Line data Source code
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 0 : void DSA_set_default_method(const DSA_METHOD *meth)
82 : {
83 0 : default_DSA_method = meth;
84 0 : }
85 :
86 0 : const DSA_METHOD *DSA_get_default_method(void)
87 : {
88 0 : 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 0 : default_DSA_method = DSA_OpenSSL();
96 : #endif
97 : }
98 0 : return default_DSA_method;
99 : }
100 :
101 0 : DSA *DSA_new(void)
102 : {
103 0 : return DSA_new_method(NULL);
104 : }
105 :
106 0 : 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 0 : mtmp = dsa->meth;
114 0 : if (mtmp->finish)
115 0 : mtmp->finish(dsa);
116 : #ifndef OPENSSL_NO_ENGINE
117 0 : if (dsa->engine) {
118 0 : ENGINE_finish(dsa->engine);
119 0 : dsa->engine = NULL;
120 : }
121 : #endif
122 0 : dsa->meth = meth;
123 0 : if (meth->init)
124 0 : meth->init(dsa);
125 0 : return 1;
126 : }
127 :
128 0 : DSA *DSA_new_method(ENGINE *engine)
129 : {
130 : DSA *ret;
131 :
132 0 : ret = (DSA *)OPENSSL_malloc(sizeof(DSA));
133 0 : if (ret == NULL) {
134 0 : DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
135 0 : return (NULL);
136 : }
137 0 : ret->meth = DSA_get_default_method();
138 : #ifndef OPENSSL_NO_ENGINE
139 0 : if (engine) {
140 0 : if (!ENGINE_init(engine)) {
141 0 : DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
142 0 : OPENSSL_free(ret);
143 0 : return NULL;
144 : }
145 0 : ret->engine = engine;
146 : } else
147 0 : ret->engine = ENGINE_get_default_DSA();
148 0 : if (ret->engine) {
149 0 : ret->meth = ENGINE_get_DSA(ret->engine);
150 0 : if (!ret->meth) {
151 0 : DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
152 0 : ENGINE_finish(ret->engine);
153 0 : OPENSSL_free(ret);
154 0 : return NULL;
155 : }
156 : }
157 : #endif
158 :
159 0 : ret->pad = 0;
160 0 : ret->version = 0;
161 0 : ret->write_params = 1;
162 0 : ret->p = NULL;
163 0 : ret->q = NULL;
164 0 : ret->g = NULL;
165 :
166 0 : ret->pub_key = NULL;
167 0 : ret->priv_key = NULL;
168 :
169 0 : ret->kinv = NULL;
170 0 : ret->r = NULL;
171 0 : ret->method_mont_p = NULL;
172 :
173 0 : ret->references = 1;
174 0 : ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW;
175 0 : CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
176 0 : if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
177 : #ifndef OPENSSL_NO_ENGINE
178 0 : if (ret->engine)
179 0 : ENGINE_finish(ret->engine);
180 : #endif
181 0 : CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
182 0 : OPENSSL_free(ret);
183 : ret = NULL;
184 : }
185 :
186 0 : return (ret);
187 : }
188 :
189 0 : void DSA_free(DSA *r)
190 : {
191 : int i;
192 :
193 0 : if (r == NULL)
194 : return;
195 :
196 0 : i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DSA);
197 : #ifdef REF_PRINT
198 : REF_PRINT("DSA", r);
199 : #endif
200 0 : 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 0 : if (r->meth->finish)
210 0 : r->meth->finish(r);
211 : #ifndef OPENSSL_NO_ENGINE
212 0 : if (r->engine)
213 0 : ENGINE_finish(r->engine);
214 : #endif
215 :
216 0 : CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);
217 :
218 0 : if (r->p != NULL)
219 0 : BN_clear_free(r->p);
220 0 : if (r->q != NULL)
221 0 : BN_clear_free(r->q);
222 0 : if (r->g != NULL)
223 0 : BN_clear_free(r->g);
224 0 : if (r->pub_key != NULL)
225 0 : BN_clear_free(r->pub_key);
226 0 : if (r->priv_key != NULL)
227 0 : BN_clear_free(r->priv_key);
228 0 : if (r->kinv != NULL)
229 0 : BN_clear_free(r->kinv);
230 0 : if (r->r != NULL)
231 0 : BN_clear_free(r->r);
232 0 : OPENSSL_free(r);
233 : }
234 :
235 0 : int DSA_up_ref(DSA *r)
236 : {
237 0 : 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 0 : return ((i > 1) ? 1 : 0);
248 : }
249 :
250 0 : 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 0 : i = BN_num_bits(r->q);
260 0 : bs.length = (i + 7) / 8;
261 0 : bs.data = buf;
262 0 : bs.type = V_ASN1_INTEGER;
263 : /* If the top bit is set the asn1 encoding is 1 larger. */
264 0 : buf[0] = 0xff;
265 :
266 0 : i = i2d_ASN1_INTEGER(&bs, NULL);
267 0 : i += i; /* r and s */
268 0 : ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE);
269 0 : return (ret);
270 : }
271 :
272 0 : 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 0 : return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp,
276 : new_func, dup_func, free_func);
277 : }
278 :
279 0 : int DSA_set_ex_data(DSA *d, int idx, void *arg)
280 : {
281 0 : return (CRYPTO_set_ex_data(&d->ex_data, idx, arg));
282 : }
283 :
284 0 : void *DSA_get_ex_data(DSA *d, int idx)
285 : {
286 0 : return (CRYPTO_get_ex_data(&d->ex_data, idx));
287 : }
288 :
289 : #ifndef OPENSSL_NO_DH
290 0 : 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 0 : if (r == NULL)
300 : goto err;
301 0 : ret = DH_new();
302 0 : if (ret == NULL)
303 : goto err;
304 0 : if (r->p != NULL)
305 0 : if ((ret->p = BN_dup(r->p)) == NULL)
306 : goto err;
307 0 : if (r->q != NULL) {
308 0 : ret->length = BN_num_bits(r->q);
309 0 : if ((ret->q = BN_dup(r->q)) == NULL)
310 : goto err;
311 : }
312 0 : if (r->g != NULL)
313 0 : if ((ret->g = BN_dup(r->g)) == NULL)
314 : goto err;
315 0 : if (r->pub_key != NULL)
316 0 : if ((ret->pub_key = BN_dup(r->pub_key)) == NULL)
317 : goto err;
318 0 : if (r->priv_key != NULL)
319 0 : if ((ret->priv_key = BN_dup(r->priv_key)) == NULL)
320 : goto err;
321 :
322 0 : return ret;
323 :
324 : err:
325 0 : if (ret != NULL)
326 0 : DH_free(ret);
327 : return NULL;
328 : }
329 : #endif
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