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-rw-r--r--src/lib/libcrypto/dh/dh_key.c211
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diff --git a/src/lib/libcrypto/dh/dh_key.c b/src/lib/libcrypto/dh/dh_key.c
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1/* crypto/dh/dh_key.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/rand.h>
63#include <openssl/dh.h>
64
65static int generate_key(DH *dh);
66static int compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh);
67static int dh_bn_mod_exp(DH *dh, BIGNUM *r, BIGNUM *a, const BIGNUM *p,
68 const BIGNUM *m, BN_CTX *ctx,
69 BN_MONT_CTX *m_ctx);
70static int dh_init(DH *dh);
71static int dh_finish(DH *dh);
72
73int DH_generate_key(DH *dh)
74 {
75 return dh->meth->generate_key(dh);
76 }
77
78int DH_compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh)
79 {
80 return dh->meth->compute_key(key, pub_key, dh);
81 }
82
83static DH_METHOD dh_ossl = {
84"OpenSSL DH Method",
85generate_key,
86compute_key,
87dh_bn_mod_exp,
88dh_init,
89dh_finish,
900,
91NULL
92};
93
94DH_METHOD *DH_OpenSSL(void)
95{
96 return &dh_ossl;
97}
98
99static int generate_key(DH *dh)
100 {
101 int ok=0;
102 unsigned int i;
103 BN_CTX ctx;
104 BN_MONT_CTX *mont;
105 BIGNUM *pub_key=NULL,*priv_key=NULL;
106
107 BN_CTX_init(&ctx);
108
109 if (dh->priv_key == NULL)
110 {
111 i=dh->length;
112 if (i == 0)
113 {
114 /* Make the number p-1 bits long */
115 i=BN_num_bits(dh->p)-1;
116 }
117 priv_key=BN_new();
118 if (priv_key == NULL) goto err;
119 if (!BN_rand(priv_key,i,0,0)) goto err;
120 }
121 else
122 priv_key=dh->priv_key;
123
124 if (dh->pub_key == NULL)
125 {
126 pub_key=BN_new();
127 if (pub_key == NULL) goto err;
128 }
129 else
130 pub_key=dh->pub_key;
131
132 if ((dh->method_mont_p == NULL) && (dh->flags & DH_FLAG_CACHE_MONT_P))
133 {
134 if ((dh->method_mont_p=(char *)BN_MONT_CTX_new()) != NULL)
135 if (!BN_MONT_CTX_set((BN_MONT_CTX *)dh->method_mont_p,
136 dh->p,&ctx)) goto err;
137 }
138 mont=(BN_MONT_CTX *)dh->method_mont_p;
139
140 if (!dh->meth->bn_mod_exp(dh, pub_key,dh->g,priv_key,dh->p,&ctx,mont))
141 goto err;
142
143 dh->pub_key=pub_key;
144 dh->priv_key=priv_key;
145 ok=1;
146err:
147 if (ok != 1)
148 DHerr(DH_F_DH_GENERATE_KEY,ERR_R_BN_LIB);
149
150 if ((pub_key != NULL) && (dh->pub_key == NULL)) BN_free(pub_key);
151 if ((priv_key != NULL) && (dh->priv_key == NULL)) BN_free(priv_key);
152 BN_CTX_free(&ctx);
153 return(ok);
154 }
155
156static int compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh)
157 {
158 BN_CTX ctx;
159 BN_MONT_CTX *mont;
160 BIGNUM *tmp;
161 int ret= -1;
162
163 BN_CTX_init(&ctx);
164 BN_CTX_start(&ctx);
165 tmp = BN_CTX_get(&ctx);
166
167 if (dh->priv_key == NULL)
168 {
169 DHerr(DH_F_DH_COMPUTE_KEY,DH_R_NO_PRIVATE_VALUE);
170 goto err;
171 }
172 if ((dh->method_mont_p == NULL) && (dh->flags & DH_FLAG_CACHE_MONT_P))
173 {
174 if ((dh->method_mont_p=(char *)BN_MONT_CTX_new()) != NULL)
175 if (!BN_MONT_CTX_set((BN_MONT_CTX *)dh->method_mont_p,
176 dh->p,&ctx)) goto err;
177 }
178
179 mont=(BN_MONT_CTX *)dh->method_mont_p;
180 if (!dh->meth->bn_mod_exp(dh, tmp,pub_key,dh->priv_key,dh->p,&ctx,mont))
181 {
182 DHerr(DH_F_DH_COMPUTE_KEY,ERR_R_BN_LIB);
183 goto err;
184 }
185
186 ret=BN_bn2bin(tmp,key);
187err:
188 BN_CTX_end(&ctx);
189 BN_CTX_free(&ctx);
190 return(ret);
191 }
192
193static int dh_bn_mod_exp(DH *dh, BIGNUM *r, BIGNUM *a, const BIGNUM *p,
194 const BIGNUM *m, BN_CTX *ctx,
195 BN_MONT_CTX *m_ctx)
196{
197 return BN_mod_exp_mont(r, a, p, m, ctx, m_ctx);
198}
199
200static int dh_init(DH *dh)
201{
202 dh->flags |= DH_FLAG_CACHE_MONT_P;
203 return(1);
204}
205
206static int dh_finish(DH *dh)
207{
208 if(dh->method_mont_p)
209 BN_MONT_CTX_free((BN_MONT_CTX *)dh->method_mont_p);
210 return(1);
211}
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