/* ====================================================================
 * Copyright (c) 2015 - 2016 The GmSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. 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.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the GmSSL Project.
 *    (http://gmssl.org/)"
 *
 * 4. The name "GmSSL Project" must not be used to endorse or promote
 *    products derived from this software without prior written
 *    permission. For written permission, please contact
 *    guanzhi1980@gmail.com.
 *
 * 5. Products derived from this software may not be called "GmSSL"
 *    nor may "GmSSL" appear in their names without prior written
 *    permission of the GmSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the GmSSL Project
 *    (http://gmssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE GmSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 GmSSL PROJECT OR
 * ITS 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.
 * ====================================================================
 */
/* The implementation of
 * GM/T 0021-2012 One Time Password Application of Cryptography Algorithm
 */

#ifndef HEADER_OTP_H
#define HEADER_OTP_H

#include <openssl/opensslconf.h>
#ifndef OPENSSL_NO_OTP

#ifdef __cplusplus
extern "C" {
#endif

/* OTP reference to the GM/T OTP specification
 * type should be a valid md nid or a ECB cipher nid
 * te is the time period in the range [1, 60]
 * event is the C in ID = {T|C|O}
 * opt is the O in ID = {T|C|O}
 * otp_digits is the number of digits of otp, choose in the range [4, 8]
 * otp the output otp value, convert to digits with snprintf()
 */
typedef struct OTP_PARAMS_st {
	int type;
	int te;
	void *option;
	size_t option_size;
	int otp_digits;
	/* adjust the clock in seconds */
	int offset;
} OTP_PARAMS;

int OTP_generate(const OTP_PARAMS *params, const void *event, size_t eventlen,
	unsigned int *otp, const unsigned char *key, size_t keylen);

/* BEGIN ERROR CODES */
/*
 * The following lines are auto generated by the script mkerr.pl. Any changes
 * made after this point may be overwritten when the script is next run.
 */

int ERR_load_OTP_strings(void);

/* Error codes for the OTP functions. */

/* Function codes. */
# define OTP_F_OTP_GENERATE                               100

/* Reason codes. */
# define OTP_R_CMAC_FAILURE                               101
# define OTP_R_INVALID_PARAMS                             100

# ifdef  __cplusplus
}
# endif
#endif
#endif