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 #ifndef OPENSSL_NO_DH
70 #include <openssl/dh.h>
71 #endif
72
73 #ifdef OPENSSL_FIPS
74 #include <openssl/fips.h>
75 #endif
76
77 const char DSA_version[]="DSA" OPENSSL_VERSION_PTEXT;
78
79 static const DSA_METHOD *default_DSA_method = NULL;
80
81 void DSA_set_default_method(const DSA_METHOD *meth)
82 {
83 default_DSA_method = meth;
84 }
85
86 const DSA_METHOD *DSA_get_default_method(void)
87 {
88 if(!default_DSA_method)
89 {
90 #ifdef OPENSSL_FIPS
91 if (FIPS_mode())
92 return FIPS_dsa_openssl();
93 else
94 return DSA_OpenSSL();
95 #else
96 default_DSA_method = DSA_OpenSSL();
97 #endif
98 }
99 return default_DSA_method;
100 }
101
102 DSA *DSA_new(void)
103 {
104 return DSA_new_method(NULL);
105 }
106
107 int DSA_set_method(DSA *dsa, const DSA_METHOD *meth)
108 {
109 /* NB: The caller is specifically setting a method, so it's not up to us
110 * to deal with which ENGINE it comes from. */
111 const DSA_METHOD *mtmp;
112 mtmp = dsa->meth;
113 if (mtmp->finish) mtmp->finish(dsa);
114 #ifndef OPENSSL_NO_ENGINE
115 if (dsa->engine)
116 {
117 ENGINE_finish(dsa->engine);
118 dsa->engine = NULL;
119 }
120 #endif
121 dsa->meth = meth;
122 if (meth->init) meth->init(dsa);
123 return 1;
124 }
125
126 DSA *DSA_new_method(ENGINE *engine)
127 {
128 DSA *ret;
129
130 ret=(DSA *)OPENSSL_malloc(sizeof(DSA));
131 if (ret == NULL)
132 {
133 DSAerr(DSA_F_DSA_NEW_METHOD,ERR_R_MALLOC_FAILURE);
134 return(NULL);
135 }
136 ret->meth = DSA_get_default_method();
137 #ifndef OPENSSL_NO_ENGINE
138 if (engine)
139 {
140 if (!ENGINE_init(engine))
141 {
142 DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
143 OPENSSL_free(ret);
144 return NULL;
145 }
146 ret->engine = engine;
147 }
148 else
149 ret->engine = ENGINE_get_default_DSA();
150 if(ret->engine)
151 {
152 ret->meth = ENGINE_get_DSA(ret->engine);
153 if(!ret->meth)
154 {
155 DSAerr(DSA_F_DSA_NEW_METHOD,
156 ERR_R_ENGINE_LIB);
157 ENGINE_finish(ret->engine);
158 OPENSSL_free(ret);
159 return NULL;
160 }
161 }
162 #endif
163
164 ret->pad=0;
165 ret->version=0;
166 ret->write_params=1;
167 ret->p=NULL;
168 ret->q=NULL;
169 ret->g=NULL;
170
171 ret->pub_key=NULL;
172 ret->priv_key=NULL;
173
174 ret->kinv=NULL;
175 ret->r=NULL;
176 ret->method_mont_p=NULL;
177
178 ret->references=1;
179 ret->flags=ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW;
180 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
181 if ((ret->meth->init != NULL) && !ret->meth->init(ret))
182 {
183 #ifndef OPENSSL_NO_ENGINE
184 if (ret->engine)
185 ENGINE_finish(ret->engine);
186 #endif
187 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
188 OPENSSL_free(ret);
189 ret=NULL;
190 }
191
192 return(ret);
193 }
194
195 void DSA_free(DSA *r)
196 {
197 int i;
198
199 if (r == NULL) return;
200
201 i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA);
202 #ifdef REF_PRINT
203 REF_PRINT("DSA",r);
204 #endif
205 if (i > 0) return;
206 #ifdef REF_CHECK
207 if (i < 0)
208 {
209 fprintf(stderr,"DSA_free, bad reference count\n");
210 abort();
211 }
212 #endif
213
214 if(r->meth->finish)
215 r->meth->finish(r);
216 #ifndef OPENSSL_NO_ENGINE
217 if(r->engine)
218 ENGINE_finish(r->engine);
219 #endif
220
221 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);
222
223 if (r->p != NULL) BN_clear_free(r->p);
224 if (r->q != NULL) BN_clear_free(r->q);
225 if (r->g != NULL) BN_clear_free(r->g);
226 if (r->pub_key != NULL) BN_clear_free(r->pub_key);
227 if (r->priv_key != NULL) BN_clear_free(r->priv_key);
228 if (r->kinv != NULL) BN_clear_free(r->kinv);
229 if (r->r != NULL) BN_clear_free(r->r);
230 OPENSSL_free(r);
231 }
232
233 int DSA_up_ref(DSA *r)
234 {
235 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA);
236 #ifdef REF_PRINT
237 REF_PRINT("DSA",r);
238 #endif
239 #ifdef REF_CHECK
240 if (i < 2)
241 {
242 fprintf(stderr, "DSA_up_ref, bad reference count\n");
243 abort();
244 }
245 #endif
246 return ((i > 1) ? 1 : 0);
247 }
248
249 int DSA_size(const DSA *r)
250 {
251 int ret,i;
252 ASN1_INTEGER bs;
253 unsigned char buf[4]; /* 4 bytes looks really small.
254 However, i2d_ASN1_INTEGER() will not look
255 beyond the first byte, as long as the second
256 parameter is NULL. */
257
258 i=BN_num_bits(r->q);
259 bs.length=(i+7)/8;
260 bs.data=buf;
261 bs.type=V_ASN1_INTEGER;
262 /* If the top bit is set the asn1 encoding is 1 larger. */
263 buf[0]=0xff;
264
265 i=i2d_ASN1_INTEGER(&bs,NULL);
266 i+=i; /* r and s */
267 ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE);
268 return(ret);
269 }
270
271 int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
272 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
273 {
274 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp,
275 new_func, dup_func, free_func);
276 }
277
278 int DSA_set_ex_data(DSA *d, int idx, void *arg)
279 {
280 return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
281 }
282
283 void *DSA_get_ex_data(DSA *d, int idx)
284 {
285 return(CRYPTO_get_ex_data(&d->ex_data,idx));
286 }
287
288 #ifndef OPENSSL_NO_DH
289 DH *DSA_dup_DH(const DSA *r)
290 {
291 /* DSA has p, q, g, optional pub_key, optional priv_key.
292 * DH has p, optional length, g, optional pub_key, optional priv_key,
293 * optional q.
294 */
295
296 DH *ret = NULL;
297
298 if (r == NULL)
299 goto err;
300 ret = DH_new();
301 if (ret == NULL)
302 goto err;
303 if (r->p != NULL)
304 if ((ret->p = BN_dup(r->p)) == NULL)
305 goto err;
306 if (r->q != NULL)
307 {
308 ret->length = BN_num_bits(r->q);
309 if ((ret->q = BN_dup(r->q)) == NULL)
310 goto err;
311 }
312 if (r->g != NULL)
313 if ((ret->g = BN_dup(r->g)) == NULL)
314 goto err;
315 if (r->pub_key != NULL)
316 if ((ret->pub_key = BN_dup(r->pub_key)) == NULL)
317 goto err;
318 if (r->priv_key != NULL)
319 if ((ret->priv_key = BN_dup(r->priv_key)) == NULL)
320 goto err;
321
322 return ret;
323
324 err:
325 if (ret != NULL)
326 DH_free(ret);
327 return NULL;
328 }
329 #endif