/* ====================================================================
 * 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/)"
 *
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 * 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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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 */

#include <stdio.h>
#include <openssl/sms4.h>
#include "sms4_lcl.h"


#define L32(x)						\
	((x) ^						\
	ROT32((x),  2) ^				\
	ROT32((x), 10) ^				\
	ROT32((x), 18) ^				\
	ROT32((x), 24))

#define ROUND(x0, x1, x2, x3, x4, i)			\
	x4 = x1 ^ x2 ^ x3 ^ *(rk + i);			\
	x4 = S32(x4);					\
	x4 = x0 ^ L32(x4)

void sms4_encrypt(const unsigned char *in, unsigned char *out, const sms4_key_t *key)
{
	const uint32_t *rk = key->rk;
	uint32_t x0, x1, x2, x3, x4;

	x0 = GET32(in     );
	x1 = GET32(in +  4);
	x2 = GET32(in +  8);
	x3 = GET32(in + 12);

	ROUNDS(x0, x1, x2, x3, x4);

	PUT32(x0, out     );
	PUT32(x4, out +  4);
	PUT32(x3, out +  8);
	PUT32(x2, out + 12);

	x0 = x1 = x2 = x3 = x4 = 0;
}
