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1/* crypto/evp/names.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 "cryptlib.h"
61#include "evp.h"
62#include "objects.h"
63
64typedef 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
71static STACK /* ALIASES */ *aliases=NULL;
72static STACK /* EVP_CIPHERS */ *ciphers=NULL;
73static STACK /* EVP_MD */ *digests=NULL;
74
75static int cipher_nid_cmp(a,b)
76EVP_CIPHER **a,**b;
77 { return((*a)->nid - (*b)->nid); }
78
79static int digest_type_cmp(a,b)
80EVP_MD **a,**b;
81 { return((*a)->pkey_type - (*b)->pkey_type); }
82
83int EVP_add_cipher(c)
84EVP_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
102int EVP_add_digest(md)
103EVP_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
129static int alias_cmp(a,b)
130ALIASES **a,**b;
131 {
132 return(strcmp((*a)->alias,(*b)->alias));
133 }
134
135int EVP_add_alias(name,aname)
136char *name;
137char *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 {
162 Free(sk_delete(aliases,i));
163 }
164 if (!sk_push(aliases,(char *)a)) goto err;
165 return(1);
166err:
167 return(0);
168 }
169
170int EVP_delete_alias(name)
171char *name;
172 {
173 ALIASES a;
174 int i;
175
176 if (aliases != NULL)
177 {
178 a.alias=name;
179 if ((i=sk_find(aliases,(char *)&a)) >= 0)
180 {
181 Free(sk_delete(aliases,i));
182 return(1);
183 }
184 }
185 return(0);
186 }
187
188EVP_CIPHER *EVP_get_cipherbyname(name)
189char *name;
190 {
191 int nid,num=6,i;
192 EVP_CIPHER c,*cp;
193 ALIASES a,*ap;
194
195 if (ciphers == NULL) return(NULL);
196 for (;;)
197 {
198 if (num-- <= 0) return(NULL);
199 if (aliases != NULL)
200 {
201 a.alias=name;
202 i=sk_find(aliases,(char *)&a);
203 if (i >= 0)
204 {
205 ap=(ALIASES *)sk_value(aliases,i);
206 name=ap->name;
207 continue;
208 }
209 }
210
211 nid=OBJ_txt2nid(name);
212 if (nid == NID_undef) return(NULL);
213 c.nid=nid;
214 i=sk_find(ciphers,(char *)&c);
215 if (i >= 0)
216 {
217 cp=(EVP_CIPHER *)sk_value(ciphers,i);
218 return(cp);
219 }
220 else
221 return(NULL);
222 }
223 }
224
225EVP_MD *EVP_get_digestbyname(name)
226char *name;
227 {
228 int nid,num=6,i;
229 EVP_MD c,*cp;
230 ALIASES a,*ap;
231
232 if (digests == NULL) return(NULL);
233
234 for (;;)
235 {
236 if (num-- <= 0) return(NULL);
237
238 if (aliases != NULL)
239 {
240 a.alias=name;
241 i=sk_find(aliases,(char *)&a);
242 if (i >= 0)
243 {
244 ap=(ALIASES *)sk_value(aliases,i);
245 name=ap->name;
246 continue;
247 }
248 }
249
250 nid=OBJ_txt2nid(name);
251 if (nid == NID_undef) return(NULL);
252 c.pkey_type=nid;
253 i=sk_find(digests,(char *)&c);
254 if (i >= 0)
255 {
256 cp=(EVP_MD *)sk_value(digests,i);
257 return(cp);
258 }
259 else
260 return(NULL);
261 }
262 }
263
264void EVP_cleanup()
265 {
266 int i;
267
268 if (aliases != NULL)
269 {
270 for (i=0; i<sk_num(aliases); i++)
271 Free(sk_value(aliases,i));
272 sk_free(aliases);
273 aliases=NULL;
274 }
275 if (ciphers != NULL)
276 {
277 sk_free(ciphers);
278 ciphers=NULL;
279 }
280 if (digests != NULL)
281 {
282 sk_free(digests);
283 digests=NULL;
284 }
285 }
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