &(ssl->s3->read_sequence[0]);
487                 hash=ssl->read_hash;
488                 }
489
490         md_size=EVP_MD_size(hash);
491         npad=(48/md_size)*md_size;
492
493         /* Chop the digest off the end :-) */
494
495         EVP_DigestInit(  &md_ctx,hash);
496         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
497         EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
498         EVP_DigestUpdate(&md_ctx,seq,8);
499         rec_char=rec->type;
500         EVP_DigestUpdate(&md_ctx,&rec_char,1);
501         p=md;
502         s2n(rec->length,p);
503         EVP_DigestUpdate(&md_ctx,md,2);
504         EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
505         EVP_DigestFinal( &md_ctx,md,NULL);
506
507         EVP_DigestInit(  &md_ctx,hash);
508         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
509         EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
510         EVP_DigestUpdate(&md_ctx,md,md_size);
511         EVP_DigestFinal( &md_ctx,md,&md_size);
512
513         for (i=7; i>=0; i--)
514                 {
515                 ++seq[i];
516                 if (seq[i] != 0) break; 
517                 }
518
519         return(md_size);
520         }
521
522 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
523              int len)
524         {
525         static const unsigned char *salt[3]={
526 #ifndef CHARSET_EBCDIC
527                 (const unsigned char *)"A",
528                 (const unsigned char *)"BB",
529                 (const unsigned char *)"CCC",
530 #else
531                 (const unsigned char *)"\x41",
532                 (const unsigned char *)"\x42\x42",
533                 (const unsigned char *)"\x43\x43\x43",
534 #endif
535                 };
536         unsigned char buf[EVP_MAX_MD_SIZE];
537         EVP_MD_CTX ctx;
538         int i,ret=0;
539         unsigned int n;
540
541         for (i=0; i<3; i++)
542                 {
543                 EVP_DigestInit(&ctx,s->ctx->sha1);
544                 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
545                 EVP_DigestUpdate(&ctx,p,len);
546                 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
547                         SSL3_RANDOM_SIZE);
548                 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
549                         SSL3_RANDOM_SIZE);
550                 EVP_DigestFinal(&ctx,buf,&n);
551
552                 EVP_DigestInit(&ctx,s->ctx->md5);
553                 EVP_DigestUpdate(&ctx,p,len);
554                 EVP_DigestUpdate(&ctx,buf,n);
555                 EVP_DigestFinal(&ctx,out,&n);
556                 out+=n;
557                 ret+=n;
558                 }
559         return(ret);
560         }
561
562 int ssl3_alert_code(int code)
563         {
564         switch (code)
565                 {
566         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
567         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
568         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
569         case SSL_AD_DECRYPTION_FAILED:  return(SSL3_AD_BAD_RECORD_MAC);
570         case SSL_AD_RECORD_OVERFLOW:    return(SSL3_AD_BAD_RECORD_MAC);
571         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
572         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
573         case SSL_AD_NO_CERTIFICATE:     return(SSL3_AD_NO_CERTIFICATE);
574         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
575         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
576         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
577         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
578         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
579         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
580         case SSL_AD_UNKNOWN_CA:         return(SSL3_AD_BAD_CERTIFICATE);
581         case SSL_AD_ACCESS_DENIED:      return(SSL3_AD_HANDSHAKE_FAILURE);
582         case SSL_AD_DECODE_ERROR:       return(SSL3_AD_HANDSHAKE_FAILURE);
583         case SSL_AD_DECRYPT_ERROR:      return(SSL3_AD_HANDSHAKE_FAILURE);
584         case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE);
585         case SSL_AD_PROTOCOL_VERSION:   return(SSL3_AD_HANDSHAKE_FAILURE);
586         case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
587         case SSL_AD_INTERNAL_ERROR:     return(SSL3_AD_HANDSHAKE_FAILURE);
588         case SSL_AD_USER_CANCELLED:     return(SSL3_AD_HANDSHAKE_FAILURE);
589         case SSL_AD_NO_RENEGOTIATION:   return(-1); /* Don't send it :-) */
590         default:                        return(-1);
591                 }
592         }
593