AES加密算法实验报告.doc

-大学计算机学院、软件学院实验报告课程名称密码学与网络平安实验课时2实验工程AES加密算法实验时间实验目的完成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展加密与解密，并将加密结果以图片格式进展保存。因此为了实现对图片的调度及保存，使用头文件atlimage.h进展对图片的操作，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，需要进展图片的选取，本次实验中使用在弹窗中选取文件的方式，使用头文件mdlg.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：进展一次行上的置换；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局部进展按位异或。四、 代码实现cryptograph.h*include<string>*include<iostream>classplainte*tpublic:plainte*t();staticvoid createplainte*t(unsignedchar a);staticvoid SubBytes(unsignedchar p16);staticvoid inSubBytes(unsignedchar p16);staticvoid ShiftRows(unsignedchar e);staticvoid inShiftRows(unsignedchar e);staticvoid Matri*ToByte(unsignedchar e);staticvoid inMatri*ToByte(unsignedchar e);staticunsignedchar FFmul(unsignedchar a, unsignedchar b);staticvoid KeyAdding(unsignedchar state16, unsignedchar k4);staticvoid KeyE*pansion(unsignedchar* key, unsignedchar w44);plainte*t();private:;cryptograph.cpp*include"cryptography.h"usingnamespace std;staticunsignedchar sBo* = ;/定义加密S盒/unsignedchar insBo*256 =;/定义解密S盒plainte*t:plainte*t()voidplainte*t:createplainte*t(unsignedchara)/创立明文int i = 0;unsignedint p16;for (int j = 0; j<200; j+)if (aj = 0)break;for (; i<16; i+)pi = ai;ai = ai + 16;voidplainte*t:SubBytes(unsignedcharp16)/字节变换函数unsignedchar b16;for (int i = 0; i<16; i+)bi = sBo*(int)pi;voidplainte*t:inSubBytes(unsignedcharp16)/逆字节变换函数unsignedchar b16;for (int i = 0; i<16; i+)bi = insBo*(int)pi;voidplainte*t:ShiftRows(unsignedchare)/行移位变换函数unsignedchar t4;for (int i = 1; i<4; i+)for (int * = 0; *<4; *+)t* = e* + i * 4;for (int y = 0; y<4; y+)e(y + 4 - i) % 4 + i * 4 = ty;voidplainte*t:inShiftRows(unsignedchare)/逆行移位变换函数unsignedchar t4;for (int i = 1; i<4; i+)for (int * = 0; *<4; *+)t* = e* + i * 4;for (int y = 0; y<4; y+)e(y + i) % 4 + i * 4 = ty;voidplainte*t:Matri*ToByte(unsignedchare)/列混合变换函数unsignedchar 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(0*02, tr) FFmul(0*03, t(r + 1) % 4) FFmul(0*01, t(r + 2) % 4) FFmul(0*01, t(r + 3) % 4);voidplainte*t:inMatri*ToByte(unsignedchare)/逆列混合变换函数unsignedchar 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(0*0e, tr) FFmul(0*0b, t(r + 1) % 4) FFmul(0*0d, t(r + 2) % 4) FFmul(0*09, t(r + 3) % 4);unsignedcharplainte*t:FFmul(unsignedchara, unsignedcharb)unsignedchar bw4;unsignedchar res = 0;int i;bw0 = b;for (i = 1; i<4; i+)bwi = bwi - 1 << 1;if (bwi - 1 & 0*80)bwi = 0*1b;for (i = 0; i<4; i+)if (a >> i) & 0*01)res = bwi;return res;voidplainte*t:KeyAdding(unsignedcharstate16, unsignedchark4)/轮密钥加int r, c;for (c = 0; c<4; c+)for (r = 0; r<4; r+)stater + c * 4 = krc;voidplainte*t:KeyE*pansion(unsignedchar* key, unsignedcharw44)/密钥扩展int i, j, r, c;unsignedchar rc = 0*01, 0*02, 0*04, 0*08, 0*10, 0*20, 0*40, 0*80, 0*1b, 0*36 ;for (r = 0; r<4; r+)for (c = 0; c<4; c+)w0rc = keyr + c * 4;for (i = 1; i <= 10; i+)for (j = 0; j<4; j+)unsignedchar t4;for (r = 0; r<4; r+)tr = j " wirj - 1 : wi - 1r3;if (j = 0)unsignedchar temp = t0;for (r = 0; r<3; r+)tr = sBo*t(r + 1) % 4;t3 = sBo*temp;t0 = rci - 1;for (r = 0; r<4; r+)wirj = wi - 1rj tr;plainte*t:plainte*t()main.cpp*include<iostream>*include<atlimage.h>*include<mdlg.h>/使用文件选取功能*include"cryptography.h"usingnamespace std;unsignedchar 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(unsignedchara)unsignedchar b16;for (int i = 0; i < (len / 16); i+)for (int j = 0; j<16; j+)bj = aj + i * 16;plainte*t:KeyAdding(b, w0);for (int n = 1; n <= 10; n+)plainte*t:SubBytes(b);plainte*t:ShiftRows(b);if (n != 10)plainte*t:Matri*ToByte(b);plainte*t:KeyAdding(b, wn);for (int m = 0; m<16; m+)am + i * 16 = bm;void inCipher(unsignedchara)unsignedchar b16;for (int i = 0; i < (len / 16) ; i+)for (int j = 0; j<16; j+)bj = aj + i * 16;plainte*t:KeyAdding(b, w10);for (int n = 9; n >= 0; n-)plainte*t:inShiftRows(b);plainte*t:inSubBytes(b);plainte*t:KeyAdding(b, wn);if (n)plainte*t:inMatri*ToByte(b);for (int m = 0; m<16; m+)am + i * 16 = bm;bool ImageCopy(constCImage &srcImage, CImage &destImage)int i, j;/循环变量if (srcImage.IsNull()returnFALSE;/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();/创立新图像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();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);returnTRUE;bool inImageCopy(constCImage &srcImage, CImage &destImage)int i, j;/循环变量if (srcImage.IsNull()returnFALSE;/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();/创立新图像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();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);returnTRUE;int main()unsignedchar key16 = /固定密钥0*77, 0*59, 0*c5, 0*a4,0*55, 0*90, 0*a4, 0*a3,0*b2, 0*cc, 0*01, 0*a9,0*cb, 0*ac, 0*77, 0*23 ;plainte*t:KeyE*pansion(key, w);TCHAR szBufferMA*_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.nMa*File = sizeof(szBuffer) / sizeof(*szBuffer);ofn.nFilterInde* = 0;ofn.Flags = OFN_PATHMUSTE*IST | OFN_FILEMUSTE*IST | OFN_E*PLORER;/标志如果是多项选择要加上OFN_ALLOWMULTISELECT BOOL 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");本数据记录和计算运行程序，出现选择图片界面加密完毕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。小结 通过本次试验，成功的完成了对AES密码算法的初步编写，了解了AES算法的工作原理。对于图片加密方面，掌握了新的调用图片的方法，使用头文件atlimage.h大大简化了c+中对图片调用的难度。同时在文件读取方面使用了头文件mdlg.h，使得程序在使用上更加方便。指导教师评议 成绩评定：指导教师签名：. z.