Password encryption method

The source code to encrypt the password

Users. PASSWD = Decryption.encryptdes (getmd5str (_httpreuqeststring["Passwd"]. ToString ()), Commonhelper.getappsettings ("pagepwd"));

    /// <summary>    ///MD5 16-bit encryption password is lowercase/// </summary>    /// <param name= "convertstring" ></param>    /// <returns></returns>     Public Static stringGETMD5STR (stringconvertstring) {System.Security.Cryptography.MD5CryptoServiceProvider MD5=NewSystem.Security.Cryptography.MD5CryptoServiceProvider (); stringT2 = bitconverter.tostring (Md5.computehash (UTF8Encoding.Default.GetBytes (convertstring)),4,8); T2= T2. Replace ("-",""); T2=T2.        ToLower (); returnT2; }

Des encryption and decryption method

//default key Vector        Private Static byte[] Keys = {0xEF,0xAB,0x56,0x78,0x90,0x34,0xCD,0x12 }; /// <summary>        ///des encrypted String/// </summary>        /// <param name= "encryptstring" >string to encrypt</param>        /// <param name= "Encryptkey" >encryption key, required for 8-bit</param>        /// <returns>encryption successfully returns the encrypted string, failed to return the source string</returns>         Public Static stringEncryptdes (stringEncryptString,stringEncryptkey) {            Try            {                byte[] RgbKey = Encoding.UTF8.GetBytes (encryptkey.substring (0,8)); byte[] Rgbiv =Keys; byte[] Inputbytearray =Encoding.UTF8.GetBytes (encryptstring); DESCryptoServiceProvider DCSP=NewDESCryptoServiceProvider (); MemoryStream Mstream=NewMemoryStream (); CryptoStream Cstream=NewCryptoStream (Mstream, Dcsp.createencryptor (RgbKey, Rgbiv), cryptostreammode.write); Cstream.write (Inputbytearray,0, inputbytearray.length);                Cstream.flushfinalblock (); returnconvert.tobase64string (Mstream.toarray ()); }            Catch            {                returnencryptstring; }        }        /// <summary>        ///des decryption String/// </summary>        /// <param name= "decryptstring" >string to decrypt</param>        /// <param name= "Decryptkey" >Decryption key, required to be 8-bit, same as encryption key</param>        /// <returns>decryption succeeded in returning the decrypted string, failed to return the source string</returns>         Public Static stringDecryptdes (stringDecryptstring,stringDecryptkey) {            Try            {                byte[] RgbKey = Encoding.UTF8.GetBytes (decryptkey.substring (0,8)); byte[] Rgbiv =Keys; byte[] Inputbytearray =convert.frombase64string (decryptstring); DESCryptoServiceProvider DCSP=NewDESCryptoServiceProvider (); MemoryStream Mstream=NewMemoryStream (); CryptoStream Cstream=NewCryptoStream (Mstream, DCSP.                CreateDecryptor (RgbKey, Rgbiv), cryptostreammode.write); Cstream.write (Inputbytearray,0, inputbytearray.length);                Cstream.flushfinalblock (); returnEncoding.UTF8.GetString (Mstream.toarray ()); }            Catch            {                returndecryptstring; }        }

Password encryption method