#include <QDebug>
#include <QFile>
#include <string.h>
#include ""
const unsigned char AES::Sbox[16*16]=
{// populate the Sbox matrix
/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
/*0*/ 0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
/*1*/ 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
/*2*/ 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
/*3*/ 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
/*4*/ 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
/*5*/ 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
/*6*/ 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
/*7*/ 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
/*8*/ 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
/*9*/ 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
/*a*/ 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
/*b*/ 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
/*c*/ 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
/*d*/ 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
/*e*/ 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
/*f*/ 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16
};
const unsigned char AES::iSbox[16*16]=
{
// populate the iSbox matrix
/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
/*0*/ 0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,
/*1*/ 0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,
/*2*/ 0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,
/*3*/ 0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25,
/*4*/ 0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92,
/*5*/ 0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,
/*6*/ 0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06,
/*7*/ 0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b,
/*8*/ 0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,
/*9*/ 0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e,
/*a*/ 0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,
/*b*/ 0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,
/*c*/ 0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,
/*d*/ 0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,
/*e*/ 0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
/*f*/ 0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d
};
const unsigned char AES::Rcon[11*4]=
{
0x00, 0x00, 0x00, 0x00,
0x01, 0x00, 0x00, 0x00,
0x02, 0x00, 0x00, 0x00,
0x04, 0x00, 0x00, 0x00,
0x08, 0x00, 0x00, 0x00,
0x10, 0x00, 0x00, 0x00,
0x20, 0x00, 0x00, 0x00,
0x40, 0x00, 0x00, 0x00,
0x80, 0x00, 0x00, 0x00,
0x1b, 0x00, 0x00, 0x00,
0x36, 0x00, 0x00, 0x00
};
AES::AES(int keySize, unsigned char *key)
{
RunKeyExpansion(keySize, key);
}
void AES::RunKeyExpansion(int keySize, unsigned char* keyBytes)
{
SetNbNkNr(keySize); /* 设置密钥块数和轮数 */
memcpy(key, keyBytes, keySize);/* 字符串拷贝函数，把keyBytes的keysize个字符复制到key中 */
KeyExpansion(); /* 密钥扩展，必须提前做的初始化 */
}
void AES::SetNbNkNr(int keyS)
{
Nb = 4; // block size always = 4 words = 16 bytes = 128 bits for AES
if (keyS == Bits128)
{
Nk = 4; /* 4*4字节，128位密钥，10轮加密 */
Nr = 10;
}
else if (keyS == Bits192)
{
Nk = 6; /* 6*4字节，192位密钥，12轮加密 */
Nr = 12;
}
else if (keyS == Bits256)
{
Nk = 8; /* 8*4字节，256位密钥，14轮加密 */
Nr = 14;
}
}
/* 密码加密 */
void AES::KeyExpansion()
{
unsigned char result[4],result2[4];
/* 直接开辟空间,直接开辟最大的空间 */
memset(w,0,16*15);
int row;
/* 扩展密钥的前Nk个字就是基密钥Key，Nk=4,6,8得到初始密码 */
for (row = 0; row < Nk; row++){
w[4*row+0] = key[4*row];
w[4*row+1] = key[4*row+1];
w[4*row+2] = key[4*row+2];
w[4*row+3] = key[4*row+3];
}
unsigned char temp[4];
for (row = Nk; row < Nb * (Nr+1); row++){
temp[0] = w[4*(row-1)+0];
temp[1] = w[4*(row-1)+1];
temp[2] = w[4*(row-1)+2];
temp[3] = w[4*(row-1)+3];
/* 如果i是Nk的倍数，则w[i]=w[i-Nk] XOR SubWord(RotWord(w[i-1])) XOR Rcon[i/Nk] */
if (row % Nk == 0){
/* 接受 4 字节的数组并将它们向左旋转位移 1 位 */
RotWord(temp,result);
/* 把一个4字节的基密钥序列[a0，a1，a2，a3]，左移一个字节变为[a1，a2，a3，a0] */
SubWord(result,result2);
memcpy(temp,result2,4);
/* Rcon[i]表示32比特字符串[xi-1，00，00，00] */
temp[0] = (byte)( (int)temp[0] ^ (int) Rcon[4*(row/Nk)+0] );
temp[1] = (byte)( (int)temp[1] ^ (int) Rcon[4*(row/Nk)+1] );
temp[2] = (byte)( (int)temp[2] ^ (int) Rcon[4*(row/Nk)+2] );
temp[3] = (byte)( (int)temp[3] ^ (int) Rcon[4*(row/Nk)+3] );
}else if ( Nk > 6 && (row % Nk == 4) ){
/* 以后的字w[i]等于它前一个字w[i-1]与前第Nk个字w[i-Nk]的异或，即w[i]=w[i-1] XOR w[i-Nk] */
SubWord(temp,result);
memcpy(temp,result,4);
}
// w[row] = w[row-Nk] xor temp
w[4*row+0] = (byte) ( (int) w[4*(row-Nk)+0] ^ (int)temp[0] );
w[4*row+1] = (byte) ( (int) w[4*(row-Nk)+1] ^ (int)temp[1] );
w[4*row+2] = (byte) ( (int) w[4*(row-Nk)+2] ^ (int)temp[2] );
w[4*row+3] = (byte) ( (int) w[4*(row-Nk)+3] ^ (int)temp[3] );
}
}
/* 1.1: 密钥扩展 位置变换,把一个4字节的基密钥序列[a0，a1，a2，a3]，左移一个字节变为[a1，a2，a3，a0]。 */
void AES::RotWord(unsigned char * word,unsigned char *result)
{
result[0] = word[1];
result[1] = word[2];
result[2] = word[3];
result[3] = word[0];
}
/* 1.2: 密钥扩展位置变换, 对一个4字节的输入字[a0，a1，a2，a3]，每一个字节进行S盒变换 */
void AES::SubWord(unsigned char * word,unsigned char* result)
{
result[0] = Sbox[ 16*(word[0] >> 4)+ (word[0] & 0x0f) ];
result[1] = Sbox[ 16*(word[1] >> 4)+ (word[1] & 0x0f) ];
result[2] = Sbox[ 16*(word[2] >> 4)+ (word[2] & 0x0f) ];
result[3] = Sbox[ 16*(word[3] >> 4)+ (word[3] & 0x0f) ];
}
/* 2: 轮密钥加(Add Round Key) */
void AES::AddRoundKey(int round)
{
int r,c;
for (r = 0; r < 4; r++){
for (c = 0; c < 4; c++){
/* 经过扩展的密钥，根据加密的轮数用相应的扩展密钥的4个数据项和中间状态矩阵上的列进行按位异或 */
State[r][c]=(unsigned char)((int)State[r][c]^(int)w[4*((round*4)+c)+r]);
}
}
}
/* 3.1: 字节替代，从S-Box中找出S[A]=S[x,y]的值，其中A为输入矩阵任一元素。 */
void AES::SubBytes()
{
int r,c;
for (r = 0; r < 4; r++){
for (c = 0; c < 4; c++){
State[r][c] = Sbox[ 16*(State[r][c] >> 4)+ ( State[r][c] & 0x0f) ];
}
}
}
/* 3.2: 逆变换字节替代，将S-Box中的S[x,y]=S[A],其中A为输入矩阵任一元素。 */
void AES::InvSubBytes()
{
int r,c;
for (r = 0; r < 4; r++){
for (c = 0; c < 4; c++){
State[r][c] = iSbox[ 16*( State[r][c] >> 4)+( State[r][c] & 0x0f) ];
}
}
}
/* 4.1: 行移位，第一行维持不变，第二、第三、第四行的每个字节向左循环移位的偏移量分别为1格，2格，3格 */
void AES::ShiftRows()
{
unsigned char temp[4*4];
int r,c;
for (r = 0; r < 4; r++){/* copy State into temp[] */
for (c = 0; c < 4; c++){
temp[4*r+c] = State[r][c];
}
}
for (r = 1; r < 4; r++){/* shift temp into State */
for (c = 0; c < 4; c++){
State[r][c] = temp[ 4*r+ (c + r) % Nb ];
}
}
}
/* 4.2: 逆变换行移位 */
void AES::InvShiftRows()
{
unsigned char temp[4*4];
int r,c;
for (r = 0; r < 4; r++){/* copy State into temp[] */
for (c = 0; c < 4; c++){
temp[4*r+c] = State[r][c];
}
}
for (r = 1; r < 4; r++){
for (c = 0; c < 4; c++){/* shift temp into State */
State[r][ (c + r) % Nb ] = temp[4*r+c];
}
}
}
/* 5.1: 列混淆 */
void AES::MixColumns()
{
unsigned char temp[4*4];
int r,c;
for (r = 0; r < 4; r++){
for (c = 0; c < 4; c++){
temp[4*r+c] = State[r][c];
}
}
for (c = 0; c < 4; c++){
State[0][c] = (unsigned char) ( (int)gfmultby02(temp[0+c]) ^ (int)gfmultby03(temp[4*1+c]) ^
(int)gfmultby01(temp[4*2+c]) ^ (int)gfmultby01(temp[4*3+c]) );
State[1][c] = (unsigned char) ( (int)gfmultby01(temp[0+c]) ^ (int)gfmultby02(temp[4*1+c]) ^
(int)gfmultby03(temp[4*2+c]) ^ (int)gfmultby01(temp[4*3+c]) );
State[2][c] = (unsigned char) ( (int)gfmultby01(temp[0+c]) ^ (int)gfmultby01(temp[4*1+c]) ^
(int)gfmultby02(temp[4*2+c]) ^ (int)gfmultby03(temp[4*3+c]) );
State[3][c] = (unsigned char) ( (int)gfmultby03(temp[0+c]) ^ (int)gfmultby01(temp[4*1+c]) ^
(int)gfmultby01(temp[4*2+c]) ^ (int)gfmultby02(temp[4*3+c]) );
}
}
/* 5.2: 逆变换列混淆 */
void AES::InvMixColumns()
{
unsigned char temp[4*4];
int r,c;
for (r = 0; r < 4; r++) // copy State into temp[]
{
for (c = 0; c < 4; c++)
{
temp[4*r+c] = State[r][c];
}
}
for (c = 0; c < 4; c++)
{
State[0][c] = (unsigned char) ( (int)gfmultby0e(temp[c]) ^ (int)gfmultby0b(temp[4+c]) ^
(int)gfmultby0d(temp[4*2+c]) ^ (int)gfmultby09(temp[4*3+c]) );
State[1][c] = (unsigned char) ( (int)gfmultby09(temp[c]) ^ (int)gfmultby0e(temp[4+c]) ^
(int)gfmultby0b(temp[4*2+c]) ^ (int)gfmultby0d(temp[4*3+c]) );
State[2][c] = (unsigned char) ( (int)gfmultby0d(temp[c]) ^ (int)gfmultby09(temp[4+c]) ^
(int)gfmultby0e(temp[4*2+c]) ^ (int)gfmultby0b(temp[4*3+c]) );
State[3][c] = (unsigned char) ( (int)gfmultby0b(temp[c]) ^ (int)gfmultby0d(temp[4+c]) ^
(int)gfmultby09(temp[4*2+c]) ^ (int)gfmultby0e(temp[4*3+c]) );
}
}
/* 5.3: 列混淆互换操作 */
unsigned char AES::gfmultby01(unsigned char b)
{
return b;
}
unsigned char AES::gfmultby02(unsigned char b)
{
if (b < 0x80)
return (unsigned char)(int)(b <<1);
else
return (unsigned char)( (int)(b << 1) ^ (int)(0x1b) );
}
unsigned char AES::gfmultby03(unsigned char b)
{
return (unsigned char) ( (int)gfmultby02(b) ^ (int)b );
}
unsigned char AES::gfmultby09(unsigned char b)
{
return (unsigned char)( (int)gfmultby02(gfmultby02(gfmultby02(b))) ^
(int)b );
}
unsigned char AES::gfmultby0b(unsigned char b)
{
return (unsigned char)( (int)gfmultby02(gfmultby02(gfmultby02(b))) ^
(int)gfmultby02(b) ^
(int)b );
}
unsigned char AES::gfmultby0d(unsigned char b)
{
return (unsigned char)( (int)gfmultby02(gfmultby02(gfmultby02(b))) ^
(int)gfmultby02(gfmultby02(b)) ^
(int)(b) );
}
unsigned char AES::gfmultby0e(unsigned char b)
{
return (unsigned char)( (int)gfmultby02(gfmultby02(gfmultby02(b))) ^
(int)gfmultby02(gfmultby02(b)) ^
(int)gfmultby02(b) );
}
void AES::Cipher(unsigned char* input, unsigned char* output)
{
int i;
/* 清空存放输入数组 */
memset(&State[0][0],0,16);
/* 将输入的明文按照列顺序组合4x4的矩阵 */
for (i = 0; i < (4 * Nb); i++){
State[i % 4][ i / 4] = input[i];
}
/* 直接与第0组密钥W[0,3](即基密钥Key)进行异或，作为轮加密的输入 */
AddRoundKey(0);
/* 循环进行字节替代、行位移、列混淆、轮密钥加运算 */
for (int round = 1; round <= (Nr - 1); round++){
SubBytes();
ShiftRows();
MixColumns();
AddRoundKey(round);
}
/* 最后一轮运算不进行列混淆变换 */
SubBytes();
ShiftRows();
AddRoundKey(Nr);
/* 最后，输出128位的密文比特流 */
for (i = 0; i < (4 * Nb); i++){
output[i] = State[i % 4][ i / 4];
}
}
void AES::InvCipher(unsigned char * input, unsigned char * output)
{
int i;
/* 清空存放输入数组 */
memset(&State[0][0],0,16);
/* 将输入的明文按照列顺序组合4x4的矩阵 */
for (i = 0; i < (4 * Nb); i++){
State[i % 4][ i / 4] = input[i];
}
/* 最后一轮运直接进行异或 */
AddRoundKey(Nr);
/* 循环进行行位移、字节替代、轮密钥加运算、 列混淆*/
for (int round = Nr-1; round >= 1; round--){
InvShiftRows();
InvSubBytes();
AddRoundKey(round);
InvMixColumns();
}
InvShiftRows();
InvSubBytes();
AddRoundKey(0);
/* 最后，输出解密的128位的密文比特流 */
for (i = 0; i < (4 * Nb); i++){
output[i] = State[i % 4][ i / 4];
}
}