请问那位朋友可以帮忙把这 2 个 c# 方法，给转成 PHP5.5 的方法吗？谢谢。

大家好，本人 php 菜鸟一枚，现在正在边工作边学习 php ，遇到一个 c#方法转为 php 方法的问题。实在没办法了，只有发帖求助，还请哪位朋友帮忙，将以下 2 个方法转换为 php 的方法，不胜感激！

当然，我明白，第一天注册，第一个帖子就是索取，这样的行为很被人不齿，但是迫于无奈，还是希望能够得到某位朋友的帮助，谢谢你。

public static string Decrypt (string Text, string sKey )
        {
            DESCryptoServiceProvider provider = new DESCryptoServiceProvider ();
            int num = Text.Length / 2;
            byte[] buffer = new byte[num];
            for (int i = 0; i < num; i++)
            {
                int num3 = Convert.ToInt32 (Text.Substring (i * 2, 2 ), 0x10 );
                buffer[i] = (byte ) num3;
            }
            provider.Key = Encoding.ASCII.GetBytes (FormsAuthentication.HashPasswordForStoringInConfigFile (sKey, "md5").Substring (0, 8 ));
            provider.IV = Encoding.ASCII.GetBytes (FormsAuthentication.HashPasswordForStoringInConfigFile (sKey, "md5").Substring (0, 8 ));
            MemoryStream stream = new MemoryStream ();
            CryptoStream stream2 = new CryptoStream (stream, provider.CreateDecryptor (), CryptoStreamMode.Write );
            stream2.Write (buffer, 0, buffer.Length );
            stream2.FlushFinalBlock ();
            return Encoding.Default.GetString (stream.ToArray ());
        }

 public static string Encrypt (string Text, string sKey )
        {
            DESCryptoServiceProvider provider = new DESCryptoServiceProvider ();
            byte[] bytes = Encoding.Default.GetBytes (Text );
            provider.Key = Encoding.ASCII.GetBytes (FormsAuthentication.HashPasswordForStoringInConfigFile (sKey, "md5").Substring (0, 8 ));
            provider.IV = Encoding.ASCII.GetBytes (FormsAuthentication.HashPasswordForStoringInConfigFile (sKey, "md5").Substring (0, 8 ));
            MemoryStream stream = new MemoryStream ();
            CryptoStream stream2 = new CryptoStream (stream, provider.CreateEncryptor (), CryptoStreamMode.Write );
            stream2.Write (bytes, 0, bytes.Length );
            stream2.FlushFinalBlock ();
            StringBuilder builder = new StringBuilder ();
            foreach (byte num in stream.ToArray ())
            {
                builder.AppendFormat ("{0:X2}", num );
            }
            return builder.ToString ();
        }