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dh.h
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 
31 struct dhgroup {
32  int size;
33  BIGNUM *g;
34  BIGNUM *p;
35 };
36 
37 DH *choose_dh(int, int, int);
38 DH *dh_new_group_asc(const char *, const char *);
39 DH *dh_new_group(BIGNUM *, BIGNUM *);
40 DH *dh_new_group1(void);
41 DH *dh_new_group14(void);
42 DH *dh_new_group16(void);
43 DH *dh_new_group18(void);
44 DH *dh_new_group_fallback(int);
45 
46 int dh_gen_key(DH *, int);
47 int dh_pub_is_valid(const DH *, const BIGNUM *);
48 int dh_is_known_group(const DH *);
49 
50 u_int dh_estimate(int);
51 void dh_set_moduli_file(const char *);
52 
53 /*
54  * Max value from RFC4419.
55  * Min value from RFC8270.
56  */
57 #define DH_GRP_MIN 2048
58 #define DH_GRP_MAX 8192
59 
60 /*
61  * Values for "type" field of moduli(5)
62  * Specifies the internal structure of the prime modulus.
63  */
64 #define MODULI_TYPE_UNKNOWN (0)
65 #define MODULI_TYPE_UNSTRUCTURED (1)
66 #define MODULI_TYPE_SAFE (2)
67 #define MODULI_TYPE_SCHNORR (3)
68 #define MODULI_TYPE_SOPHIE_GERMAIN (4)
69 #define MODULI_TYPE_STRONG (5)
70 
71 /*
72  * Values for "tests" field of moduli(5)
73  * Specifies the methods used in checking for primality.
74  * Usually, more than one test is used.
75  */
76 #define MODULI_TESTS_UNTESTED (0x00)
77 #define MODULI_TESTS_COMPOSITE (0x01)
78 #define MODULI_TESTS_SIEVE (0x02)
79 #define MODULI_TESTS_MILLER_RABIN (0x04)
80 #define MODULI_TESTS_JACOBI (0x08)
81 #define MODULI_TESTS_ELLIPTIC (0x10)
82 
83 #endif /* WITH_OPENSSL */
84 
85 #endif /* DH_H */
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