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using System;
using System.IO;
using System.Data;
using System.Web;
using BP.Web;
using BP.Sys;
using System.Text;
using System.Security.Cryptography;
using BP.Difference;
namespace BP.Tools
{
public class EncHelper
{
private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };//自定义密匙
private static string encryptKey = "ccflow123";
public static bool EncryptDES(string inFile, string outFile)
{
byte[] rgb = Keys;
try
{
byte[] rgbKeys = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
FileStream inFs = new FileStream(inFile, FileMode.Open, FileAccess.Read);//读入流
FileStream outFs = new FileStream(outFile, FileMode.OpenOrCreate, FileAccess.Write);// 等待写入流
outFs.SetLength(0);//帮助读写的变量
byte[] byteIn = new byte[100];//放临时读入的流
long readLen = 0;//读入流的长度
long totalLen = inFs.Length;//读入流的总长度
int everylen = 0;//每次读入流的长度
DES des = new DESCryptoServiceProvider();//将inFile加密后放到outFile
CryptoStream encStream = new CryptoStream(outFs, des.CreateEncryptor(rgb, rgbKeys), CryptoStreamMode.Write);
while (readLen < totalLen)
{
everylen = inFs.Read(byteIn, 0, 100);
encStream.Write(byteIn, 0, everylen);
readLen = readLen + everylen;
}
encStream.Close();
inFs.Close();
outFs.Close();
return true;//加密成功
}
catch (Exception ex)
{
HttpContextHelper.ResponseWrite(ex.Message.ToString());
return false;//加密失败
}
}
public static bool DecryptDES(string inFile, string outFile)
{
byte[] rgb = Keys;
try
{
byte[] rgbKeys = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
FileStream inFs = new FileStream(inFile, FileMode.Open, FileAccess.Read);//读入流
FileStream outFs = new FileStream(outFile, FileMode.OpenOrCreate, FileAccess.Write);// 等待写入流
outFs.SetLength(0);//帮助读写的变量
byte[] byteIn = new byte[100];//放临时读入的流
long readLen = 0;//读入流的长度
long totalLen = inFs.Length;//读入流的总长度
int everylen = 0;//每次读入流的长度
DES des = new DESCryptoServiceProvider();//将inFile加密后放到outFile
CryptoStream encStream = new CryptoStream(outFs, des.CreateDecryptor(rgb, rgbKeys), CryptoStreamMode.Write);
while (readLen < totalLen)
{
everylen = inFs.Read(byteIn, 0, 100);
encStream.Write(byteIn, 0, everylen);
readLen = readLen + everylen;
}
encStream.Close();
inFs.Close();
outFs.Close();
encStream.Dispose();
inFs.Dispose();
outFs.Dispose();
return true;//加密成功
}
catch (Exception ex)
{
HttpContextHelper.ResponseWrite(ex.Message.ToString());
return false;//加密失败
}
}
}
}