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1/* $OpenBSD: dh.h,v 1.19 2021/03/12 04:08:19 dtucker Exp $ */
2
3/*
4 * Copyright (c) 2000 Niels Provos. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26#ifndef DH_H
27#define DH_H
28
29#ifdef WITH_OPENSSL
30
31struct dhgroup {
32 int size;
33 BIGNUM *g;
34 BIGNUM *p;
35};
36
37DH *choose_dh(int, int, int);
38DH *dh_new_group_asc(const char *, const char *);
39DH *dh_new_group(BIGNUM *, BIGNUM *);
40DH *dh_new_group1(void);
41DH *dh_new_group14(void);
42DH *dh_new_group16(void);
43DH *dh_new_group18(void);
44DH *dh_new_group_fallback(int);
45
46int dh_gen_key(DH *, int);
47int dh_pub_is_valid(const DH *, const BIGNUM *);
48
49u_int dh_estimate(int);
50void dh_set_moduli_file(const char *);
51
52/*
53 * Max value from RFC4419.
54 * Min value from RFC8270.
55 */
56#define DH_GRP_MIN 2048
57#define DH_GRP_MAX 8192
58
59/*
60 * Values for "type" field of moduli(5)
61 * Specifies the internal structure of the prime modulus.
62 */
63#define MODULI_TYPE_UNKNOWN (0)
64#define MODULI_TYPE_UNSTRUCTURED (1)
65#define MODULI_TYPE_SAFE (2)
66#define MODULI_TYPE_SCHNORR (3)
67#define MODULI_TYPE_SOPHIE_GERMAIN (4)
68#define MODULI_TYPE_STRONG (5)
69
70/*
71 * Values for "tests" field of moduli(5)
72 * Specifies the methods used in checking for primality.
73 * Usually, more than one test is used.
74 */
75#define MODULI_TESTS_UNTESTED (0x00)
76#define MODULI_TESTS_COMPOSITE (0x01)
77#define MODULI_TESTS_SIEVE (0x02)
78#define MODULI_TESTS_MILLER_RABIN (0x04)
79#define MODULI_TESTS_JACOBI (0x08)
80#define MODULI_TESTS_ELLIPTIC (0x10)
81
82#endif /* WITH_OPENSSL */
83
84#endif /* DH_H */