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-rw-r--r--src/lib/libcrypto/dh/dh_gen.c197
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diff --git a/src/lib/libcrypto/dh/dh_gen.c b/src/lib/libcrypto/dh/dh_gen.c
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index 3ffa5d80f1..0000000000
--- a/src/lib/libcrypto/dh/dh_gen.c
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1/* $OpenBSD: dh_gen.c,v 1.21 2023/07/08 15:29:03 beck 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
65#include "bn_local.h"
66#include "dh_local.h"
67
68static int dh_builtin_genparams(DH *ret, int prime_len, int generator,
69 BN_GENCB *cb);
70
71int
72DH_generate_parameters_ex(DH *ret, int prime_len, int generator, BN_GENCB *cb)
73{
74 if (ret->meth->generate_params)
75 return ret->meth->generate_params(ret, prime_len, generator, cb);
76 return dh_builtin_genparams(ret, prime_len, generator, cb);
77}
78LCRYPTO_ALIAS(DH_generate_parameters_ex);
79
80/*
81 * We generate DH parameters as follows:
82 * find a prime q which is prime_len/2 bits long.
83 * p=(2*q)+1 or (p-1)/2 = q
84 * For this case, g is a generator if
85 * g^((p-1)/q) mod p != 1 for values of q which are the factors of p-1.
86 * Since the factors of p-1 are q and 2, we just need to check
87 * g^2 mod p != 1 and g^q mod p != 1.
88 *
89 * Having said all that,
90 * there is another special case method for the generators 2, 3 and 5.
91 * for 2, p mod 24 == 11
92 * for 3, p mod 12 == 5 <<<<< does not work for safe primes.
93 * for 5, p mod 10 == 3 or 7
94 *
95 * Thanks to Phil Karn <karn@qualcomm.com> for the pointers about the
96 * special generators and for answering some of my questions.
97 *
98 * I've implemented the second simple method :-).
99 * Since DH should be using a safe prime (both p and q are prime),
100 * this generator function can take a very very long time to run.
101 */
102/* Actually there is no reason to insist that 'generator' be a generator.
103 * It's just as OK (and in some sense better) to use a generator of the
104 * order-q subgroup.
105 */
106static int
107dh_builtin_genparams(DH *ret, int prime_len, int generator, BN_GENCB *cb)
108{
109 BIGNUM *t1, *t2;
110 int g, ok = -1;
111 BN_CTX *ctx = NULL;
112
113 ctx = BN_CTX_new();
114 if (ctx == NULL)
115 goto err;
116 BN_CTX_start(ctx);
117 if ((t1 = BN_CTX_get(ctx)) == NULL)
118 goto err;
119 if ((t2 = BN_CTX_get(ctx)) == NULL)
120 goto err;
121
122 /* Make sure 'ret' has the necessary elements */
123 if (!ret->p && ((ret->p = BN_new()) == NULL))
124 goto err;
125 if (!ret->g && ((ret->g = BN_new()) == NULL))
126 goto err;
127
128 if (generator <= 1) {
129 DHerror(DH_R_BAD_GENERATOR);
130 goto err;
131 }
132 if (generator == DH_GENERATOR_2) {
133 if (!BN_set_word(t1, 24))
134 goto err;
135 if (!BN_set_word(t2, 11))
136 goto err;
137 g = 2;
138 } else if (generator == DH_GENERATOR_5) {
139 if (!BN_set_word(t1, 10))
140 goto err;
141 if (!BN_set_word(t2, 3))
142 goto err;
143 /* BN_set_word(t3,7); just have to miss
144 * out on these ones :-( */
145 g = 5;
146 } else {
147 /*
148 * in the general case, don't worry if 'generator' is a
149 * generator or not: since we are using safe primes,
150 * it will generate either an order-q or an order-2q group,
151 * which both is OK
152 */
153 if (!BN_set_word(t1, 2))
154 goto err;
155 if (!BN_set_word(t2, 1))
156 goto err;
157 g = generator;
158 }
159
160 if (!BN_generate_prime_ex(ret->p, prime_len, 1, t1, t2, cb))
161 goto err;
162 if (!BN_GENCB_call(cb, 3, 0))
163 goto err;
164 if (!BN_set_word(ret->g, g))
165 goto err;
166 ok = 1;
167err:
168 if (ok == -1) {
169 DHerror(ERR_R_BN_LIB);
170 ok = 0;
171 }
172
173 if (ctx != NULL) {
174 BN_CTX_end(ctx);
175 BN_CTX_free(ctx);
176 }
177 return ok;
178}
179
180DH *
181DH_generate_parameters(int prime_len, int generator,
182 void (*callback)(int, int, void *), void *cb_arg)
183{
184 BN_GENCB cb;
185 DH *ret = NULL;
186
187 if ((ret = DH_new()) == NULL)
188 return NULL;
189
190 BN_GENCB_set_old(&cb, callback, cb_arg);
191
192 if (DH_generate_parameters_ex(ret, prime_len, generator, &cb))
193 return ret;
194 DH_free(ret);
195 return NULL;
196}
197LCRYPTO_ALIAS(DH_generate_parameters);
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-05-06 21:58:13 +0000