/* ====================================================================
 * Copyright (c) 2014 - 2017 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,
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 * 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 SPECK_H
#define SPECK_H

/*
* define speck type to use 
*(one of SPECK_32_64, SPECK_64_128, SPECK_128_256)
*/
#define SPECK_32_64

#ifdef SPECK_32_64
#define SPECK_TYPE uint16_t
#define SPECK_ROUNDS 22
#define SPECK_KEY_LEN 4
#endif

#ifdef SPECK_64_128
#define SPECK_TYPE uint32_t
#define SPECK_ROUNDS 27
#define SPECK_KEY_LEN 4
#endif

#ifdef SPECK_128_256
#define SPECK_TYPE uint64_t
#define SPECK_ROUNDS 34
#define SPECK_KEY_LEN 4
#endif

#define num_word sizeof(SPECK_TYPE)
#include <sys/types.h>
#include <stdint.h>
#include <string.h>
#ifdef __cplusplus
extern "C" {
#endif

	typedef struct {
		unsigned char rk[num_word];
	} speck_key_t;

	void speck_set_encrypt_key(speck_key_t *key, const unsigned char *user_key);
	void speck_expand(SPECK_TYPE const K[SPECK_KEY_LEN], SPECK_TYPE S[SPECK_ROUNDS]);
	void speck_encrypt(SPECK_TYPE const pt[2], SPECK_TYPE ct[2], SPECK_TYPE const K[SPECK_ROUNDS]);
	void speck_decrypt(SPECK_TYPE const ct[2], SPECK_TYPE pt[2], SPECK_TYPE const K[SPECK_ROUNDS]);

#ifdef __cplusplus
}
#endif
#endif