dh_lib.c revision 76866 
1/* crypto/dh/dh_lib.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
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.
8 *
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).
15 *
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.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
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)"
40 *
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
51 * SUCH DAMAGE.
52 *
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.]
57 */
58
59#include <stdio.h>
60#include "cryptlib.h"
61#include <openssl/bn.h>
62#include <openssl/dh.h>
63
64const char *DH_version="Diffie-Hellman" OPENSSL_VERSION_PTEXT;
65
66static DH_METHOD *default_DH_method;
67static int dh_meth_num = 0;
68static STACK_OF(CRYPTO_EX_DATA_FUNCS) *dh_meth = NULL;
69
70void DH_set_default_method(DH_METHOD *meth)
71{
72	default_DH_method = meth;
73}
74
75DH_METHOD *DH_get_default_method(void)
76{
77	if(!default_DH_method) default_DH_method = DH_OpenSSL();
78	return default_DH_method;
79}
80
81DH_METHOD *DH_set_method(DH *dh, DH_METHOD *meth)
82{
83        DH_METHOD *mtmp;
84        mtmp = dh->meth;
85        if (mtmp->finish) mtmp->finish(dh);
86        dh->meth = meth;
87        if (meth->init) meth->init(dh);
88        return mtmp;
89}
90
91DH *DH_new(void)
92{
93	return DH_new_method(NULL);
94}
95
96DH *DH_new_method(DH_METHOD *meth)
97	{
98	DH *ret;
99	ret=(DH *)OPENSSL_malloc(sizeof(DH));
100
101	if (ret == NULL)
102		{
103		DHerr(DH_F_DH_NEW,ERR_R_MALLOC_FAILURE);
104		return(NULL);
105		}
106	if(meth) ret->meth = meth;
107	else ret->meth = DH_get_default_method();
108	ret->pad=0;
109	ret->version=0;
110	ret->p=NULL;
111	ret->g=NULL;
112	ret->length=0;
113	ret->pub_key=NULL;
114	ret->priv_key=NULL;
115	ret->q=NULL;
116	ret->j=NULL;
117	ret->seed = NULL;
118	ret->seedlen = 0;
119	ret->counter = NULL;
120	ret->method_mont_p=NULL;
121	ret->references = 1;
122	ret->flags=ret->meth->flags;
123	CRYPTO_new_ex_data(dh_meth,ret,&ret->ex_data);
124	if ((ret->meth->init != NULL) && !ret->meth->init(ret))
125		{
126		CRYPTO_free_ex_data(dh_meth,ret,&ret->ex_data);
127		OPENSSL_free(ret);
128		ret=NULL;
129		}
130	return(ret);
131	}
132
133void DH_free(DH *r)
134	{
135	int i;
136	if(r == NULL) return;
137	i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH);
138#ifdef REF_PRINT
139	REF_PRINT("DH",r);
140#endif
141	if (i > 0) return;
142#ifdef REF_CHECK
143	if (i < 0)
144		{
145		fprintf(stderr,"DH_free, bad reference count\n");
146		abort();
147	}
148#endif
149
150	if(r->meth->finish) r->meth->finish(r);
151
152	CRYPTO_free_ex_data(dh_meth, r, &r->ex_data);
153
154	if (r->p != NULL) BN_clear_free(r->p);
155	if (r->g != NULL) BN_clear_free(r->g);
156	if (r->q != NULL) BN_clear_free(r->q);
157	if (r->j != NULL) BN_clear_free(r->j);
158	if (r->seed) OPENSSL_free(r->seed);
159	if (r->counter != NULL) BN_clear_free(r->counter);
160	if (r->pub_key != NULL) BN_clear_free(r->pub_key);
161	if (r->priv_key != NULL) BN_clear_free(r->priv_key);
162	OPENSSL_free(r);
163	}
164
165int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
166	     CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
167        {
168	dh_meth_num++;
169	return(CRYPTO_get_ex_new_index(dh_meth_num-1,
170		&dh_meth,argl,argp,new_func,dup_func,free_func));
171        }
172
173int DH_set_ex_data(DH *d, int idx, void *arg)
174	{
175	return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
176	}
177
178void *DH_get_ex_data(DH *d, int idx)
179	{
180	return(CRYPTO_get_ex_data(&d->ex_data,idx));
181	}
182
183int DH_size(DH *dh)
184	{
185	return(BN_num_bytes(dh->p));
186	}
187