Continued multibyte character support.
[openssl.git] / ssl / ssl_ciph.c
1 /* ssl/ssl_ciph.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/objects.h>
61 #include <openssl/comp.h>
62 #include "ssl_locl.h"
63
64 #define SSL_ENC_DES_IDX         0
65 #define SSL_ENC_3DES_IDX        1
66 #define SSL_ENC_RC4_IDX         2
67 #define SSL_ENC_RC2_IDX         3
68 #define SSL_ENC_IDEA_IDX        4
69 #define SSL_ENC_eFZA_IDX        5
70 #define SSL_ENC_NULL_IDX        6
71 #define SSL_ENC_NUM_IDX         7
72
73 static const EVP_CIPHER *ssl_cipher_methods[SSL_ENC_NUM_IDX]={
74         NULL,NULL,NULL,NULL,NULL,NULL,
75         };
76
77 static STACK_OF(SSL_COMP) *ssl_comp_methods=NULL;
78
79 #define SSL_MD_MD5_IDX  0
80 #define SSL_MD_SHA1_IDX 1
81 #define SSL_MD_NUM_IDX  2
82 static const EVP_MD *ssl_digest_methods[SSL_MD_NUM_IDX]={
83         NULL,NULL,
84         };
85
86 typedef struct cipher_sort_st
87         {
88         SSL_CIPHER *cipher;
89         int pref;
90         } CIPHER_SORT;
91
92 #define CIPHER_ADD      1
93 #define CIPHER_KILL     2
94 #define CIPHER_DEL      3
95 #define CIPHER_ORD      4
96
97 typedef struct cipher_choice_st
98         {
99         int type;
100         unsigned long algorithms;
101         unsigned long mask;
102         long top;
103         } CIPHER_CHOICE;
104
105 typedef struct cipher_order_st
106         {
107         SSL_CIPHER *cipher;
108         int active;
109         int dead;
110         struct cipher_order_st *next,*prev;
111         } CIPHER_ORDER;
112
113 static SSL_CIPHER cipher_aliases[]={
114         /* Don't include eNULL unless specifically enabled */
115         {0,SSL_TXT_ALL, 0,SSL_ALL & ~SSL_eNULL, 0,SSL_ALL}, /* must be first */
116         {0,SSL_TXT_kRSA,0,SSL_kRSA,  0,SSL_MKEY_MASK},
117         {0,SSL_TXT_kDHr,0,SSL_kDHr,  0,SSL_MKEY_MASK},
118         {0,SSL_TXT_kDHd,0,SSL_kDHd,  0,SSL_MKEY_MASK},
119         {0,SSL_TXT_kEDH,0,SSL_kEDH,  0,SSL_MKEY_MASK},
120         {0,SSL_TXT_kFZA,0,SSL_kFZA,  0,SSL_MKEY_MASK},
121         {0,SSL_TXT_DH,  0,SSL_DH,    0,SSL_MKEY_MASK},
122         {0,SSL_TXT_EDH, 0,SSL_EDH,   0,SSL_MKEY_MASK|SSL_AUTH_MASK},
123
124         {0,SSL_TXT_aRSA,0,SSL_aRSA,  0,SSL_AUTH_MASK},
125         {0,SSL_TXT_aDSS,0,SSL_aDSS,  0,SSL_AUTH_MASK},
126         {0,SSL_TXT_aFZA,0,SSL_aFZA,  0,SSL_AUTH_MASK},
127         {0,SSL_TXT_aNULL,0,SSL_aNULL,0,SSL_AUTH_MASK},
128         {0,SSL_TXT_aDH, 0,SSL_aDH,   0,SSL_AUTH_MASK},
129         {0,SSL_TXT_DSS, 0,SSL_DSS,   0,SSL_AUTH_MASK},
130
131         {0,SSL_TXT_DES, 0,SSL_DES,   0,SSL_ENC_MASK},
132         {0,SSL_TXT_3DES,0,SSL_3DES,  0,SSL_ENC_MASK},
133         {0,SSL_TXT_RC4, 0,SSL_RC4,   0,SSL_ENC_MASK},
134         {0,SSL_TXT_RC2, 0,SSL_RC2,   0,SSL_ENC_MASK},
135         {0,SSL_TXT_IDEA,0,SSL_IDEA,  0,SSL_ENC_MASK},
136         {0,SSL_TXT_eNULL,0,SSL_eNULL,0,SSL_ENC_MASK},
137         {0,SSL_TXT_eFZA,0,SSL_eFZA,  0,SSL_ENC_MASK},
138
139         {0,SSL_TXT_MD5, 0,SSL_MD5,   0,SSL_MAC_MASK},
140         {0,SSL_TXT_SHA1,0,SSL_SHA1,  0,SSL_MAC_MASK},
141         {0,SSL_TXT_SHA, 0,SSL_SHA,   0,SSL_MAC_MASK},
142
143         {0,SSL_TXT_NULL,0,SSL_NULL,  0,SSL_ENC_MASK},
144         {0,SSL_TXT_RSA, 0,SSL_RSA,   0,SSL_AUTH_MASK|SSL_MKEY_MASK},
145         {0,SSL_TXT_ADH, 0,SSL_ADH,   0,SSL_AUTH_MASK|SSL_MKEY_MASK},
146         {0,SSL_TXT_FZA, 0,SSL_FZA,   0,SSL_AUTH_MASK|SSL_MKEY_MASK|SSL_ENC_MASK},
147
148         {0,SSL_TXT_EXP40, 0,SSL_EXP40, 0,SSL_EXP_MASK},
149         {0,SSL_TXT_EXPORT,0,SSL_EXP40, 0,SSL_EXP_MASK},
150         {0,SSL_TXT_EXP56, 0,SSL_EXP56, 0,SSL_EXP_MASK},
151         {0,SSL_TXT_SSLV2, 0,SSL_SSLV2, 0,SSL_SSL_MASK},
152         {0,SSL_TXT_SSLV3, 0,SSL_SSLV3, 0,SSL_SSL_MASK},
153         {0,SSL_TXT_TLSV1, 0,SSL_TLSV1, 0,SSL_SSL_MASK},
154         {0,SSL_TXT_LOW,   0,SSL_LOW,   0,SSL_STRONG_MASK},
155         {0,SSL_TXT_MEDIUM,0,SSL_MEDIUM,0,SSL_STRONG_MASK},
156         {0,SSL_TXT_HIGH,  0,SSL_HIGH,  0,SSL_STRONG_MASK},
157         };
158
159 static int init_ciphers=1;
160 static void load_ciphers();
161
162 static int cmp_by_name(SSL_CIPHER **a, SSL_CIPHER **b)
163         {
164         return(strcmp((*a)->name,(*b)->name));
165         }
166
167 static void load_ciphers(void)
168         {
169         init_ciphers=0;
170         ssl_cipher_methods[SSL_ENC_DES_IDX]= 
171                 EVP_get_cipherbyname(SN_des_cbc);
172         ssl_cipher_methods[SSL_ENC_3DES_IDX]=
173                 EVP_get_cipherbyname(SN_des_ede3_cbc);
174         ssl_cipher_methods[SSL_ENC_RC4_IDX]=
175                 EVP_get_cipherbyname(SN_rc4);
176         ssl_cipher_methods[SSL_ENC_RC2_IDX]= 
177                 EVP_get_cipherbyname(SN_rc2_cbc);
178         ssl_cipher_methods[SSL_ENC_IDEA_IDX]= 
179                 EVP_get_cipherbyname(SN_idea_cbc);
180
181         ssl_digest_methods[SSL_MD_MD5_IDX]=
182                 EVP_get_digestbyname(SN_md5);
183         ssl_digest_methods[SSL_MD_SHA1_IDX]=
184                 EVP_get_digestbyname(SN_sha1);
185         }
186
187 int ssl_cipher_get_evp(SSL_SESSION *s, const EVP_CIPHER **enc,
188              const EVP_MD **md, SSL_COMP **comp)
189         {
190         int i;
191         SSL_CIPHER *c;
192
193         c=s->cipher;
194         if (c == NULL) return(0);
195         if (comp != NULL)
196                 {
197                 SSL_COMP ctmp;
198
199                 if (s->compress_meth == 0)
200                         *comp=NULL;
201                 else if (ssl_comp_methods == NULL)
202                         {
203                         /* bad */
204                         *comp=NULL;
205                         }
206                 else
207                         {
208
209                         ctmp.id=s->compress_meth;
210                         i=sk_SSL_COMP_find(ssl_comp_methods,&ctmp);
211                         if (i >= 0)
212                                 *comp=sk_SSL_COMP_value(ssl_comp_methods,i);
213                         else
214                                 *comp=NULL;
215                         }
216                 }
217
218         if ((enc == NULL) || (md == NULL)) return(0);
219
220         switch (c->algorithms & SSL_ENC_MASK)
221                 {
222         case SSL_DES:
223                 i=SSL_ENC_DES_IDX;
224                 break;
225         case SSL_3DES:
226                 i=SSL_ENC_3DES_IDX;
227                 break;
228         case SSL_RC4:
229                 i=SSL_ENC_RC4_IDX;
230                 break;
231         case SSL_RC2:
232                 i=SSL_ENC_RC2_IDX;
233                 break;
234         case SSL_IDEA:
235                 i=SSL_ENC_IDEA_IDX;
236                 break;
237         case SSL_eNULL:
238                 i=SSL_ENC_NULL_IDX;
239                 break;
240         default:
241                 i= -1;
242                 break;
243                 }
244
245         if ((i < 0) || (i > SSL_ENC_NUM_IDX))
246                 *enc=NULL;
247         else
248                 {
249                 if (i == SSL_ENC_NULL_IDX)
250                         *enc=EVP_enc_null();
251                 else
252                         *enc=ssl_cipher_methods[i];
253                 }
254
255         switch (c->algorithms & SSL_MAC_MASK)
256                 {
257         case SSL_MD5:
258                 i=SSL_MD_MD5_IDX;
259                 break;
260         case SSL_SHA1:
261                 i=SSL_MD_SHA1_IDX;
262                 break;
263         default:
264                 i= -1;
265                 break;
266                 }
267         if ((i < 0) || (i > SSL_MD_NUM_IDX))
268                 *md=NULL;
269         else
270                 *md=ssl_digest_methods[i];
271
272         if ((*enc != NULL) && (*md != NULL))
273                 return(1);
274         else
275                 return(0);
276         }
277
278 #define ITEM_SEP(a) \
279         (((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ','))
280
281 static void ll_append_tail(CIPHER_ORDER **head, CIPHER_ORDER *curr,
282              CIPHER_ORDER **tail)
283         {
284         if (curr == *tail) return;
285         if (curr == *head)
286                 *head=curr->next;
287         if (curr->prev != NULL)
288                 curr->prev->next=curr->next;
289         if (curr->next != NULL) /* should always be true */
290                 curr->next->prev=curr->prev;
291         (*tail)->next=curr;
292         curr->prev= *tail;
293         curr->next=NULL;
294         *tail=curr;
295         }
296
297 STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(SSL_METHOD *ssl_method,
298                 STACK_OF(SSL_CIPHER) **cipher_list,
299                 STACK_OF(SSL_CIPHER) **cipher_list_by_id,
300                 char *str)
301         {
302         SSL_CIPHER *c;
303         char *l;
304         STACK_OF(SSL_CIPHER) *ret=NULL,*ok=NULL;
305 #define CL_BUF  40
306         char buf[CL_BUF];
307         char *tmp_str=NULL;
308         unsigned long mask,algorithms,ma;
309         char *start;
310         int i,j,k,num=0,ch,multi;
311         unsigned long al;
312         STACK *ca_list=NULL;
313         int current_x,num_x;
314         CIPHER_CHOICE *ops=NULL;
315         CIPHER_ORDER *list=NULL,*head=NULL,*tail=NULL,*curr,*tail2,*curr2;
316         int list_num;
317         int type;
318         SSL_CIPHER c_tmp,*cp;
319
320         if (str == NULL) return(NULL);
321
322         if (strncmp(str,"DEFAULT",7) == 0)
323                 {
324                 i=strlen(str)+2+strlen(SSL_DEFAULT_CIPHER_LIST);
325                 if ((tmp_str=Malloc(i)) == NULL)
326                         {
327                         SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
328                         goto err;
329                         }
330                 strcpy(tmp_str,SSL_DEFAULT_CIPHER_LIST);
331                 strcat(tmp_str,":");
332                 strcat(tmp_str,&(str[7]));
333                 str=tmp_str;
334                 }
335         if (init_ciphers) load_ciphers();
336
337         num=ssl_method->num_ciphers();
338
339         if ((ret=sk_SSL_CIPHER_new(NULL)) == NULL) goto err;
340         if ((ca_list=(STACK *)sk_new(cmp_by_name)) == NULL) goto err;
341
342         mask =SSL_kFZA;
343 #ifdef NO_RSA
344         mask|=SSL_aRSA|SSL_kRSA;
345 #endif
346 #ifdef NO_DSA
347         mask|=SSL_aDSS;
348 #endif
349 #ifdef NO_DH
350         mask|=SSL_kDHr|SSL_kDHd|SSL_kEDH|SSL_aDH;
351 #endif
352
353 #ifdef SSL_FORBID_ENULL
354         mask|=SSL_eNULL;
355 #endif
356
357         mask|=(ssl_cipher_methods[SSL_ENC_DES_IDX ] == NULL)?SSL_DES :0;
358         mask|=(ssl_cipher_methods[SSL_ENC_3DES_IDX] == NULL)?SSL_3DES:0;
359         mask|=(ssl_cipher_methods[SSL_ENC_RC4_IDX ] == NULL)?SSL_RC4 :0;
360         mask|=(ssl_cipher_methods[SSL_ENC_RC2_IDX ] == NULL)?SSL_RC2 :0;
361         mask|=(ssl_cipher_methods[SSL_ENC_IDEA_IDX] == NULL)?SSL_IDEA:0;
362         mask|=(ssl_cipher_methods[SSL_ENC_eFZA_IDX] == NULL)?SSL_eFZA:0;
363
364         mask|=(ssl_digest_methods[SSL_MD_MD5_IDX ] == NULL)?SSL_MD5 :0;
365         mask|=(ssl_digest_methods[SSL_MD_SHA1_IDX] == NULL)?SSL_SHA1:0;
366
367         if ((list=(CIPHER_ORDER *)Malloc(sizeof(CIPHER_ORDER)*num)) == NULL)
368                 goto err;
369
370         /* Get the initial list of ciphers */
371         list_num=0;
372         for (i=0; i<num; i++)
373                 {
374                 c=ssl_method->get_cipher((unsigned int)i);
375                 /* drop those that use any of that is not available */
376                 if ((c != NULL) && c->valid && !(c->algorithms & mask))
377                         {
378                         list[list_num].cipher=c;
379                         list[list_num].next=NULL;
380                         list[list_num].prev=NULL;
381                         list[list_num].active=0;
382                         list_num++;
383                         if (!sk_push(ca_list,(char *)c)) goto err;
384                         }
385                 }
386         
387         for (i=1; i<list_num-1; i++)
388                 {
389                 list[i].prev= &(list[i-1]);
390                 list[i].next= &(list[i+1]);
391                 }
392         if (list_num > 0)
393                 {
394                 head= &(list[0]);
395                 head->prev=NULL;
396                 head->next= &(list[1]);
397                 tail= &(list[list_num-1]);
398                 tail->prev= &(list[list_num-2]);
399                 tail->next=NULL;
400                 }
401
402         /* special case */
403         cipher_aliases[0].algorithms &= ~mask;
404
405         /* get the aliases */
406         k=sizeof(cipher_aliases)/sizeof(SSL_CIPHER);
407         for (j=0; j<k; j++)
408                 {
409                 al=cipher_aliases[j].algorithms;
410                 /* Drop those that are not relevent */
411                 if ((al & mask) == al) continue;
412                 if (!sk_push(ca_list,(char *)&(cipher_aliases[j]))) goto err;
413                 }
414
415         /* ca_list now holds a 'stack' of SSL_CIPHERS, some real, some
416          * 'aliases' */
417
418         /* how many parameters are there? */
419         num=1;
420         for (l=str; *l; l++)
421                 if (ITEM_SEP(*l))
422                         num++;
423         ops=(CIPHER_CHOICE *)Malloc(sizeof(CIPHER_CHOICE)*num);
424         if (ops == NULL) goto err;
425         memset(ops,0,sizeof(CIPHER_CHOICE)*num);
426
427         /* we now parse the input string and create our operations */
428         l=str;
429         i=0;
430         current_x=0;
431
432         for (;;)
433                 {
434                 ch= *l;
435
436                 if (ch == '\0') break;
437
438                 if (ch == '-')
439                         { j=CIPHER_DEL; l++; }
440                 else if (ch == '+')
441                         { j=CIPHER_ORD; l++; }
442                 else if (ch == '!')
443                         { j=CIPHER_KILL; l++; }
444                 else    
445                         { j=CIPHER_ADD; }
446
447                 if (ITEM_SEP(ch))
448                         {
449                         l++;
450                         continue;
451                         }
452                 ops[current_x].type=j;
453                 ops[current_x].algorithms=0;
454                 ops[current_x].mask=0;
455
456                 start=l;
457                 for (;;)
458                         {
459                         ch= *l;
460                         i=0;
461 #ifndef CHARSET_EBCDIC
462                         while ( ((ch >= 'A') && (ch <= 'Z')) ||
463                                 ((ch >= '0') && (ch <= '9')) ||
464                                 ((ch >= 'a') && (ch <= 'z')) ||
465                                  (ch == '-'))
466 #else
467                         while ( isalnum(ch) || (ch == '-'))
468 #endif
469                                  {
470                                  buf[i]=ch;
471                                  ch= *(++l);
472                                  i++;
473                                  if (i >= (CL_BUF-2)) break;
474                                  }
475                         buf[i]='\0';
476
477                         /* check for multi-part specification */
478                         if (ch == '+')
479                                 {
480                                 multi=1;
481                                 l++;
482                                 }
483                         else
484                                 multi=0;
485
486                         c_tmp.name=buf;
487                         j=sk_find(ca_list,(char *)&c_tmp);
488                         if (j < 0)
489                                 goto end_loop;
490
491                         cp=(SSL_CIPHER *)sk_value(ca_list,j);
492                         ops[current_x].algorithms|=cp->algorithms;
493                         /* We add the SSL_SSL_MASK so we can match the
494                          * SSLv2 and SSLv3 versions of RC4-MD5 */
495                         ops[current_x].mask|=cp->mask;
496                         if (!multi) break;
497                         }
498                 current_x++;
499                 if (ch == '\0') break;
500 end_loop:
501                 /* Make sure we scan until the next valid start point */
502                 while ((*l != '\0') && ITEM_SEP(*l))
503                         l++;
504                 }
505
506         num_x=current_x;
507         current_x=0;
508
509         /* We will now process the list of ciphers, once for each category, to
510          * decide what we should do with it. */
511         for (j=0; j<num_x; j++)
512                 {
513                 algorithms=ops[j].algorithms;
514                 type=ops[j].type;
515                 mask=ops[j].mask;
516
517                 curr=head;
518                 curr2=head;
519                 tail2=tail;
520                 for (;;)
521                         {
522                         if ((curr == NULL) || (curr == tail2)) break;
523                         curr=curr2;
524                         curr2=curr->next;
525
526                         cp=curr->cipher;
527                         ma=mask & cp->algorithms;
528                         if ((ma == 0) || ((ma & algorithms) != ma))
529                                 {
530                                 /* does not apply */
531                                 continue;
532                                 }
533
534                         /* add the cipher if it has not been added yet. */
535                         if (type == CIPHER_ADD)
536                                 {
537                                 if (!curr->active)
538                                         {
539                                         ll_append_tail(&head,curr,&tail);
540                                         curr->active=1;
541                                         }
542                                 }
543                         /* Move the added cipher to this location */
544                         else if (type == CIPHER_ORD)
545                                 {
546                                 if (curr->active)
547                                         {
548                                         ll_append_tail(&head,curr,&tail);
549                                         }
550                                 }
551                         else if (type == CIPHER_DEL)
552                                 curr->active=0;
553                         if (type == CIPHER_KILL)
554                                 {
555                                 if (head == curr)
556                                         head=curr->next;
557                                 else
558                                         curr->prev->next=curr->next;
559                                 if (tail == curr)
560                                         tail=curr->prev;
561                                 curr->active=0;
562                                 if (curr->next != NULL)
563                                         curr->next->prev=curr->prev;
564                                 if (curr->prev != NULL)
565                                         curr->prev->next=curr->next;
566                                 curr->next=NULL;
567                                 curr->prev=NULL;
568                                 }
569                         }
570                 }
571
572         for (curr=head; curr != NULL; curr=curr->next)
573                 {
574                 if (curr->active)
575                         {
576                         sk_SSL_CIPHER_push(ret,curr->cipher);
577 #ifdef CIPHER_DEBUG
578                         printf("<%s>\n",curr->cipher->name);
579 #endif
580                         }
581                 }
582
583         if (cipher_list != NULL)
584                 {
585                 if (*cipher_list != NULL)
586                         sk_SSL_CIPHER_free(*cipher_list);
587                 *cipher_list=ret;
588                 }
589
590         if (cipher_list_by_id != NULL)
591                 {
592                 if (*cipher_list_by_id != NULL)
593                         sk_SSL_CIPHER_free(*cipher_list_by_id);
594                 *cipher_list_by_id=sk_SSL_CIPHER_dup(ret);
595                 }
596
597         if (    (cipher_list_by_id == NULL) ||
598                 (*cipher_list_by_id == NULL) ||
599                 (cipher_list == NULL) ||
600                 (*cipher_list == NULL))
601                 goto err;
602         sk_SSL_CIPHER_set_cmp_func(*cipher_list_by_id,ssl_cipher_ptr_id_cmp);
603
604         ok=ret;
605         ret=NULL;
606 err:
607         if (tmp_str) Free(tmp_str);
608         if (ops != NULL) Free(ops);
609         if (ret != NULL) sk_SSL_CIPHER_free(ret);
610         if (ca_list != NULL) sk_free(ca_list);
611         if (list != NULL) Free(list);
612         return(ok);
613         }
614
615 char *SSL_CIPHER_description(SSL_CIPHER *cipher, char *buf, int len)
616         {
617         int is_export,pkl,kl;
618         char *ver,*exp;
619         char *kx,*au,*enc,*mac;
620         unsigned long alg,alg2;
621         static char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s\n";
622         
623         alg=cipher->algorithms;
624         alg2=cipher->algorithm2;
625
626         is_export=SSL_IS_EXPORT(alg);
627         pkl=SSL_EXPORT_PKEYLENGTH(alg);
628         kl=SSL_EXPORT_KEYLENGTH(alg);
629         exp=is_export?" export":"";
630
631         if (alg & SSL_SSLV2)
632                 ver="SSLv2";
633         else if (alg & SSL_SSLV3)
634                 ver="SSLv3";
635         else
636                 ver="unknown";
637
638         switch (alg&SSL_MKEY_MASK)
639                 {
640         case SSL_kRSA:
641                 kx=is_export?(pkl == 512 ? "RSA(512)" : "RSA(1024)"):"RSA";
642                 break;
643         case SSL_kDHr:
644                 kx="DH/RSA";
645                 break;
646         case SSL_kDHd:
647                 kx="DH/DSS";
648                 break;
649         case SSL_kFZA:
650                 kx="Fortezza";
651                 break;
652         case SSL_kEDH:
653                 kx=is_export?(pkl == 512 ? "DH(512)" : "DH(1024)"):"DH";
654                 break;
655         default:
656                 kx="unknown";
657                 }
658
659         switch (alg&SSL_AUTH_MASK)
660                 {
661         case SSL_aRSA:
662                 au="RSA";
663                 break;
664         case SSL_aDSS:
665                 au="DSS";
666                 break;
667         case SSL_aDH:
668                 au="DH";
669                 break;
670         case SSL_aFZA:
671         case SSL_aNULL:
672                 au="None";
673                 break;
674         default:
675                 au="unknown";
676                 break;
677                 }
678
679         switch (alg&SSL_ENC_MASK)
680                 {
681         case SSL_DES:
682                 enc=(is_export && kl == 5)?"DES(40)":"DES(56)";
683                 break;
684         case SSL_3DES:
685                 enc="3DES(168)";
686                 break;
687         case SSL_RC4:
688                 enc=is_export?(kl == 5 ? "RC4(40)" : "RC4(56)")
689                   :((alg2&SSL2_CF_8_BYTE_ENC)?"RC4(64)":"RC4(128)");
690                 break;
691         case SSL_RC2:
692                 enc=is_export?(kl == 5 ? "RC2(40)" : "RC2(56)"):"RC2(128)";
693                 break;
694         case SSL_IDEA:
695                 enc="IDEA(128)";
696                 break;
697         case SSL_eFZA:
698                 enc="Fortezza";
699                 break;
700         case SSL_eNULL:
701                 enc="None";
702                 break;
703         default:
704                 enc="unknown";
705                 break;
706                 }
707
708         switch (alg&SSL_MAC_MASK)
709                 {
710         case SSL_MD5:
711                 mac="MD5";
712                 break;
713         case SSL_SHA1:
714                 mac="SHA1";
715                 break;
716         default:
717                 mac="unknown";
718                 break;
719                 }
720
721         if (buf == NULL)
722                 {
723                 buf=Malloc(128);
724                 if (buf == NULL) return("Malloc Error");
725                 }
726         else if (len < 128)
727                 return("Buffer too small");
728
729         sprintf(buf,format,cipher->name,ver,kx,au,enc,mac,exp);
730         return(buf);
731         }
732
733 char *SSL_CIPHER_get_version(SSL_CIPHER *c)
734         {
735         int i;
736
737         if (c == NULL) return("(NONE)");
738         i=(int)(c->id>>24L);
739         if (i == 3)
740                 return("TLSv1/SSLv3");
741         else if (i == 2)
742                 return("SSLv2");
743         else
744                 return("unknown");
745         }
746
747 /* return the actual cipher being used */
748 const char *SSL_CIPHER_get_name(SSL_CIPHER *c)
749         {
750         if (c != NULL)
751                 return(c->name);
752         return("(NONE)");
753         }
754
755 /* number of bits for symetric cipher */
756 int SSL_CIPHER_get_bits(SSL_CIPHER *c, int *alg_bits)
757         {
758         int ret=0,a=0;
759         const EVP_CIPHER *enc;
760         const EVP_MD *md;
761         SSL_SESSION ss;
762
763         if (c != NULL)
764                 {
765                 ss.cipher=c;
766                 if (!ssl_cipher_get_evp(&ss,&enc,&md,NULL))
767                         return(0);
768
769                 a=EVP_CIPHER_key_length(enc)*8;
770
771                 if (SSL_C_IS_EXPORT(c))
772                         {
773                         ret=SSL_C_EXPORT_KEYLENGTH(c)*8;
774                         }
775                 else
776                         {
777                         if (c->algorithm2 & SSL2_CF_8_BYTE_ENC)
778                                 ret=64;
779                         else
780                                 ret=a;
781                         }
782                 }
783
784         if (alg_bits != NULL) *alg_bits=a;
785         
786         return(ret);
787         }
788
789 SSL_COMP *ssl3_comp_find(STACK_OF(SSL_COMP) *sk, int n)
790         {
791         SSL_COMP *ctmp;
792         int i,nn;
793
794         if ((n == 0) || (sk == NULL)) return(NULL);
795         nn=sk_SSL_COMP_num(sk);
796         for (i=0; i<nn; i++)
797                 {
798                 ctmp=sk_SSL_COMP_value(sk,i);
799                 if (ctmp->id == n)
800                         return(ctmp);
801                 }
802         return(NULL);
803         }
804
805 static int sk_comp_cmp(SSL_COMP **a,SSL_COMP **b)
806         {
807         return((*a)->id-(*b)->id);
808         }
809
810 STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void)
811         {
812         return(ssl_comp_methods);
813         }
814
815 int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm)
816         {
817         SSL_COMP *comp;
818         STACK_OF(SSL_COMP) *sk;
819
820         comp=(SSL_COMP *)Malloc(sizeof(SSL_COMP));
821         comp->id=id;
822         comp->method=cm;
823         if (ssl_comp_methods == NULL)
824                 sk=ssl_comp_methods=sk_SSL_COMP_new(sk_comp_cmp);
825         else
826                 sk=ssl_comp_methods;
827         if ((sk == NULL) || !sk_SSL_COMP_push(sk,comp))
828                 {
829                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,ERR_R_MALLOC_FAILURE);
830                 return(0);
831                 }
832         else
833                 return(1);
834         }
835