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
70 const char DSA_version[]="DSA" OPENSSL_VERSION_PTEXT;
71
72 static const DSA_METHOD *default_DSA_method = NULL;
73
DSA_set_default_method(const DSA_METHOD * meth)74 void DSA_set_default_method(const DSA_METHOD *meth)
75 {
76 default_DSA_method = meth;
77 }
78
DSA_get_default_method(void)79 const DSA_METHOD *DSA_get_default_method(void)
80 {
81 if(!default_DSA_method)
82 default_DSA_method = DSA_OpenSSL();
83 return default_DSA_method;
84 }
85
DSA_new(void)86 DSA *DSA_new(void)
87 {
88 return DSA_new_method(NULL);
89 }
90
DSA_set_method(DSA * dsa,const DSA_METHOD * meth)91 int DSA_set_method(DSA *dsa, const DSA_METHOD *meth)
92 {
93 /* NB: The caller is specifically setting a method, so it's not up to us
94 * to deal with which ENGINE it comes from. */
95 const DSA_METHOD *mtmp;
96 mtmp = dsa->meth;
97 if (mtmp->finish) mtmp->finish(dsa);
98 #ifndef OPENSSL_NO_ENGINE
99 if (dsa->engine)
100 {
101 ENGINE_finish(dsa->engine);
102 dsa->engine = NULL;
103 }
104 #endif
105 dsa->meth = meth;
106 if (meth->init) meth->init(dsa);
107 return 1;
108 }
109
DSA_new_method(ENGINE * engine)110 DSA *DSA_new_method(ENGINE *engine)
111 {
112 DSA *ret;
113
114 ret=(DSA *)OPENSSL_malloc(sizeof(DSA));
115 if (ret == NULL)
116 {
117 DSAerr(DSA_F_DSA_NEW_METHOD,ERR_R_MALLOC_FAILURE);
118 return(NULL);
119 }
120 ret->meth = DSA_get_default_method();
121 #ifndef OPENSSL_NO_ENGINE
122 if (engine)
123 {
124 if (!ENGINE_init(engine))
125 {
126 DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
127 OPENSSL_free(ret);
128 return NULL;
129 }
130 ret->engine = engine;
131 }
132 else
133 ret->engine = ENGINE_get_default_DSA();
134 if(ret->engine)
135 {
136 ret->meth = ENGINE_get_DSA(ret->engine);
137 if(!ret->meth)
138 {
139 DSAerr(DSA_F_DSA_NEW_METHOD,
140 ERR_R_ENGINE_LIB);
141 ENGINE_finish(ret->engine);
142 OPENSSL_free(ret);
143 return NULL;
144 }
145 }
146 #endif
147
148 ret->pad=0;
149 ret->version=0;
150 ret->write_params=1;
151 ret->p=NULL;
152 ret->q=NULL;
153 ret->g=NULL;
154
155 ret->pub_key=NULL;
156 ret->priv_key=NULL;
157
158 ret->kinv=NULL;
159 ret->r=NULL;
160 ret->method_mont_p=NULL;
161
162 ret->references=1;
163 ret->flags=ret->meth->flags;
164 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
165 if ((ret->meth->init != NULL) && !ret->meth->init(ret))
166 {
167 #ifndef OPENSSL_NO_ENGINE
168 if (ret->engine)
169 ENGINE_finish(ret->engine);
170 #endif
171 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
172 OPENSSL_free(ret);
173 ret=NULL;
174 }
175
176 return(ret);
177 }
178
DSA_free(DSA * r)179 void DSA_free(DSA *r)
180 {
181 int i;
182
183 if (r == NULL) return;
184
185 i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA);
186 #ifdef REF_PRINT
187 REF_PRINT("DSA",r);
188 #endif
189 if (i > 0) return;
190 #ifdef REF_CHECK
191 if (i < 0)
192 {
193 fprintf(stderr,"DSA_free, bad reference count\n");
194 abort();
195 }
196 #endif
197
198 if(r->meth->finish)
199 r->meth->finish(r);
200 #ifndef OPENSSL_NO_ENGINE
201 if(r->engine)
202 ENGINE_finish(r->engine);
203 #endif
204
205 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);
206
207 if (r->p != NULL) BN_clear_free(r->p);
208 if (r->q != NULL) BN_clear_free(r->q);
209 if (r->g != NULL) BN_clear_free(r->g);
210 if (r->pub_key != NULL) BN_clear_free(r->pub_key);
211 if (r->priv_key != NULL) BN_clear_free(r->priv_key);
212 if (r->kinv != NULL) BN_clear_free(r->kinv);
213 if (r->r != NULL) BN_clear_free(r->r);
214 OPENSSL_free(r);
215 }
216
DSA_up_ref(DSA * r)217 int DSA_up_ref(DSA *r)
218 {
219 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA);
220 #ifdef REF_PRINT
221 REF_PRINT("DSA",r);
222 #endif
223 #ifdef REF_CHECK
224 if (i < 2)
225 {
226 fprintf(stderr, "DSA_up_ref, bad reference count\n");
227 abort();
228 }
229 #endif
230 return ((i > 1) ? 1 : 0);
231 }
232
DSA_get_ex_new_index(long argl,void * argp,CRYPTO_EX_new * new_func,CRYPTO_EX_dup * dup_func,CRYPTO_EX_free * free_func)233 int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
234 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
235 {
236 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp,
237 new_func, dup_func, free_func);
238 }
239
DSA_set_ex_data(DSA * d,int idx,void * arg)240 int DSA_set_ex_data(DSA *d, int idx, void *arg)
241 {
242 return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
243 }
244
DSA_get_ex_data(DSA * d,int idx)245 void *DSA_get_ex_data(DSA *d, int idx)
246 {
247 return(CRYPTO_get_ex_data(&d->ex_data,idx));
248 }
249
DSA_SIG_new(void)250 DSA_SIG *DSA_SIG_new(void)
251 {
252 DSA_SIG *sig;
253 sig = OPENSSL_malloc(sizeof(DSA_SIG));
254 if (!sig)
255 return NULL;
256 sig->r = NULL;
257 sig->s = NULL;
258 return sig;
259 }
260
DSA_SIG_free(DSA_SIG * sig)261 void DSA_SIG_free(DSA_SIG *sig)
262 {
263 if (sig)
264 {
265 if (sig->r)
266 BN_free(sig->r);
267 if (sig->s)
268 BN_free(sig->s);
269 OPENSSL_free(sig);
270 }
271 }
272
273 #ifndef OPENSSL_NO_DH
DSA_dup_DH(const DSA * r)274 DH *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
310