/*
  * Copyright (c) 2016 MediaTek Inc.  All rights reserved.
  *
  * This software is available to you under a choice of one of two
  * licenses.  You may choose to be licensed under the terms of the GNU
  * General Public License (GPL) Version 2, available from the file
  * COPYING in the main directory of this source tree, or the
  * BSD license below:
  *
  *     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.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */



const unsigned char ISbox[256] = {
0xd6,0x90,0xe9,0xfe,0xcc,0xe1,0x3d,0xb7,0x16,0xb6,0x14,0xc2,0x28,0xfb,0x2c,0x05,
0x2b,0x67,0x9a,0x76,0x2a,0xbe,0x04,0xc3,0xaa,0x44,0x13,0x26,0x49,0x86,0x06,0x99,
0x9c,0x42,0x50,0xf4,0x91,0xef,0x98,0x7a,0x33,0x54,0x0b,0x43,0xed,0xcf,0xac,0x62,
0xe4,0xb3,0x1c,0xa9,0xc9,0x08,0xe8,0x95,0x80,0xdf,0x94,0xfa,0x75,0x8f,0x3f,0xa6,
0x47,0x07,0xa7,0xfc,0xf3,0x73,0x17,0xba,0x83,0x59,0x3c,0x19,0xe6,0x85,0x4f,0xa8,
0x68,0x6b,0x81,0xb2,0x71,0x64,0xda,0x8b,0xf8,0xeb,0x0f,0x4b,0x70,0x56,0x9d,0x35,
0x1e,0x24,0x0e,0x5e,0x63,0x58,0xd1,0xa2,0x25,0x22,0x7c,0x3b,0x01,0x21,0x78,0x87,
0xd4,0x00,0x46,0x57,0x9f,0xd3,0x27,0x52,0x4c,0x36,0x02,0xe7,0xa0,0xc4,0xc8,0x9e,
0xea,0xbf,0x8a,0xd2,0x40,0xc7,0x38,0xb5,0xa3,0xf7,0xf2,0xce,0xf9,0x61,0x15,0xa1,
0xe0,0xae,0x5d,0xa4,0x9b,0x34,0x1a,0x55,0xad,0x93,0x32,0x30,0xf5,0x8c,0xb1,0xe3,
0x1d,0xf6,0xe2,0x2e,0x82,0x66,0xca,0x60,0xc0,0x29,0x23,0xab,0x0d,0x53,0x4e,0x6f,
0xd5,0xdb,0x37,0x45,0xde,0xfd,0x8e,0x2f,0x03,0xff,0x6a,0x72,0x6d,0x6c,0x5b,0x51,
0x8d,0x1b,0xaf,0x92,0xbb,0xdd,0xbc,0x7f,0x11,0xd9,0x5c,0x41,0x1f,0x10,0x5a,0xd8,
0x0a,0xc1,0x31,0x88,0xa5,0xcd,0x7b,0xbd,0x2d,0x74,0xd0,0x12,0xb8,0xe5,0xb4,0xb0,
0x89,0x69,0x97,0x4a,0x0c,0x96,0x77,0x7e,0x65,0xb9,0xf1,0x09,0xc5,0x6e,0xc6,0x84,
0x18,0xf0,0x7d,0xec,0x3a,0xdc,0x4d,0x20,0x79,0xee,0x5f,0x3e,0xd7,0xcb,0x39,0x48
};

const unsigned int CK[32] = {
	0x00070e15, 0x1c232a31, 0x383f464d, 0x545b6269,
	0x70777e85, 0x8c939aa1, 0xa8afb6bd, 0xc4cbd2d9,
	0xe0e7eef5, 0xfc030a11, 0x181f262d, 0x343b4249,
	0x50575e65, 0x6c737a81, 0x888f969d, 0xa4abb2b9,
	0xc0c7ced5, 0xdce3eaf1, 0xf8ff060d, 0x141b2229,
	0x30373e45, 0x4c535a61, 0x686f767d, 0x848b9299,
	0xa0a7aeb5, 0xbcc3cad1, 0xd8dfe6ed, 0xf4fb0209,
	0x10171e25, 0x2c333a41, 0x484f565d, 0x646b7279 };

#define Rotl(_x, _y) (((_x) << (_y)) | ((_x) >> (32 - (_y))))
#define getbyte(_x,_y) (((unsigned char *)&(_x))[_y])

#define ByteSub(_A) (ISbox[((unsigned int)_A) >> 24 & 0xFF] << 24 ^ \
                     ISbox[((unsigned int)_A) >> 16 & 0xFF] << 16 ^ \
                     ISbox[((unsigned int)_A) >>  8 & 0xFF] <<  8 ^ \
                     ISbox[((unsigned int)_A) & 0xFF])

#define L1(_B) ((_B) ^ Rotl(_B, 2) ^ Rotl(_B, 10) ^ Rotl(_B, 18) ^ Rotl(_B, 24))
#define L2(_B) ((_B) ^ Rotl(_B, 13) ^ Rotl(_B, 23))

#ifdef RT_BIG_ENDIAN
#define byteReverse(x0, x1, x2, x3)	/* Nothing */
#else
void byteReverse(unsigned int *x0, unsigned int *x1, unsigned int *x2, unsigned int *x3);
void byteReverse(unsigned int *x0, unsigned int *x1, unsigned int *x2, unsigned int *x3)
{
	 *x0 = Rotl(*x0, 16); *x0 = ((*x0 & 0x00FF00FF) << 8) ^ ((*x0 & 0xFF00FF00) >> 8);
	 *x1 = Rotl(*x1, 16); *x1 = ((*x1 & 0x00FF00FF) << 8) ^ ((*x1 & 0xFF00FF00) >> 8);
	 *x2 = Rotl(*x2, 16); *x2 = ((*x2 & 0x00FF00FF) << 8) ^ ((*x2 & 0xFF00FF00) >> 8);
	 *x3 = Rotl(*x3, 16); *x3 = ((*x3 & 0x00FF00FF) << 8) ^ ((*x3 & 0xFF00FF00) >> 8);
}
#endif /* RT_BIG_ENDIAN */

#define ENCRYPT  0
#define DECRYPT  1

void SMS4Crypt(unsigned char *Input, unsigned char *Output, unsigned int *rk)
{
	 unsigned int r, mid, x0, x1, x2, x3, *p;
	 p = (unsigned int *)Input;
	 x0 = p[0];
	 x1 = p[1];
	 x2 = p[2];
	 x3 = p[3];

	 byteReverse(&x0, &x1, &x2, &x3);
	for (r = 0; r < 32; r += 4)
	{
		mid = x1 ^ x2 ^ x3 ^ rk[r + 0];
		mid = ByteSub(mid);
		x0 ^= L1(mid);
		mid = x2 ^ x3 ^ x0 ^ rk[r + 1];
		mid = ByteSub(mid);
		x1 ^= L1(mid);
		mid = x3 ^ x0 ^ x1 ^ rk[r + 2];
		mid = ByteSub(mid);
		x2 ^= L1(mid);
		mid = x0 ^ x1 ^ x2 ^ rk[r + 3];
		mid = ByteSub(mid);
		x3 ^= L1(mid);
	}

	 byteReverse(&x0, &x1, &x2, &x3);

	 p = (unsigned int *)Output;
	 p[0] = x3;
	 p[1] = x2;
	 p[2] = x1;
	 p[3] = x0;

}


void SMS4KeyExt(unsigned char *Key, unsigned int *rk, unsigned int CryptFlag)
{
	 unsigned int r, mid, x0, x1, x2, x3, *p;
	 p = (unsigned int *)Key;
	 x0 = p[0];
	 x1 = p[1];
	 x2 = p[2];
	 x3 = p[3];

	 byteReverse(&x0, &x1, &x2, &x3);

	 x0 ^= 0xa3b1bac6;
	 x1 ^= 0x56aa3350;
	 x2 ^= 0x677d9197;
	 x3 ^= 0xb27022dc;
	 for (r = 0; r < 32; r += 4)
	 {
		  mid = x1 ^ x2 ^ x3 ^ CK[r + 0];
				  mid = ByteSub(mid);
		  rk[r + 0] = x0 ^= L2(mid);
		  mid = x2 ^ x3 ^ x0 ^ CK[r + 1];
		  mid = ByteSub(mid);
		  rk[r + 1] = x1 ^= L2(mid);
		  mid = x3 ^ x0 ^ x1 ^ CK[r + 2];
		  mid = ByteSub(mid);
		  rk[r + 2] = x2 ^= L2(mid);
		  mid = x0 ^ x1 ^ x2 ^ CK[r + 3];
		  mid = ByteSub(mid);
		  rk[r + 3] = x3 ^= L2(mid);
	 }
}

