/**
    *
    * @date 2014-11-01        
    *
    * @author 邓尹平
    *
    * @par 成员列表类 说明
    * 主要负责管理成员 提供搜索\排序和操作的方法
    * 
    * @par 版权声明
    * 深圳市多元世纪信息技术有限公司 版权所有
    * 
    * @see 使用此类时参照一些其他类可以写在这里
    * 
    * @todo 该类有待完成的任务 一条条列出 完成一条删除一条
    *
    * @bug 该类已知的Bug一条条列出 完成一条删除一条
    *
*/

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

namespace Muchinfo.PC.Common.Helpers
{
    public class DESHelper
    {
        private static readonly string _key = "MuChInFo";

        /// <summary>
        /// DES加密
        /// </summary>
        /// <param name="sourceString">The source string.</param>
        /// <returns>System.String.</returns>
        public static string Encrypt(string sourceString)
        {
            try
            {
                byte[] data = Encoding.UTF8.GetBytes(sourceString);
                var des = new DESCryptoServiceProvider
                {
                    Key = Encoding.ASCII.GetBytes(_key),
                    IV = Encoding.ASCII.GetBytes(_key)
                };
                ICryptoTransform desencrypt = des.CreateEncryptor();
                byte[] result = desencrypt.TransformFinalBlock(data, 0, data.Length);
                return BitConverter.ToString(result);
            }
            catch (Exception e)
            {
                throw e;
            }
        }

        /// <summary>
        /// DES解密
        /// </summary>
        /// <param name="encryptedString">The encrypted string.</param>
        /// <returns>System.String.</returns>
        public static string Decrypt(string encryptedString)
        {
            try
            {
                string[] sInput = encryptedString.Split("-".ToCharArray());
                byte[] data = new byte[sInput.Length];
                for (int i = 0; i < sInput.Length; i++)
                {
                    data[i] = byte.Parse(sInput[i], NumberStyles.HexNumber);
                }
                var DES = new DESCryptoServiceProvider
                {
                    Key = Encoding.ASCII.GetBytes(_key),
                    IV = Encoding.ASCII.GetBytes(_key)
                };
                ICryptoTransform desencrypt = DES.CreateDecryptor();
                byte[] result = desencrypt.TransformFinalBlock(data, 0, data.Length);
                return Encoding.UTF8.GetString(result);
            }
            catch (Exception e)
            {
                throw e;
            }
        }
    }
}