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