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/* $OpenBSD: yubikey.h,v 1.3 2013/06/04 18:49:12 mcbride Exp $ */
/*
* Written by Simon Josefsson <simon@josefsson.org>.
* Copyright (c) 2006, 2007, 2008, 2009, 2010 Yubico AB
* Copyright (c) 2010 Daniel Hartmeier <daniel@benzedrine.cx>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef __YUBIKEY_H__
#define __YUBIKEY_H__
#include <stdint.h>
#include <string.h>
#define YUBIKEY_BLOCK_SIZE 16
#define YUBIKEY_KEY_SIZE 16
#define YUBIKEY_TOKEN_SIZE 32
#define YUBIKEY_UID_SIZE 6
#define YUBIKEY_CRC_OK_RESIDUE 0xf0b8
#define yubikey_counter(ctr) ((ctr) & 0x7FFF)
#define yubikey_capslock(ctr) ((ctr) & 0x8000)
#define yubikey_crc_ok_p(tok) \
(yubikey_crc16 ((tok), YUBIKEY_BLOCK_SIZE) == YUBIKEY_CRC_OK_RESIDUE)
typedef struct {
uint8_t uid[YUBIKEY_UID_SIZE];
uint16_t ctr;
uint16_t tstpl;
uint8_t tstph;
uint8_t use;
uint16_t rnd;
uint16_t crc;
} yubikey_token_st;
typedef yubikey_token_st *yubikey_token_t;
extern int yubikey_parse(const uint8_t token[YUBIKEY_BLOCK_SIZE],
const uint8_t key[YUBIKEY_KEY_SIZE], yubikey_token_t out, int index);
extern void yubikey_modhex_decode(char *dst, const char *src, size_t dstsize);
extern void yubikey_hex_encode(char *dst, const char *src, size_t srcsize);
extern void yubikey_hex_decode(char *dst, const char *src, size_t dstsize);
extern uint16_t yubikey_crc16(const uint8_t *buf, size_t buf_size);
extern void yubikey_aes_decrypt(uint8_t *state, const uint8_t *key);
#endif
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