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-rw-r--r--src/lib/libcrypto/dh/dh_key.c267
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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
65#ifndef OPENSSL_FIPS
66
67static int generate_key(DH *dh);
68static int compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh);
69static int dh_bn_mod_exp(const DH *dh, BIGNUM *r,
70 const BIGNUM *a, const BIGNUM *p,
71 const BIGNUM *m, BN_CTX *ctx,
72 BN_MONT_CTX *m_ctx);
73static int dh_init(DH *dh);
74static int dh_finish(DH *dh);
75
76int DH_generate_key(DH *dh)
77 {
78 return dh->meth->generate_key(dh);
79 }
80
81int DH_compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh)
82 {
83 return dh->meth->compute_key(key, pub_key, dh);
84 }
85
86static DH_METHOD dh_ossl = {
87"OpenSSL DH Method",
88generate_key,
89compute_key,
90dh_bn_mod_exp,
91dh_init,
92dh_finish,
930,
94NULL,
95NULL
96};
97
98const DH_METHOD *DH_OpenSSL(void)
99{
100 return &dh_ossl;
101}
102
103static int generate_key(DH *dh)
104 {
105 int ok=0;
106 int generate_new_key=0;
107 unsigned l;
108 BN_CTX *ctx;
109 BN_MONT_CTX *mont=NULL;
110 BIGNUM *pub_key=NULL,*priv_key=NULL;
111
112 ctx = BN_CTX_new();
113 if (ctx == NULL) goto err;
114
115 if (dh->priv_key == NULL)
116 {
117 priv_key=BN_new();
118 if (priv_key == NULL) goto err;
119 generate_new_key=1;
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
133 if (dh->flags & DH_FLAG_CACHE_MONT_P)
134 {
135 mont = BN_MONT_CTX_set_locked(&dh->method_mont_p,
136 CRYPTO_LOCK_DH, dh->p, ctx);
137 if (!mont)
138 goto err;
139 }
140
141 if (generate_new_key)
142 {
143 l = dh->length ? dh->length : BN_num_bits(dh->p)-1; /* secret exponent length */
144 if (!BN_rand(priv_key, l, 0, 0)) goto err;
145 }
146
147 {
148 BIGNUM local_prk;
149 BIGNUM *prk;
150
151 if ((dh->flags & DH_FLAG_NO_EXP_CONSTTIME) == 0)
152 {
153 BN_init(&local_prk);
154 prk = &local_prk;
155 BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME);
156 }
157 else
158 prk = priv_key;
159
160 if (!dh->meth->bn_mod_exp(dh, pub_key, dh->g, prk, dh->p, ctx, mont)) goto err;
161 }
162
163 dh->pub_key=pub_key;
164 dh->priv_key=priv_key;
165 ok=1;
166err:
167 if (ok != 1)
168 DHerr(DH_F_GENERATE_KEY,ERR_R_BN_LIB);
169
170 if ((pub_key != NULL) && (dh->pub_key == NULL)) BN_free(pub_key);
171 if ((priv_key != NULL) && (dh->priv_key == NULL)) BN_free(priv_key);
172 BN_CTX_free(ctx);
173 return(ok);
174 }
175
176static int compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh)
177 {
178 BN_CTX *ctx=NULL;
179 BN_MONT_CTX *mont=NULL;
180 BIGNUM *tmp;
181 int ret= -1;
182 int check_result;
183
184 if (BN_num_bits(dh->p) > OPENSSL_DH_MAX_MODULUS_BITS)
185 {
186 DHerr(DH_F_COMPUTE_KEY,DH_R_MODULUS_TOO_LARGE);
187 goto err;
188 }
189
190 ctx = BN_CTX_new();
191 if (ctx == NULL) goto err;
192 BN_CTX_start(ctx);
193 tmp = BN_CTX_get(ctx);
194
195 if (dh->priv_key == NULL)
196 {
197 DHerr(DH_F_COMPUTE_KEY,DH_R_NO_PRIVATE_VALUE);
198 goto err;
199 }
200
201 if (dh->flags & DH_FLAG_CACHE_MONT_P)
202 {
203 mont = BN_MONT_CTX_set_locked(&dh->method_mont_p,
204 CRYPTO_LOCK_DH, dh->p, ctx);
205 if ((dh->flags & DH_FLAG_NO_EXP_CONSTTIME) == 0)
206 {
207 /* XXX */
208 BN_set_flags(dh->priv_key, BN_FLG_CONSTTIME);
209 }
210 if (!mont)
211 goto err;
212 }
213
214 if (!DH_check_pub_key(dh, pub_key, &check_result) || check_result)
215 {
216 DHerr(DH_F_COMPUTE_KEY,DH_R_INVALID_PUBKEY);
217 goto err;
218 }
219
220 if (!dh->meth->bn_mod_exp(dh, tmp, pub_key, dh->priv_key,dh->p,ctx,mont))
221 {
222 DHerr(DH_F_COMPUTE_KEY,ERR_R_BN_LIB);
223 goto err;
224 }
225
226 ret=BN_bn2bin(tmp,key);
227err:
228 if (ctx != NULL)
229 {
230 BN_CTX_end(ctx);
231 BN_CTX_free(ctx);
232 }
233 return(ret);
234 }
235
236static int dh_bn_mod_exp(const DH *dh, BIGNUM *r,
237 const BIGNUM *a, const BIGNUM *p,
238 const BIGNUM *m, BN_CTX *ctx,
239 BN_MONT_CTX *m_ctx)
240 {
241 /* If a is only one word long and constant time is false, use the faster
242 * exponenentiation function.
243 */
244 if (a->top == 1 && ((dh->flags & DH_FLAG_NO_EXP_CONSTTIME) != 0))
245 {
246 BN_ULONG A = a->d[0];
247 return BN_mod_exp_mont_word(r,A,p,m,ctx,m_ctx);
248 }
249 else
250 return BN_mod_exp_mont(r,a,p,m,ctx,m_ctx);
251 }
252
253
254static int dh_init(DH *dh)
255 {
256 dh->flags |= DH_FLAG_CACHE_MONT_P;
257 return(1);
258 }
259
260static int dh_finish(DH *dh)
261 {
262 if(dh->method_mont_p)
263 BN_MONT_CTX_free(dh->method_mont_p);
264 return(1);
265 }
266
267#endif
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