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 #include <openssl/engine.h>
68 const char *DSA_version="DSA" OPENSSL_VERSION_PTEXT;
70 static const DSA_METHOD *default_DSA_method = NULL;
72 void DSA_set_default_openssl_method(const DSA_METHOD *meth)
75 /* We'll need to notify the "openssl" ENGINE of this
76 * change too. We won't bother locking things down at
77 * our end as there was never any locking in these
79 if(default_DSA_method != meth)
81 default_DSA_method = meth;
82 e = ENGINE_by_id("openssl");
85 ENGINE_set_DSA(e, meth);
91 const DSA_METHOD *DSA_get_default_openssl_method(void)
93 if(!default_DSA_method) default_DSA_method = DSA_OpenSSL();
94 return default_DSA_method;
99 return DSA_new_method(NULL);
103 DSA_METHOD *DSA_set_method(DSA *dsa, DSA_METHOD *meth)
107 if (mtmp->finish) mtmp->finish(dsa);
109 if (meth->init) meth->init(dsa);
113 int DSA_set_method(DSA *dsa, ENGINE *engine)
116 const DSA_METHOD *meth;
118 meth = ENGINE_get_DSA(mtmp);
119 if (!ENGINE_init(engine))
121 if (meth->finish) meth->finish(dsa);
122 dsa->engine = engine;
123 meth = ENGINE_get_DSA(engine);
124 if (meth->init) meth->init(dsa);
125 /* SHOULD ERROR CHECK THIS!!! */
133 DSA *DSA_new_method(DSA_METHOD *meth)
135 DSA *DSA_new_method(ENGINE *engine)
138 const DSA_METHOD *meth;
141 ret=(DSA *)OPENSSL_malloc(sizeof(DSA));
144 DSAerr(DSA_F_DSA_NEW,ERR_R_MALLOC_FAILURE);
150 if(ENGINE_init(engine))
151 ret->engine = engine;
156 ret->engine=ENGINE_get_default_DSA();
158 if(ret->engine == NULL)
160 DSAerr(DSA_F_DSA_NEW,ERR_LIB_ENGINE);
165 meth = ENGINE_get_DSA(ret->engine);
178 ret->method_mont_p=NULL;
181 ret->flags=meth->flags;
182 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
183 if ((meth->init != NULL) && !meth->init(ret))
185 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
193 void DSA_free(DSA *r)
195 const DSA_METHOD *meth;
198 if (r == NULL) return;
200 i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA);
208 fprintf(stderr,"DSA_free, bad reference count\n");
213 meth = ENGINE_get_DSA(r->engine);
214 if(meth->finish) meth->finish(r);
215 ENGINE_finish(r->engine);
217 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);
219 if (r->p != NULL) BN_clear_free(r->p);
220 if (r->q != NULL) BN_clear_free(r->q);
221 if (r->g != NULL) BN_clear_free(r->g);
222 if (r->pub_key != NULL) BN_clear_free(r->pub_key);
223 if (r->priv_key != NULL) BN_clear_free(r->priv_key);
224 if (r->kinv != NULL) BN_clear_free(r->kinv);
225 if (r->r != NULL) BN_clear_free(r->r);
229 int DSA_up_ref(DSA *r)
231 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA);
238 fprintf(stderr, "DSA_up_ref, bad reference count\n");
242 return ((i > 1) ? 1 : 0);
245 int DSA_size(const DSA *r)
249 unsigned char buf[4];
254 bs.type=V_ASN1_INTEGER;
255 /* If the top bit is set the asn1 encoding is 1 larger. */
258 i=i2d_ASN1_INTEGER(&bs,NULL);
260 ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE);
264 int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
265 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
267 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp,
268 new_func, dup_func, free_func);
271 int DSA_set_ex_data(DSA *d, int idx, void *arg)
273 return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
276 void *DSA_get_ex_data(DSA *d, int idx)
278 return(CRYPTO_get_ex_data(&d->ex_data,idx));
281 #ifndef OPENSSL_NO_DH
282 DH *DSA_dup_DH(const DSA *r)
284 /* DSA has p, q, g, optional pub_key, optional priv_key.
285 * DH has p, optional length, g, optional pub_key, optional priv_key.
296 if ((ret->p = BN_dup(r->p)) == NULL)
299 ret->length = BN_num_bits(r->q);
301 if ((ret->g = BN_dup(r->g)) == NULL)
303 if (r->pub_key != NULL)
304 if ((ret->pub_key = BN_dup(r->pub_key)) == NULL)
306 if (r->priv_key != NULL)
307 if ((ret->priv_key = BN_dup(r->priv_key)) == NULL)