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>
73 const char DSA_version[]="DSA" OPENSSL_VERSION_PTEXT;
75 static const DSA_METHOD *default_DSA_method = NULL;
77 void DSA_set_default_method(const DSA_METHOD *meth)
80 if (FIPS_mode() && !(meth->flags & DSA_FLAG_FIPS_METHOD))
82 DSAerr(DSA_F_DSA_SET_DEFAULT_METHOD, DSA_R_NON_FIPS_METHOD);
87 default_DSA_method = meth;
90 const DSA_METHOD *DSA_get_default_method(void)
92 if(!default_DSA_method)
93 default_DSA_method = DSA_OpenSSL();
94 return default_DSA_method;
99 return DSA_new_method(NULL);
102 int DSA_set_method(DSA *dsa, const DSA_METHOD *meth)
104 /* NB: The caller is specifically setting a method, so it's not up to us
105 * to deal with which ENGINE it comes from. */
106 const DSA_METHOD *mtmp;
108 if (FIPS_mode() && !(meth->flags & DSA_FLAG_FIPS_METHOD))
110 DSAerr(DSA_F_DSA_SET_METHOD, DSA_R_NON_FIPS_METHOD);
115 if (mtmp->finish) mtmp->finish(dsa);
116 #ifndef OPENSSL_NO_ENGINE
119 ENGINE_finish(dsa->engine);
124 if (meth->init) meth->init(dsa);
128 DSA *DSA_new_method(ENGINE *engine)
132 ret=(DSA *)OPENSSL_malloc(sizeof(DSA));
135 DSAerr(DSA_F_DSA_NEW_METHOD,ERR_R_MALLOC_FAILURE);
138 ret->meth = DSA_get_default_method();
139 #ifndef OPENSSL_NO_ENGINE
142 if (!ENGINE_init(engine))
144 DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
148 ret->engine = engine;
151 ret->engine = ENGINE_get_default_DSA();
154 ret->meth = ENGINE_get_DSA(ret->engine);
157 DSAerr(DSA_F_DSA_NEW_METHOD,
159 ENGINE_finish(ret->engine);
166 if (FIPS_mode() && !(ret->meth->flags & DSA_FLAG_FIPS_METHOD))
168 DSAerr(DSA_F_DSA_NEW_METHOD, DSA_R_NON_FIPS_METHOD);
169 #ifndef OPENSSL_NO_ENGINE
171 ENGINE_finish(ret->engine);
190 ret->method_mont_p=NULL;
193 ret->flags=ret->meth->flags;
194 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
195 if ((ret->meth->init != NULL) && !ret->meth->init(ret))
197 #ifndef OPENSSL_NO_ENGINE
199 ENGINE_finish(ret->engine);
201 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
209 void DSA_free(DSA *r)
213 if (r == NULL) return;
215 i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA);
223 fprintf(stderr,"DSA_free, bad reference count\n");
230 #ifndef OPENSSL_NO_ENGINE
232 ENGINE_finish(r->engine);
235 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);
237 if (r->p != NULL) BN_clear_free(r->p);
238 if (r->q != NULL) BN_clear_free(r->q);
239 if (r->g != NULL) BN_clear_free(r->g);
240 if (r->pub_key != NULL) BN_clear_free(r->pub_key);
241 if (r->priv_key != NULL) BN_clear_free(r->priv_key);
242 if (r->kinv != NULL) BN_clear_free(r->kinv);
243 if (r->r != NULL) BN_clear_free(r->r);
247 int DSA_up_ref(DSA *r)
249 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA);
256 fprintf(stderr, "DSA_up_ref, bad reference count\n");
260 return ((i > 1) ? 1 : 0);
263 int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
264 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
266 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp,
267 new_func, dup_func, free_func);
270 int DSA_set_ex_data(DSA *d, int idx, void *arg)
272 return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
275 void *DSA_get_ex_data(DSA *d, int idx)
277 return(CRYPTO_get_ex_data(&d->ex_data,idx));
280 #ifndef OPENSSL_NO_DH
281 DH *DSA_dup_DH(const DSA *r)
283 /* DSA has p, q, g, optional pub_key, optional priv_key.
284 * DH has p, optional length, g, optional pub_key, optional priv_key.
295 if ((ret->p = BN_dup(r->p)) == NULL)
298 ret->length = BN_num_bits(r->q);
300 if ((ret->g = BN_dup(r->g)) == NULL)
302 if (r->pub_key != NULL)
303 if ((ret->pub_key = BN_dup(r->pub_key)) == NULL)
305 if (r->priv_key != NULL)
306 if ((ret->priv_key = BN_dup(r->priv_key)) == NULL)