304 lines
10 KiB
C++
304 lines
10 KiB
C++
#include"AES_HPP.hpp"
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unsigned char S_BOX[256] =
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{
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0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76,
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0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0,
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0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15,
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0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75,
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0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84,
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0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF,
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0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8,
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0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2,
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0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73,
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0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB,
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0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79,
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0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08,
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0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A,
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0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E,
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0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF,
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0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16
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};
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unsigned char INV_S_BOX[256] =
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{
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0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0xA3, 0x9E, 0x81, 0xF3, 0xD7, 0xFB,
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0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87, 0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, 0xCB,
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0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D, 0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E,
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0x08, 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2, 0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25,
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0x72, 0xF8, 0xF6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xD4, 0xA4, 0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92,
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0x6C, 0x70, 0x48, 0x50, 0xFD, 0xED, 0xB9, 0xDA, 0x5E, 0x15, 0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84,
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0x90, 0xD8, 0xAB, 0x00, 0x8C, 0xBC, 0xD3, 0x0A, 0xF7, 0xE4, 0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06,
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0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02, 0xC1, 0xAF, 0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B,
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0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA, 0x97, 0xF2, 0xCF, 0xCE, 0xF0, 0xB4, 0xE6, 0x73,
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0x96, 0xAC, 0x74, 0x22, 0xE7, 0xAD, 0x35, 0x85, 0xE2, 0xF9, 0x37, 0xE8, 0x1C, 0x75, 0xDF, 0x6E,
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0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89, 0x6F, 0xB7, 0x62, 0x0E, 0xAA, 0x18, 0xBE, 0x1B,
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0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20, 0x9A, 0xDB, 0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4,
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0x1F, 0xDD, 0xA8, 0x33, 0x88, 0x07, 0xC7, 0x31, 0xB1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F,
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0x60, 0x51, 0x7F, 0xA9, 0x19, 0xB5, 0x4A, 0x0D, 0x2D, 0xE5, 0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF,
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0xA0, 0xE0, 0x3B, 0x4D, 0xAE, 0x2A, 0xF5, 0xB0, 0xC8, 0xEB, 0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61,
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0x17, 0x2B, 0x04, 0x7E, 0xBA, 0x77, 0xD6, 0x26, 0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D
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};
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unsigned char RCON[11] = { 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36 };
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unsigned char Mix[4][4] = {
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0x02, 0x03, 0x01, 0x01,
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0x01, 0x02, 0x03, 0x01,
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0x01, 0x01, 0x02, 0x03,
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0x03, 0x01, 0x01, 0x02
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};
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unsigned char InvMix[4][4] = {
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0x0E, 0x0B, 0x0D, 0x09,
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0x09, 0x0E, 0x0B, 0x0D,
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0x0D, 0x09, 0x0E, 0x0B,
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0x0B, 0x0D, 0x09, 0x0E
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};
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void KeyScheduleCore(unsigned char roundNumber, const unsigned char KeyIn[4], unsigned char KeyOut[4]) {
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memcpy(KeyOut, KeyIn, sizeof(KeyIn));
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unsigned char tmp = KeyOut[0];
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for (int i = 0; i < 3; i++) {
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KeyOut[i] = KeyOut[i + 1];
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}
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KeyOut[3] = tmp;
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for (int i = 0; i < 4; i++) {
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KeyOut[i] = S_BOX[KeyOut[i]];
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}
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KeyOut[0] = KeyOut[0] ^ RCON[roundNumber];
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}
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void KeyExpansion(const unsigned char* key, unsigned char* ExpandKey) {
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int KeyLength = 16;
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int ExpandKeyLength = 176;
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int Pre = 16;//to previous round key
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//int m = 0;
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//this four value is depanding on the size of the key. Now it is 128bit
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for (int i = 0; i < 16; i++) {
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ExpandKey[i] = key[i];
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}
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for (int i = KeyLength, rconIt = 1; i < ExpandKeyLength; rconIt++) {
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unsigned char tmp[4];
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memcpy(tmp, ExpandKey + i - 4, 4);
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unsigned char g[4];
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KeyScheduleCore(rconIt, tmp, g);
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memcpy(tmp, ExpandKey + i - Pre, 4);
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for (int j = 0; j < 4; j++) {
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tmp[j] ^= g[j];
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}
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memcpy(ExpandKey + i, tmp, 4);
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i += 4;
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for (int j = 0; j < 3; j++) {
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memcpy(tmp, ExpandKey + i - 4, 4);
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for (int k = 0; k < 4; k++) {
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ExpandKey[i + k] = tmp[k] ^ ExpandKey[i - Pre + k];
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}
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i += 4;
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}
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//如要支援其他大小的密鑰，還有其他東西要寫
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}
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}
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void AddRoundKey(unsigned char state[4][4], const unsigned char RoundKey[4][4]) {
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for (int i = 0; i < 4; i++) {
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for (int j = 0; j < 4; j++) {
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state[i][j] ^= RoundKey[i][j];
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}
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}
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}
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void SubBytes(unsigned char state[4][4]) {
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for (int i = 0; i < 4; i++) {
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for (int j = 0; j < 4; j++) {
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state[i][j] = S_BOX[state[i][j]];
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}
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}
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}
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void ShiftRows(unsigned char state[4][4]) {//只有16個所以也可以直接寫對應
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for (int i = 1; i <= 3; i++) {
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unsigned char row[4];
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for (int j = 0; j < 4; j++) {
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row[j] = state[i][j];
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}
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for (int j = 0; j < 4; j++) {
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state[i][(j - i + 4) % 4] = row[j];
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}
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}
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}
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void MixColumns(unsigned char state[4][4]) {
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unsigned char tmp[4][4];
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for (int i = 0; i < 4; i++) {
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for (int j = 0; j < 4; j++) {
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tmp[i][j] = state[i][j];
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}
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}
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for (int i = 0; i < 4; i++) {
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for (int j = 0; j < 4; j++) {
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//乘換成擴展域的乘法，加換成擴展域的加法(XOR)
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state[i][j] = G_Multi(Mix[i][0], tmp[0][j]) ^ G_Multi(Mix[i][1], tmp[1][j]) ^ G_Multi(Mix[i][2], tmp[2][j]) ^ G_Multi(Mix[i][3], tmp[3][j]);
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}
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}
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}
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void InvSubBytes(unsigned char state[4][4]) {
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for (int i = 0; i < 4; i++) {
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for (int j = 0; j < 4; j++) {
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state[i][j] = INV_S_BOX[state[i][j]];
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}
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}
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}
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void InvShiftRows(unsigned char state[4][4]) {
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for (int i = 1; i <= 3; i++) {
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unsigned char row[4];
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for (int j = 0; j < 4; j++) {
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row[j] = state[i][j];
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}
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for (int j = 0; j < 4; j++) {
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state[i][(i + j) % 4] = row[j];
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}
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}
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}
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void InvMixColumns(unsigned char state[4][4]) {
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unsigned char tmp[4][4];
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for (int i = 0; i < 4; i++) {
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for (int j = 0; j < 4; j++) {
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tmp[i][j] = state[i][j];
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}
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}
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for (int i = 0; i < 4; i++) {
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for (int j = 0; j < 4; j++) {
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//乘換成擴展域的乘法，加換成擴展域的加法(XOR)
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state[i][j] = G_Multi(InvMix[i][0], tmp[0][j]) ^ G_Multi(InvMix[i][1], tmp[1][j]) ^ G_Multi(InvMix[i][2], tmp[2][j]) ^ G_Multi(InvMix[i][3], tmp[3][j]);
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}
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}
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}
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unsigned char G_Multi(unsigned char a, unsigned char b) {
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unsigned char result = 0;
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for (int i = 0; i < 8; i++) {
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if (a & 1) {
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result ^= b;
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}
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bool IshHighBit1 = b & 0x80;
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b <<= 1;//模擬乘上x(因為下次和a的高一次方運算)
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if (IshHighBit1) {
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b ^= 0x1B;//模擬除以(x^8 + x^4 + x^3 + x^1 + 1)，剛剛左移丟失的高位也剛好被除掉
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}
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a >>= 1;//將高一次方移到第一位
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}
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return result;
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}
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void encrypt(unsigned char* plaintext, unsigned char* key, unsigned char* output) {
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unsigned char state[4][4];
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//錯的->memcpy(state, plaintext, sizeof(plaintext));
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for (int i = 0; i < 4; i++) {
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for (int j = 0; j < 4; j++) {
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state[i][j] = plaintext[i + j * 4];
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}
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}
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constexpr int ExpandKeyLength = 176;//44*4
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int RoundNums = 10;
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//取決於密鑰大小
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unsigned char ExpandKey[ExpandKeyLength];
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KeyExpansion(key, ExpandKey);
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unsigned char RoundKey[4][4];
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for (int i = 0; i < 4; i++) {
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for (int j = 0; j < 4; j++) {
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RoundKey[i][j] = ExpandKey[j * 4 + i];
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}
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}
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AddRoundKey(state, RoundKey);
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for (int i = 1; i <= RoundNums; i++) {
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for (int j = 0; j < 4; j++) {
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for (int k = 0; k < 4; k++) {
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RoundKey[j][k] = ExpandKey[i * 16 + k * 4 + j];
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}
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}
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SubBytes(state);
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ShiftRows(state);
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if (i < RoundNums) {//最後一輪不用MixColunm
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MixColumns(state);
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}
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AddRoundKey(state, RoundKey);
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}
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for (int i = 0; i < 4; i++) {
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for (int j = 0; j < 4; j++) {
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output[j * 4 + i] = state[i][j];
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}
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}
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return;
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}
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void decrypt(unsigned char* ciphertext, unsigned char* key, unsigned char* output) {
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unsigned char state[4][4];
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//錯的->memcpy(state, ciphertext, sizeof(ciphertext));
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for (int i = 0; i < 4; i++) {
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for (int j = 0; j < 4; j++) {
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state[i][j] = ciphertext[i + j * 4];
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}
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}
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constexpr int ExpandKeyLength = 176;//44*4
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int RoundNums = 10;
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//取決於密鑰大小
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unsigned char ExpandKey[ExpandKeyLength];
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KeyExpansion(key, ExpandKey);
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unsigned char RoundKey[4][4];
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for (int i = RoundNums; i >= 1; i--) {
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for (int j = 0; j < 4; j++) {
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for (int k = 0; k < 4; k++) {
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RoundKey[j][k] = ExpandKey[i * 16 + k * 4 + j];
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}
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}
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AddRoundKey(state, RoundKey);
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if (i < RoundNums) {
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InvMixColumns(state);
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}
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InvShiftRows(state);
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InvSubBytes(state);
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}
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for (int i = 0; i < 4; i++) {
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for (int j = 0; j < 4; j++) {
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RoundKey[i][j] = ExpandKey[j * 4 + i];
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}
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}
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AddRoundKey(state, RoundKey);
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for (int i = 0; i < 4; i++) {
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for (int j = 0; j < 4; j++) {
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output[j * 4 + i] = state[i][j];
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}
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}
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} |