c# 做一个DES算法加密解密的窗体

c# 做一个能实现DES算法加密解密的窗体，差不多的就给加分啊

C#有专门的类，直接调用就可以了
//类名:EcanSecurity
//作用:加密解密
//作者：刘典武
//时间：2010-12-01

using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;
using System.IO;

namespace Ecan
{
public class EcanSecurity
{
/*MD5是message-digest algorithm 5（信息-摘要算法）的缩写，
* 被广泛用于加密和解密技术上，它可以说是文件的“数字指纹”。
* 任何一个文件，无论是可执行程序、图像文件、临时文件或者其他任何类型的文件，
* 也不管它体积多大，都有且只有一个独一无二的MD5信息值，并且如果这个文件被修改过，
* 它的MD5值也将随之改变。因此，我们可以通过对比同一文件的MD5值，
* 来校验这个文件是否被“篡改”过。*/

/// <summary>
/// MD5加密函数
/// </summary>
/// <param name="str">要加密的字符串</param>
/// <returns>加密后的字符串</returns>
///
public string md5_Encode(string str)
{
MD5 m = new MD5CryptoServiceProvider();
byte[] data = Encoding.Default.GetBytes(str);
byte[] result = m.ComputeHash(data);
string ret1 = "";
try
{
for (int j = 0; j < result.Length; j++)
{
ret1 += result[j].ToString("x").PadLeft(2, '0');
}
return ret1;
}
catch
{
return str;
}
}

/// <summary>
/// 简单加密函数
/// </summary>
/// <param name="str">要加密的字符串</param>
/// <returns>返回加密后的字符串</returns>
///
public string simple_Encode(string str)
{
string s = "";
try
{
for (int i = 0; i < str.Length; i++)
{
s += (char)(str[i] + 10 - 1 * 2);
}
return s;
}
catch
{
return str;
}
}

/// <summary>
/// 简单解密函数
/// </summary>
/// <param name="str">要解密的字符串</param>
/// <returns>返回解密后的字符串</returns>
///
public string simple_Decode(string str)
{
string s = "";
try
{
for (int i = 0; i < str.Length; i++)
{
s += (char)(str[i] - 10 + 1 * 2);
}
return s;
}
catch
{
return str;
}
}

//默认密钥向量
private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };

/// <summary>
/// 对称加密法加密函数
/// </summary>
/// <param name="encryptString">待加密的字符串</param>
/// <param name="encryptKey">加密密钥,要求为8位</param>
/// <returns>加密成功返回加密后的字符串，失败返回源串</returns>

public string symmetry_Encode(string encryptString, string encryptKey)
{
try
{
byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
byte[] rgbIV = Keys;
byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
MemoryStream mStream = new MemoryStream();
CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
cStream.Write(inputByteArray, 0, inputByteArray.Length);
cStream.FlushFinalBlock();
return Convert.ToBase64String(mStream.ToArray());
}
catch
{
return encryptString;
}
}

/// <summary>
/// 对称加密法解密函数
/// </summary>
/// <param name="decryptString">待解密的字符串</param>
/// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>
/// <returns>解密成功返回解密后的字符串，失败返源串</returns>

public string symmetry_Decode(string decryptString, string decryptKey)
{
try
{
byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
byte[] rgbIV = Keys;
byte[] inputByteArray = Convert.FromBase64String(decryptString);
DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
MemoryStream mStream = new MemoryStream();
CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
cStream.Write(inputByteArray, 0, inputByteArray.Length);
cStream.FlushFinalBlock();
return Encoding.UTF8.GetString(mStream.ToArray());
}
catch
{
return decryptString;
}
}
}
}

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