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.]
59 #include "internal/cryptlib.h"
60 #include <openssl/bn.h>
61 #include <openssl/dh.h>
62 #include <openssl/engine.h>
64 static const DH_METHOD *default_DH_method = NULL;
66 void DH_set_default_method(const DH_METHOD *meth)
68 default_DH_method = meth;
71 const DH_METHOD *DH_get_default_method(void)
73 if (!default_DH_method)
74 default_DH_method = DH_OpenSSL();
75 return default_DH_method;
78 int DH_set_method(DH *dh, const DH_METHOD *meth)
81 * NB: The caller is specifically setting a method, so it's not up to us
82 * to deal with which ENGINE it comes from.
84 const DH_METHOD *mtmp;
88 #ifndef OPENSSL_NO_ENGINE
89 ENGINE_finish(dh->engine);
100 return DH_new_method(NULL);
103 DH *DH_new_method(ENGINE *engine)
105 DH *ret = OPENSSL_zalloc(sizeof(*ret));
108 DHerr(DH_F_DH_NEW_METHOD, ERR_R_MALLOC_FAILURE);
112 ret->meth = DH_get_default_method();
113 #ifndef OPENSSL_NO_ENGINE
115 if (!ENGINE_init(engine)) {
116 DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB);
120 ret->engine = engine;
122 ret->engine = ENGINE_get_default_DH();
124 ret->meth = ENGINE_get_DH(ret->engine);
125 if (ret->meth == NULL) {
126 DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB);
127 ENGINE_finish(ret->engine);
135 ret->flags = ret->meth->flags;
137 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data);
139 ret->lock = CRYPTO_THREAD_lock_new();
140 if (ret->lock == NULL) {
141 #ifndef OPENSSL_NO_ENGINE
142 ENGINE_finish(ret->engine);
144 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data);
149 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
164 CRYPTO_atomic_add(&r->references, -1, &i, r->lock);
165 REF_PRINT_COUNT("DH", 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_DH, r, &r->ex_data);
178 CRYPTO_THREAD_lock_free(r->lock);
184 OPENSSL_free(r->seed);
185 BN_clear_free(r->counter);
186 BN_clear_free(r->pub_key);
187 BN_clear_free(r->priv_key);
195 if (CRYPTO_atomic_add(&r->references, 1, &i, r->lock) <= 0)
198 REF_PRINT_COUNT("DH", r);
199 REF_ASSERT_ISNT(i < 2);
200 return ((i > 1) ? 1 : 0);
203 int DH_set_ex_data(DH *d, int idx, void *arg)
205 return (CRYPTO_set_ex_data(&d->ex_data, idx, arg));
208 void *DH_get_ex_data(DH *d, int idx)
210 return (CRYPTO_get_ex_data(&d->ex_data, idx));
213 int DH_bits(const DH *dh)
215 return BN_num_bits(dh->p);
218 int DH_size(const DH *dh)
220 return (BN_num_bytes(dh->p));
223 int DH_security_bits(const DH *dh)
227 N = BN_num_bits(dh->q);
232 return BN_security_bits(BN_num_bits(dh->p), N);