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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 *)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(!default_DH_method) default_DH_method = DH_OpenSSL();
107 if(meth) ret->meth = meth;
108 else ret->meth = default_DH_method;
109 ret->pad=0;
110 ret->version=0;
111 ret->p=NULL;
112 ret->g=NULL;
113 ret->length=0;
114 ret->pub_key=NULL;
115 ret->priv_key=NULL;
116 ret->q=NULL;
117 ret->j=NULL;
118 ret->seed = NULL;
119 ret->seedlen = 0;
120 ret->counter = NULL;
121 ret->method_mont_p=NULL;
122 ret->references = 1;
123 ret->flags=ret->meth->flags;
124 if ((ret->meth->init != NULL) && !ret->meth->init(ret))
125 {
126 Free(ret);
127 ret=NULL;
128 }
129 else
130 CRYPTO_new_ex_data(dh_meth,ret,&ret->ex_data);
131 return(ret);
132 }
133
134void DH_free(DH *r)
135 {
136 int i;
137 if(r == NULL) return;
138 i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH);
139#ifdef REF_PRINT
140 REF_PRINT("DH",r);
141#endif
142 if (i > 0) return;
143#ifdef REF_CHECK
144 if (i < 0)
145 {
146 fprintf(stderr,"DH_free, bad reference count\n");
147 abort();
148 }
149#endif
150
151 CRYPTO_free_ex_data(dh_meth, r, &r->ex_data);
152
153 if(r->meth->finish) r->meth->finish(r);
154
155 if (r->p != NULL) BN_clear_free(r->p);
156 if (r->g != NULL) BN_clear_free(r->g);
157 if (r->q != NULL) BN_clear_free(r->q);
158 if (r->j != NULL) BN_clear_free(r->j);
159 if (r->seed) Free(r->seed);
160 if (r->counter != NULL) BN_clear_free(r->counter);
161 if (r->pub_key != NULL) BN_clear_free(r->pub_key);
162 if (r->priv_key != NULL) BN_clear_free(r->priv_key);
163 Free(r);
164 }
165
166int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
167 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
168 {
169 dh_meth_num++;
170 return(CRYPTO_get_ex_new_index(dh_meth_num-1,
171 &dh_meth,argl,argp,new_func,dup_func,free_func));
172 }
173
174int DH_set_ex_data(DH *d, int idx, void *arg)
175 {
176 return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
177 }
178
179void *DH_get_ex_data(DH *d, int idx)
180 {
181 return(CRYPTO_get_ex_data(&d->ex_data,idx));
182 }
183
184int DH_size(DH *dh)
185 {
186 return(BN_num_bytes(dh->p));
187 }
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