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
DSA_set_default_method(const DSA_METHOD * meth)81 void DSA_set_default_method(const DSA_METHOD *meth)
82 {
83 default_DSA_method = meth;
84 }
85
DSA_get_default_method(void)86 const DSA_METHOD *DSA_get_default_method(void)
87 {
88 if (!default_DSA_method) {
89 #ifdef OPENSSL_FIPS
90 if (FIPS_mode())
91 return FIPS_dsa_openssl();
92 else
93 return DSA_OpenSSL();
94 #else
95 default_DSA_method = DSA_OpenSSL();
96 #endif
97 }
98 return default_DSA_method;
99 }
100
DSA_new(void)101 DSA *DSA_new(void)
102 {
103 return DSA_new_method(NULL);
104 }
105
DSA_set_method(DSA * dsa,const DSA_METHOD * meth)106 int DSA_set_method(DSA *dsa, const DSA_METHOD *meth)
107 {
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 */
112 const DSA_METHOD *mtmp;
113 mtmp = dsa->meth;
114 if (mtmp->finish)
115 mtmp->finish(dsa);
116 #ifndef OPENSSL_NO_ENGINE
117 if (dsa->engine) {
118 ENGINE_finish(dsa->engine);
119 dsa->engine = NULL;
120 }
121 #endif
122 dsa->meth = meth;
123 if (meth->init)
124 meth->init(dsa);
125 return 1;
126 }
127
DSA_new_method(ENGINE * engine)128 DSA *DSA_new_method(ENGINE *engine)
129 {
130 DSA *ret;
131
132 ret = (DSA *)OPENSSL_malloc(sizeof(DSA));
133 if (ret == NULL) {
134 DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
135 return (NULL);
136 }
137 ret->meth = DSA_get_default_method();
138 #ifndef OPENSSL_NO_ENGINE
139 if (engine) {
140 if (!ENGINE_init(engine)) {
141 DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
142 OPENSSL_free(ret);
143 return NULL;
144 }
145 ret->engine = engine;
146 } else
147 ret->engine = ENGINE_get_default_DSA();
148 if (ret->engine) {
149 ret->meth = ENGINE_get_DSA(ret->engine);
150 if (!ret->meth) {
151 DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
152 ENGINE_finish(ret->engine);
153 OPENSSL_free(ret);
154 return NULL;
155 }
156 }
157 #endif
158
159 ret->pad = 0;
160 ret->version = 0;
161 ret->write_params = 1;
162 ret->p = NULL;
163 ret->q = NULL;
164 ret->g = NULL;
165
166 ret->pub_key = NULL;
167 ret->priv_key = NULL;
168
169 ret->kinv = NULL;
170 ret->r = NULL;
171 ret->method_mont_p = NULL;
172
173 ret->references = 1;
174 ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW;
175 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
176 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
177 #ifndef OPENSSL_NO_ENGINE
178 if (ret->engine)
179 ENGINE_finish(ret->engine);
180 #endif
181 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
182 OPENSSL_free(ret);
183 ret = NULL;
184 }
185
186 return (ret);
187 }
188
DSA_free(DSA * r)189 void DSA_free(DSA *r)
190 {
191 int i;
192
193 if (r == NULL)
194 return;
195
196 i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DSA);
197 #ifdef REF_PRINT
198 REF_PRINT("DSA", r);
199 #endif
200 if (i > 0)
201 return;
202 #ifdef REF_CHECK
203 if (i < 0) {
204 fprintf(stderr, "DSA_free, bad reference count\n");
205 abort();
206 }
207 #endif
208
209 if (r->meth->finish)
210 r->meth->finish(r);
211 #ifndef OPENSSL_NO_ENGINE
212 if (r->engine)
213 ENGINE_finish(r->engine);
214 #endif
215
216 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);
217
218 if (r->p != NULL)
219 BN_clear_free(r->p);
220 if (r->q != NULL)
221 BN_clear_free(r->q);
222 if (r->g != NULL)
223 BN_clear_free(r->g);
224 if (r->pub_key != NULL)
225 BN_clear_free(r->pub_key);
226 if (r->priv_key != NULL)
227 BN_clear_free(r->priv_key);
228 if (r->kinv != NULL)
229 BN_clear_free(r->kinv);
230 if (r->r != NULL)
231 BN_clear_free(r->r);
232 OPENSSL_free(r);
233 }
234
DSA_up_ref(DSA * r)235 int DSA_up_ref(DSA *r)
236 {
237 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA);
238 #ifdef REF_PRINT
239 REF_PRINT("DSA", r);
240 #endif
241 #ifdef REF_CHECK
242 if (i < 2) {
243 fprintf(stderr, "DSA_up_ref, bad reference count\n");
244 abort();
245 }
246 #endif
247 return ((i > 1) ? 1 : 0);
248 }
249
DSA_size(const DSA * r)250 int DSA_size(const DSA *r)
251 {
252 int ret, i;
253 ASN1_INTEGER bs;
254 unsigned char buf[4]; /* 4 bytes looks really small. However,
255 * i2d_ASN1_INTEGER() will not look beyond
256 * the first byte, as long as the second
257 * parameter is NULL. */
258
259 i = BN_num_bits(r->q);
260 bs.length = (i + 7) / 8;
261 bs.data = buf;
262 bs.type = V_ASN1_INTEGER;
263 /* If the top bit is set the asn1 encoding is 1 larger. */
264 buf[0] = 0xff;
265
266 i = i2d_ASN1_INTEGER(&bs, NULL);
267 i += i; /* r and s */
268 ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE);
269 return (ret);
270 }
271
DSA_get_ex_new_index(long argl,void * argp,CRYPTO_EX_new * new_func,CRYPTO_EX_dup * dup_func,CRYPTO_EX_free * free_func)272 int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
273 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
274 {
275 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp,
276 new_func, dup_func, free_func);
277 }
278
DSA_set_ex_data(DSA * d,int idx,void * arg)279 int DSA_set_ex_data(DSA *d, int idx, void *arg)
280 {
281 return (CRYPTO_set_ex_data(&d->ex_data, idx, arg));
282 }
283
DSA_get_ex_data(DSA * d,int idx)284 void *DSA_get_ex_data(DSA *d, int idx)
285 {
286 return (CRYPTO_get_ex_data(&d->ex_data, idx));
287 }
288
289 #ifndef OPENSSL_NO_DH
DSA_dup_DH(const DSA * r)290 DH *DSA_dup_DH(const DSA *r)
291 {
292 /*
293 * DSA has p, q, g, optional pub_key, optional priv_key. DH has p,
294 * optional length, g, optional pub_key, optional priv_key, optional q.
295 */
296
297 DH *ret = NULL;
298
299 if (r == NULL)
300 goto err;
301 ret = DH_new();
302 if (ret == NULL)
303 goto err;
304 if (r->p != NULL)
305 if ((ret->p = BN_dup(r->p)) == NULL)
306 goto err;
307 if (r->q != NULL) {
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
330