crypto/evp/names.c

   1 /* crypto/evp/names.c */
   2 /* Copyright (C) 1995-1997 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 "cryptlib.h"
  61 #include "evp.h"
  62 #include "objects.h"
  63
  64 typedef struct aliases_st {
  65         char *alias;
  66         /* This must be the last field becaue I will allocate things
  67          * so they go off the end of it */
  68         char name[4];
  69         } ALIASES;
  70
  71 static STACK /* ALIASES */ *aliases=NULL;
  72 static STACK /* EVP_CIPHERS */ *ciphers=NULL;
  73 static STACK /* EVP_MD */ *digests=NULL;
  74
  75 static int cipher_nid_cmp(a,b)
  76 EVP_CIPHER **a,**b;
  77         { return((*a)->nid - (*b)->nid); }
  78
  79 static int digest_type_cmp(a,b)
  80 EVP_MD **a,**b;
  81         { return((*a)->pkey_type - (*b)->pkey_type); }
  82
  83 int EVP_add_cipher(c)
  84 EVP_CIPHER *c;
  85         {
  86         int i;
  87
  88         if (ciphers == NULL)
  89                 {
  90                 ciphers=sk_new(cipher_nid_cmp);
  91                 if (ciphers == NULL) return(0);
  92                 }
  93         if ((i=sk_find(ciphers,(char *)c)) >= 0)
  94                 {
  95                 if (sk_value(ciphers,i) == (char *)c)
  96                         return(1);
  97                 sk_delete(ciphers,i);
  98                 }
  99         return(sk_push(ciphers,(char *)c));
 100         }
 101
 102 int EVP_add_digest(md)
 103 EVP_MD *md;
 104         {
 105         int i;
 106         char *n;
 107
 108         if (digests == NULL)
 109                 {
 110                 digests=sk_new(digest_type_cmp);
 111                 if (digests == NULL) return(0);
 112                 }
 113         if ((i=sk_find(digests,(char *)md)) >= 0)
 114                 {
 115                 if (sk_value(digests,i) == (char *)md)
 116                         return(1);
 117                 sk_delete(digests,i);
 118                 }
 119         if (md->type != md->pkey_type)
 120                 {
 121                 n=OBJ_nid2sn(md->pkey_type);
 122                 EVP_add_alias(n,OBJ_nid2sn(md->type));
 123                 EVP_add_alias(n,OBJ_nid2ln(md->type));
 124                 }
 125         sk_push(digests,(char *)md);
 126         return(1);
 127         }
 128
 129 static int alias_cmp(a,b)
 130 ALIASES **a,**b;
 131         {
 132         return(strcmp((*a)->alias,(*b)->alias));
 133         }
 134
 135 int EVP_add_alias(name,aname)
 136 char *name;
 137 char *aname;
 138         {
 139         int l1,l2,i;
 140         ALIASES *a;
 141         char *p;
 142
 143         if ((name == NULL) || (aname == NULL)) return(0);
 144         l1=strlen(name)+1;
 145         l2=strlen(aname)+1;
 146         i=sizeof(ALIASES)+l1+l2;
 147         if ((a=(ALIASES *)Malloc(i)) == NULL)
 148                 return(0);
 149         strcpy(a->name,name);
 150         p= &(a->name[l1]);
 151         strcpy(p,aname);
 152         a->alias=p;
 153
 154         if (aliases == NULL)
 155                 {
 156                 aliases=sk_new(alias_cmp);
 157                 if (aliases == NULL) goto err;
 158                 }
 159
 160         if ((i=sk_find(aliases,(char *)a)) >= 0)
 161                 Free(sk_delete(aliases,i));
 162         if (!sk_push(aliases,(char *)a)) goto err;
 163         return(1);
 164 err:
 165         return(0);
 166         }
 167
 168 int EVP_delete_alias(name)
 169 char *name;
 170         {
 171         ALIASES a;
 172         int i;
 173
 174         if (aliases != NULL)
 175                 {
 176                 a.alias=name;
 177                 if ((i=sk_find(aliases,(char *)&a)) >= 0)
 178                         {
 179                         Free(sk_delete(aliases,i));
 180                         return(1);
 181                         }
 182                 }
 183         return(0);
 184         }
 185
 186 EVP_CIPHER *EVP_get_cipherbyname(name)
 187 char *name;
 188         {
 189         int nid,num=6,i;
 190         EVP_CIPHER c,*cp;
 191         ALIASES a,*ap;
 192
 193         if (ciphers == NULL) return(NULL);
 194         for (;;)
 195                 {
 196                 if (num-- <= 0) return(NULL);
 197                 if (aliases != NULL)
 198                         {
 199                         a.alias=name;
 200                         i=sk_find(aliases,(char *)&a);
 201                         if (i >= 0)
 202                                 {
 203                                 ap=(ALIASES *)sk_value(aliases,i);
 204                                 name=ap->name;
 205                                 continue;
 206                                 }
 207                         }
 208
 209                 nid=OBJ_txt2nid(name);
 210                 c.nid=nid;
 211                 i=sk_find(ciphers,(char *)&c);
 212                 if (i >= 0)
 213                         {
 214                         cp=(EVP_CIPHER *)sk_value(ciphers,i);
 215                         return(cp);
 216                         }
 217                 else
 218                         return(NULL);
 219                 }
 220         }
 221
 222 EVP_MD *EVP_get_digestbyname(name)
 223 char *name;
 224         {
 225         int nid,num=6,i;
 226         EVP_MD c,*cp;
 227         ALIASES a,*ap;
 228
 229         if (digests == NULL) return(NULL);
 230
 231         for (;;)
 232                 {
 233                 if (num-- <= 0) return(NULL);
 234
 235                 if (aliases != NULL)
 236                         {
 237                         a.alias=name;
 238                         i=sk_find(aliases,(char *)&a);
 239                         if (i >= 0)
 240                                 {
 241                                 ap=(ALIASES *)sk_value(aliases,i);
 242                                 name=ap->name;
 243                                 continue;
 244                                 }
 245                         }
 246
 247                 nid=OBJ_txt2nid(name);
 248                 c.pkey_type=nid;
 249                 i=sk_find(digests,(char *)&c);
 250                 if (i >= 0)
 251                         {
 252                         cp=(EVP_MD *)sk_value(digests,i);
 253                         return(cp);
 254                         }
 255                 else
 256                         return(NULL);
 257                 }
 258         }
 259
 260 void EVP_cleanup()
 261         {
 262         int i;
 263
 264         if (aliases != NULL)
 265                 {
 266                 for (i=0; i<sk_num(aliases); i++)
 267                         Free(sk_value(aliases,i));
 268                 sk_free(aliases);
 269                 aliases=NULL;
 270                 }
 271         if (ciphers != NULL)
 272                 {
 273                 sk_free(ciphers);
 274                 ciphers=NULL;
 275                 }
 276         if (digests != NULL)
 277                 {
 278                 sk_free(digests);
 279                 digests=NULL;
 280                 }
 281         }