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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 #include <openssl/bn.h>
24 
25 struct modp_group {
26 	BIGNUM *p, *q, *g;
27 };
28 
29 BIGNUM *bn_rand_range_gt_one(const BIGNUM *high);
30 int hash_buffer(const u_char *, u_int, const EVP_MD *, u_char **, u_int *);
31 void debug3_bn(const BIGNUM *, const char *, ...)
32     __attribute__((__nonnull__ (2)))
33     __attribute__((format(printf, 2, 3)));
34 void debug3_buf(const u_char *, u_int, const char *, ...)
35     __attribute__((__nonnull__ (3)))
36     __attribute__((format(printf, 3, 4)));
37 struct modp_group *modp_group_from_g_and_safe_p(const char *, const char *);
38 void modp_group_free(struct modp_group *);
39 
40 /* Signature and verification functions */
41 int
42 schnorr_sign(const BIGNUM *grp_p, const BIGNUM *grp_q, const BIGNUM *grp_g,
43     const EVP_MD *evp_md, const BIGNUM *x, const BIGNUM *g_x,
44     const u_char *id, u_int idlen, BIGNUM **r_p, BIGNUM **e_p);
45 int
46 schnorr_sign_buf(const BIGNUM *grp_p, const BIGNUM *grp_q, const BIGNUM *grp_g,
47     const BIGNUM *x, const BIGNUM *g_x, const u_char *id, u_int idlen,
48     u_char **sig, u_int *siglen);
49 int
50 schnorr_verify(const BIGNUM *grp_p, const BIGNUM *grp_q, const BIGNUM *grp_g,
51     const EVP_MD *evp_md, const BIGNUM *g_x, const u_char *id, u_int idlen,
52     const BIGNUM *r, const BIGNUM *e);
53 int
54 schnorr_verify_buf(const BIGNUM *grp_p, const BIGNUM *grp_q,
55     const BIGNUM *grp_g,
56     const BIGNUM *g_x, const u_char *id, u_int idlen,
57     const u_char *sig, u_int siglen);
58 
59 #endif /* JPAKE_H */
60 
61