求各位达人将这个加密解密函数转换为PHP版本的

[xm1331305]

原加密解密程序为.net版本的。由于我不会.net所以请各人达人帮忙转换为php的。

谢谢

public static string Encrypt(string pToEncrypt, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();  //把字符串放到byte数组中   

            byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);
            //byte[]  inputByteArray=Encoding.Unicode.GetBytes(pToEncrypt);   

            des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);  //建立加密对象的密钥和偏移量 
            des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);   //原文使用ASCIIEncoding.ASCII方法的GetBytes方法  
            MemoryStream ms = new MemoryStream();     //使得输入密码必须输入英文文本 
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);

            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();

            StringBuilder ret = new StringBuilder();
            foreach (byte b in ms.ToArray())
            {
                ret.AppendFormat("{0:X2}", b);
            }
            ret.ToString();
            return ret.ToString();
        }

        /// <summary>
        /// DEC 解密过程 
        /// </summary>
        /// <param name="pToDecrypt"></param>
        /// <param name="sKey"></param>
        /// <returns></returns>
        public static string Decrypt(string pToDecrypt, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();

            byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
            for (int x = 0; x < pToDecrypt.Length / 2; x++)
            {
                int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
                inputByteArray[x] = (byte)i;
            }

            des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);  //建立加密对象的密钥和偏移量，此值重要，不能修改   
            des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);

            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();

            StringBuilder ret = new StringBuilder();  //建立StringBuild对象，CreateDecrypt使用的是流对象，必须把解密后的文本变成流对象   

            return System.Text.Encoding.Default.GetString(ms.ToArray());
        }