The first argument to load_iv should really be a char ** instead of an
[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  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
60  * ECC cipher suite support in OpenSSL originally developed by 
61  * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
62  */
63 #include <stdio.h>
64 #include <openssl/objects.h>
65 #include <openssl/comp.h>
66 #include "ssl_locl.h"
67
68 #define SSL_ENC_DES_IDX         0
69 #define SSL_ENC_3DES_IDX        1
70 #define SSL_ENC_RC4_IDX         2
71 #define SSL_ENC_RC2_IDX         3
72 #define SSL_ENC_IDEA_IDX        4
73 #define SSL_ENC_eFZA_IDX        5
74 #define SSL_ENC_NULL_IDX        6
75 #define SSL_ENC_AES128_IDX      7
76 #define SSL_ENC_AES256_IDX      8
77 #define SSL_ENC_NUM_IDX         9
78
79 static const EVP_CIPHER *ssl_cipher_methods[SSL_ENC_NUM_IDX]={
80         NULL,NULL,NULL,NULL,NULL,NULL,
81         };
82
83 #define SSL_COMP_NULL_IDX       0
84 #define SSL_COMP_ZLIB_IDX       1
85 #define SSL_COMP_NUM_IDX        2
86
87 static STACK_OF(SSL_COMP) *ssl_comp_methods=NULL;
88
89 #define SSL_MD_MD5_IDX  0
90 #define SSL_MD_SHA1_IDX 1
91 #define SSL_MD_NUM_IDX  2
92 static const EVP_MD *ssl_digest_methods[SSL_MD_NUM_IDX]={
93         NULL,NULL,
94         };
95
96 #define CIPHER_ADD      1
97 #define CIPHER_KILL     2
98 #define CIPHER_DEL      3
99 #define CIPHER_ORD      4
100 #define CIPHER_SPECIAL  5
101
102 typedef struct cipher_order_st
103         {
104         SSL_CIPHER *cipher;
105         int active;
106         int dead;
107         struct cipher_order_st *next,*prev;
108         } CIPHER_ORDER;
109
110 static const SSL_CIPHER cipher_aliases[]={
111         /* Don't include eNULL unless specifically enabled. */
112         /* Don't include ECC in ALL because these ciphers are not yet official. */
113         {0,SSL_TXT_ALL, 0,SSL_ALL & ~SSL_eNULL & ~SSL_kECDH & ~SSL_kECDHE, SSL_ALL ,0,0,0,SSL_ALL,SSL_ALL}, /* must be first */
114         /* TODO: COMPLEMENT OF ALL and COMPLEMENT OF DEFAULT do not have ECC cipher suites handled properly. */
115         {0,SSL_TXT_CMPALL,0,SSL_eNULL,0,0,0,0,SSL_ENC_MASK,0},  /* COMPLEMENT OF ALL */
116         {0,SSL_TXT_CMPDEF,0,SSL_ADH, 0,0,0,0,SSL_AUTH_MASK,0},
117         {0,SSL_TXT_kKRB5,0,SSL_kKRB5,0,0,0,0,SSL_MKEY_MASK,0},  /* VRS Kerberos5 */
118         {0,SSL_TXT_kRSA,0,SSL_kRSA,  0,0,0,0,SSL_MKEY_MASK,0},
119         {0,SSL_TXT_kDHr,0,SSL_kDHr,  0,0,0,0,SSL_MKEY_MASK,0},
120         {0,SSL_TXT_kDHd,0,SSL_kDHd,  0,0,0,0,SSL_MKEY_MASK,0},
121         {0,SSL_TXT_kEDH,0,SSL_kEDH,  0,0,0,0,SSL_MKEY_MASK,0},
122         {0,SSL_TXT_kFZA,0,SSL_kFZA,  0,0,0,0,SSL_MKEY_MASK,0},
123         {0,SSL_TXT_DH,  0,SSL_DH,    0,0,0,0,SSL_MKEY_MASK,0},
124         {0,SSL_TXT_ECC, 0,(SSL_kECDH|SSL_kECDHE), 0,0,0,0,SSL_MKEY_MASK,0},
125         {0,SSL_TXT_EDH, 0,SSL_EDH,   0,0,0,0,SSL_MKEY_MASK|SSL_AUTH_MASK,0},
126         {0,SSL_TXT_aKRB5,0,SSL_aKRB5,0,0,0,0,SSL_AUTH_MASK,0},  /* VRS Kerberos5 */
127         {0,SSL_TXT_aRSA,0,SSL_aRSA,  0,0,0,0,SSL_AUTH_MASK,0},
128         {0,SSL_TXT_aDSS,0,SSL_aDSS,  0,0,0,0,SSL_AUTH_MASK,0},
129         {0,SSL_TXT_aFZA,0,SSL_aFZA,  0,0,0,0,SSL_AUTH_MASK,0},
130         {0,SSL_TXT_aNULL,0,SSL_aNULL,0,0,0,0,SSL_AUTH_MASK,0},
131         {0,SSL_TXT_aDH, 0,SSL_aDH,   0,0,0,0,SSL_AUTH_MASK,0},
132         {0,SSL_TXT_DSS, 0,SSL_DSS,   0,0,0,0,SSL_AUTH_MASK,0},
133
134         {0,SSL_TXT_DES, 0,SSL_DES,   0,0,0,0,SSL_ENC_MASK,0},
135         {0,SSL_TXT_3DES,0,SSL_3DES,  0,0,0,0,SSL_ENC_MASK,0},
136         {0,SSL_TXT_RC4, 0,SSL_RC4,   0,0,0,0,SSL_ENC_MASK,0},
137         {0,SSL_TXT_RC2, 0,SSL_RC2,   0,0,0,0,SSL_ENC_MASK,0},
138 #ifndef OPENSSL_NO_IDEA
139         {0,SSL_TXT_IDEA,0,SSL_IDEA,  0,0,0,0,SSL_ENC_MASK,0},
140 #endif
141         {0,SSL_TXT_eNULL,0,SSL_eNULL,0,0,0,0,SSL_ENC_MASK,0},
142         {0,SSL_TXT_eFZA,0,SSL_eFZA,  0,0,0,0,SSL_ENC_MASK,0},
143         {0,SSL_TXT_AES, 0,SSL_AES,   0,0,0,0,SSL_ENC_MASK,0},
144
145         {0,SSL_TXT_MD5, 0,SSL_MD5,   0,0,0,0,SSL_MAC_MASK,0},
146         {0,SSL_TXT_SHA1,0,SSL_SHA1,  0,0,0,0,SSL_MAC_MASK,0},
147         {0,SSL_TXT_SHA, 0,SSL_SHA,   0,0,0,0,SSL_MAC_MASK,0},
148
149         {0,SSL_TXT_NULL,0,SSL_NULL,  0,0,0,0,SSL_ENC_MASK,0},
150         {0,SSL_TXT_KRB5,0,SSL_KRB5,  0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK,0},
151         {0,SSL_TXT_RSA, 0,SSL_RSA,   0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK,0},
152         {0,SSL_TXT_ADH, 0,SSL_ADH,   0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK,0},
153         {0,SSL_TXT_FZA, 0,SSL_FZA,   0,0,0,0,SSL_AUTH_MASK|SSL_MKEY_MASK|SSL_ENC_MASK,0},
154
155         {0,SSL_TXT_SSLV2, 0,SSL_SSLV2, 0,0,0,0,SSL_SSL_MASK,0},
156         {0,SSL_TXT_SSLV3, 0,SSL_SSLV3, 0,0,0,0,SSL_SSL_MASK,0},
157         {0,SSL_TXT_TLSV1, 0,SSL_TLSV1, 0,0,0,0,SSL_SSL_MASK,0},
158
159         {0,SSL_TXT_EXP   ,0, 0,SSL_EXPORT, 0,0,0,0,SSL_EXP_MASK},
160         {0,SSL_TXT_EXPORT,0, 0,SSL_EXPORT, 0,0,0,0,SSL_EXP_MASK},
161         {0,SSL_TXT_EXP40, 0, 0, SSL_EXP40, 0,0,0,0,SSL_STRONG_MASK},
162         {0,SSL_TXT_EXP56, 0, 0, SSL_EXP56, 0,0,0,0,SSL_STRONG_MASK},
163         {0,SSL_TXT_LOW,   0, 0,   SSL_LOW, 0,0,0,0,SSL_STRONG_MASK},
164         {0,SSL_TXT_MEDIUM,0, 0,SSL_MEDIUM, 0,0,0,0,SSL_STRONG_MASK},
165         {0,SSL_TXT_HIGH,  0, 0,  SSL_HIGH, 0,0,0,0,SSL_STRONG_MASK},
166         };
167
168 static int init_ciphers=1;
169
170 static void load_ciphers(void)
171         {
172         ssl_cipher_methods[SSL_ENC_DES_IDX]= 
173                 EVP_get_cipherbyname(SN_des_cbc);
174         ssl_cipher_methods[SSL_ENC_3DES_IDX]=
175                 EVP_get_cipherbyname(SN_des_ede3_cbc);
176         ssl_cipher_methods[SSL_ENC_RC4_IDX]=
177                 EVP_get_cipherbyname(SN_rc4);
178         ssl_cipher_methods[SSL_ENC_RC2_IDX]= 
179                 EVP_get_cipherbyname(SN_rc2_cbc);
180 #ifndef OPENSSL_NO_IDEA
181         ssl_cipher_methods[SSL_ENC_IDEA_IDX]= 
182                 EVP_get_cipherbyname(SN_idea_cbc);
183 #else
184         ssl_cipher_methods[SSL_ENC_IDEA_IDX]= NULL;
185 #endif
186         ssl_cipher_methods[SSL_ENC_AES128_IDX]=
187           EVP_get_cipherbyname(SN_aes_128_cbc);
188         ssl_cipher_methods[SSL_ENC_AES256_IDX]=
189           EVP_get_cipherbyname(SN_aes_256_cbc);
190
191         ssl_digest_methods[SSL_MD_MD5_IDX]=
192                 EVP_get_digestbyname(SN_md5);
193         ssl_digest_methods[SSL_MD_SHA1_IDX]=
194                 EVP_get_digestbyname(SN_sha1);
195         init_ciphers=0;
196         }
197
198 static int sk_comp_cmp(const SSL_COMP * const *a,
199                         const SSL_COMP * const *b)
200         {
201         return((*a)->id-(*b)->id);
202         }
203
204 static void load_builtin_compressions(void)
205         {
206         if (ssl_comp_methods != NULL)
207                 return;
208
209         CRYPTO_w_lock(CRYPTO_LOCK_SSL);
210         if (ssl_comp_methods == NULL)
211                 {
212                 SSL_COMP *comp = NULL;
213
214                 MemCheck_off();
215                 ssl_comp_methods=sk_SSL_COMP_new(sk_comp_cmp);
216                 if (ssl_comp_methods != NULL)
217                         {
218                         comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
219                         if (comp != NULL)
220                                 {
221                                 comp->method=COMP_zlib();
222                                 if (comp->method
223                                         && comp->method->type == NID_undef)
224                                         OPENSSL_free(comp);
225                                 else
226                                         {
227                                         comp->id=SSL_COMP_ZLIB_IDX;
228                                         comp->name=comp->method->name;
229                                         sk_SSL_COMP_push(ssl_comp_methods,comp);
230                                         }
231                                 }
232                         }
233                 MemCheck_on();
234                 }
235         CRYPTO_w_unlock(CRYPTO_LOCK_SSL);
236         }
237
238 int ssl_cipher_get_evp(SSL_SESSION *s, const EVP_CIPHER **enc,
239              const EVP_MD **md, SSL_COMP **comp)
240         {
241         int i;
242         SSL_CIPHER *c;
243
244         c=s->cipher;
245         if (c == NULL) return(0);
246         if (comp != NULL)
247                 {
248                 SSL_COMP ctmp;
249
250                 load_builtin_compressions();
251
252                 *comp=NULL;
253                 ctmp.id=s->compress_meth;
254                 if (ssl_comp_methods != NULL)
255                         {
256                         i=sk_SSL_COMP_find(ssl_comp_methods,&ctmp);
257                         if (i >= 0)
258                                 *comp=sk_SSL_COMP_value(ssl_comp_methods,i);
259                         else
260                                 *comp=NULL;
261                         }
262                 }
263
264         if ((enc == NULL) || (md == NULL)) return(0);
265
266         switch (c->algorithms & SSL_ENC_MASK)
267                 {
268         case SSL_DES:
269                 i=SSL_ENC_DES_IDX;
270                 break;
271         case SSL_3DES:
272                 i=SSL_ENC_3DES_IDX;
273                 break;
274         case SSL_RC4:
275                 i=SSL_ENC_RC4_IDX;
276                 break;
277         case SSL_RC2:
278                 i=SSL_ENC_RC2_IDX;
279                 break;
280         case SSL_IDEA:
281                 i=SSL_ENC_IDEA_IDX;
282                 break;
283         case SSL_eNULL:
284                 i=SSL_ENC_NULL_IDX;
285                 break;
286         case SSL_AES:
287                 switch(c->alg_bits)
288                         {
289                 case 128: i=SSL_ENC_AES128_IDX; break;
290                 case 256: i=SSL_ENC_AES256_IDX; break;
291                 default: i=-1; break;
292                         }
293                 break;
294         default:
295                 i= -1;
296                 break;
297                 }
298
299         if ((i < 0) || (i > SSL_ENC_NUM_IDX))
300                 *enc=NULL;
301         else
302                 {
303                 if (i == SSL_ENC_NULL_IDX)
304                         *enc=EVP_enc_null();
305                 else
306                         *enc=ssl_cipher_methods[i];
307                 }
308
309         switch (c->algorithms & SSL_MAC_MASK)
310                 {
311         case SSL_MD5:
312                 i=SSL_MD_MD5_IDX;
313                 break;
314         case SSL_SHA1:
315                 i=SSL_MD_SHA1_IDX;
316                 break;
317         default:
318                 i= -1;
319                 break;
320                 }
321         if ((i < 0) || (i > SSL_MD_NUM_IDX))
322                 *md=NULL;
323         else
324                 *md=ssl_digest_methods[i];
325
326         if ((*enc != NULL) && (*md != NULL))
327                 return(1);
328         else
329                 return(0);
330         }
331
332 #define ITEM_SEP(a) \
333         (((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ','))
334
335 static void ll_append_tail(CIPHER_ORDER **head, CIPHER_ORDER *curr,
336              CIPHER_ORDER **tail)
337         {
338         if (curr == *tail) return;
339         if (curr == *head)
340                 *head=curr->next;
341         if (curr->prev != NULL)
342                 curr->prev->next=curr->next;
343         if (curr->next != NULL) /* should always be true */
344                 curr->next->prev=curr->prev;
345         (*tail)->next=curr;
346         curr->prev= *tail;
347         curr->next=NULL;
348         *tail=curr;
349         }
350
351 static unsigned long ssl_cipher_get_disabled(void)
352         {
353         unsigned long mask;
354
355         mask = SSL_kFZA;
356 #ifdef OPENSSL_NO_RSA
357         mask |= SSL_aRSA|SSL_kRSA;
358 #endif
359 #ifdef OPENSSL_NO_DSA
360         mask |= SSL_aDSS;
361 #endif
362 #ifdef OPENSSL_NO_DH
363         mask |= SSL_kDHr|SSL_kDHd|SSL_kEDH|SSL_aDH;
364 #endif
365 #ifdef OPENSSL_NO_KRB5
366         mask |= SSL_kKRB5|SSL_aKRB5;
367 #endif
368 #ifdef OPENSSL_NO_ECDH
369         mask |= SSL_kECDH|SSL_kECDHE;
370 #endif
371 #ifdef SSL_FORBID_ENULL
372         mask |= SSL_eNULL;
373 #endif
374
375         mask |= (ssl_cipher_methods[SSL_ENC_DES_IDX ] == NULL) ? SSL_DES :0;
376         mask |= (ssl_cipher_methods[SSL_ENC_3DES_IDX] == NULL) ? SSL_3DES:0;
377         mask |= (ssl_cipher_methods[SSL_ENC_RC4_IDX ] == NULL) ? SSL_RC4 :0;
378         mask |= (ssl_cipher_methods[SSL_ENC_RC2_IDX ] == NULL) ? SSL_RC2 :0;
379         mask |= (ssl_cipher_methods[SSL_ENC_IDEA_IDX] == NULL) ? SSL_IDEA:0;
380         mask |= (ssl_cipher_methods[SSL_ENC_eFZA_IDX] == NULL) ? SSL_eFZA:0;
381         mask |= (ssl_cipher_methods[SSL_ENC_AES128_IDX] == NULL) ? SSL_AES:0;
382
383         mask |= (ssl_digest_methods[SSL_MD_MD5_IDX ] == NULL) ? SSL_MD5 :0;
384         mask |= (ssl_digest_methods[SSL_MD_SHA1_IDX] == NULL) ? SSL_SHA1:0;
385
386         return(mask);
387         }
388
389 static void ssl_cipher_collect_ciphers(const SSL_METHOD *ssl_method,
390                 int num_of_ciphers, unsigned long mask, CIPHER_ORDER *co_list,
391                 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
392         {
393         int i, co_list_num;
394         SSL_CIPHER *c;
395
396         /*
397          * We have num_of_ciphers descriptions compiled in, depending on the
398          * method selected (SSLv2 and/or SSLv3, TLSv1 etc).
399          * These will later be sorted in a linked list with at most num
400          * entries.
401          */
402
403         /* Get the initial list of ciphers */
404         co_list_num = 0;        /* actual count of ciphers */
405         for (i = 0; i < num_of_ciphers; i++)
406                 {
407                 c = ssl_method->get_cipher(i);
408                 /* drop those that use any of that is not available */
409                 if ((c != NULL) && c->valid && !(c->algorithms & mask))
410                         {
411                         co_list[co_list_num].cipher = c;
412                         co_list[co_list_num].next = NULL;
413                         co_list[co_list_num].prev = NULL;
414                         co_list[co_list_num].active = 0;
415                         co_list_num++;
416 #ifdef KSSL_DEBUG
417                         printf("\t%d: %s %lx %lx\n",i,c->name,c->id,c->algorithms);
418 #endif  /* KSSL_DEBUG */
419                         /*
420                         if (!sk_push(ca_list,(char *)c)) goto err;
421                         */
422                         }
423                 }
424
425         /*
426          * Prepare linked list from list entries
427          */     
428         for (i = 1; i < co_list_num - 1; i++)
429                 {
430                 co_list[i].prev = &(co_list[i-1]);
431                 co_list[i].next = &(co_list[i+1]);
432                 }
433         if (co_list_num > 0)
434                 {
435                 (*head_p) = &(co_list[0]);
436                 (*head_p)->prev = NULL;
437                 (*head_p)->next = &(co_list[1]);
438                 (*tail_p) = &(co_list[co_list_num - 1]);
439                 (*tail_p)->prev = &(co_list[co_list_num - 2]);
440                 (*tail_p)->next = NULL;
441                 }
442         }
443
444 static void ssl_cipher_collect_aliases(SSL_CIPHER **ca_list,
445                         int num_of_group_aliases, unsigned long mask,
446                         CIPHER_ORDER *head)
447         {
448         CIPHER_ORDER *ciph_curr;
449         SSL_CIPHER **ca_curr;
450         int i;
451
452         /*
453          * First, add the real ciphers as already collected
454          */
455         ciph_curr = head;
456         ca_curr = ca_list;
457         while (ciph_curr != NULL)
458                 {
459                 *ca_curr = ciph_curr->cipher;
460                 ca_curr++;
461                 ciph_curr = ciph_curr->next;
462                 }
463
464         /*
465          * Now we add the available ones from the cipher_aliases[] table.
466          * They represent either an algorithm, that must be fully
467          * supported (not match any bit in mask) or represent a cipher
468          * strength value (will be added in any case because algorithms=0).
469          */
470         for (i = 0; i < num_of_group_aliases; i++)
471                 {
472                 if ((i == 0) ||         /* always fetch "ALL" */
473                     !(cipher_aliases[i].algorithms & mask))
474                         {
475                         *ca_curr = (SSL_CIPHER *)(cipher_aliases + i);
476                         ca_curr++;
477                         }
478                 }
479
480         *ca_curr = NULL;        /* end of list */
481         }
482
483 static void ssl_cipher_apply_rule(unsigned long algorithms, unsigned long mask,
484                 unsigned long algo_strength, unsigned long mask_strength,
485                 int rule, int strength_bits, CIPHER_ORDER *co_list,
486                 CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
487         {
488         CIPHER_ORDER *head, *tail, *curr, *curr2, *tail2;
489         SSL_CIPHER *cp;
490         unsigned long ma, ma_s;
491
492 #ifdef CIPHER_DEBUG
493         printf("Applying rule %d with %08lx %08lx %08lx %08lx (%d)\n",
494                 rule, algorithms, mask, algo_strength, mask_strength,
495                 strength_bits);
496 #endif
497
498         curr = head = *head_p;
499         curr2 = head;
500         tail2 = tail = *tail_p;
501         for (;;)
502                 {
503                 if ((curr == NULL) || (curr == tail2)) break;
504                 curr = curr2;
505                 curr2 = curr->next;
506
507                 cp = curr->cipher;
508
509                 /*
510                  * Selection criteria is either the number of strength_bits
511                  * or the algorithm used.
512                  */
513                 if (strength_bits == -1)
514                         {
515                         ma = mask & cp->algorithms;
516                         ma_s = mask_strength & cp->algo_strength;
517
518 #ifdef CIPHER_DEBUG
519                         printf("\nName: %s:\nAlgo = %08lx Algo_strength = %08lx\nMask = %08lx Mask_strength %08lx\n", cp->name, cp->algorithms, cp->algo_strength, mask, mask_strength);
520                         printf("ma = %08lx ma_s %08lx, ma&algo=%08lx, ma_s&algos=%08lx\n", ma, ma_s, ma&algorithms, ma_s&algo_strength);
521 #endif
522                         /*
523                          * Select: if none of the mask bit was met from the
524                          * cipher or not all of the bits were met, the
525                          * selection does not apply.
526                          */
527                         if (((ma == 0) && (ma_s == 0)) ||
528                             ((ma & algorithms) != ma) ||
529                             ((ma_s & algo_strength) != ma_s))
530                                 continue; /* does not apply */
531                         }
532                 else if (strength_bits != cp->strength_bits)
533                         continue;       /* does not apply */
534
535 #ifdef CIPHER_DEBUG
536                 printf("Action = %d\n", rule);
537 #endif
538
539                 /* add the cipher if it has not been added yet. */
540                 if (rule == CIPHER_ADD)
541                         {
542                         if (!curr->active)
543                                 {
544                                 ll_append_tail(&head, curr, &tail);
545                                 curr->active = 1;
546                                 }
547                         }
548                 /* Move the added cipher to this location */
549                 else if (rule == CIPHER_ORD)
550                         {
551                         if (curr->active)
552                                 {
553                                 ll_append_tail(&head, curr, &tail);
554                                 }
555                         }
556                 else if (rule == CIPHER_DEL)
557                         curr->active = 0;
558                 else if (rule == CIPHER_KILL)
559                         {
560                         if (head == curr)
561                                 head = curr->next;
562                         else
563                                 curr->prev->next = curr->next;
564                         if (tail == curr)
565                                 tail = curr->prev;
566                         curr->active = 0;
567                         if (curr->next != NULL)
568                                 curr->next->prev = curr->prev;
569                         if (curr->prev != NULL)
570                                 curr->prev->next = curr->next;
571                         curr->next = NULL;
572                         curr->prev = NULL;
573                         }
574                 }
575
576         *head_p = head;
577         *tail_p = tail;
578         }
579
580 static int ssl_cipher_strength_sort(CIPHER_ORDER *co_list,
581                                     CIPHER_ORDER **head_p,
582                                     CIPHER_ORDER **tail_p)
583         {
584         int max_strength_bits, i, *number_uses;
585         CIPHER_ORDER *curr;
586
587         /*
588          * This routine sorts the ciphers with descending strength. The sorting
589          * must keep the pre-sorted sequence, so we apply the normal sorting
590          * routine as '+' movement to the end of the list.
591          */
592         max_strength_bits = 0;
593         curr = *head_p;
594         while (curr != NULL)
595                 {
596                 if (curr->active &&
597                     (curr->cipher->strength_bits > max_strength_bits))
598                     max_strength_bits = curr->cipher->strength_bits;
599                 curr = curr->next;
600                 }
601
602         number_uses = OPENSSL_malloc((max_strength_bits + 1) * sizeof(int));
603         if (!number_uses)
604         {
605                 SSLerr(SSL_F_SSL_CIPHER_STRENGTH_SORT,ERR_R_MALLOC_FAILURE);
606                 return(0);
607         }
608         memset(number_uses, 0, (max_strength_bits + 1) * sizeof(int));
609
610         /*
611          * Now find the strength_bits values actually used
612          */
613         curr = *head_p;
614         while (curr != NULL)
615                 {
616                 if (curr->active)
617                         number_uses[curr->cipher->strength_bits]++;
618                 curr = curr->next;
619                 }
620         /*
621          * Go through the list of used strength_bits values in descending
622          * order.
623          */
624         for (i = max_strength_bits; i >= 0; i--)
625                 if (number_uses[i] > 0)
626                         ssl_cipher_apply_rule(0, 0, 0, 0, CIPHER_ORD, i,
627                                         co_list, head_p, tail_p);
628
629         OPENSSL_free(number_uses);
630         return(1);
631         }
632
633 static int ssl_cipher_process_rulestr(const char *rule_str,
634                 CIPHER_ORDER *co_list, CIPHER_ORDER **head_p,
635                 CIPHER_ORDER **tail_p, SSL_CIPHER **ca_list)
636         {
637         unsigned long algorithms, mask, algo_strength, mask_strength;
638         const char *l, *start, *buf;
639         int j, multi, found, rule, retval, ok, buflen;
640         char ch;
641
642         retval = 1;
643         l = rule_str;
644         for (;;)
645                 {
646                 ch = *l;
647
648                 if (ch == '\0')
649                         break;          /* done */
650                 if (ch == '-')
651                         { rule = CIPHER_DEL; l++; }
652                 else if (ch == '+')
653                         { rule = CIPHER_ORD; l++; }
654                 else if (ch == '!')
655                         { rule = CIPHER_KILL; l++; }
656                 else if (ch == '@')
657                         { rule = CIPHER_SPECIAL; l++; }
658                 else
659                         { rule = CIPHER_ADD; }
660
661                 if (ITEM_SEP(ch))
662                         {
663                         l++;
664                         continue;
665                         }
666
667                 algorithms = mask = algo_strength = mask_strength = 0;
668
669                 start=l;
670                 for (;;)
671                         {
672                         ch = *l;
673                         buf = l;
674                         buflen = 0;
675 #ifndef CHARSET_EBCDIC
676                         while ( ((ch >= 'A') && (ch <= 'Z')) ||
677                                 ((ch >= '0') && (ch <= '9')) ||
678                                 ((ch >= 'a') && (ch <= 'z')) ||
679                                  (ch == '-'))
680 #else
681                         while ( isalnum(ch) || (ch == '-'))
682 #endif
683                                  {
684                                  ch = *(++l);
685                                  buflen++;
686                                  }
687
688                         if (buflen == 0)
689                                 {
690                                 /*
691                                  * We hit something we cannot deal with,
692                                  * it is no command or separator nor
693                                  * alphanumeric, so we call this an error.
694                                  */
695                                 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
696                                        SSL_R_INVALID_COMMAND);
697                                 retval = found = 0;
698                                 l++;
699                                 break;
700                                 }
701
702                         if (rule == CIPHER_SPECIAL)
703                                 {
704                                 found = 0; /* unused -- avoid compiler warning */
705                                 break;  /* special treatment */
706                                 }
707
708                         /* check for multi-part specification */
709                         if (ch == '+')
710                                 {
711                                 multi=1;
712                                 l++;
713                                 }
714                         else
715                                 multi=0;
716
717                         /*
718                          * Now search for the cipher alias in the ca_list. Be careful
719                          * with the strncmp, because the "buflen" limitation
720                          * will make the rule "ADH:SOME" and the cipher
721                          * "ADH-MY-CIPHER" look like a match for buflen=3.
722                          * So additionally check whether the cipher name found
723                          * has the correct length. We can save a strlen() call:
724                          * just checking for the '\0' at the right place is
725                          * sufficient, we have to strncmp() anyway. (We cannot
726                          * use strcmp(), because buf is not '\0' terminated.)
727                          */
728                          j = found = 0;
729                          while (ca_list[j])
730                                 {
731                                 if (!strncmp(buf, ca_list[j]->name, buflen) &&
732                                     (ca_list[j]->name[buflen] == '\0'))
733                                         {
734                                         found = 1;
735                                         break;
736                                         }
737                                 else
738                                         j++;
739                                 }
740                         if (!found)
741                                 break;  /* ignore this entry */
742
743                         algorithms |= ca_list[j]->algorithms;
744                         mask |= ca_list[j]->mask;
745                         algo_strength |= ca_list[j]->algo_strength;
746                         mask_strength |= ca_list[j]->mask_strength;
747
748                         if (!multi) break;
749                         }
750
751                 /*
752                  * Ok, we have the rule, now apply it
753                  */
754                 if (rule == CIPHER_SPECIAL)
755                         {       /* special command */
756                         ok = 0;
757                         if ((buflen == 8) &&
758                                 !strncmp(buf, "STRENGTH", 8))
759                                 ok = ssl_cipher_strength_sort(co_list,
760                                         head_p, tail_p);
761                         else
762                                 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
763                                         SSL_R_INVALID_COMMAND);
764                         if (ok == 0)
765                                 retval = 0;
766                         /*
767                          * We do not support any "multi" options
768                          * together with "@", so throw away the
769                          * rest of the command, if any left, until
770                          * end or ':' is found.
771                          */
772                         while ((*l != '\0') && ITEM_SEP(*l))
773                                 l++;
774                         }
775                 else if (found)
776                         {
777                         ssl_cipher_apply_rule(algorithms, mask,
778                                 algo_strength, mask_strength, rule, -1,
779                                 co_list, head_p, tail_p);
780                         }
781                 else
782                         {
783                         while ((*l != '\0') && ITEM_SEP(*l))
784                                 l++;
785                         }
786                 if (*l == '\0') break; /* done */
787                 }
788
789         return(retval);
790         }
791
792 STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(const SSL_METHOD *ssl_method,
793                 STACK_OF(SSL_CIPHER) **cipher_list,
794                 STACK_OF(SSL_CIPHER) **cipher_list_by_id,
795                 const char *rule_str)
796         {
797         int ok, num_of_ciphers, num_of_alias_max, num_of_group_aliases;
798         unsigned long disabled_mask;
799         STACK_OF(SSL_CIPHER) *cipherstack;
800         const char *rule_p;
801         CIPHER_ORDER *co_list = NULL, *head = NULL, *tail = NULL, *curr;
802         SSL_CIPHER **ca_list = NULL;
803
804         /*
805          * Return with error if nothing to do.
806          */
807         if (rule_str == NULL) return(NULL);
808
809         if (init_ciphers)
810                 {
811                 CRYPTO_w_lock(CRYPTO_LOCK_SSL);
812                 if (init_ciphers) load_ciphers();
813                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL);
814                 }
815
816         /*
817          * To reduce the work to do we only want to process the compiled
818          * in algorithms, so we first get the mask of disabled ciphers.
819          */
820         disabled_mask = ssl_cipher_get_disabled();
821
822         /*
823          * Now we have to collect the available ciphers from the compiled
824          * in ciphers. We cannot get more than the number compiled in, so
825          * it is used for allocation.
826          */
827         num_of_ciphers = ssl_method->num_ciphers();
828 #ifdef KSSL_DEBUG
829         printf("ssl_create_cipher_list() for %d ciphers\n", num_of_ciphers);
830 #endif    /* KSSL_DEBUG */
831         co_list = (CIPHER_ORDER *)OPENSSL_malloc(sizeof(CIPHER_ORDER) * num_of_ciphers);
832         if (co_list == NULL)
833                 {
834                 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
835                 return(NULL);   /* Failure */
836                 }
837
838         ssl_cipher_collect_ciphers(ssl_method, num_of_ciphers, disabled_mask,
839                                    co_list, &head, &tail);
840
841         /*
842          * We also need cipher aliases for selecting based on the rule_str.
843          * There might be two types of entries in the rule_str: 1) names
844          * of ciphers themselves 2) aliases for groups of ciphers.
845          * For 1) we need the available ciphers and for 2) the cipher
846          * groups of cipher_aliases added together in one list (otherwise
847          * we would be happy with just the cipher_aliases table).
848          */
849         num_of_group_aliases = sizeof(cipher_aliases) / sizeof(SSL_CIPHER);
850         num_of_alias_max = num_of_ciphers + num_of_group_aliases + 1;
851         ca_list =
852                 (SSL_CIPHER **)OPENSSL_malloc(sizeof(SSL_CIPHER *) * num_of_alias_max);
853         if (ca_list == NULL)
854                 {
855                 OPENSSL_free(co_list);
856                 SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
857                 return(NULL);   /* Failure */
858                 }
859         ssl_cipher_collect_aliases(ca_list, num_of_group_aliases, disabled_mask,
860                                    head);
861
862         /*
863          * If the rule_string begins with DEFAULT, apply the default rule
864          * before using the (possibly available) additional rules.
865          */
866         ok = 1;
867         rule_p = rule_str;
868         if (strncmp(rule_str,"DEFAULT",7) == 0)
869                 {
870                 ok = ssl_cipher_process_rulestr(SSL_DEFAULT_CIPHER_LIST,
871                         co_list, &head, &tail, ca_list);
872                 rule_p += 7;
873                 if (*rule_p == ':')
874                         rule_p++;
875                 }
876
877         if (ok && (strlen(rule_p) > 0))
878                 ok = ssl_cipher_process_rulestr(rule_p, co_list, &head, &tail,
879                                                 ca_list);
880
881         OPENSSL_free(ca_list);  /* Not needed anymore */
882
883         if (!ok)
884                 {       /* Rule processing failure */
885                 OPENSSL_free(co_list);
886                 return(NULL);
887                 }
888         /*
889          * Allocate new "cipherstack" for the result, return with error
890          * if we cannot get one.
891          */
892         if ((cipherstack = sk_SSL_CIPHER_new_null()) == NULL)
893                 {
894                 OPENSSL_free(co_list);
895                 return(NULL);
896                 }
897
898         /*
899          * The cipher selection for the list is done. The ciphers are added
900          * to the resulting precedence to the STACK_OF(SSL_CIPHER).
901          */
902         for (curr = head; curr != NULL; curr = curr->next)
903                 {
904                 if (curr->active)
905                         {
906                         sk_SSL_CIPHER_push(cipherstack, curr->cipher);
907 #ifdef CIPHER_DEBUG
908                         printf("<%s>\n",curr->cipher->name);
909 #endif
910                         }
911                 }
912         OPENSSL_free(co_list);  /* Not needed any longer */
913
914         /*
915          * The following passage is a little bit odd. If pointer variables
916          * were supplied to hold STACK_OF(SSL_CIPHER) return information,
917          * the old memory pointed to is free()ed. Then, however, the
918          * cipher_list entry will be assigned just a copy of the returned
919          * cipher stack. For cipher_list_by_id a copy of the cipher stack
920          * will be created. See next comment...
921          */
922         if (cipher_list != NULL)
923                 {
924                 if (*cipher_list != NULL)
925                         sk_SSL_CIPHER_free(*cipher_list);
926                 *cipher_list = cipherstack;
927                 }
928
929         if (cipher_list_by_id != NULL)
930                 {
931                 if (*cipher_list_by_id != NULL)
932                         sk_SSL_CIPHER_free(*cipher_list_by_id);
933                 *cipher_list_by_id = sk_SSL_CIPHER_dup(cipherstack);
934                 }
935
936         /*
937          * Now it is getting really strange. If something failed during
938          * the previous pointer assignment or if one of the pointers was
939          * not requested, the error condition is met. That might be
940          * discussable. The strange thing is however that in this case
941          * the memory "ret" pointed to is "free()ed" and hence the pointer
942          * cipher_list becomes wild. The memory reserved for
943          * cipher_list_by_id however is not "free()ed" and stays intact.
944          */
945         if (    (cipher_list_by_id == NULL) ||
946                 (*cipher_list_by_id == NULL) ||
947                 (cipher_list == NULL) ||
948                 (*cipher_list == NULL))
949                 {
950                 sk_SSL_CIPHER_free(cipherstack);
951                 return(NULL);
952                 }
953
954         sk_SSL_CIPHER_set_cmp_func(*cipher_list_by_id,ssl_cipher_ptr_id_cmp);
955
956         return(cipherstack);
957         }
958
959 char *SSL_CIPHER_description(SSL_CIPHER *cipher, char *buf, int len)
960         {
961         int is_export,pkl,kl;
962         char *ver,*exp_str;
963         char *kx,*au,*enc,*mac;
964         unsigned long alg,alg2,alg_s;
965 #ifdef KSSL_DEBUG
966         static char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s AL=%lx\n";
967 #else
968         static char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s\n";
969 #endif /* KSSL_DEBUG */
970
971         alg=cipher->algorithms;
972         alg_s=cipher->algo_strength;
973         alg2=cipher->algorithm2;
974
975         is_export=SSL_C_IS_EXPORT(cipher);
976         pkl=SSL_C_EXPORT_PKEYLENGTH(cipher);
977         kl=SSL_C_EXPORT_KEYLENGTH(cipher);
978         exp_str=is_export?" export":"";
979         
980         if (alg & SSL_SSLV2)
981                 ver="SSLv2";
982         else if (alg & SSL_SSLV3)
983                 ver="SSLv3";
984         else
985                 ver="unknown";
986
987         switch (alg&SSL_MKEY_MASK)
988                 {
989         case SSL_kRSA:
990                 kx=is_export?(pkl == 512 ? "RSA(512)" : "RSA(1024)"):"RSA";
991                 break;
992         case SSL_kDHr:
993                 kx="DH/RSA";
994                 break;
995         case SSL_kDHd:
996                 kx="DH/DSS";
997                 break;
998         case SSL_kKRB5:         /* VRS */
999         case SSL_KRB5:          /* VRS */
1000             kx="KRB5";
1001             break;
1002         case SSL_kFZA:
1003                 kx="Fortezza";
1004                 break;
1005         case SSL_kEDH:
1006                 kx=is_export?(pkl == 512 ? "DH(512)" : "DH(1024)"):"DH";
1007                 break;
1008         case SSL_kECDH:
1009         case SSL_kECDHE:
1010                 kx=is_export?"ECDH(<=163)":"ECDH";
1011                 break;
1012         default:
1013                 kx="unknown";
1014                 }
1015
1016         switch (alg&SSL_AUTH_MASK)
1017                 {
1018         case SSL_aRSA:
1019                 au="RSA";
1020                 break;
1021         case SSL_aDSS:
1022                 au="DSS";
1023                 break;
1024         case SSL_aDH:
1025                 au="DH";
1026                 break;
1027         case SSL_aKRB5:         /* VRS */
1028         case SSL_KRB5:          /* VRS */
1029             au="KRB5";
1030             break;
1031         case SSL_aFZA:
1032         case SSL_aNULL:
1033                 au="None";
1034                 break;
1035         case SSL_aECDSA:
1036                 au="ECDSA";
1037                 break;
1038         default:
1039                 au="unknown";
1040                 break;
1041                 }
1042
1043         switch (alg&SSL_ENC_MASK)
1044                 {
1045         case SSL_DES:
1046                 enc=(is_export && kl == 5)?"DES(40)":"DES(56)";
1047                 break;
1048         case SSL_3DES:
1049                 enc="3DES(168)";
1050                 break;
1051         case SSL_RC4:
1052                 enc=is_export?(kl == 5 ? "RC4(40)" : "RC4(56)")
1053                   :((alg2&SSL2_CF_8_BYTE_ENC)?"RC4(64)":"RC4(128)");
1054                 break;
1055         case SSL_RC2:
1056                 enc=is_export?(kl == 5 ? "RC2(40)" : "RC2(56)"):"RC2(128)";
1057                 break;
1058         case SSL_IDEA:
1059                 enc="IDEA(128)";
1060                 break;
1061         case SSL_eFZA:
1062                 enc="Fortezza";
1063                 break;
1064         case SSL_eNULL:
1065                 enc="None";
1066                 break;
1067         case SSL_AES:
1068                 switch(cipher->strength_bits)
1069                         {
1070                 case 128: enc="AES(128)"; break;
1071                 case 192: enc="AES(192)"; break;
1072                 case 256: enc="AES(256)"; break;
1073                 default: enc="AES(?""?""?)"; break;
1074                         }
1075                 break;
1076         default:
1077                 enc="unknown";
1078                 break;
1079                 }
1080
1081         switch (alg&SSL_MAC_MASK)
1082                 {
1083         case SSL_MD5:
1084                 mac="MD5";
1085                 break;
1086         case SSL_SHA1:
1087                 mac="SHA1";
1088                 break;
1089         default:
1090                 mac="unknown";
1091                 break;
1092                 }
1093
1094         if (buf == NULL)
1095                 {
1096                 len=128;
1097                 buf=OPENSSL_malloc(len);
1098                 if (buf == NULL) return("OPENSSL_malloc Error");
1099                 }
1100         else if (len < 128)
1101                 return("Buffer too small");
1102
1103 #ifdef KSSL_DEBUG
1104         BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp_str,alg);
1105 #else
1106         BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp_str);
1107 #endif /* KSSL_DEBUG */
1108         return(buf);
1109         }
1110
1111 char *SSL_CIPHER_get_version(SSL_CIPHER *c)
1112         {
1113         int i;
1114
1115         if (c == NULL) return("(NONE)");
1116         i=(int)(c->id>>24L);
1117         if (i == 3)
1118                 return("TLSv1/SSLv3");
1119         else if (i == 2)
1120                 return("SSLv2");
1121         else
1122                 return("unknown");
1123         }
1124
1125 /* return the actual cipher being used */
1126 const char *SSL_CIPHER_get_name(SSL_CIPHER *c)
1127         {
1128         if (c != NULL)
1129                 return(c->name);
1130         return("(NONE)");
1131         }
1132
1133 /* number of bits for symmetric cipher */
1134 int SSL_CIPHER_get_bits(SSL_CIPHER *c, int *alg_bits)
1135         {
1136         int ret=0;
1137
1138         if (c != NULL)
1139                 {
1140                 if (alg_bits != NULL) *alg_bits = c->alg_bits;
1141                 ret = c->strength_bits;
1142                 }
1143         return(ret);
1144         }
1145
1146 SSL_COMP *ssl3_comp_find(STACK_OF(SSL_COMP) *sk, int n)
1147         {
1148         SSL_COMP *ctmp;
1149         int i,nn;
1150
1151         if ((n == 0) || (sk == NULL)) return(NULL);
1152         nn=sk_SSL_COMP_num(sk);
1153         for (i=0; i<nn; i++)
1154                 {
1155                 ctmp=sk_SSL_COMP_value(sk,i);
1156                 if (ctmp->id == n)
1157                         return(ctmp);
1158                 }
1159         return(NULL);
1160         }
1161
1162 STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void)
1163         {
1164         load_builtin_compressions();
1165         return(ssl_comp_methods);
1166         }
1167
1168 int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm)
1169         {
1170         SSL_COMP *comp;
1171
1172         if (cm == NULL || cm->type == NID_undef)
1173                 return 1;
1174
1175         /* According to draft-ietf-tls-compression-04.txt, the
1176            compression number ranges should be the following:
1177
1178            0 to 63:    methods defined by the IETF
1179            64 to 192:  external party methods assigned by IANA
1180            193 to 255: reserved for private use */
1181         if (id < 193 || id > 255)
1182                 {
1183                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,SSL_R_COMPRESSION_ID_NOT_WITHIN_PRIVATE_RANGE);
1184                 return 0;
1185                 }
1186
1187         MemCheck_off();
1188         comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
1189         comp->id=id;
1190         comp->method=cm;
1191         load_builtin_compressions();
1192         if (ssl_comp_methods
1193                 && !sk_SSL_COMP_find(ssl_comp_methods,comp))
1194                 {
1195                 OPENSSL_free(comp);
1196                 MemCheck_on();
1197                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,SSL_R_DUPLICATE_COMPRESSION_ID);
1198                 return(1);
1199                 }
1200         else if ((ssl_comp_methods == NULL)
1201                 || !sk_SSL_COMP_push(ssl_comp_methods,comp))
1202                 {
1203                 OPENSSL_free(comp);
1204                 MemCheck_on();
1205                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,ERR_R_MALLOC_FAILURE);
1206                 return(1);
1207                 }
1208         else
1209                 {
1210                 MemCheck_on();
1211                 return(0);
1212                 }
1213         }
1214
1215 const char *SSL_COMP_get_name(const COMP_METHOD *comp)
1216         {
1217         if (comp)
1218                 return comp->name;
1219         return NULL;
1220         }
1221