C#一个封装的加密解密类

    using System;
    using System.Text;
    using System.Globalization;
    using System.Security.Cryptography;
    using System.Windows.Forms;
    namespace Jh.Encrypts
    {
     public class JhEncrypt
     {
      /// <summary>
      /// 构造方法
      /// </summary>
      public JhEncrypt()
      {
      }
      /// <summary>
      /// 使用缺省密钥字符串加密
      /// </summary>
      /// <param name="original">明文</param>
      /// <returns>密文</returns>
      public static string Encrypt(string original)
      {
       return Encrypt(original,"JASONHEUNG");
      }
      /// <summary>
      /// 使用缺省密钥解密
      /// </summary>
      /// <param name="original">密文</param>
      /// <returns>明文</returns>
      public static string Decrypt(string original)
      {
       return Decrypt(original,"JASONHEUNG",System.Text.Encoding.Default);
      }
      /// <summary>
      /// 使用给定密钥解密
      /// </summary>
      /// <param name="original">密文</param>
      /// <param name="key">密钥</param>
      /// <returns>明文</returns>
      public static string Decrypt(string original, string key)
      {
       return Decrypt(original,key,System.Text.Encoding.Default);
      }
      /// <summary>
      /// 使用缺省密钥解密,返回指定编码方式明文
      /// </summary>
      /// <param name="original">密文</param>
      /// <param name="encoding">编码方式</param>
      /// <returns>明文</returns>
      public static string Decrypt(string original,Encoding encoding)
      {
       return Decrypt(original,"JASONHEUNG",encoding);
      }
      /// <summary>
      /// 使用给定密钥加密
      /// </summary>
      /// <param name="original">原始文字</param>
      /// <param name="key">密钥</param>
      /// <param name="encoding">字符编码方案</param>
      /// <returns>密文</returns>
      public static string Encrypt(string original, string key)
      {
       byte[] buff = System.Text.Encoding.Default.GetBytes(original);
       byte[] kb = System.Text.Encoding.Default.GetBytes(key);
       return Convert.ToBase64String(Encrypt(buff,kb));
      }

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