AES加密算法实验报告

四川大学计算机学院、软件学院实验报告学号：：专业：班级：第10 周在程序运行读取需要加密的图片时，需要进行图片的选取，本次实验中使用在弹窗中选取文件的方式，使用头文件commdlg.h来实现在文件夹中选择需要的文件的选取。

三、加密算法流程AES加密算法流程如下字节代替：用一个S盒完成分组的字节到字节的代替；行移位：进行一次行上的置换；列混合：利用有限域GF(28)上的运算特性的一个代替；轮密钥加：当前分组和扩展密钥的一部分进行按位异或。

四、代码实现cryptograph.h#include<string>#include<iostream>class plaintext{public:plaintext();static void createplaintext(unsigned char a[]);static void SubBytes(unsigned char p[16]);static void inSubBytes(unsigned char p[16]);static void ShiftRows(unsigned char e[]);static void inShiftRows(unsigned char e[]);static void MatrixToByte(unsigned char e[]);static void inMatrixToByte(unsigned char e[]);static unsigned char FFmul(unsigned char a, unsigned char b);static void KeyAdding(unsigned char state[16], unsigned char k[][4]);static void KeyExpansion(unsigned char* key, unsigned char w[][4][4]);~plaintext();private:};cryptograph.cpp#include"cryptography.h"using namespace std;static unsigned char sBox[] = {};/定义加密S盒/unsigned char insBox[256] ={};//定义解密S盒plaintext::plaintext(){}void plaintext::createplaintext(unsigned char a[])//创建明文{int i = 0;unsigned int p[16];for (int j = 0; j<200; j++){if (a[j] == 0){break;}}for (; i<16; i++){p[i] = a[i];a[i] = a[i + 16];}}void plaintext::SubBytes(unsigned char p[16])//字节变换函数{unsigned char b[16];for (int i = 0; i<16; i++){b[i] = sBox[(int)p[i]];}}void plaintext::inSubBytes(unsigned char p[16])//逆字节变换函数{unsigned char b[16];for (int i = 0; i<16; i++){b[i] = insBox[(int)p[i]];}}void plaintext::ShiftRows(unsigned char e[])//行移位变换函数{unsigned char t[4];for (int i = 1; i<4; i++){for (int x = 0; x<4; x++)t[x] = e[x + i * 4];for (int y = 0; y<4; y++)e[(y + 4 - i) % 4 + i * 4] = t[y];}}void plaintext::inShiftRows(unsigned char e[])//逆行移位变换函数{unsigned char t[4];for (int i = 1; i<4; i++){for (int x = 0; x<4; x++)t[x] = e[x + i * 4];for (int y = 0; y<4; y++)e[(y + i) % 4 + i * 4] = t[y];}}void plaintext::MatrixToByte(unsigned char e[])//列混合变换函数{unsigned char t[4];int r, c;for (c = 0; c< 4; c++){for (r = 0; r<4; r++){t[r] = e[r * 4 + c];}for (r = 0; r<4; r++){e[r * 4 + c] = FFmul(0x02, t[r])^ FFmul(0x03, t[(r + 1) % 4])^ FFmul(0x01, t[(r + 2) % 4])^ FFmul(0x01, t[(r + 3) % 4]);}}}void plaintext::inMatrixToByte(unsigned char e[])//逆列混合变换函数{unsigned char t[4];int r, c;for (c = 0; c< 4; c++){for (r = 0; r<4; r++){t[r] = e[r * 4 + c];}for (r = 0; r<4; r++){e[r * 4 + c] = FFmul(0x0e, t[r])^ FFmul(0x0b, t[(r + 1) % 4])^ FFmul(0x0d, t[(r + 2) % 4])^ FFmul(0x09, t[(r + 3) % 4]);}}}unsigned char plaintext::FFmul(unsigned char a, unsigned char b) {unsigned char bw[4];unsigned char res = 0;int i;bw[0] = b;for (i = 1; i<4; i++){bw[i] = bw[i - 1] << 1;if (bw[i - 1] & 0x80){bw[i] ^= 0x1b;}}for (i = 0; i<4; i++){if ((a >> i) & 0x01){res ^= bw[i];}}return res;}void plaintext::KeyAdding(unsigned char state[16], unsigned char k[][4])//轮密钥加{int r, c;for (c = 0; c<4; c++){for (r = 0; r<4; r++){state[r + c * 4] ^= k[r][c];}}}void plaintext::KeyExpansion(unsigned char* key, unsigned char w[][4][4])//密钥扩展{int i, j, r, c;unsigned char rc[] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36 };for (r = 0; r<4; r++){for (c = 0; c<4; c++){w[0][r][c] = key[r + c * 4];}}for (i = 1; i <= 10; i++){for (j = 0; j<4; j++){unsigned char t[4];for (r = 0; r<4; r++){t[r] = j ? w[i][r][j - 1] : w[i - 1][r][3];}if (j == 0){unsigned char temp = t[0];for (r = 0; r<3; r++){t[r] = sBox[t[(r + 1) % 4]];}t[3] = sBox[temp];t[0] ^= rc[i - 1];}for (r = 0; r<4; r++){w[i][r][j] = w[i - 1][r][j] ^ t[r];}}}}plaintext::~plaintext(){}main.cpp#include<iostream>#include<atlimage.h>#include<commdlg.h>//使用文件选取功能#include"cryptography.h"using namespace std;unsigned char w[11][4][4] = { 0 };int len = 0;//图片每行需要加密的长度void Cipher();//加密图片void inCipher();//解密图片void Cipher(unsigned char a[]){unsigned char b[16];for (int i = 0; i < (len / 16); i++){for (int j = 0; j<16; j++)b[j] = a[j + i * 16];plaintext::KeyAdding(b, w[0]);for (int n = 1; n <= 10; n++){plaintext::SubBytes(b);plaintext::ShiftRows(b);if (n != 10)plaintext::MatrixToByte(b);plaintext::KeyAdding(b, w[n]);}for (int m = 0; m<16; m++)a[m + i * 16] = b[m];}}void inCipher(unsigned char a[]){unsigned char b[16];for (int i = 0; i < (len / 16) ; i++){for (int j = 0; j<16; j++){b[j] = a[j + i * 16];}plaintext::KeyAdding(b, w[10]);for (int n = 9; n >= 0; n--){plaintext::inShiftRows(b);plaintext::inSubBytes(b);plaintext::KeyAdding(b, w[n]);if (n)plaintext::inMatrixToByte(b);}for (int m = 0; m<16; m++)a[m + i * 16] = b[m];}}bool ImageCopy(const CImage &srcImage, CImage &destImage) {int i, j;//循环变量if (srcImage.IsNull())return FALSE;//源图像参数BYTE* srcPtr = (BYTE*)srcImage.GetBits();int srcBitsCount = srcImage.GetBPP();int srcWidth = srcImage.GetWidth();int srcHeight = srcImage.GetHeight();int srcPitch = srcImage.GetPitch();//销毁原有图像if (!destImage.IsNull()){destImage.Destroy();}//创建新图像if (srcBitsCount == 32) //支持alpha通道{destImage.Create(srcWidth, srcHeight, srcBitsCount, 1);}else{destImage.Create(srcWidth, srcHeight, srcBitsCount, 0);}BYTE *destPtr = (BYTE*)destImage.GetBits();int destPitch = destImage.GetPitch();len=abs(srcPitch);for (int i = 0; i<srcHeight; i++)Cipher(srcPtr + i*srcPitch);//复制图像数据for (i = 0; i<srcHeight; i++){memcpy(destPtr + i*destPitch, srcPtr + i*srcPitch, abs(srcPitch));}return TRUE;}bool inImageCopy(const CImage &srcImage, CImage &destImage){int i, j;//循环变量if (srcImage.IsNull())return FALSE;//源图像参数BYTE* srcPtr = (BYTE*)srcImage.GetBits();int srcBitsCount = srcImage.GetBPP();int srcWidth = srcImage.GetWidth();int srcHeight = srcImage.GetHeight();int srcPitch = srcImage.GetPitch();//销毁原有图像if (!destImage.IsNull()){destImage.Destroy();}//创建新图像if (srcBitsCount == 32) //支持alpha通道{destImage.Create(srcWidth, srcHeight, srcBitsCount, 1);}else{destImage.Create(srcWidth, srcHeight, srcBitsCount, 0);}BYTE *destPtr = (BYTE*)destImage.GetBits();int destPitch = destImage.GetPitch();len = abs(srcPitch);for (int i = 0; i<srcHeight; i++)inCipher(srcPtr + i*srcPitch);//复制图像数据for (i = 0; i<srcHeight; i++){memcpy(destPtr + i*destPitch, srcPtr + i*srcPitch, abs(srcPitch));}return TRUE;}int main(){unsigned char key[16] = {//固定密钥0x77, 0x59, 0xc5, 0xa4,0x55, 0x90, 0xa4, 0xa3,0xb2, 0xcc, 0x01, 0xa9,0xcb, 0xac, 0x77, 0x23 };plaintext::KeyExpansion(key, w);TCHAR szBuffer[MAX_PATH] = { 0 };//使用文件选取功能OPENFILENAME ofn = { 0 };ofn.lStructSize = sizeof(ofn);//ofn.hwndOwner = m_hWnd;ofn.lpstrFilter = _T("");//要选择的文件后缀ofn.lpstrInitialDir = _T("D:\\");//默认的文件路径ofn.lpstrFile = szBuffer;//存放文件的缓冲区ofn.nMaxFile = sizeof(szBuffer) / sizeof(*szBuffer);ofn.nFilterIndex = 0;ofn.Flags = OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST | OFN_EXPLORER;//标志如果是多选要加上OFN_ALLOWMULTISELECTBOOL bSel = GetOpenFileName(&ofn);CImage image, image2, image3;//读取图片image.Load(szBuffer);ImageCopy(image, image2);image2.Save("e:/encryption.jpg");inImageCopy(image2, image3);image3.Save("e:/reencryption.jpg");system("pause");}运行程序，出现选择图片界面本数据记录和计算加密结束原图片加密图片解密图片结论（结果）根据结果显示，程序成功的实现了对图片的加密，得到的加密后的结果仍然为图片，并成功地的解密得到了正确的解密后的图片。