1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.]
58 /* Original version from Steven Schoch <schoch@sheba.arc.nasa.gov> */
61 #include "internal/cryptlib.h"
62 #include <openssl/bn.h>
64 #include <openssl/asn1.h>
65 #include <openssl/engine.h>
66 #include <openssl/dh.h>
68 static const DSA_METHOD *default_DSA_method = NULL;
70 void DSA_set_default_method(const DSA_METHOD *meth)
72 default_DSA_method = meth;
75 const DSA_METHOD *DSA_get_default_method(void)
77 if (!default_DSA_method)
78 default_DSA_method = DSA_OpenSSL();
79 return default_DSA_method;
84 return DSA_new_method(NULL);
87 int DSA_set_method(DSA *dsa, const DSA_METHOD *meth)
90 * NB: The caller is specifically setting a method, so it's not up to us
91 * to deal with which ENGINE it comes from.
93 const DSA_METHOD *mtmp;
97 #ifndef OPENSSL_NO_ENGINE
98 ENGINE_finish(dsa->engine);
107 const DSA_METHOD *DSA_get_method(DSA *d)
112 DSA *DSA_new_method(ENGINE *engine)
116 ret = OPENSSL_zalloc(sizeof(*ret));
118 DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
121 ret->meth = DSA_get_default_method();
122 #ifndef OPENSSL_NO_ENGINE
124 if (!ENGINE_init(engine)) {
125 DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
129 ret->engine = engine;
131 ret->engine = ENGINE_get_default_DSA();
133 ret->meth = ENGINE_get_DSA(ret->engine);
134 if (ret->meth == NULL) {
135 DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
136 ENGINE_finish(ret->engine);
144 ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW;
146 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
148 ret->lock = CRYPTO_THREAD_lock_new();
149 if (ret->lock == NULL) {
150 #ifndef OPENSSL_NO_ENGINE
151 ENGINE_finish(ret->engine);
153 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
158 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
166 void DSA_free(DSA *r)
173 CRYPTO_atomic_add(&r->references, -1, &i, r->lock);
174 REF_PRINT_COUNT("DSA", r);
177 REF_ASSERT_ISNT(i < 0);
181 #ifndef OPENSSL_NO_ENGINE
182 ENGINE_finish(r->engine);
185 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);
187 CRYPTO_THREAD_lock_free(r->lock);
192 BN_clear_free(r->pub_key);
193 BN_clear_free(r->priv_key);
197 int DSA_up_ref(DSA *r)
201 if (CRYPTO_atomic_add(&r->references, 1, &i, r->lock) <= 0)
204 REF_PRINT_COUNT("DSA", r);
205 REF_ASSERT_ISNT(i < 2);
206 return ((i > 1) ? 1 : 0);
209 int DSA_size(const DSA *r)
213 unsigned char buf[4]; /* 4 bytes looks really small. However,
214 * i2d_ASN1_INTEGER() will not look beyond
215 * the first byte, as long as the second
216 * parameter is NULL. */
218 i = BN_num_bits(r->q);
219 bs.length = (i + 7) / 8;
221 bs.type = V_ASN1_INTEGER;
222 /* If the top bit is set the asn1 encoding is 1 larger. */
225 i = i2d_ASN1_INTEGER(&bs, NULL);
226 i += i; /* r and s */
227 ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE);
231 int DSA_set_ex_data(DSA *d, int idx, void *arg)
233 return (CRYPTO_set_ex_data(&d->ex_data, idx, arg));
236 void *DSA_get_ex_data(DSA *d, int idx)
238 return (CRYPTO_get_ex_data(&d->ex_data, idx));
241 int DSA_security_bits(const DSA *d)
244 return BN_security_bits(BN_num_bits(d->p), BN_num_bits(d->q));
248 #ifndef OPENSSL_NO_DH
249 DH *DSA_dup_DH(const DSA *r)
252 * DSA has p, q, g, optional pub_key, optional priv_key. DH has p,
253 * optional length, g, optional pub_key, optional priv_key, optional q.
257 BIGNUM *p = NULL, *q = NULL, *g = NULL, *pub_key = NULL, *priv_key = NULL;
264 if (r->p != NULL || r->g != NULL || r->q != NULL) {
265 if (r->p == NULL || r->g == NULL || r->q == NULL) {
266 /* Shouldn't happen */
272 if (p == NULL || g == NULL || q == NULL || !DH_set0_pqg(ret, p, q, g))
277 if (r->pub_key != NULL) {
278 pub_key = BN_dup(r->pub_key);
281 if (r->priv_key != NULL) {
282 priv_key = BN_dup(r->priv_key);
283 if (priv_key == NULL)
286 if (!DH_set0_key(ret, pub_key, priv_key))
288 } else if (r->priv_key != NULL) {
289 /* Shouldn't happen */
306 void DSA_get0_pqg(const DSA *d, BIGNUM **p, BIGNUM **q, BIGNUM **g)
316 int DSA_set0_pqg(DSA *d, BIGNUM *p, BIGNUM *q, BIGNUM *g)
318 /* If the fields in d are NULL, the corresponding input
319 * parameters MUST be non-NULL.
321 * It is an error to give the results from get0 on d
322 * as input parameters.
324 if (p == d->p || q == d->q || g == d->g)
343 void DSA_get0_key(const DSA *d, BIGNUM **pub_key, BIGNUM **priv_key)
346 *pub_key = d->pub_key;
347 if (priv_key != NULL)
348 *priv_key = d->priv_key;
351 int DSA_set0_key(DSA *d, BIGNUM *pub_key, BIGNUM *priv_key)
353 /* If the pub_key in d is NULL, the corresponding input
354 * parameters MUST be non-NULL. The priv_key field may
357 * It is an error to give the results from get0 on d
358 * as input parameters.
360 if (d->pub_key == pub_key
361 || (d->priv_key != NULL && priv_key != d->priv_key))
364 if (pub_key != NULL) {
366 d->pub_key = pub_key;
368 if (priv_key != NULL) {
369 BN_free(d->priv_key);
370 d->priv_key = priv_key;
376 void DSA_clear_flags(DSA *d, int flags)
381 int DSA_test_flags(const DSA *d, int flags)
383 return d->flags & flags;
386 void DSA_set_flags(DSA *d, int flags)
391 ENGINE *DSA_get0_engine(DSA *d)