C#使用DES加解密数据

C#的DES加解密，同时支持.NET与.NET CF 2.0平台，这样就可以把一个封装好的类同时用在PC/WM手机上。C#的DES比其他语言的DES算法多了个IV实现，其实IV可以设置为随意的8位byte即可，注意要加入desc.Mode = CipherMode.ECB 兼容其他语言的Des加密算法。

直接贴出代码，下面部分代码比较普通，高手们切勿见笑！

using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;
using System.Globalization;
using System.IO;
class Cls_Cryptography
{
    /// <summary>
    /// IV随便设置为8位
    /// </summary>
    private static byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
    /// <summary>
    /// 加密字符串
    /// </summary>
    /// <returns>返回密文</returns>
    public static String EncryptString(String key, String str)
    {
        byte[] data = Encoding.Default.GetBytes(str);
        byte[] result = EncryptData(key, data);
        if (result != null)
            return Convert.ToBase64String(result, 0, result.Length);
        else
            return "";
    }
    /// <summary>
    /// 加密二进制数据
    /// </summary>
    /// <returns>返回二进制密文</returns>
    public static byte[] EncryptData(String key, byte[] data)
    {
        byte[] bKey = Encoding.Default.GetBytes(key.Substring(0, 8));
        byte[] bIV = IV;
        try
        {
            DESCryptoServiceProvider desc = new DESCryptoServiceProvider();
            desc.Mode = CipherMode.ECB;//兼容其他语言的Des加密算法
            desc.Padding = PaddingMode.Zeros;//自动补0
            MemoryStream mStream = new MemoryStream();
            CryptoStream cStream = new CryptoStream(mStream, desc.CreateEncryptor(bKey, bIV), CryptoStreamMode.Write);
            cStream.Write(data, 0, data.Length);
            cStream.FlushFinalBlock();
            return mStream.ToArray();
        }
        catch
        {
            return null;
        }
    }
    /// <summary>
    /// 把密文解密为明文
    /// </summary>
    /// <returns>返回明文</returns>
    public static String DecryptString(String key, String decryptStr)
    {
        byte[] data = Convert.FromBase64String(decryptStr);
        byte[] result = DecryptData(key, data);
        if (result != null)
            return Encoding.Default.GetString(result, 0, result.Length);
        else
            return "";
    }
    
    /// <summary>
    /// 把二进制密文解密为明文二进制
    /// </summary>
    /// <returns>返回明文二进制</returns>
    public static byte[] DecryptData(String key, byte[] data)
    {
        try
        {
            byte[] bKey = Encoding.Default.GetBytes(key.Substring(0, 8));
            byte[] bIV = IV;
            DESCryptoServiceProvider desc = new DESCryptoServiceProvider();
            desc.Mode = CipherMode.ECB;//兼容其他语言的Des加密算法
            desc.Padding = PaddingMode.Zeros;//自动补0
            MemoryStream mStream = new MemoryStream();
            CryptoStream cStream = new CryptoStream(mStream, desc.CreateDecryptor(bKey, bIV), CryptoStreamMode.Write);
            cStream.Write(data, 0, data.Length);
            cStream.FlushFinalBlock();
            return mStream.ToArray();
        }
        catch
        {
            return null;
        }
    }
}

至于怎么调用。。。很简单的说

String str = Cls_Cryptography.EncryptString("12345678", "12345678");
        MessageBox.Show(str);
        str = Cls_Cryptography.DecryptString("12345678", str);
        MessageBox.Show(str);