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();
        }