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-rw-r--r--src/lib/libcrypto/dh/dh_key.c222
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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, const BIGNUM *pub_key, DH *dh);
67static int dh_bn_mod_exp(const DH *dh, BIGNUM *r,
68 const BIGNUM *a, const BIGNUM *p,
69 const BIGNUM *m, BN_CTX *ctx,
70 BN_MONT_CTX *m_ctx);
71static int dh_init(DH *dh);
72static int dh_finish(DH *dh);
73
74int DH_generate_key(DH *dh)
75 {
76 return dh->meth->generate_key(dh);
77 }
78
79int DH_compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh)
80 {
81 return dh->meth->compute_key(key, pub_key, dh);
82 }
83
84static DH_METHOD dh_ossl = {
85"OpenSSL DH Method",
86generate_key,
87compute_key,
88dh_bn_mod_exp,
89dh_init,
90dh_finish,
910,
92NULL
93};
94
95const DH_METHOD *DH_OpenSSL(void)
96{
97 return &dh_ossl;
98}
99
100static int generate_key(DH *dh)
101 {
102 int ok=0;
103 int generate_new_key=0;
104 unsigned l;
105 BN_CTX *ctx;
106 BN_MONT_CTX *mont;
107 BIGNUM *pub_key=NULL,*priv_key=NULL;
108
109 ctx = BN_CTX_new();
110 if (ctx == NULL) goto err;
111
112 if (dh->priv_key == NULL)
113 {
114 priv_key=BN_new();
115 if (priv_key == NULL) goto err;
116 generate_new_key=1;
117 }
118 else
119 priv_key=dh->priv_key;
120
121 if (dh->pub_key == NULL)
122 {
123 pub_key=BN_new();
124 if (pub_key == NULL) goto err;
125 }
126 else
127 pub_key=dh->pub_key;
128
129 if ((dh->method_mont_p == NULL) && (dh->flags & DH_FLAG_CACHE_MONT_P))
130 {
131 if ((dh->method_mont_p=(char *)BN_MONT_CTX_new()) != NULL)
132 if (!BN_MONT_CTX_set((BN_MONT_CTX *)dh->method_mont_p,
133 dh->p,ctx)) goto err;
134 }
135 mont=(BN_MONT_CTX *)dh->method_mont_p;
136
137 if (generate_new_key)
138 {
139 l = dh->length ? dh->length : BN_num_bits(dh->p)-1; /* secret exponent length */
140 if (!BN_rand(priv_key, l, 0, 0)) goto err;
141 }
142 if (!dh->meth->bn_mod_exp(dh, pub_key, dh->g, priv_key,dh->p,ctx,mont))
143 goto err;
144
145 dh->pub_key=pub_key;
146 dh->priv_key=priv_key;
147 ok=1;
148err:
149 if (ok != 1)
150 DHerr(DH_F_DH_GENERATE_KEY,ERR_R_BN_LIB);
151
152 if ((pub_key != NULL) && (dh->pub_key == NULL)) BN_free(pub_key);
153 if ((priv_key != NULL) && (dh->priv_key == NULL)) BN_free(priv_key);
154 BN_CTX_free(ctx);
155 return(ok);
156 }
157
158static int compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh)
159 {
160 BN_CTX *ctx;
161 BN_MONT_CTX *mont;
162 BIGNUM *tmp;
163 int ret= -1;
164
165 ctx = BN_CTX_new();
166 if (ctx == NULL) goto err;
167 BN_CTX_start(ctx);
168 tmp = BN_CTX_get(ctx);
169
170 if (dh->priv_key == NULL)
171 {
172 DHerr(DH_F_DH_COMPUTE_KEY,DH_R_NO_PRIVATE_VALUE);
173 goto err;
174 }
175 if ((dh->method_mont_p == NULL) && (dh->flags & DH_FLAG_CACHE_MONT_P))
176 {
177 if ((dh->method_mont_p=(char *)BN_MONT_CTX_new()) != NULL)
178 if (!BN_MONT_CTX_set((BN_MONT_CTX *)dh->method_mont_p,
179 dh->p,ctx)) goto err;
180 }
181
182 mont=(BN_MONT_CTX *)dh->method_mont_p;
183 if (!dh->meth->bn_mod_exp(dh, tmp, pub_key, dh->priv_key,dh->p,ctx,mont))
184 {
185 DHerr(DH_F_DH_COMPUTE_KEY,ERR_R_BN_LIB);
186 goto err;
187 }
188
189 ret=BN_bn2bin(tmp,key);
190err:
191 BN_CTX_end(ctx);
192 BN_CTX_free(ctx);
193 return(ret);
194 }
195
196static int dh_bn_mod_exp(const DH *dh, BIGNUM *r,
197 const BIGNUM *a, const BIGNUM *p,
198 const BIGNUM *m, BN_CTX *ctx,
199 BN_MONT_CTX *m_ctx)
200 {
201 if (a->top == 1)
202 {
203 BN_ULONG A = a->d[0];
204 return BN_mod_exp_mont_word(r,A,p,m,ctx,m_ctx);
205 }
206 else
207 return BN_mod_exp_mont(r,a,p,m,ctx,m_ctx);
208 }
209
210
211static int dh_init(DH *dh)
212 {
213 dh->flags |= DH_FLAG_CACHE_MONT_P;
214 return(1);
215 }
216
217static int dh_finish(DH *dh)
218 {
219 if(dh->method_mont_p)
220 BN_MONT_CTX_free((BN_MONT_CTX *)dh->method_mont_p);
221 return(1);
222 }
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