Import of openssl-0.9.8, a feature release.
[dragonfly.git] / crypto / openssl-0.9 / crypto / dsa / dsa_lib.c
CommitLineData
56276539
SS
1/* crypto/dsa/dsa_lib.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/* Original version from Steven Schoch <schoch@sheba.arc.nasa.gov> */
60
61#include <stdio.h>
62#include "cryptlib.h"
63#include <openssl/bn.h>
64#include <openssl/dsa.h>
65#include <openssl/asn1.h>
66#ifndef OPENSSL_NO_ENGINE
67#include <openssl/engine.h>
68#endif
69#include <openssl/dh.h>
70
71const char *DSA_version="DSA" OPENSSL_VERSION_PTEXT;
72
73static const DSA_METHOD *default_DSA_method = NULL;
74
75void DSA_set_default_method(const DSA_METHOD *meth)
76 {
77 default_DSA_method = meth;
78 }
79
80const DSA_METHOD *DSA_get_default_method(void)
81 {
82 if(!default_DSA_method)
83 default_DSA_method = DSA_OpenSSL();
84 return default_DSA_method;
85 }
86
87DSA *DSA_new(void)
88 {
89 return DSA_new_method(NULL);
90 }
91
92int DSA_set_method(DSA *dsa, const DSA_METHOD *meth)
93 {
94 /* NB: The caller is specifically setting a method, so it's not up to us
95 * to deal with which ENGINE it comes from. */
96 const DSA_METHOD *mtmp;
97 mtmp = dsa->meth;
98 if (mtmp->finish) mtmp->finish(dsa);
99#ifndef OPENSSL_NO_ENGINE
100 if (dsa->engine)
101 {
102 ENGINE_finish(dsa->engine);
103 dsa->engine = NULL;
104 }
105#endif
106 dsa->meth = meth;
107 if (meth->init) meth->init(dsa);
108 return 1;
109 }
110
111DSA *DSA_new_method(ENGINE *engine)
112 {
113 DSA *ret;
114
115 ret=(DSA *)OPENSSL_malloc(sizeof(DSA));
116 if (ret == NULL)
117 {
118 DSAerr(DSA_F_DSA_NEW_METHOD,ERR_R_MALLOC_FAILURE);
119 return(NULL);
120 }
121 ret->meth = DSA_get_default_method();
122#ifndef OPENSSL_NO_ENGINE
123 if (engine)
124 {
125 if (!ENGINE_init(engine))
126 {
127 DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
128 OPENSSL_free(ret);
129 return NULL;
130 }
131 ret->engine = engine;
132 }
133 else
134 ret->engine = ENGINE_get_default_DSA();
135 if(ret->engine)
136 {
137 ret->meth = ENGINE_get_DSA(ret->engine);
138 if(!ret->meth)
139 {
140 DSAerr(DSA_F_DSA_NEW_METHOD,
141 ERR_R_ENGINE_LIB);
142 ENGINE_finish(ret->engine);
143 OPENSSL_free(ret);
144 return NULL;
145 }
146 }
147#endif
148
149 ret->pad=0;
150 ret->version=0;
151 ret->write_params=1;
152 ret->p=NULL;
153 ret->q=NULL;
154 ret->g=NULL;
155
156 ret->pub_key=NULL;
157 ret->priv_key=NULL;
158
159 ret->kinv=NULL;
160 ret->r=NULL;
161 ret->method_mont_p=NULL;
162
163 ret->references=1;
164 ret->flags=ret->meth->flags;
165 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
166 if ((ret->meth->init != NULL) && !ret->meth->init(ret))
167 {
168#ifndef OPENSSL_NO_ENGINE
169 if (ret->engine)
170 ENGINE_finish(ret->engine);
171#endif
172 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
173 OPENSSL_free(ret);
174 ret=NULL;
175 }
176
177 return(ret);
178 }
179
180void DSA_free(DSA *r)
181 {
182 int i;
183
184 if (r == NULL) return;
185
186 i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA);
187#ifdef REF_PRINT
188 REF_PRINT("DSA",r);
189#endif
190 if (i > 0) return;
191#ifdef REF_CHECK
192 if (i < 0)
193 {
194 fprintf(stderr,"DSA_free, bad reference count\n");
195 abort();
196 }
197#endif
198
199 if(r->meth->finish)
200 r->meth->finish(r);
201#ifndef OPENSSL_NO_ENGINE
202 if(r->engine)
203 ENGINE_finish(r->engine);
204#endif
205
206 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);
207
208 if (r->p != NULL) BN_clear_free(r->p);
209 if (r->q != NULL) BN_clear_free(r->q);
210 if (r->g != NULL) BN_clear_free(r->g);
211 if (r->pub_key != NULL) BN_clear_free(r->pub_key);
212 if (r->priv_key != NULL) BN_clear_free(r->priv_key);
213 if (r->kinv != NULL) BN_clear_free(r->kinv);
214 if (r->r != NULL) BN_clear_free(r->r);
215 OPENSSL_free(r);
216 }
217
218int DSA_up_ref(DSA *r)
219 {
220 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA);
221#ifdef REF_PRINT
222 REF_PRINT("DSA",r);
223#endif
224#ifdef REF_CHECK
225 if (i < 2)
226 {
227 fprintf(stderr, "DSA_up_ref, bad reference count\n");
228 abort();
229 }
230#endif
231 return ((i > 1) ? 1 : 0);
232 }
233
234int DSA_size(const DSA *r)
235 {
236 int ret,i;
237 ASN1_INTEGER bs;
238 unsigned char buf[4]; /* 4 bytes looks really small.
239 However, i2d_ASN1_INTEGER() will not look
240 beyond the first byte, as long as the second
241 parameter is NULL. */
242
243 i=BN_num_bits(r->q);
244 bs.length=(i+7)/8;
245 bs.data=buf;
246 bs.type=V_ASN1_INTEGER;
247 /* If the top bit is set the asn1 encoding is 1 larger. */
248 buf[0]=0xff;
249
250 i=i2d_ASN1_INTEGER(&bs,NULL);
251 i+=i; /* r and s */
252 ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE);
253 return(ret);
254 }
255
256int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
257 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
258 {
259 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp,
260 new_func, dup_func, free_func);
261 }
262
263int DSA_set_ex_data(DSA *d, int idx, void *arg)
264 {
265 return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
266 }
267
268void *DSA_get_ex_data(DSA *d, int idx)
269 {
270 return(CRYPTO_get_ex_data(&d->ex_data,idx));
271 }
272
273#ifndef OPENSSL_NO_DH
274DH *DSA_dup_DH(const DSA *r)
275 {
276 /* DSA has p, q, g, optional pub_key, optional priv_key.
277 * DH has p, optional length, g, optional pub_key, optional priv_key.
278 */
279
280 DH *ret = NULL;
281
282 if (r == NULL)
283 goto err;
284 ret = DH_new();
285 if (ret == NULL)
286 goto err;
287 if (r->p != NULL)
288 if ((ret->p = BN_dup(r->p)) == NULL)
289 goto err;
290 if (r->q != NULL)
291 ret->length = BN_num_bits(r->q);
292 if (r->g != NULL)
293 if ((ret->g = BN_dup(r->g)) == NULL)
294 goto err;
295 if (r->pub_key != NULL)
296 if ((ret->pub_key = BN_dup(r->pub_key)) == NULL)
297 goto err;
298 if (r->priv_key != NULL)
299 if ((ret->priv_key = BN_dup(r->priv_key)) == NULL)
300 goto err;
301
302 return ret;
303
304 err:
305 if (ret != NULL)
306 DH_free(ret);
307 return NULL;
308 }
309#endif