1 /* crypto/dh/dh_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.]
60 #include "internal/cryptlib.h"
61 #include <openssl/bn.h>
62 #include <openssl/dh.h>
63 #ifndef OPENSSL_NO_ENGINE
64 # include <openssl/engine.h>
67 static const DH_METHOD *default_DH_method = NULL;
69 void DH_set_default_method(const DH_METHOD *meth)
71 default_DH_method = meth;
74 const DH_METHOD *DH_get_default_method(void)
76 if (!default_DH_method)
77 default_DH_method = DH_OpenSSL();
78 return default_DH_method;
81 int DH_set_method(DH *dh, const DH_METHOD *meth)
84 * NB: The caller is specifically setting a method, so it's not up to us
85 * to deal with which ENGINE it comes from.
87 const DH_METHOD *mtmp;
91 #ifndef OPENSSL_NO_ENGINE
93 ENGINE_finish(dh->engine);
105 return DH_new_method(NULL);
108 DH *DH_new_method(ENGINE *engine)
110 DH *ret = OPENSSL_malloc(sizeof(*ret));
113 DHerr(DH_F_DH_NEW_METHOD, ERR_R_MALLOC_FAILURE);
117 ret->meth = DH_get_default_method();
118 #ifndef OPENSSL_NO_ENGINE
120 if (!ENGINE_init(engine)) {
121 DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB);
125 ret->engine = engine;
127 ret->engine = ENGINE_get_default_DH();
129 ret->meth = ENGINE_get_DH(ret->engine);
131 DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB);
132 ENGINE_finish(ret->engine);
145 ret->priv_key = NULL;
151 ret->method_mont_p = NULL;
153 ret->flags = ret->meth->flags;
154 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data);
155 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
156 #ifndef OPENSSL_NO_ENGINE
158 ENGINE_finish(ret->engine);
160 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data);
173 i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH);
181 fprintf(stderr, "DH_free, bad reference count\n");
188 #ifndef OPENSSL_NO_ENGINE
190 ENGINE_finish(r->engine);
193 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data);
199 OPENSSL_free(r->seed);
200 BN_clear_free(r->counter);
201 BN_clear_free(r->pub_key);
202 BN_clear_free(r->priv_key);
208 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DH);
214 fprintf(stderr, "DH_up, bad reference count\n");
218 return ((i > 1) ? 1 : 0);
221 int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
222 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
224 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DH, argl, argp,
225 new_func, dup_func, free_func);
228 int DH_set_ex_data(DH *d, int idx, void *arg)
230 return (CRYPTO_set_ex_data(&d->ex_data, idx, arg));
233 void *DH_get_ex_data(DH *d, int idx)
235 return (CRYPTO_get_ex_data(&d->ex_data, idx));
238 int DH_bits(const DH *dh)
240 return BN_num_bits(dh->p);
243 int DH_size(const DH *dh)
245 return (BN_num_bytes(dh->p));
248 int DH_security_bits(const DH *dh)
252 N = BN_num_bits(dh->q);
257 return BN_security_bits(BN_num_bits(dh->p), N);