AES加密解密算法推荐文档

集美大学计算机工程学院实验报告：：实验成绩班级课程名称：姓名指导教师：：学号实验项目名称：AES加密解密算法：：上机实践日期学时组号：2上机实践时间实验项目编号：：一、实验目的学习AES加密的方法。

二、实验内容与设计思想编写AES加密解密算法，并测试。

三、实验使用环境操作系统：Microsoft Windows 7编程环境：Visual C++ 6.0四、实验步骤和调试过程// AES.h#ifndef AES_H_#define AES_H_#include <bitset>#include <utility>using namespace std;class AES{public:typedef unsigned char byte;static const int KEY_SIZE = 16; // 密钥长度为位static const int N_ROUND = 11;明文 byte plainText[16]; //当前分组。

byte state[16]; //byte cipherKey[16]; // 密钥 byte roundKey[N_ROUND][16]; //轮密钥密文 byte cipherText[16]; // byte SBox[16][16];// S盒盒逆 byte InvSBox[16][16]; // S void EncryptionProcess();void DecryptionProcess();void Round(const int& round);void InvRound(const int& round);void FinalRound();void InvFinalRound();void KeyExpansion();void AddRoundKey(const int& round);void SubBytes();void InvSubBytes();void ShiftRows();void InvShiftRows();void MixColumns();void InvMixColumns();void BuildSBox();void BuildInvSBox();void InitialState(const byte* text);void InitialCipherText();void InitialplainText();byte GFMultplyByte(const byte& left, const byte& right);const byte* GFMultplyBytesMatrix(const byte* left, const byte* right);public:AES();const byte* Cipher(const byte* text, const byte* key, const int& keySize);const byte* InvCipher(const byte* text, const byte* key, const int& keySize);};void AES::EncryptionProcess(){ // 加密过程InitialState(plainText);KeyExpansion(); // 密钥扩展AddRoundKey(0); // 轮密钥加for(int i = 1; i < N_ROUND-1; ++i){Round(i);}FinalRound();InitialCipherText();}void AES::DecryptionProcess(){ // 解密过程InitialState(cipherText);KeyExpansion();InvFinalRound();for(int i = N_ROUND-2; i > 0 ; --i){InvRound(i);}AddRoundKey(0);InitialplainText();}void AES::Round(const int& round) { // 正常轮SubBytes();ShiftRows();MixColumns();AddRoundKey(round);}void AES::InvRound(const int& round) { // 正常轮的逆AddRoundKey(round);InvMixColumns();InvShiftRows();InvSubBytes();}void AES::FinalRound(){ // 最后轮SubBytes();ShiftRows();AddRoundKey(N_ROUND - 1);}void AES::InvFinalRound(){ // 最后轮的逆AddRoundKey(N_ROUND - 1); InvShiftRows();InvSubBytes();}void AES::KeyExpansion(){ // 密钥扩展const byte rcon[N_ROUND][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} };for(int i = 0; i < 16; ++i){roundKey[0][i] = cipherKey[i];}for(int i = 0; i < 4; ++i){ // roundKey[0][16]为cipherKey的转置矩阵for(int j = 0; j < 4; ++j){roundKey[0][4*i + j] = cipherKey[4*j + i];}}for(int roundIndex = 1; roundIndex < N_ROUND; ++roundIndex) {byte rotWord[4] = {0x00};rotWord[0] = roundKey[roundIndex - 1][3];rotWord[1] = roundKey[roundIndex - 1][7];rotWord[2] = roundKey[roundIndex - 1][11];rotWord[3] = roundKey[roundIndex - 1][15];std::swap<byte>(rotWord[0], rotWord[1]);std::swap<byte>(rotWord[1], rotWord[2]);std::swap<byte>(rotWord[2], rotWord[3]);for(int i = 0; i < 4; ++i){rotWord[i] = SBox[ rotWord[i] >> 4][ rotWord[i] & 0x0f ]; roundKey[roundIndex][4*i] = roundKey[roundIndex -1][4*i] ^rotWord[i] ^ rcon[roundIndex][i];}for(int j = 1; j < 4; ++j){for(int i = 0; i < 4; ++i){roundKey[roundIndex][4*i + j] = roundKey[roundIndex - 1][4*i+ j] ^ roundKey[roundIndex][4*i + j - 1];}}}}void AES::AddRoundKey(const int& round){ // 轮密钥加for(int i = 0; i < 16; ++i){ // 利用当前分组state和第round组扩展密钥进行按位异或 state[i] ^= roundKey[round][i];}}void AES::SubBytes(){ // 字节代换for(int i = 0; i < 16; ++i){state[i] = SBox[ state[i] >> 4][ state[i] & 0x0f ];}}void AES::InvSubBytes(){ // 逆字节代换for(int i = 0; i < 16; ++i){state[i] = InvSBox[ state[i] >> 4][ state[i] & 0x0f ]; }}void AES::ShiftRows(){ // 行变换//state第一行保持不变// Do nothing.//state第二行循环左移一个字节std::swap<byte>(state[4], state[5]);std::swap<byte>(state[5], state[6]);std::swap<byte>(state[6], state[7]);//state第三行循环左移两个字节std::swap<byte>(state[8], state[10]);std::swap<byte>(state[9], state[11]);//state第三行循环左移三个字节std::swap<byte>(state[14], state[15]);std::swap<byte>(state[13], state[14]);std::swap<byte>(state[12], state[13]);}void AES::InvShiftRows(){ // 行变换反演//state第一行保持不变// Do nothing.//state第二行循环右移一个字节std::swap<byte>(state[6], state[7]);std::swap<byte>(state[5], state[6]);std::swap<byte>(state[4], state[5]);//state第三行循环右移两个字节std::swap<byte>(state[9], state[11]);std::swap<byte>(state[8], state[10]);//state第三行循环右移三个字节std::swap<byte>(state[12], state[13]);std::swap<byte>(state[13], state[14]);std::swap<byte>(state[14], state[15]);}void AES::MixColumns(){ // 列混淆byte matrix[4][4] = {{0x02, 0x03, 0x01, 0x01},{0x01, 0x02, 0x03, 0x01},{0x01, 0x01, 0x02, 0x03},{0x03, 0x01, 0x01, 0x02}};const byte* temp = GFMultplyBytesMatrix((byte*)matrix, state); for(int i = 0; i < 16; ++i){state[i] = temp[i];}delete[] temp;}void AES::InvMixColumns(){ // 列混淆反演byte matrix[4][4] = {{0x0e, 0x0b, 0x0d, 0x09},{0x09, 0x0e, 0x0b, 0x0d},{0x0d, 0x09, 0x0e, 0x0b},{0x0b, 0x0d, 0x09, 0x0e} };const byte* temp = GFMultplyBytesMatrix((byte*)matrix, state); for(int i = 0; i < 16; ++i){state[i] = temp[i];}delete[] temp;}void AES::BuildSBox(){ // 构建S盒byte box[16][16] ={/* 0 1 2 3 4 5 6 7 89 ab 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, 0xe8,0x1f, 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}};for(int i = 0; i < 16; ++i){for(int j = 0; j < 16; ++j){SBox[i][j] = box[i][j];}}}void AES::BuildInvSBox()盒S构建逆{ //byte box[16][16] ={/* 0 1 2 3 4 5 6 7 89 ab 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,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}};for(int i = 0; i < 16; ++i){for(int j = 0; j < 16; ++j){InvSBox[i][j] = box[i][j];}}}void AES::InitialState(const byte* text){ // state初始时候为明(密)文矩阵的转置矩阵for(int i = 0; i < 4; ++i){ //转置text存放在state中for(int j = 0; j < 4; ++j){state[4*i + j] = text[4*j + i];}}}void AES::InitialCipherText(){ // state被复制到输出矩阵中for(int i = 0; i < 4; ++i){ //转置state存放在cipherText中for(int j = 0; j < 4; ++j){cipherText[4*i + j] = state[4*j + i];}}}void AES::InitialplainText(){ // state被复制到输入矩阵中for(int i = 0; i < 4; ++i){ //转置state存放在plainText中for(int j = 0; j < 4; ++j){plainText[4*i + j] = state[4*j + i];}}}AES::byte AES::GFMultplyByte(const byte& left, const byte& right) { //有限域GF(2^8)上的乘法byte temp[8];bitset<8> bits((unsigned long)right); //把right化为个二进制位存放在bits中temp[0] = left;for(int i = 1; i < 8; ++i){if(temp[i-1] >= 0x80) //若(temp[i-1] 首位为{temp[i] = temp[i-1] << 1;异或(00011011)与 temp[i] = temp[i] ^ 0x1b; //}else{temp[i] = temp[i-1] << 1;}}byte result = 0x00;for(int i = 0; i < 8; ++i){if(bits[i] == 1){result ^= temp[i];}}return result;}const AES::byte* AES::GFMultplyBytesMatrix(const byte* left, const byte* right){ //有限域GF(2^8)上的矩阵(4*4)乘法AES::byte* result = new AES::byte[16];for(int i = 0; i < 4; ++i){for(int j = 0; j < 4; ++j){result[4*i + j] = GFMultplyByte(left[4*i], right[j]);for(int k = 1; k < 4; ++k){result[4*i + j] ^= GFMultplyByte(left[4*i + k],right[4*k + j]);}}}return result;}AES::AES(){BuildSBox();BuildInvSBox();}const AES::byte* AES::Cipher(const byte* text, const byte* key, const int&keySize){ // 用key给text加密for(int i = 0; i < 16; ++i){plainText[i] = text[i];}for(int i = 0; i < keySize; ++i){cipherKey[i] = key[i];}EncryptionProcess();return cipherText;}const AES::byte* AES::InvCipher(const byte* text, const byte* key, const int&keySize){ // 用key给text解密for(int i = 0; i < 16; ++i){cipherText[i] = text[i];}for(int i = 0; i < keySize; ++i){cipherKey[i] = key[i];}DecryptionProcess();return plainText;}#endif /* AES_H_ *///AES.CPP// main.cpp#include stdafx.h#include <string>#include <fstream>#include <iostream>#include AES.husing namespace std;int main(int argc, char* argv[]){const string USAGE = Usage: AES [-E | -D] destinationfile sourcefilekeyfile ;if(argc != 5){cout << USAGE << endl;return 1;}ifstream is(argv[3], ios::in | ios::binary);if(!is){cerr << InputFileNotFoundException << endl;return 2;}ifstream ks(argv[4], ios::in | ios::binary);if(!ks){cerr << KeyFileNotFoundException << endl;return 2;}AES aes;const unsigned char *key = new unsigned char[16];ks.read((char*)key, 16);ofstream os(argv[2], ios::out | ios::binary);if(strcmp(argv[1], -E) == 0 || strcmp(argv[1], -e) == 0){const unsigned char* cipherText;const unsigned char* plainText = new unsigned char[16]; while(is.read((char*)plainText, 16)){cipherText = aes.Cipher(plainText, key, 16);os.write((const char*)cipherText, 16);}}if(strcmp(argv[1], -D) == 0 || strcmp(argv[1], -d) == 0){const unsigned char* plainText;const unsigned char* cipherText = new unsigned char[16]; while(is.read((char *)cipherText, 16)){plainText = aes.InvCipher(cipherText, key, 16);os.write((const char*)plainText, 16);}delete[] cipherText;}delete[] key;is.close();ks.close();os.close();return 0;}五、实验小结六、附录《现代密码学教程》。