using System;
using System.Text;
namespace Common
{
  /// <summary>
  /// 實現(xiàn)Base64加密解密
  /// 作者：周公
  /// </summary>
  public sealed class Base64
  {
    /// <summary>
    /// Base64加密
    /// </summary>
    /// <param name="codeName">加密采用的編碼方式</param>
    /// <param name="source">待加密的明文</param>
    /// <returns></returns>
    public static string EncodeBase64(Encoding encode, string source)
    {
      byte[] bytes = encode.GetBytes(source);
      try
      {
        encode = Convert.ToBase64String(bytes);
      }
      catch
      {
        encode = source;
      }
      return encode;
    }
    /// <summary>
    /// Base64加密，采用utf8編碼方式加密
    /// </summary>
    /// <param name="source">待加密的明文</param>
    /// <returns>加密后的字符串</returns>
    public static string EncodeBase64(string source)
    {
      return EncodeBase64(Encoding.UTF8, source);
    }
    /// <summary>
    /// Base64解密
    /// </summary>
    /// <param name="codeName">解密采用的編碼方式，注意和加密時采用的方式一致</param>
    /// <param name="result">待解密的密文</param>
    /// <returns>解密后的字符串</returns>
    public static string DecodeBase64(Encoding encode, string result)
    {
      string decode = "";
      byte[] bytes = Convert.FromBase64String(result);
      try
      {
        decode = encode.GetString(bytes);
      }
      catch
      {
        decode = result;
      }
      return decode;
    }
    /// <summary>
    /// Base64解密，采用utf8編碼方式解密
    /// </summary>
    /// <param name="result">待解密的密文</param>
    /// <returns>解密后的字符串</returns>
    public static string DecodeBase64(string result)
    {
      return DecodeBase64(Encoding.UTF8, result);
    }
  }
}