schnorr.h

   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