#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "aes.h"
 
int one;
int two;
int three;
int four;
int index;
int result;
int pArray[4][4];
int cArray[4][4];
int wArray[4][4];
int i,k;
/**
 * S盒
 */
static const int 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 };
 
/**
 * 逆S盒
 */
static const int 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 };
 
/**
 * 获取整形数据的低8位的左4个位
 */
static int getLeft4Bit(int num) {
    int left = num & 0x000000f0;
    return left >> 4;
}
 
/**
 * 获取整形数据的低8位的右4个位
 */
static int getRight4Bit(int num) {
    return num & 0x0000000f;
}
/**
 * 根据索引，从S盒中获得元素
 */
static int getNumFromSBox(int index) {
    int row = getLeft4Bit(index);
    int col = getRight4Bit(index);
    return S[row][col];
}
 
/**
 * 把一个字符转变成整型
 */
static int getIntFromChar(char c) {
    int result = (int) c;
    return result & 0x000000ff;
}
 
/**
 * 把16个字符转变成4X4的数组，
 * 该矩阵中字节的排列顺序为从上到下，
 * 从左到右依次排列。
 */
static void convertToIntArray(char *str, int pa[4][4]) {
    int k = 0,i=0,j=0;
    for(i = 0; i < 4; i++)
        for(j = 0; j < 4; j++) {
            pa[j][i] = getIntFromChar(str[k]);
            k++;
        }
}
 
/**
 * 打印4X4的数组
 */
static void printArray(int a[4][4]) {
int i,j;
    for(i = 0; i < 4; i++){
        for(j = 0; j < 4; j++)
            printf("a[%d][%d] = 0x%x ", i, j, a[i][j]);
        printf("\n");
    }
    printf("\n");
}
 
/**
 * 打印字符串的ASSCI，
 * 以十六进制显示。
 */
static void printASSCI(char *str, int len) {
int i;
    for(i = 0; i < len; i++)
        printf("0x%x ", getIntFromChar(str[i]));
    printf("\n");
}
 
/**
 * 把连续的4个字符合并成一个4字节的整型
 */
static int getWordFromStr(char *str) 
{
    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;
}
 
/**
 * 把一个4字节的数的第一、二、三、四个字节取出，
 * 入进一个4个元素的整型数组里面。
 */
static void splitIntToArray(int num, int array[4]) {
    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;
}
 
/**
 * 将数组中的元素循环左移step位
 */
static void leftLoop4int(int array[4], int step) {
    int temp[4];
	int i;
    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;
    }
}
 
/**
 * 把数组中的第一、二、三和四元素分别作为
 * 4字节整型的第一、二、三和四字节，合并成一个4字节整型
 */
static int mergeArrayToInt(int array[4]) {
    int one = array[0] << 24;
    int two = array[1] << 16;
    int three = array[2] << 8;
    int four = array[3];
    return one | two | three | four;
}
 
/**
 * 常量轮值表
 */
static const int Rcon[10] = { 0x01000000, 0x02000000,
    0x04000000, 0x08000000,
    0x10000000, 0x20000000,
    0x40000000, 0x80000000,
    0x1b000000, 0x36000000 };
/**
 * 密钥扩展中的T函数
 */
static int T(int num, int round) {
    int numArray[4];
    splitIntToArray(num, numArray);
    leftLoop4int(numArray, 1);//字循环
 
    //字节代换
    for(i = 0; i < 4; i++)
        numArray[i] = getNumFromSBox(numArray[i]);
 
    result = mergeArrayToInt(numArray);
    return result ^ Rcon[round];
}
 
//密钥对应的扩展数组
static int w[44];
 
/**
 * 扩展密钥，结果是把w[44]中的每个元素初始化
 */
static void extendKey(char *key)
{
	int  i,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++;//下一轮
		}
		else 
			w[i] = w[i - 4] ^ w[i - 1];
	}
}
 
/**
 * 轮密钥加
 */
static void addRoundKey(int array[4][4], int round) {
    int warray[4];
	int 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];
        }
    }
}
 
/**
 * 字节代换
 */
static void subBytes(int array[4][4]){
int i,j;
    for(i = 0; i < 4; i++)
        for( j = 0; j < 4; j++)
            array[i][j] = getNumFromSBox(array[i][j]);
}
 
/**
 * 行移位
 */
static void shiftRows(int array[4][4]) {
    int rowTwo[4], rowThree[4], rowFour[4];
    //复制状态矩阵的第2,3,4行
    int i;
 
    for(i = 0; i < 4; i++) {
        rowTwo[i] = array[1][i];
        rowThree[i] = array[2][i];
        rowFour[i] = array[3][i];
    }
    //循环左移相应的位数
    leftLoop4int(rowTwo, 1);
    leftLoop4int(rowThree, 2);
    leftLoop4int(rowFour, 3);
 
    //把左移后的行复制回状态矩阵中
    for( i = 0; i < 4; i++) {
        array[1][i] = rowTwo[i];
        array[2][i] = rowThree[i];
        array[3][i] = rowFour[i];
    }
}
 
/**
 * 列混合要用到的矩阵
 */
static const int colM[4][4] = { 2, 3, 1, 1,
    1, 2, 3, 1,
    1, 1, 2, 3,
    3, 1, 1, 2 };
 
static int GFMul2(int s) {
    int result = s << 1;
    int a7 = result & 0x00000100;
 
    if(a7 != 0) {
        result = result & 0x000000ff;
        result = result ^ 0x1b;
    }
 
    return result;
}
 
static int GFMul3(int s) {
    return GFMul2(s) ^ s;
}
 
static int GFMul4(int s) {
    return GFMul2(GFMul2(s));
}
 
static int GFMul8(int s) {
    return GFMul2(GFMul4(s));
}
 
static int GFMul9(int s) {
    return GFMul8(s) ^ s;
}
 
static int GFMul11(int s) {
    return GFMul9(s) ^ GFMul2(s);
}
 
static int GFMul12(int s) {
    return GFMul8(s) ^ GFMul4(s);
}
 
static int GFMul13(int s) {
    return GFMul12(s) ^ s;
}
 
static int GFMul14(int s) {
    return GFMul12(s) ^ GFMul2(s);
}
 
/**
 * GF上的二元运算
 */
static int GFMul(int n, int s) {
    int 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;
}
/**
 * 列混合
 */
static void mixColumns(int array[4][4]) {
 
    int tempArray[4][4];
	int 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]);
        }
}
/**
 * 把4X4数组转回字符串
 */
static void convertArrayToStr(int array[4][4], char *str) {
int i,j;
    for(i = 0; i < 4; i++)
        for(j = 0; j < 4; j++)
            *str++ = (char)array[j][i]; 
}
/**
 * 检查密钥长度
 */
static int checkKeyLen(int len) {
    if(len == 16)
        return 1;
    else
        return 0;
}
 
/**
 * 参数 p: 明文的字符串数组。
 * 参数 plen: 明文的长度。
 * 参数 key: 密钥的字符串数组。
 */
void aes(char *p, int plen, char *key){
 
    int keylen = strlen(key);
 
    if(!checkKeyLen(keylen)) {
        printf("keylen erro;keylen=%d\n",keylen);
        exit(0);
    }
 
    extendKey(key);//扩展密钥
    for(k = 0; k < plen; k += 16) { 
        convertToIntArray(p + k, pArray);
 
        addRoundKey(pArray, 0);//一开始的轮密钥加
 
        for(i = 1; i < 10; i++){//前9轮
 
            subBytes(pArray);//字节代换
 
            shiftRows(pArray);//行移位
 
            mixColumns(pArray);//列混合
 
            addRoundKey(pArray, i);
        }
 
        //第10轮
        subBytes(pArray);//字节代换
 
        shiftRows(pArray);//行移位
 
        addRoundKey(pArray, 10);
 
        convertArrayToStr(pArray, p + k);
    }
}
/**
 * 根据索引从逆S盒中获取值
 */
static int getNumFromS1Box(int index) {
    int row = getLeft4Bit(index);
    int col = getRight4Bit(index);
    return S2[row][col];
}
/**
 * 逆字节变换
 */
static void deSubBytes(int array[4][4]) {
	int i,j;
    for( i = 0; i < 4; i++)
        for(j = 0; j < 4; j++)
            array[i][j] = getNumFromS1Box(array[i][j]);
}
/**
 * 把4个元素的数组循环右移step位
 */
static void rightLoop4int(int array[4], int step) {
    int temp[4];	
	int i;
    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;
    }
}
 
/**
 * 逆行移位
 */
static void deShiftRows(int array[4][4]) {
    int rowTwo[4], rowThree[4], rowFour[4];
	int 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];
    }
}
/**
 * 逆列混合用到的矩阵
 */
static const int deColM[4][4] = { 0xe, 0xb, 0xd, 0x9,
    0x9, 0xe, 0xb, 0xd,
    0xd, 0x9, 0xe, 0xb,
    0xb, 0xd, 0x9, 0xe };
 
/**
 * 逆列混合
 */
static void deMixColumns(int array[4][4]) {
    int tempArray[4][4];
	int 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]);
        }
}
/**
 * 把两个4X4数组进行异或
 */
static void addRoundTowArray(int aArray[4][4],int bArray[4][4]) {
	int i,j;
    for(i = 0; i < 4; i++)
        for(j = 0; j < 4; j++)
            aArray[i][j] = aArray[i][j] ^ bArray[i][j];
}
/**
 * 从4个32位的密钥字中获得4X4数组，
 * 用于进行逆列混合
 */
static void getArrayFrom4W(int i, int array[4][4]) {
    int index = i * 4;
    int colOne[4], colTwo[4], colThree[4], colFour[4];
    splitIntToArray(w[index], colOne);
    splitIntToArray(w[index + 1], colTwo);
    splitIntToArray(w[index + 2], colThree);
    splitIntToArray(w[index + 3], colFour);
 
    for(i = 0; i < 4; i++) {
        array[i][0] = colOne[i];
        array[i][1] = colTwo[i];
        array[i][2] = colThree[i];
        array[i][3] = colFour[i];
    }
}
 
/**
 * 参数 c: 密文的字符串数组。
 * 参数 clen: 密文的长度。
 * 参数 key: 密钥的字符串数组。
 */
void deAes(char *c, int clen, char *key) {
 
    int keylen = strlen(key);
    if(clen == 0 || clen % 16 != 0) {
        printf("Ciphertext characters must be a multiple of 16! Now the length is zero:%d\n",clen);
        exit(0);
    }
 
    if(!checkKeyLen(keylen)) {
        printf("Key character length error! The lengths must be 16, 24, and 32. The current length is:%d\n",keylen);
        exit(0);
    }
 
    extendKey(key);//扩展密钥
    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, c + k);
 
    }
}