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 "objects.h"
  61 #include "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 EVP_CIPHER *ssl_cipher_methods[SSL_ENC_NUM_IDX]={
  74         NULL,NULL,NULL,NULL,NULL,NULL,
  75         };
  76
  77 static STACK /* 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 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         {0,SSL_TXT_ALL, 0,SSL_ALL,   0,SSL_ALL},        /* must be first */
 115         {0,SSL_TXT_kRSA,0,SSL_kRSA,  0,SSL_MKEY_MASK},
 116         {0,SSL_TXT_kDHr,0,SSL_kDHr,  0,SSL_MKEY_MASK},
 117         {0,SSL_TXT_kDHd,0,SSL_kDHd,  0,SSL_MKEY_MASK},
 118         {0,SSL_TXT_kEDH,0,SSL_kEDH,  0,SSL_MKEY_MASK},
 119         {0,SSL_TXT_kFZA,0,SSL_kFZA,  0,SSL_MKEY_MASK},
 120         {0,SSL_TXT_DH,  0,SSL_DH,    0,SSL_MKEY_MASK},
 121         {0,SSL_TXT_EDH, 0,SSL_EDH,   0,SSL_MKEY_MASK|SSL_AUTH_MASK},
 122
 123         {0,SSL_TXT_aRSA,0,SSL_aRSA,  0,SSL_AUTH_MASK},
 124         {0,SSL_TXT_aDSS,0,SSL_aDSS,  0,SSL_AUTH_MASK},
 125         {0,SSL_TXT_aFZA,0,SSL_aFZA,  0,SSL_AUTH_MASK},
 126         {0,SSL_TXT_aNULL,0,SSL_aNULL,0,SSL_AUTH_MASK},
 127         {0,SSL_TXT_aDH, 0,SSL_aDH,   0,SSL_AUTH_MASK},
 128         {0,SSL_TXT_DSS, 0,SSL_DSS,   0,SSL_AUTH_MASK},
 129
 130         {0,SSL_TXT_DES, 0,SSL_DES,   0,SSL_ENC_MASK},
 131         {0,SSL_TXT_3DES,0,SSL_3DES,  0,SSL_ENC_MASK},
 132         {0,SSL_TXT_RC4, 0,SSL_RC4,   0,SSL_ENC_MASK},
 133         {0,SSL_TXT_RC2, 0,SSL_RC2,   0,SSL_ENC_MASK},
 134         {0,SSL_TXT_IDEA,0,SSL_IDEA,  0,SSL_ENC_MASK},
 135         {0,SSL_TXT_eNULL,0,SSL_eNULL,0,SSL_ENC_MASK},
 136         {0,SSL_TXT_eFZA,0,SSL_eFZA,  0,SSL_ENC_MASK},
 137
 138         {0,SSL_TXT_MD5, 0,SSL_MD5,   0,SSL_MAC_MASK},
 139         {0,SSL_TXT_SHA1,0,SSL_SHA1,  0,SSL_MAC_MASK},
 140         {0,SSL_TXT_SHA, 0,SSL_SHA,   0,SSL_MAC_MASK},
 141
 142         {0,SSL_TXT_NULL,0,SSL_NULL,  0,SSL_ENC_MASK},
 143         {0,SSL_TXT_RSA, 0,SSL_RSA,   0,SSL_AUTH_MASK|SSL_MKEY_MASK},
 144         {0,SSL_TXT_ADH, 0,SSL_ADH,   0,SSL_AUTH_MASK|SSL_MKEY_MASK},
 145         {0,SSL_TXT_FZA, 0,SSL_FZA,   0,SSL_AUTH_MASK|SSL_MKEY_MASK|SSL_ENC_MASK},
 146
 147         {0,SSL_TXT_EXP, 0,SSL_EXP,   0,SSL_EXP_MASK},
 148         {0,SSL_TXT_EXPORT,0,SSL_EXPORT,0,SSL_EXP_MASK},
 149         {0,SSL_TXT_SSLV2,0,SSL_SSLV2,0,SSL_SSL_MASK},
 150         {0,SSL_TXT_SSLV3,0,SSL_SSLV3,0,SSL_SSL_MASK},
 151         {0,SSL_TXT_TLSV1,0,SSL_SSLV3,0,SSL_SSL_MASK},
 152         {0,SSL_TXT_LOW,  0,SSL_LOW,0,SSL_STRONG_MASK},
 153         {0,SSL_TXT_MEDIUM,0,SSL_MEDIUM,0,SSL_STRONG_MASK},
 154         {0,SSL_TXT_HIGH, 0,SSL_HIGH,0,SSL_STRONG_MASK},
 155         };
 156
 157 static int init_ciphers=1;
 158 static void load_ciphers();
 159
 160 static int cmp_by_name(a,b)
 161 SSL_CIPHER **a,**b;
 162         {
 163         return(strcmp((*a)->name,(*b)->name));
 164         }
 165
 166 static void load_ciphers()
 167         {
 168         init_ciphers=0;
 169         ssl_cipher_methods[SSL_ENC_DES_IDX]=
 170                 EVP_get_cipherbyname(SN_des_cbc);
 171         ssl_cipher_methods[SSL_ENC_3DES_IDX]=
 172                 EVP_get_cipherbyname(SN_des_ede3_cbc);
 173         ssl_cipher_methods[SSL_ENC_RC4_IDX]=
 174                 EVP_get_cipherbyname(SN_rc4);
 175         ssl_cipher_methods[SSL_ENC_RC2_IDX]=
 176                 EVP_get_cipherbyname(SN_rc2_cbc);
 177         ssl_cipher_methods[SSL_ENC_IDEA_IDX]=
 178                 EVP_get_cipherbyname(SN_idea_cbc);
 179
 180         ssl_digest_methods[SSL_MD_MD5_IDX]=
 181                 EVP_get_digestbyname(SN_md5);
 182         ssl_digest_methods[SSL_MD_SHA1_IDX]=
 183                 EVP_get_digestbyname(SN_sha1);
 184         }
 185
 186 int ssl_cipher_get_evp(s,enc,md,comp)
 187 SSL_SESSION *s;
 188 EVP_CIPHER **enc;
 189 EVP_MD **md;
 190 SSL_COMP **comp;
 191         {
 192         int i;
 193         SSL_CIPHER *c;
 194
 195         c=s->cipher;
 196         if (c == NULL) return(0);
 197         if (comp != NULL)
 198                 {
 199                 SSL_COMP ctmp;
 200
 201                 if (s->compress_meth == 0)
 202                         *comp=NULL;
 203                 else if (ssl_comp_methods == NULL)
 204                         {
 205                         /* bad */
 206                         *comp=NULL;
 207                         }
 208                 else
 209                         {
 210
 211                         ctmp.id=s->compress_meth;
 212                         i=sk_find(ssl_comp_methods,(char *)&ctmp);
 213                         if (i >= 0)
 214                                 *comp=(SSL_COMP *)sk_value(ssl_comp_methods,i);
 215                         else
 216                                 *comp=NULL;
 217                         }
 218                 }
 219
 220         if ((enc == NULL) || (md == NULL)) return(0);
 221
 222         switch (c->algorithms & SSL_ENC_MASK)
 223                 {
 224         case SSL_DES:
 225                 i=SSL_ENC_DES_IDX;
 226                 break;
 227         case SSL_3DES:
 228                 i=SSL_ENC_3DES_IDX;
 229                 break;
 230         case SSL_RC4:
 231                 i=SSL_ENC_RC4_IDX;
 232                 break;
 233         case SSL_RC2:
 234                 i=SSL_ENC_RC2_IDX;
 235                 break;
 236         case SSL_IDEA:
 237                 i=SSL_ENC_IDEA_IDX;
 238                 break;
 239         case SSL_eNULL:
 240                 i=SSL_ENC_NULL_IDX;
 241                 break;
 242         default:
 243                 i= -1;
 244                 break;
 245                 }
 246
 247         if ((i < 0) || (i > SSL_ENC_NUM_IDX))
 248                 *enc=NULL;
 249         else
 250                 {
 251                 if (i == SSL_ENC_NULL_IDX)
 252                         *enc=EVP_enc_null();
 253                 else
 254                         *enc=ssl_cipher_methods[i];
 255                 }
 256
 257         switch (c->algorithms & SSL_MAC_MASK)
 258                 {
 259         case SSL_MD5:
 260                 i=SSL_MD_MD5_IDX;
 261                 break;
 262         case SSL_SHA1:
 263                 i=SSL_MD_SHA1_IDX;
 264                 break;
 265         default:
 266                 i= -1;
 267                 break;
 268                 }
 269         if ((i < 0) || (i > SSL_MD_NUM_IDX))
 270                 *md=NULL;
 271         else
 272                 *md=ssl_digest_methods[i];
 273
 274         if ((*enc != NULL) && (*md != NULL))
 275                 return(1);
 276         else
 277                 return(0);
 278         }
 279
 280 #define ITEM_SEP(a) \
 281         (((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ','))
 282
 283 static void ll_append_tail(head,curr,tail)
 284 CIPHER_ORDER **head,*curr,**tail;
 285         {
 286         if (curr == *tail) return;
 287         if (curr == *head)
 288                 *head=curr->next;
 289         if (curr->prev != NULL)
 290                 curr->prev->next=curr->next;
 291         if (curr->next != NULL) /* should always be true */
 292                 curr->next->prev=curr->prev;
 293         (*tail)->next=curr;
 294         curr->prev= *tail;
 295         curr->next=NULL;
 296         *tail=curr;
 297         }
 298
 299 STACK *ssl_create_cipher_list(ssl_method,cipher_list,cipher_list_by_id,str)
 300 SSL_METHOD *ssl_method;
 301 STACK **cipher_list,**cipher_list_by_id;
 302 char *str;
 303         {
 304         SSL_CIPHER *c;
 305         char *l;
 306         STACK *ret=NULL,*ok=NULL;
 307 #define CL_BUF  40
 308         char buf[CL_BUF];
 309         char *tmp_str=NULL;
 310         unsigned long mask,algorithms,ma;
 311         char *start;
 312         int i,j,k,num=0,ch,multi;
 313         unsigned long al;
 314         STACK *ca_list=NULL;
 315         int current_x,num_x;
 316         CIPHER_CHOICE *ops=NULL;
 317         CIPHER_ORDER *list=NULL,*head=NULL,*tail=NULL,*curr,*tail2,*curr2;
 318         int list_num;
 319         int type;
 320         SSL_CIPHER c_tmp,*cp;
 321
 322         if (str == NULL) return(NULL);
 323
 324         if (strncmp(str,"DEFAULT",7) == 0)
 325                 {
 326                 i=strlen(str)+2+strlen(SSL_DEFAULT_CIPHER_LIST);
 327                 if ((tmp_str=Malloc(i)) == NULL)
 328                         {
 329                         SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
 330                         goto err;
 331                         }
 332                 strcpy(tmp_str,SSL_DEFAULT_CIPHER_LIST);
 333                 strcat(tmp_str,":");
 334                 strcat(tmp_str,&(str[7]));
 335                 str=tmp_str;
 336                 }
 337         if (init_ciphers) load_ciphers();
 338
 339         num=ssl_method->num_ciphers();
 340
 341         if ((ret=(STACK *)sk_new(NULL)) == NULL) goto err;
 342         if ((ca_list=(STACK *)sk_new(cmp_by_name)) == NULL) goto err;
 343
 344         mask =SSL_kFZA;
 345 #ifdef NO_RSA
 346         mask|=SSL_aRSA|SSL_kRSA;
 347 #endif
 348 #ifdef NO_DSA
 349         mask|=SSL_aDSS;
 350 #endif
 351 #ifdef NO_DH
 352         mask|=SSL_kDHr|SSL_kDHd|SSL_kEDH|SSL_aDH;
 353 #endif
 354
 355 #ifndef SSL_ALLOW_ENULL
 356         mask|=SSL_eNULL;
 357 #endif
 358
 359         mask|=(ssl_cipher_methods[SSL_ENC_DES_IDX ] == NULL)?SSL_DES :0;
 360         mask|=(ssl_cipher_methods[SSL_ENC_3DES_IDX] == NULL)?SSL_3DES:0;
 361         mask|=(ssl_cipher_methods[SSL_ENC_RC4_IDX ] == NULL)?SSL_RC4 :0;
 362         mask|=(ssl_cipher_methods[SSL_ENC_RC2_IDX ] == NULL)?SSL_RC2 :0;
 363         mask|=(ssl_cipher_methods[SSL_ENC_IDEA_IDX] == NULL)?SSL_IDEA:0;
 364         mask|=(ssl_cipher_methods[SSL_ENC_eFZA_IDX] == NULL)?SSL_eFZA:0;
 365
 366         mask|=(ssl_digest_methods[SSL_MD_MD5_IDX ] == NULL)?SSL_MD5 :0;
 367         mask|=(ssl_digest_methods[SSL_MD_SHA1_IDX] == NULL)?SSL_SHA1:0;
 368
 369         if ((list=(CIPHER_ORDER *)Malloc(sizeof(CIPHER_ORDER)*num)) == NULL)
 370                 goto err;
 371
 372         /* Get the initial list of ciphers */
 373         list_num=0;
 374         for (i=0; i<num; i++)
 375                 {
 376                 c=ssl_method->get_cipher((unsigned int)i);
 377                 /* drop those that use any of that is not available */
 378                 if ((c != NULL) && c->valid && !(c->algorithms & mask))
 379                         {
 380                         list[list_num].cipher=c;
 381                         list[list_num].next=NULL;
 382                         list[list_num].prev=NULL;
 383                         list[list_num].active=0;
 384                         list_num++;
 385                         if (!sk_push(ca_list,(char *)c)) goto err;
 386                         }
 387                 }
 388
 389         for (i=1; i<list_num-1; i++)
 390                 {
 391                 list[i].prev= &(list[i-1]);
 392                 list[i].next= &(list[i+1]);
 393                 }
 394         if (list_num > 0)
 395                 {
 396                 head= &(list[0]);
 397                 head->prev=NULL;
 398                 head->next= &(list[1]);
 399                 tail= &(list[list_num-1]);
 400                 tail->prev= &(list[list_num-2]);
 401                 tail->next=NULL;
 402                 }
 403
 404         /* special case */
 405         cipher_aliases[0].algorithms= ~mask;
 406
 407         /* get the aliases */
 408         k=sizeof(cipher_aliases)/sizeof(SSL_CIPHER);
 409         for (j=0; j<k; j++)
 410                 {
 411                 al=cipher_aliases[j].algorithms;
 412                 /* Drop those that are not relevent */
 413                 if ((al & mask) == al) continue;
 414                 if (!sk_push(ca_list,(char *)&(cipher_aliases[j]))) goto err;
 415                 }
 416
 417         /* ca_list now holds a 'stack' of SSL_CIPHERS, some real, some
 418          * 'aliases' */
 419
 420         /* how many parameters are there? */
 421         num=1;
 422         for (l=str; *l; l++)
 423                 if (ITEM_SEP(*l))
 424                         num++;
 425         ops=(CIPHER_CHOICE *)Malloc(sizeof(CIPHER_CHOICE)*num);
 426         if (ops == NULL) goto err;
 427         memset(ops,0,sizeof(CIPHER_CHOICE)*num);
 428
 429         /* we now parse the input string and create our operations */
 430         l=str;
 431         i=0;
 432         current_x=0;
 433
 434         for (;;)
 435                 {
 436                 ch= *l;
 437
 438                 if (ch == '\0') break;
 439
 440                 if (ch == '-')
 441                         { j=CIPHER_DEL; l++; }
 442                 else if (ch == '+')
 443                         { j=CIPHER_ORD; l++; }
 444                 else if (ch == '!')
 445                         { j=CIPHER_KILL; l++; }
 446                 else
 447                         { j=CIPHER_ADD; }
 448
 449                 if (ITEM_SEP(ch))
 450                         {
 451                         l++;
 452                         continue;
 453                         }
 454                 ops[current_x].type=j;
 455                 ops[current_x].algorithms=0;
 456                 ops[current_x].mask=0;
 457
 458                 start=l;
 459                 for (;;)
 460                         {
 461                         ch= *l;
 462                         i=0;
 463                         while ( ((ch >= 'A') && (ch <= 'Z')) ||
 464                                 ((ch >= '0') && (ch <= '9')) ||
 465                                 ((ch >= 'a') && (ch <= 'z')) ||
 466                                  (ch == '-'))
 467                                  {
 468                                  buf[i]=ch;
 469                                  ch= *(++l);
 470                                  i++;
 471                                  if (i >= (CL_BUF-2)) break;
 472                                  }
 473                         buf[i]='\0';
 474
 475                         /* check for multi-part specification */
 476                         if (ch == '+')
 477                                 {
 478                                 multi=1;
 479                                 l++;
 480                                 }
 481                         else
 482                                 multi=0;
 483
 484                         c_tmp.name=buf;
 485                         j=sk_find(ca_list,(char *)&c_tmp);
 486                         if (j < 0)
 487                                 goto end_loop;
 488
 489                         cp=(SSL_CIPHER *)sk_value(ca_list,j);
 490                         ops[current_x].algorithms|=cp->algorithms;
 491                         /* We add the SSL_SSL_MASK so we can match the
 492                          * SSLv2 and SSLv3 versions of RC4-MD5 */
 493                         ops[current_x].mask|=cp->mask;
 494                         if (!multi) break;
 495                         }
 496                 current_x++;
 497                 if (ch == '\0') break;
 498 end_loop:
 499                 /* Make sure we scan until the next valid start point */
 500                 while ((*l != '\0') && ITEM_SEP(*l))
 501                         l++;
 502                 }
 503
 504         num_x=current_x;
 505         current_x=0;
 506
 507         /* We will now process the list of ciphers, once for each category, to
 508          * decide what we should do with it. */
 509         for (j=0; j<num_x; j++)
 510                 {
 511                 algorithms=ops[j].algorithms;
 512                 type=ops[j].type;
 513                 mask=ops[j].mask;
 514
 515                 curr=head;
 516                 curr2=head;
 517                 tail2=tail;
 518                 for (;;)
 519                         {
 520                         if ((curr == NULL) || (curr == tail2)) break;
 521                         curr=curr2;
 522                         curr2=curr->next;
 523
 524                         cp=curr->cipher;
 525                         ma=mask & cp->algorithms;
 526                         if ((ma == 0) || ((ma & algorithms) != ma))
 527                                 {
 528                                 /* does not apply */
 529                                 continue;
 530                                 }
 531
 532                         /* add the cipher if it has not been added yet. */
 533                         if (type == CIPHER_ADD)
 534                                 {
 535                                 if (!curr->active)
 536                                         {
 537                                         ll_append_tail(&head,curr,&tail);
 538                                         curr->active=1;
 539                                         }
 540                                 }
 541                         /* Move the added cipher to this location */
 542                         else if (type == CIPHER_ORD)
 543                                 {
 544                                 if (curr->active)
 545                                         {
 546                                         ll_append_tail(&head,curr,&tail);
 547                                         }
 548                                 }
 549                         else if (type == CIPHER_DEL)
 550                                 curr->active=0;
 551                         if (type == CIPHER_KILL)
 552                                 {
 553                                 if (head == curr)
 554                                         head=curr->next;
 555                                 else
 556                                         curr->prev->next=curr->next;
 557                                 if (tail == curr)
 558                                         tail=curr->prev;
 559                                 curr->active=0;
 560                                 if (curr->next != NULL)
 561                                         curr->next->prev=curr->prev;
 562                                 if (curr->prev != NULL)
 563                                         curr->prev->next=curr->next;
 564                                 curr->next=NULL;
 565                                 curr->prev=NULL;
 566                                 }
 567                         }
 568                 }
 569
 570         for (curr=head; curr != NULL; curr=curr->next)
 571                 {
 572                 if (curr->active)
 573                         {
 574                         sk_push(ret,(char *)curr->cipher);
 575 #ifdef CIPHER_DEBUG
 576                         printf("<%s>\n",curr->cipher->name);
 577 #endif
 578                         }
 579                 }
 580
 581         if (cipher_list != NULL)
 582                 {
 583                 if (*cipher_list != NULL)
 584                         sk_free(*cipher_list);
 585                 *cipher_list=ret;
 586                 }
 587
 588         if (cipher_list_by_id != NULL)
 589                 {
 590                 if (*cipher_list_by_id != NULL)
 591                         sk_free(*cipher_list_by_id);
 592                 *cipher_list_by_id=sk_dup(ret);
 593                 }
 594
 595         if (    (cipher_list_by_id == NULL) ||
 596                 (*cipher_list_by_id == NULL) ||
 597                 (cipher_list == NULL) ||
 598                 (*cipher_list == NULL))
 599                 goto err;
 600         sk_set_cmp_func(*cipher_list_by_id,ssl_cipher_ptr_id_cmp);
 601
 602         ok=ret;
 603         ret=NULL;
 604 err:
 605         if (tmp_str) Free(tmp_str);
 606         if (ops != NULL) Free(ops);
 607         if (ret != NULL) sk_free(ret);
 608         if (ca_list != NULL) sk_free(ca_list);
 609         if (list != NULL) Free(list);
 610         return(ok);
 611         }
 612
 613 char *SSL_CIPHER_description(cipher,buf,len)
 614 SSL_CIPHER *cipher;
 615 char *buf;
 616 int len;
 617         {
 618         int export;
 619         char *ver,*exp;
 620         char *kx,*au,*enc,*mac;
 621         unsigned long alg,alg2;
 622         static char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s\n";
 623
 624         alg=cipher->algorithms;
 625         alg2=cipher->algorithm2;
 626
 627         export=(alg&SSL_EXP)?1:0;
 628         exp=(export)?" export":"";
 629
 630         if (alg & SSL_SSLV2)
 631                 ver="SSLv2";
 632         else if (alg & SSL_SSLV3)
 633                 ver="SSLv3";
 634         else
 635                 ver="unknown";
 636
 637         switch (alg&SSL_MKEY_MASK)
 638                 {
 639         case SSL_kRSA:
 640                 kx=(export)?"RSA(512)":"RSA";
 641                 break;
 642         case SSL_kDHr:
 643                 kx="DH/RSA";
 644                 break;
 645         case SSL_kDHd:
 646                 kx="DH/DSS";
 647                 break;
 648         case SSL_kFZA:
 649                 kx="Fortezza";
 650                 break;
 651         case SSL_kEDH:
 652                 kx=(export)?"DH(512)":"DH";
 653                 break;
 654         default:
 655                 kx="unknown";
 656                 }
 657
 658         switch (alg&SSL_AUTH_MASK)
 659                 {
 660         case SSL_aRSA:
 661                 au="RSA";
 662                 break;
 663         case SSL_aDSS:
 664                 au="DSS";
 665                 break;
 666         case SSL_aDH:
 667                 au="DH";
 668                 break;
 669         case SSL_aFZA:
 670         case SSL_aNULL:
 671                 au="None";
 672                 break;
 673         default:
 674                 au="unknown";
 675                 break;
 676                 }
 677
 678         switch (alg&SSL_ENC_MASK)
 679                 {
 680         case SSL_DES:
 681                 enc=export?"DES(40)":"DES(56)";
 682                 break;
 683         case SSL_3DES:
 684                 enc="3DES(168)";
 685                 break;
 686         case SSL_RC4:
 687                 enc=export?"RC4(40)":((alg2&SSL2_CF_8_BYTE_ENC)?"RC4(64)":"RC4(128)");
 688                 break;
 689         case SSL_RC2:
 690                 enc=export?"RC2(40)":"RC2(128)";
 691                 break;
 692         case SSL_IDEA:
 693                 enc="IDEA(128)";
 694                 break;
 695         case SSL_eFZA:
 696                 enc="Fortezza";
 697                 break;
 698         case SSL_eNULL:
 699                 enc="None";
 700                 break;
 701         default:
 702                 enc="unknown";
 703                 break;
 704                 }
 705
 706         switch (alg&SSL_MAC_MASK)
 707                 {
 708         case SSL_MD5:
 709                 mac="MD5";
 710                 break;
 711         case SSL_SHA1:
 712                 mac="SHA1";
 713                 break;
 714         default:
 715                 mac="unknown";
 716                 break;
 717                 }
 718
 719         if (buf == NULL)
 720                 {
 721                 buf=Malloc(128);
 722                 if (buf == NULL) return("Malloc Error");
 723                 }
 724         else if (len < 128)
 725                 return("Buffer too small");
 726
 727         sprintf(buf,format,cipher->name,ver,kx,au,enc,mac,exp);
 728         return(buf);
 729         }
 730
 731 char *SSL_CIPHER_get_version(c)
 732 SSL_CIPHER *c;
 733         {
 734         int i;
 735
 736         if (c == NULL) return("(NONE)");
 737         i=(int)(c->id>>24L);
 738         if (i == 3)
 739                 return("TLSv1/SSLv3");
 740         else if (i == 2)
 741                 return("SSLv2");
 742         else
 743                 return("unknown");
 744         }
 745
 746 /* return the actual cipher being used */
 747 char *SSL_CIPHER_get_name(c)
 748 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(c,alg_bits)
 757 SSL_CIPHER *c;
 758 int *alg_bits;
 759         {
 760         int ret=0,a=0;
 761         EVP_CIPHER *enc;
 762         EVP_MD *md;
 763         SSL_SESSION ss;
 764
 765         if (c != NULL)
 766                 {
 767                 ss.cipher=c;
 768                 if (!ssl_cipher_get_evp(&ss,&enc,&md,NULL))
 769                         return(0);
 770
 771                 a=EVP_CIPHER_key_length(enc)*8;
 772
 773                 if (c->algorithms & SSL_EXP)
 774                         {
 775                         ret=40;
 776                         }
 777                 else
 778                         {
 779                         if (c->algorithm2 & SSL2_CF_8_BYTE_ENC)
 780                                 ret=64;
 781                         else
 782                                 ret=a;
 783                         }
 784                 }
 785
 786         if (alg_bits != NULL) *alg_bits=a;
 787
 788         return(ret);
 789         }
 790
 791 SSL_COMP *ssl3_comp_find(sk,n)
 792 STACK *sk;
 793 int n;
 794         {
 795         SSL_COMP *ctmp;
 796         int i,nn;
 797
 798         if ((n == 0) || (sk == NULL)) return(NULL);
 799         nn=sk_num(sk);
 800         for (i=0; i<nn; i++)
 801                 {
 802                 ctmp=(SSL_COMP *)sk_value(sk,i);
 803                 if (ctmp->id == n)
 804                         return(ctmp);
 805                 }
 806         return(NULL);
 807         }
 808
 809 static int sk_comp_cmp(a,b)
 810 SSL_COMP **a,**b;
 811         {
 812         return((*a)->id-(*b)->id);
 813         }
 814
 815 STACK *SSL_COMP_get_compression_methods()
 816         {
 817         return(ssl_comp_methods);
 818         }
 819
 820 int SSL_COMP_add_compression_method(id,cm)
 821 int id;
 822 COMP_METHOD *cm;
 823         {
 824         SSL_COMP *comp;
 825         STACK *sk;
 826
 827         comp=(SSL_COMP *)Malloc(sizeof(SSL_COMP));
 828         comp->id=id;
 829         comp->method=cm;
 830         if (ssl_comp_methods == NULL)
 831                 sk=ssl_comp_methods=sk_new(sk_comp_cmp);
 832         else
 833                 sk=ssl_comp_methods;
 834         if ((sk == NULL) || !sk_push(sk,(char *)comp))
 835                 {
 836                 SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,ERR_R_MALLOC_FAILURE);
 837                 return(0);
 838                 }
 839         else
 840                 return(1);
 841         }
 842