dh.h revision 323129 
1/* $OpenBSD: dh.h,v 1.15 2016/05/02 10:26:04 djm 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
29struct dhgroup {
30	int size;
31	BIGNUM *g;
32	BIGNUM *p;
33};
34
35DH	*choose_dh(int, int, int);
36DH	*dh_new_group_asc(const char *, const char *);
37DH	*dh_new_group(BIGNUM *, BIGNUM *);
38DH	*dh_new_group1(void);
39DH	*dh_new_group14(void);
40DH	*dh_new_group16(void);
41DH	*dh_new_group18(void);
42DH	*dh_new_group_fallback(int);
43
44int	 dh_gen_key(DH *, int);
45int	 dh_pub_is_valid(DH *, BIGNUM *);
46
47u_int	 dh_estimate(int);
48
49/*
50 * Max value from RFC4419.
51 * Miniumum increased in light of DH precomputation attacks.
52 */
53#define DH_GRP_MIN	2048
54#define DH_GRP_MAX	8192
55
56/*
57 * Values for "type" field of moduli(5)
58 * Specifies the internal structure of the prime modulus.
59 */
60#define MODULI_TYPE_UNKNOWN		(0)
61#define MODULI_TYPE_UNSTRUCTURED	(1)
62#define MODULI_TYPE_SAFE		(2)
63#define MODULI_TYPE_SCHNORR		(3)
64#define MODULI_TYPE_SOPHIE_GERMAIN	(4)
65#define MODULI_TYPE_STRONG		(5)
66
67/*
68 * Values for "tests" field of moduli(5)
69 * Specifies the methods used in checking for primality.
70 * Usually, more than one test is used.
71 */
72#define MODULI_TESTS_UNTESTED		(0x00)
73#define MODULI_TESTS_COMPOSITE		(0x01)
74#define MODULI_TESTS_SIEVE		(0x02)
75#define MODULI_TESTS_MILLER_RABIN	(0x04)
76#define MODULI_TESTS_JACOBI		(0x08)
77#define MODULI_TESTS_ELLIPTIC		(0x10)
78
79
80#endif
81