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>
63 #include <openssl/dsa.h>
64 #include <openssl/asn1.h>
65 #ifndef OPENSSL_NO_ENGINE
66 # include <openssl/engine.h>
69 # include <openssl/dh.h>
72 static const DSA_METHOD *default_DSA_method = NULL;
74 void DSA_set_default_method(const DSA_METHOD *meth)
76 default_DSA_method = meth;
79 const DSA_METHOD *DSA_get_default_method(void)
81 if (!default_DSA_method)
82 default_DSA_method = DSA_OpenSSL();
83 return default_DSA_method;
88 return DSA_new_method(NULL);
91 int DSA_set_method(DSA *dsa, const DSA_METHOD *meth)
94 * NB: The caller is specifically setting a method, so it's not up to us
95 * to deal with which ENGINE it comes from.
97 const DSA_METHOD *mtmp;
101 #ifndef OPENSSL_NO_ENGINE
102 ENGINE_finish(dsa->engine);
111 DSA *DSA_new_method(ENGINE *engine)
115 ret = OPENSSL_zalloc(sizeof(*ret));
117 DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
120 ret->meth = DSA_get_default_method();
121 #ifndef OPENSSL_NO_ENGINE
123 if (!ENGINE_init(engine)) {
124 DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
128 ret->engine = engine;
130 ret->engine = ENGINE_get_default_DSA();
132 ret->meth = ENGINE_get_DSA(ret->engine);
133 if (ret->meth == NULL) {
134 DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
135 ENGINE_finish(ret->engine);
143 ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW;
144 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
145 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
146 #ifndef OPENSSL_NO_ENGINE
147 ENGINE_finish(ret->engine);
149 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
157 void DSA_free(DSA *r)
164 i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DSA);
165 REF_PRINT_COUNT("DSA", r);
168 REF_ASSERT_ISNT(i < 0);
172 #ifndef OPENSSL_NO_ENGINE
173 ENGINE_finish(r->engine);
176 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);
181 BN_clear_free(r->pub_key);
182 BN_clear_free(r->priv_key);
183 BN_clear_free(r->kinv);
188 int DSA_up_ref(DSA *r)
190 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA);
192 REF_PRINT_COUNT("DSA", r);
193 REF_ASSERT_ISNT(i < 2);
194 return ((i > 1) ? 1 : 0);
197 int DSA_size(const DSA *r)
201 unsigned char buf[4]; /* 4 bytes looks really small. However,
202 * i2d_ASN1_INTEGER() will not look beyond
203 * the first byte, as long as the second
204 * parameter is NULL. */
206 i = BN_num_bits(r->q);
207 bs.length = (i + 7) / 8;
209 bs.type = V_ASN1_INTEGER;
210 /* If the top bit is set the asn1 encoding is 1 larger. */
213 i = i2d_ASN1_INTEGER(&bs, NULL);
214 i += i; /* r and s */
215 ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE);
219 int DSA_set_ex_data(DSA *d, int idx, void *arg)
221 return (CRYPTO_set_ex_data(&d->ex_data, idx, arg));
224 void *DSA_get_ex_data(DSA *d, int idx)
226 return (CRYPTO_get_ex_data(&d->ex_data, idx));
229 int DSA_security_bits(const DSA *d)
232 return BN_security_bits(BN_num_bits(d->p), BN_num_bits(d->q));
236 #ifndef OPENSSL_NO_DH
237 DH *DSA_dup_DH(const DSA *r)
240 * DSA has p, q, g, optional pub_key, optional priv_key. DH has p,
241 * optional length, g, optional pub_key, optional priv_key, optional q.
252 if ((ret->p = BN_dup(r->p)) == NULL)
255 ret->length = BN_num_bits(r->q);
256 if ((ret->q = BN_dup(r->q)) == NULL)
260 if ((ret->g = BN_dup(r->g)) == NULL)
262 if (r->pub_key != NULL)
263 if ((ret->pub_key = BN_dup(r->pub_key)) == NULL)
265 if (r->priv_key != NULL)
266 if ((ret->priv_key = BN_dup(r->priv_key)) == NULL)