
#include "aes.h"
#ifdef EN_ALG_SW
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/**
 * 
 */
static const sint32 S[16][16] = { 
	{0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,},
	{0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,},
	{0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,},
	{0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,},
	{0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,},
	{0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,},
	{0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,},
	{0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,},
	{0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,},
	{0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,},
	{0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,},
	{0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,},
	{0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,},
	{0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,},
	{0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,},
	{0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16},
	};

/**
 *
 */
static const sint32 S2[16][16] = 
{ 
	{0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,},
	{0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,},
	{0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,},
	{0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25,},
	{0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92,},
	{0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,},
	{0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06,},
	{0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b,},
	{0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,},
	{0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e,},
	{0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,},
	{0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,},
	{0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,},
	{0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,},
	{0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,},
	{0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d },
};

/**
 */
static sint32 getLeft4Bit(sint32 num) {
	sint32 left = num & 0x000000f0;
	return left >> 4;
}

/**
 */
static sint32 getRight4Bit(sint32 num) {
	return num & 0x0000000f;
}
/**
 */
static sint32 getNumFromSBox(sint32 index) {
	sint32 row = getLeft4Bit(index);
	sint32 col = getRight4Bit(index);
	return S[row][col];
}

/**
 */
static sint32 getIntFromChar(sint8 c) {
	sint32 result = (sint32) c;
	return result & 0x000000ff;
}

/**
 */
static void convertToIntArray(sint8 *str, sint32 pa[4][4]) {
	sint32 k = 0;
	sint32 i, j;
	
	for(i = 0; i < 4; i++)
		for(j = 0; j < 4; j++) {
			pa[j][i] = getIntFromChar(str[k]);
			k++;
		}
}


/**
 */
static sint32 getWordFromStr(sint8 *str) {
	sint32 one, two, three, four;
	
	one = getIntFromChar(str[0]);
	one = one << 24;
	two = getIntFromChar(str[1]);
	two = two << 16;
	three = getIntFromChar(str[2]);
	three = three << 8;
	four = getIntFromChar(str[3]);
	return one | two | three | four;
}

/**
 */
static void splitIntToArray(sint32 num, sint32 array[4]) {
	sint32 one, two, three;
	
	one = num >> 24;
	array[0] = one & 0x000000ff;
	two = num >> 16;
	array[1] = two & 0x000000ff;
	three = num >> 8;
	array[2] = three & 0x000000ff;
	array[3] = num & 0x000000ff;
}

/**
 */
static void leftLoop4int(sint32 array[4], sint32 step) {
	sint32 temp[4];
	sint32 i;
	sint32 index;
	
	for(i = 0; i < 4; i++)
		temp[i] = array[i];

	index = step % 4 == 0 ? 0 : step % 4;
	for(i = 0; i < 4; i++){
		array[i] = temp[index];
		index++;
		index = index % 4;
	}
}

/**
 */
static sint32 mergeArrayToInt(sint32 array[4]) {
	sint32 one = array[0] << 24;
	sint32 two = array[1] << 16;
	sint32 three = array[2] << 8;
	sint32 four = array[3];
	return one | two | three | four;
}

/**
 */
static const sint32 Rcon[10] = { 0x01000000, 0x02000000,
	0x04000000, 0x08000000,
	0x10000000, 0x20000000,
	0x40000000, 0x80000000,
	0x1b000000, 0x36000000 };
/**
 */
static sint32 T(sint32 num, sint32 round) {
	sint32 numArray[4];
	sint32 i;
	sint32 result;
	
	splitIntToArray(num, numArray);
	leftLoop4int(numArray, 1);


	for(i = 0; i < 4; i++)
		numArray[i] = getNumFromSBox(numArray[i]);

	result = mergeArrayToInt(numArray);
	return result ^ Rcon[round];
}

static sint32 w[44];

/**
 */
static void extendKey(sint8 *key) {
	sint32 i;
	sint32 j;
	
	for( i = 0; i < 4; i++)
		w[i] = getWordFromStr(key + i * 4);

	for(i = 4, j = 0; i < 44; i++) {
		if( i % 4 == 0) {
			w[i] = w[i - 4] ^ T(w[i - 1], j);
			j++;
		}else {
			w[i] = w[i - 4] ^ w[i - 1];
		}
	}

}

/**
 */
static void addRoundKey(sint32 array[4][4], sint32 round) {
	sint32 warray[4];
	sint32 i, j;
	
	for(i = 0; i < 4; i++) {

		splitIntToArray(w[ round * 4 + i], warray);

		for(j = 0; j < 4; j++) {
			array[j][i] = array[j][i] ^ warray[j];
		}
	}
}

/**
 */
static void subBytes(sint32 array[4][4]){
	sint32 i, j;
	
	for(i = 0; i < 4; i++)
		for(j = 0; j < 4; j++)
			array[i][j] = getNumFromSBox(array[i][j]);
}

/**
 */
static void shiftRows(sint32 array[4][4]) {
	sint32 rowTwo[4], rowThree[4], rowFour[4];
	sint32 i;
	
	for(i = 0; i < 4; i++) {
		rowTwo[i] = array[1][i];
		rowThree[i] = array[2][i];
		rowFour[i] = array[3][i];
	}
	
	leftLoop4int(rowTwo, 1);
	leftLoop4int(rowThree, 2);
	leftLoop4int(rowFour, 3);

	for(i = 0; i < 4; i++) {
		array[1][i] = rowTwo[i];
		array[2][i] = rowThree[i];
		array[3][i] = rowFour[i];
	}
}

/**
 */
static const sint32 colM[4][4] = 
{ 
	{2, 3, 1, 1,},
	{1, 2, 3, 1,},
	{1, 1, 2, 3,},
	{3, 1, 1, 2,},
};

static sint32 GFMul2(sint32 s) {
	sint32 result = s << 1;
	sint32 a7 = result & 0x00000100;

	if(a7 != 0) {
		result = result & 0x000000ff;
		result = result ^ 0x1b;
	}

	return result;
}

static sint32 GFMul3(sint32 s) {
	return GFMul2(s) ^ s;
}

static sint32 GFMul4(sint32 s) {
	return GFMul2(GFMul2(s));
}

static sint32 GFMul8(sint32 s) {
	return GFMul2(GFMul4(s));
}

static sint32 GFMul9(sint32 s) {
	return GFMul8(s) ^ s;
}

static sint32 GFMul11(sint32 s) {
	return GFMul9(s) ^ GFMul2(s);
}

static sint32 GFMul12(sint32 s) {
	return GFMul8(s) ^ GFMul4(s);
}

static sint32 GFMul13(sint32 s) {
	return GFMul12(s) ^ s;
}

static sint32 GFMul14(sint32 s) {
	return GFMul12(s) ^ GFMul2(s);
}

/**
 */
static sint32 GFMul(sint32 n, sint32 s) {
	sint32 result;

	if(n == 1)
		result = s;
	else if(n == 2)
		result = GFMul2(s);
	else if(n == 3)
		result = GFMul3(s);
	else if(n == 0x9)
		result = GFMul9(s);
	else if(n == 0xb)//11
		result = GFMul11(s);
	else if(n == 0xd)//13
		result = GFMul13(s);
	else if(n == 0xe)//14
		result = GFMul14(s);

	return result;
}
/**
 */
static void mixColumns(sint32 array[4][4]) {

	sint32 tempArray[4][4];
	sint32 i, j;

	for(i = 0; i < 4; i++)
		for(j = 0; j < 4; j++)
			tempArray[i][j] = array[i][j];

	for(i = 0; i < 4; i++)
		for( j = 0; j < 4; j++){
			array[i][j] = GFMul(colM[i][0],tempArray[0][j]) ^ GFMul(colM[i][1],tempArray[1][j]) 
				^ GFMul(colM[i][2],tempArray[2][j]) ^ GFMul(colM[i][3], tempArray[3][j]);
		}
}
/**
 */
static void convertArrayToStr(sint32 array[4][4], sint8 *str) {
	sint32 i, j;
	
	for( i = 0; i < 4; i++)
		for(j = 0; j < 4; j++)
			*str++ = (sint8)array[j][i];	
}
/**
 */
static sint32 checkKeyLen(sint32 len) {
	if(len == 16)
		return 1;
	else
		return 0;
}

/**
 */
void aes(sint8 *p, sint32 plen, sint8 *key, sint8 * cipher){
	sint32 pArray[4][4];
	sint32 i, k;
	sint32 keylen = 16;
	if(plen == 0 || plen % 16 != 0) {
		return;
	}

	if(!checkKeyLen(keylen)) {
		return;
	}

	extendKey(key);
	

	for(k = 0; k < plen; k += 16) {	
		convertToIntArray(p + k, pArray);

		addRoundKey(pArray, 0);

		for(i = 1; i < 10; i++){

			subBytes(pArray);

			shiftRows(pArray);

			mixColumns(pArray);

			addRoundKey(pArray, i);

		}

		subBytes(pArray);

		shiftRows(pArray);
		addRoundKey(pArray, 10);

		convertArrayToStr(pArray, cipher + k);
	}
}
/**
 */
static sint32 getNumFromS1Box(sint32 index) {
	sint32 row = getLeft4Bit(index);
	sint32 col = getRight4Bit(index);
	return S2[row][col];
}
/**
 */
static void deSubBytes(sint32 array[4][4]) {
	sint32 i, j;
	for(i = 0; i < 4; i++)
		for(j = 0; j < 4; j++)
			array[i][j] = getNumFromS1Box(array[i][j]);
}
/**
 */
static void rightLoop4int(sint32 array[4], sint32 step) {
	sint32 temp[4];
	sint32 i;
	sint32 index;
	
	for(i = 0; i < 4; i++)
		temp[i] = array[i];

	index = step % 4 == 0 ? 0 : step % 4;
	index = 3 - index;
	for(i = 3; i >= 0; i--) {
		array[i] = temp[index];
		index--;
		index = index == -1 ? 3 : index;
	}
}

/**
 */
static void deShiftRows(sint32 array[4][4]) {
	sint32 rowTwo[4], rowThree[4], rowFour[4];
	sint32 i;
	
	for(i = 0; i < 4; i++) {
		rowTwo[i] = array[1][i];
		rowThree[i] = array[2][i];
		rowFour[i] = array[3][i];
	}

	rightLoop4int(rowTwo, 1);
	rightLoop4int(rowThree, 2);
	rightLoop4int(rowFour, 3);

	for(i = 0; i < 4; i++) {
		array[1][i] = rowTwo[i];
		array[2][i] = rowThree[i];
		array[3][i] = rowFour[i];
	}
}
/**
 */
static const sint32 deColM[4][4] = 
{ 
	{0xe, 0xb, 0xd, 0x9,},
	{0x9, 0xe, 0xb, 0xd,},
	{0xd, 0x9, 0xe, 0xb,},
	{0xb, 0xd, 0x9, 0xe,}, 
};

/**
 */
static void deMixColumns(sint32 array[4][4]) {
	sint32 tempArray[4][4];
	sint32 i, j;

	for( i = 0; i < 4; i++)
		for( j = 0; j < 4; j++)
			tempArray[i][j] = array[i][j];

	for( i = 0; i < 4; i++)
		for( j = 0; j < 4; j++){
			array[i][j] = GFMul(deColM[i][0],tempArray[0][j]) ^ GFMul(deColM[i][1],tempArray[1][j]) 
				^ GFMul(deColM[i][2],tempArray[2][j]) ^ GFMul(deColM[i][3], tempArray[3][j]);
		}
}
/**
 */
static void addRoundTowArray(sint32 aArray[4][4],sint32 bArray[4][4]) {
	sint32 i, j;
	
	for( i = 0; i < 4; i++)
		for( j = 0; j < 4; j++)
			aArray[i][j] = aArray[i][j] ^ bArray[i][j];
}
/**
 */
static void getArrayFrom4W(sint32 i, sint32 array[4][4]) {
	sint32 index = i * 4;
	sint32 colOne[4], colTwo[4], colThree[4], colFour[4];
	sint32 j;
	
	splitIntToArray(w[index], colOne);
	splitIntToArray(w[index + 1], colTwo);
	splitIntToArray(w[index + 2], colThree);
	splitIntToArray(w[index + 3], colFour);

	for( j= 0; j < 4; j++) {
		array[j][0] = colOne[j];
		array[j][1] = colTwo[j];
		array[j][2] = colThree[j];
		array[j][3] = colFour[j];
	}

}

/**
 */
void deAes(sint8 *c, sint32 clen, sint8 *key, sint8 * pPlainText) {

	sint32 keylen = 16;
	sint32 k, i;
	sint32 cArray[4][4];
	sint32 wArray[4][4];
	
	if(clen == 0 || clen % 16 != 0) {
		return;
	}

	if(!checkKeyLen(keylen)) {
		return;
	}

	extendKey(key);
	
	for(k = 0; k < clen; k += 16) {
		convertToIntArray(c + k, cArray);


		addRoundKey(cArray, 10);

		
		for(i = 9; i >= 1; i--) {
			deSubBytes(cArray);

			deShiftRows(cArray);

			deMixColumns(cArray);
			getArrayFrom4W(i, wArray);
			deMixColumns(wArray);

			addRoundTowArray(cArray, wArray);
		}

		deSubBytes(cArray);

		deShiftRows(cArray);

		addRoundKey(cArray, 0);

		convertArrayToStr(cArray, pPlainText + k);

	}
}
#endif

