1 /* crypto/dsa/dsa_lib.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
59 /* Original version from Steven Schoch <schoch@sheba.arc.nasa.gov> */
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>
70 # include <openssl/dh.h>
74 # include <openssl/fips.h>
77 const char DSA_version[] = "DSA" OPENSSL_VERSION_PTEXT;
79 static const DSA_METHOD *default_DSA_method = NULL;
81 void DSA_set_default_method(const DSA_METHOD *meth)
83 default_DSA_method = meth;
86 const DSA_METHOD *DSA_get_default_method(void)
88 if (!default_DSA_method) {
91 return FIPS_dsa_openssl();
95 default_DSA_method = DSA_OpenSSL();
98 return default_DSA_method;
103 return DSA_new_method(NULL);
106 int DSA_set_method(DSA *dsa, const DSA_METHOD *meth)
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.
112 const DSA_METHOD *mtmp;
116 #ifndef OPENSSL_NO_ENGINE
118 ENGINE_finish(dsa->engine);
128 DSA *DSA_new_method(ENGINE *engine)
132 ret = (DSA *)OPENSSL_malloc(sizeof(DSA));
134 DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
137 ret->meth = DSA_get_default_method();
138 #ifndef OPENSSL_NO_ENGINE
140 if (!ENGINE_init(engine)) {
141 DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
145 ret->engine = engine;
147 ret->engine = ENGINE_get_default_DSA();
149 ret->meth = ENGINE_get_DSA(ret->engine);
151 DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
152 ENGINE_finish(ret->engine);
161 ret->write_params = 1;
167 ret->priv_key = NULL;
171 ret->method_mont_p = NULL;
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
179 ENGINE_finish(ret->engine);
181 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
189 void DSA_free(DSA *r)
196 i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DSA);
204 fprintf(stderr, "DSA_free, bad reference count\n");
211 #ifndef OPENSSL_NO_ENGINE
213 ENGINE_finish(r->engine);
216 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);
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);
229 BN_clear_free(r->kinv);
235 int DSA_up_ref(DSA *r)
237 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA);
243 fprintf(stderr, "DSA_up_ref, bad reference count\n");
247 return ((i > 1) ? 1 : 0);
250 int DSA_size(const DSA *r)
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. */
259 i = BN_num_bits(r->q);
260 bs.length = (i + 7) / 8;
262 bs.type = V_ASN1_INTEGER;
263 /* If the top bit is set the asn1 encoding is 1 larger. */
266 i = i2d_ASN1_INTEGER(&bs, NULL);
267 i += i; /* r and s */
268 ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE);
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)
275 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp,
276 new_func, dup_func, free_func);
279 int DSA_set_ex_data(DSA *d, int idx, void *arg)
281 return (CRYPTO_set_ex_data(&d->ex_data, idx, arg));
284 void *DSA_get_ex_data(DSA *d, int idx)
286 return (CRYPTO_get_ex_data(&d->ex_data, idx));
289 #ifndef OPENSSL_NO_DH
290 DH *DSA_dup_DH(const DSA *r)
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.
305 if ((ret->p = BN_dup(r->p)) == NULL)
308 ret->length = BN_num_bits(r->q);
309 if ((ret->q = BN_dup(r->q)) == NULL)
313 if ((ret->g = BN_dup(r->g)) == NULL)
315 if (r->pub_key != NULL)
316 if ((ret->pub_key = BN_dup(r->pub_key)) == NULL)
318 if (r->priv_key != NULL)
319 if ((ret->priv_key = BN_dup(r->priv_key)) == NULL)