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/* $OpenBSD: jpake.h,v 1.1 2008/11/04 08:22:13 djm Exp $ */
/*
* Copyright (c) 2008 Damien Miller. All rights reserved.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef JPAKE_H
#define JPAKE_H
#include <sys/types.h>
#include <openssl/bn.h>
/* Set JPAKE_DEBUG in CFLAGS for privacy-violating debugging */
#ifndef JPAKE_DEBUG
# define JPAKE_DEBUG_BN(a)
# define JPAKE_DEBUG_BUF(a)
# define JPAKE_DEBUG_CTX(a)
#else
# define JPAKE_DEBUG_BN(a) jpake_debug3_bn a
# define JPAKE_DEBUG_BUF(a) jpake_debug3_buf a
# define JPAKE_DEBUG_CTX(a) jpake_dump a
#endif /* SCHNORR_DEBUG */
struct jpake_group {
BIGNUM *p, *q, *g;
};
#define KZP_ID_LEN 16 /* Length of client and server IDs */
struct jpake_ctx {
/* Parameters */
struct jpake_group *grp;
/* Private values shared by client and server */
BIGNUM *s; /* Secret (salted, crypted password) */
BIGNUM *k; /* Derived key */
/* Client private values (NULL for server) */
BIGNUM *x1; /* random in Zq */
BIGNUM *x2; /* random in Z*q */
/* Server private values (NULL for server) */
BIGNUM *x3; /* random in Zq */
BIGNUM *x4; /* random in Z*q */
/* Step 1: C->S */
u_char *client_id; /* Anti-replay nonce */
u_int client_id_len;
BIGNUM *g_x1; /* g^x1 */
BIGNUM *g_x2; /* g^x2 */
/* Step 1: S->C */
u_char *server_id; /* Anti-replay nonce */
u_int server_id_len;
BIGNUM *g_x3; /* g^x3 */
BIGNUM *g_x4; /* g^x4 */
/* Step 2: C->S */
BIGNUM *a; /* g^((x1+x3+x4)*x2*s) */
/* Step 2: S->C */
BIGNUM *b; /* g^((x1+x2+x3)*x4*s) */
/* Confirmation: C->S */
u_char *h_k_cid_sessid; /* H(k || client_id || session_id) */
u_int h_k_cid_sessid_len;
/* Confirmation: S->C */
u_char *h_k_sid_sessid; /* H(k || server_id || session_id) */
u_int h_k_sid_sessid_len;
};
/* jpake.c */
struct jpake_group *jpake_default_group(void);
BIGNUM *bn_rand_range_gt_one(const BIGNUM *high);
int hash_buffer(const u_char *, u_int, const EVP_MD *, u_char **, u_int *);
void jpake_debug3_bn(const BIGNUM *, const char *, ...)
__attribute__((__nonnull__ (2)))
__attribute__((format(printf, 2, 3)));
void jpake_debug3_buf(const u_char *, u_int, const char *, ...)
__attribute__((__nonnull__ (3)))
__attribute__((format(printf, 3, 4)));
void jpake_dump(struct jpake_ctx *, const char *, ...)
__attribute__((__nonnull__ (2)))
__attribute__((format(printf, 2, 3)));
struct jpake_ctx *jpake_new(void);
void jpake_free(struct jpake_ctx *);
void jpake_step1(struct jpake_group *, u_char **, u_int *,
BIGNUM **, BIGNUM **, BIGNUM **, BIGNUM **,
u_char **, u_int *, u_char **, u_int *);
void jpake_step2(struct jpake_group *, BIGNUM *,
BIGNUM *, BIGNUM *, BIGNUM *, BIGNUM *,
const u_char *, u_int, const u_char *, u_int,
const u_char *, u_int, const u_char *, u_int,
BIGNUM **, u_char **, u_int *);
void jpake_confirm_hash(const BIGNUM *,
const u_char *, u_int,
const u_char *, u_int,
u_char **, u_int *);
void jpake_key_confirm(struct jpake_group *, BIGNUM *, BIGNUM *,
BIGNUM *, BIGNUM *, BIGNUM *, BIGNUM *, BIGNUM *,
const u_char *, u_int, const u_char *, u_int,
const u_char *, u_int, const u_char *, u_int,
BIGNUM **, u_char **, u_int *);
int jpake_check_confirm(const BIGNUM *, const u_char *, u_int,
const u_char *, u_int, const u_char *, u_int);
/* schnorr.c */
int schnorr_sign(const BIGNUM *, const BIGNUM *, const BIGNUM *,
const BIGNUM *, const BIGNUM *, const u_char *, u_int ,
u_char **, u_int *);
int schnorr_verify(const BIGNUM *, const BIGNUM *, const BIGNUM *,
const BIGNUM *, const u_char *, u_int,
const u_char *, u_int);
#endif /* JPAKE_H */
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