1/* $OpenBSD: schnorr.h,v 1.1 2009/03/05 07:18:19 djm Exp $ */
2/*
3 * Copyright (c) 2009 Damien Miller.  All rights reserved.
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18#ifndef SCHNORR_H
19#define SCHNORR_H
20
21#include <sys/types.h>
22
23#ifdef __APPLE_CRYPTO__
24#include "ossl-bn.h"
25#else
26#include <openssl/bn.h>
27#endif
28
29struct modp_group {
30	BIGNUM *p, *q, *g;
31};
32
33BIGNUM *bn_rand_range_gt_one(const BIGNUM *high);
34int hash_buffer(const u_char *, u_int, const EVP_MD *, u_char **, u_int *);
35void debug3_bn(const BIGNUM *, const char *, ...)
36    __attribute__((__nonnull__ (2)))
37    __attribute__((format(printf, 2, 3)));
38void debug3_buf(const u_char *, u_int, const char *, ...)
39    __attribute__((__nonnull__ (3)))
40    __attribute__((format(printf, 3, 4)));
41struct modp_group *modp_group_from_g_and_safe_p(const char *, const char *);
42void modp_group_free(struct modp_group *);
43
44/* Signature and verification functions */
45int
46schnorr_sign(const BIGNUM *grp_p, const BIGNUM *grp_q, const BIGNUM *grp_g,
47    const EVP_MD *evp_md, const BIGNUM *x, const BIGNUM *g_x,
48    const u_char *id, u_int idlen, BIGNUM **r_p, BIGNUM **e_p);
49int
50schnorr_sign_buf(const BIGNUM *grp_p, const BIGNUM *grp_q, const BIGNUM *grp_g,
51    const BIGNUM *x, const BIGNUM *g_x, const u_char *id, u_int idlen,
52    u_char **sig, u_int *siglen);
53int
54schnorr_verify(const BIGNUM *grp_p, const BIGNUM *grp_q, const BIGNUM *grp_g,
55    const EVP_MD *evp_md, const BIGNUM *g_x, const u_char *id, u_int idlen,
56    const BIGNUM *r, const BIGNUM *e);
57int
58schnorr_verify_buf(const BIGNUM *grp_p, const BIGNUM *grp_q,
59    const BIGNUM *grp_g,
60    const BIGNUM *g_x, const u_char *id, u_int idlen,
61    const u_char *sig, u_int siglen);
62
63#endif /* JPAKE_H */
64
65