summaryrefslogtreecommitdiff
path: root/src/lib/libcrypto/dh/dh_key.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/lib/libcrypto/dh/dh_key.c')
-rw-r--r--src/lib/libcrypto/dh/dh_key.c251
1 files changed, 0 insertions, 251 deletions
diff --git a/src/lib/libcrypto/dh/dh_key.c b/src/lib/libcrypto/dh/dh_key.c
deleted file mode 100644
index 6eb1365bf6..0000000000
--- a/src/lib/libcrypto/dh/dh_key.c
+++ /dev/null
@@ -1,251 +0,0 @@
1/* $OpenBSD: dh_key.c,v 1.25 2016/07/07 11:53:12 bcook Exp $ */
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
61#include <openssl/bn.h>
62#include <openssl/dh.h>
63#include <openssl/err.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, const BIGNUM *a,
68 const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
69static int dh_init(DH *dh);
70static int dh_finish(DH *dh);
71
72int
73DH_generate_key(DH *dh)
74{
75 return dh->meth->generate_key(dh);
76}
77
78int
79DH_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 .name = "OpenSSL DH Method",
86 .generate_key = generate_key,
87 .compute_key = compute_key,
88 .bn_mod_exp = dh_bn_mod_exp,
89 .init = dh_init,
90 .finish = dh_finish,
91};
92
93const DH_METHOD *
94DH_OpenSSL(void)
95{
96 return &dh_ossl;
97}
98
99static int
100generate_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 = NULL;
107 BIGNUM *pub_key = NULL, *priv_key = NULL;
108
109 ctx = BN_CTX_new();
110 if (ctx == NULL)
111 goto err;
112
113 if (dh->priv_key == NULL) {
114 priv_key = BN_new();
115 if (priv_key == NULL)
116 goto err;
117 generate_new_key = 1;
118 } else
119 priv_key = dh->priv_key;
120
121 if (dh->pub_key == NULL) {
122 pub_key = BN_new();
123 if (pub_key == NULL)
124 goto err;
125 } else
126 pub_key = dh->pub_key;
127
128 if (dh->flags & DH_FLAG_CACHE_MONT_P) {
129 mont = BN_MONT_CTX_set_locked(&dh->method_mont_p,
130 CRYPTO_LOCK_DH, dh->p, ctx);
131 if (!mont)
132 goto err;
133 }
134
135 if (generate_new_key) {
136 if (dh->q) {
137 do {
138 if (!BN_rand_range(priv_key, dh->q))
139 goto err;
140 } while (BN_is_zero(priv_key) || BN_is_one(priv_key));
141 } else {
142 /* secret exponent length */
143 l = dh->length ? dh->length : BN_num_bits(dh->p) - 1;
144 if (!BN_rand(priv_key, l, 0, 0))
145 goto err;
146 }
147 }
148
149 {
150 BIGNUM prk;
151
152 BN_init(&prk);
153 BN_with_flags(&prk, priv_key, BN_FLG_CONSTTIME);
154
155 if (!dh->meth->bn_mod_exp(dh, pub_key, dh->g, &prk, dh->p, ctx,
156 mont)) {
157 goto err;
158 }
159 }
160
161 dh->pub_key = pub_key;
162 dh->priv_key = priv_key;
163 ok = 1;
164err:
165 if (ok != 1)
166 DHerr(DH_F_GENERATE_KEY, ERR_R_BN_LIB);
167
168 if (pub_key != NULL && dh->pub_key == NULL)
169 BN_free(pub_key);
170 if (priv_key != NULL && dh->priv_key == NULL)
171 BN_free(priv_key);
172 BN_CTX_free(ctx);
173 return ok;
174}
175
176static int
177compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh)
178{
179 BN_CTX *ctx = NULL;
180 BN_MONT_CTX *mont = NULL;
181 BIGNUM *tmp;
182 int ret = -1;
183 int check_result;
184
185 if (BN_num_bits(dh->p) > OPENSSL_DH_MAX_MODULUS_BITS) {
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)
192 goto err;
193 BN_CTX_start(ctx);
194 if ((tmp = BN_CTX_get(ctx)) == NULL)
195 goto err;
196
197 if (dh->priv_key == NULL) {
198 DHerr(DH_F_COMPUTE_KEY, DH_R_NO_PRIVATE_VALUE);
199 goto err;
200 }
201
202 if (dh->flags & DH_FLAG_CACHE_MONT_P) {
203 mont = BN_MONT_CTX_set_locked(&dh->method_mont_p,
204 CRYPTO_LOCK_DH, dh->p, ctx);
205
206 BN_set_flags(dh->priv_key, BN_FLG_CONSTTIME);
207
208 if (!mont)
209 goto err;
210 }
211
212 if (!DH_check_pub_key(dh, pub_key, &check_result) || check_result) {
213 DHerr(DH_F_COMPUTE_KEY, DH_R_INVALID_PUBKEY);
214 goto err;
215 }
216
217 if (!dh->meth->bn_mod_exp(dh, tmp, pub_key, dh->priv_key, dh->p, ctx,
218 mont)) {
219 DHerr(DH_F_COMPUTE_KEY, ERR_R_BN_LIB);
220 goto err;
221 }
222
223 ret = BN_bn2bin(tmp, key);
224err:
225 if (ctx != NULL) {
226 BN_CTX_end(ctx);
227 BN_CTX_free(ctx);
228 }
229 return ret;
230}
231
232static int
233dh_bn_mod_exp(const DH *dh, BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
234 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx)
235{
236 return BN_mod_exp_mont(r, a, p, m, ctx, m_ctx);
237}
238
239static int
240dh_init(DH *dh)
241{
242 dh->flags |= DH_FLAG_CACHE_MONT_P;
243 return 1;
244}
245
246static int
247dh_finish(DH *dh)
248{
249 BN_MONT_CTX_free(dh->method_mont_p);
250 return 1;
251}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-05-07 20:53:57 +0000