[.net]标准 3DES 加密/解密

using System;
using System.Security.Cryptography;
using System.Text;

/**//// <summary>
/// Crypto3DES 的摘要说明。
/// </summary>
public class Crypto3DES
...{
    public Crypto3DES()
    ...{
        //
        // TODO: 在此处添加构造函数逻辑
        //
    }

    private System.Text.Encoding encoding;

    /**//// <summary>
    /// 获取密匙
    /// </summary>
    public string Key
    ...{
        get
        ...{
            return System.Configuration.ConfigurationSettings.AppSettings[ "cryptoKey" ];
        }
    }

    /**//// <summary>
    /// 获取或设置加密解密的编码
    /// </summary>
    public System.Text.Encoding Encoding
    ...{
        get
        ...{
            if( encoding == null )
            ...{
                encoding = System.Text.Encoding.UTF8;
            }
            return encoding;
        }

        set
        ...{
            encoding = value;
        }
    }

    /**//// <summary>
    /// 加密
    /// </summary>
    /// <param name="strString"></param>
    /// <param name="strKey"></param>
    /// <param name="encoding"></param>
    /// <returns></returns>
    public string Encrypt3DES( string strString )
    ...{
        TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();

        DES.Key = Encoding.GetBytes( this.Key );
        DES.Mode = CipherMode.ECB;

        ICryptoTransform DESEncrypt = DES.CreateEncryptor();

        byte[] Buffer = encoding.GetBytes(strString);

        return Convert.ToBase64String(DESEncrypt.TransformFinalBlock(Buffer, 0, Buffer.Length));
    }

    /**//// <summary>
    /// 解密
    /// </summary>
    /// <param name="strString"></param>
    /// <param name="strKey"></param>
    /// <returns></returns>
    public string Decrypt3DES( string strString )
    ...{   
        TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();

        DES.Key = Encoding.UTF8.GetBytes( this.Key );
        DES.Mode = CipherMode.ECB;
        ICryptoTransform DESDecrypt = DES.CreateDecryptor();

        byte[] Buffer = Convert.FromBase64String(strString);
        return UTF8Encoding.UTF8.GetString( DESDecrypt.TransformFinalBlock(Buffer, 0, Buffer.Length) );
    }
}