AES加密算法实验报告

1、精选优质文档-倾情为你奉上四 川 大 学 计 算 机 学 院、软 件 学 院实 验 报 告 学号：姓名：专业： 班级： 第 10 周课程名称 密码学与网络安全实验课时2实验项目AES加密算法实验时间2015.5.7实验目的 完成AES加密算法，实现图片加密与解密，并将加密后的结果以图片格式保存。实验环境 PC机，Windows7操作系统，Visual C+ 6.0实验内容（算法、程序、步骤和方法） 一、 简介美国国家标准技术研究所在2001年发布了高级加密标准（AES）。AES是一个对称加密算法，旨在取代DES成为广泛使用的标准。AES中的所有运算都是在8为的字节上运行的。特别饿，加减乘除算术

2、都是在有限域GF(28)上运行的。二、 程序特点本次试验中要求对图片进行加密与解密，并将加密结果以图片格式进行保存。因此为了实现对图片的调度及保存，使用头文件atlimage.h进行对图片的操作，实现对图片的像素读取，图片的保存。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

3、异或。四、 代码实现cryptograph.h#include <string>#include <iostream>class plaintextpublic:plaintext();static void createplaintext(unsigned char a);static void SubBytes(unsigned char p16);static void inSubBytes(unsigned char p16);static void ShiftRows(unsigned char e);static void inShiftRows(unsig

4、ned 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 state16, unsigned char k4);static void KeyExpansion(unsigned char* key, unsigned char w44);plaintext();pr

5、ivate:;cryptograph.cpp#include "cryptography.h"using namespace std;static unsigned char sBox = ;/定义加密S盒/unsigned char insBox256 =;/定义解密S盒plaintext:plaintext()void plaintext:createplaintext(unsigned char a)/创建明文int i = 0;unsigned int p16;for (int j = 0; j<200; j+)if (aj = 0)break;for (;

6、i<16; i+)pi = ai;ai = ai + 16;void plaintext:SubBytes(unsigned char p16)/字节变换函数unsigned char b16;for (int i = 0; i<16; i+)bi = sBox(int)pi;void plaintext:inSubBytes(unsigned char p16)/逆字节变换函数unsigned char b16;for (int i = 0; i<16; i+)bi = insBox(int)pi;void plaintext:ShiftRows(unsigned char

7、 e)/行移位变换函数unsigned char t4;for (int i = 1; i<4; i+)for (int x = 0; x<4; x+)tx = ex + i * 4;for (int y = 0; y<4; y+)e(y + 4 - i) % 4 + i * 4 = ty;void plaintext:inShiftRows(unsigned char e)/逆行移位变换函数unsigned char t4;for (int i = 1; i<4; i+)for (int x = 0; x<4; x+)tx = ex + i * 4;for (i

8、nt y = 0; y<4; y+)e(y + i) % 4 + i * 4 = ty;void plaintext:MatrixToByte(unsigned char e)/列混合变换函数unsigned char t4;int r, c;for (c = 0; c< 4; c+)for (r = 0; r<4; r+)tr = er * 4 + c;for (r = 0; r<4; r+)er * 4 + c = FFmul(0x02, tr) FFmul(0x03, t(r + 1) % 4) FFmul(0x01, t(r + 2) % 4) FFmul(0x

9、01, t(r + 3) % 4);void plaintext:inMatrixToByte(unsigned char e)/逆列混合变换函数unsigned char t4;int r, c;for (c = 0; c< 4; c+)for (r = 0; r<4; r+)tr = er * 4 + c;for (r = 0; r<4; r+)er * 4 + c = FFmul(0x0e, tr) FFmul(0x0b, t(r + 1) % 4) FFmul(0x0d, t(r + 2) % 4) FFmul(0x09, t(r + 3) % 4);unsigned

10、 char plaintext:FFmul(unsigned char a, unsigned char b)unsigned char bw4;unsigned char res = 0;int i;bw0 = b;for (i = 1; i<4; i+)bwi = bwi - 1 << 1;if (bwi - 1 & 0x80)bwi = 0x1b;for (i = 0; i<4; i+)if (a >> i) & 0x01)res = bwi;return res;void plaintext:KeyAdding(unsigned ch

11、ar state16, unsigned char k4)/轮密钥加int r, c;for (c = 0; c<4; c+)for (r = 0; r<4; r+)stater + c * 4 = krc;void plaintext:KeyExpansion(unsigned char* key, unsigned char w44)/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+)fo

12、r (c = 0; c<4; c+)w0rc = keyr + c * 4;for (i = 1; i <= 10; i+)for (j = 0; j<4; j+)unsigned char t4;for (r = 0; r<4; r+)tr = j ? wirj - 1 : wi - 1r3;if (j = 0)unsigned char temp = t0;for (r = 0; r<3; r+)tr = sBoxt(r + 1) % 4;t3 = sBoxtemp;t0 = rci - 1;for (r = 0; r<4; r+)wirj = wi -

13、 1rj tr;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 w1144 = 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)unsigne

14、d char b16;for (int i = 0; i < (len / 16); i+)for (int j = 0; j<16; j+)bj = aj + i * 16;plaintext:KeyAdding(b, w0);for (int n = 1; n <= 10; n+)plaintext:SubBytes(b);plaintext:ShiftRows(b);if (n != 10)plaintext:MatrixToByte(b);plaintext:KeyAdding(b, wn);for (int m = 0; m<16; m+)am + i * 1

15、6 = bm;void inCipher(unsigned char a)unsigned char b16;for (int i = 0; i < (len / 16) ; i+)for (int j = 0; j<16; j+)bj = aj + i * 16;plaintext:KeyAdding(b, w10);for (int n = 9; n >= 0; n-)plaintext:inShiftRows(b);plaintext:inSubBytes(b);plaintext:KeyAdding(b, wn);if (n)plaintext:inMatrixToB

16、yte(b);for (int m = 0; m<16; m+)am + i * 16 = bm;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 =

17、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);elsedestImage.Create(srcWidth, srcHeight, srcBitsCount, 0);BYTE *destPtr = (BYTE*)destImage.GetBits(

18、);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 &destImag

19、e)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

20、(srcBitsCount = 32) /支持alpha通道destImage.Create(srcWidth, srcHeight, srcBitsCount, 1);elsedestImage.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*s

21、rcPitch);/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 key16 = /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 szBufferMAX_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