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git.ipfire.org Git - thirdparty/openssl.git/blob - crypto/dsa/dsa_lib.c
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
);
186 int DSA_up_ref(DSA
*r
)
188 int i
= CRYPTO_add(&r
->references
, 1, CRYPTO_LOCK_DSA
);
190 REF_PRINT_COUNT("DSA", r
);
191 REF_ASSERT_ISNT(i
< 2);
192 return ((i
> 1) ? 1 : 0);
195 int DSA_size(const DSA
*r
)
199 unsigned char buf
[4]; /* 4 bytes looks really small. However,
200 * i2d_ASN1_INTEGER() will not look beyond
201 * the first byte, as long as the second
202 * parameter is NULL. */
204 i
= BN_num_bits(r
->q
);
205 bs
.length
= (i
+ 7) / 8;
207 bs
.type
= V_ASN1_INTEGER
;
208 /* If the top bit is set the asn1 encoding is 1 larger. */
211 i
= i2d_ASN1_INTEGER(&bs
, NULL
);
212 i
+= i
; /* r and s */
213 ret
= ASN1_object_size(1, i
, V_ASN1_SEQUENCE
);
217 int DSA_set_ex_data(DSA
*d
, int idx
, void *arg
)
219 return (CRYPTO_set_ex_data(&d
->ex_data
, idx
, arg
));
222 void *DSA_get_ex_data(DSA
*d
, int idx
)
224 return (CRYPTO_get_ex_data(&d
->ex_data
, idx
));
227 int DSA_security_bits(const DSA
*d
)
230 return BN_security_bits(BN_num_bits(d
->p
), BN_num_bits(d
->q
));
234 #ifndef OPENSSL_NO_DH
235 DH
*DSA_dup_DH(const DSA
*r
)
238 * DSA has p, q, g, optional pub_key, optional priv_key. DH has p,
239 * optional length, g, optional pub_key, optional priv_key, optional q.
250 if ((ret
->p
= BN_dup(r
->p
)) == NULL
)
253 ret
->length
= BN_num_bits(r
->q
);
254 if ((ret
->q
= BN_dup(r
->q
)) == NULL
)
258 if ((ret
->g
= BN_dup(r
->g
)) == NULL
)
260 if (r
->pub_key
!= NULL
)
261 if ((ret
->pub_key
= BN_dup(r
->pub_key
)) == NULL
)
263 if (r
->priv_key
!= NULL
)
264 if ((ret
->priv_key
= BN_dup(r
->priv_key
)) == NULL
)