利用密码学库的AES源代码

// 4thTry.cpp : Defines the entry point for the console application. // //#include "stdafx.h" #include <afx.h> #include <fstream> #ifdef _DEBUG # pragma comment ( lib, "cryptlib" ) #else # pragma comment ( lib, "cryptlib" ) #endif #include <iostream> using namespace std; #include <cryptopp/aes.h> using namespace CryptoPP; int main(int argc, char* argv[]) { int key_length=32; cout << "AES Parameters: " << endl; cout << "Algorithm name : " << AES::StaticAlgorithmName() << endl; //Crypto++库中一般用字节数来表示长度，而不是常用的字节数 cout << "Block size : " << AES::BLOCKSIZE * 8 << endl; cout << "Min key length : " << AES::MIN_KEYLENGTH * 8 << endl; cout << "Max key length : " << AES::MAX_KEYLENGTH * 8 << endl; CString name1="1.bmp"; CString name2="hellow3.bmp"; CFile rfile,wfile; rfile.Open(name1,CFile::modeRead); wfile.Open(name2,CFile::modeWrite|CFile::modeCreate); DWORD length=rfile.GetLength(); //确定原始文件有多少个16字节的块 long block_count; if((length-54)%AES::BLOCKSIZE==0) { block_count=(length-54)/AES::BLOCKSIZE; } else { block_count=(length-54)/AES::BLOCKSIZE+1; } BYTE head_buffer[54]; BYTE *data_buffer=new BYTE[length-54]; rfile.Read(head_buffer,54); wfile.Write(head_buffer,54); rfile.Read(data_buffer,length-54); AESEncryption aesEncryptor; //加密器 unsigned char aesKey[AES::DEFAULT_KEYLENGTH]; //密钥 unsigned char inBlock[AES::BLOCKSIZE]; //要加密的数据块 unsigned char outBlock[AES::BLOCKSIZE]; //加密后的密文块 unsigned char xorBlock[AES::BLOCKSIZE]; //必须设定为全零 cout << "\n开始加密 " <<endl; for(int j=0;j<block_count;j++) { memset( inBlock, 0, AES::BLOCKSIZE ); memset( xorBlock, 0, AES::BLOCKSIZE ); memset( outBlock, 0, AES::BLOCKSIZE ); for(int k=0;k<AES::BLOCKSIZE;k++) { inBlock[k]=*(data_buffer+j*AES::BLOCKSIZE+k); } aesEncryptor.SetKey( aesKey, key_length/*AES::DEFAULT_KEYLENGTH */); //设定加密密钥 aesEncryptor.ProcessAndXorBlock( inBlock, xorBlock, outBlock ); //加密 wfile.Write(outBlock,AES::BLOCKSIZE); } rfile.Close(); wfile.Close(); //cout << "\n加密完成，处理时间是 "<< run_time_compute.dfTim <<endl; CString name3="hellow2.bmp"; rfile.Open(name2,CFile::modeRead); wfile.Open(name3,CFile::modeWrite|CFile::modeCreate); rfile.Read(head_buffer,54); wfile.Write(head_buffer,54); rfile.Read(data_buffer,length-54); AESDecryption aesDecryptor; //加密器 cout << "\n开始解密 " <<endl; for(j=0;j<block_count;j++) { memset( inBlock, 0, AES::BLOCKSIZE ); memset( xorBlock, 0, AES::BLOCKSIZE ); memset( outBlock, 0, AES::BLOCKSIZE ); for(int k=0;k<AES::BLOCKSIZE;k++) { inBlock[k]=*(data_buffer+j*AES::BLOCKSIZE+k); } aesDecryptor.SetKey( aesKey, key_length/*AES::DEFAULT_KEYLENGTH */ ); //设定加密密钥 aesDecryptor.ProcessAndXorBlock( inBlock, xorBlock, outBlock ); //加密 wfile.Write(outBlock,AES::BLOCKSIZE); } rfile.Close(); wfile.Close(); return 0; }