C # encryption algorithm

 public Static class common    {        #region MD5 encryption        //&L T;summary>          //MD5 encryption          //&LT;/SUMMARY&G T          //<param name= "strsource" > Required encrypted string </param>     & nbsp    //&LT;RETURNS&GT;MD5 encrypted string </returns>           public static string Md5encrypt (String strsource)         {           //Put the string in a byte array  & nbsp;            byte[] Bytin = System.Text.Encoding.Default.GetBytes (strsource);  & nbsp        //Establish keys and offsets for encrypted objects                     &NB Sp Byte[] IV = {102, 16, 93, 156, 78, 4, 218, 32};//define offsets               byte[] Key = {55, 103, 246, 79, 36, 99, 167, 3};//define key              //Instance DES encryption class               DESCryptoServiceProvider mobjcryptoservice = new DESCryptoServiceProvider ();    &N Bsp       Mobjcryptoservice.key = iv;            MOBJCRYPTOSERVICE.IV = key;&nbsp ;           ICryptoTransform encrypto = Mobjcryptoservice.createencryptor ();      & nbsp    //instance MemoryStream stream encryption files               System.IO.MemoryStream ms = new System.IO.MemoryStream ();            CryptoStream cs = new CryptoStream (MS, Encrypto, Crypt Ostreammode.write);            CS. Write (bytin, 0, Bytin.length);            CS. FlushFinalBlock ();            return System.Convert.ToBase64String (Ms. ToArray ());      }       //<summary>          //MD5 Decrypt &N bsp;        //</summary>          //<param name= "Sou Rce "> String to Decrypt </param>          //&LT;RETURNS&GT;MD5 decrypted string </returns>           public static string Md5decrypt (String Source)         {           //Convert decrypted string to byte array               byte[] Bytin = Sy Stem. Convert.frombase64string (Source);           //gives decrypted key and offset, the key and offset must be the same as the key and offset at the time of encryption                Byte[] IV = {102, 16, 93, 156, 78, 4, 218, 32};//define offsets &NBSP;&NBSP;&NBSP ;           byte[] key = {55, 103, 246, 79, 36, 99, 167, 3};//define key       &NBS P       DESCryptoServiceProvider mobjcryptoservice = new DESCryptoServiceProvider ();            Mobjcryptoservice.key = iv;            MOBJCRYPTOSERVICE.IV = key;      &NBSP ;    //decryption of instance streams               System.IO.MemoryStream ms = new System.IO.Me Morystream (bytin, 0, Bytin.length);            ICryptoTransform encrypto = Mobjcryptoservic E.createdecryptor ();            CryptoStream cs = new CryptoStream (MS, Encrypto, Cryptostrea Mmode.read);            StreamReader strd = new StreamReader (cs, encoding.default);  &N Bsp         return STRD. ReadToEnd ();       }        #endregion         #region Dynamic Encryption &NB Sp       private static byte[] s_bytkey;        static Common ()   &nbsp     {            S_bytkey = new byte[] {0xa1, 0xb2, 0xc3, 0xd4, 0xe5, 0x16, 0x27, 0x38, 0x49, 0x61, 0x72, 0x83, 0x94, 0xa5, 0xb6};       }       //<sum mary>       //decryption        //</summary>       // <param name= "text" ></param>       //<param name= "key" ></param>  & nbsp    //<returns></returns>        public static string Putbykey (string text, St Ring key)         {            byte[] buffer = new Byte[text. length];            byte[] bytes = Encoding.UTF8.GetBytes ( Dscf.Global.Common.Common.DisposeId (key));            RijndaelManaged managed = new RijndaelManaged ();            buffer = CoNvert. FromBase64String (text);            MemoryStream stream = new MemoryStream ();    &N Bsp       CryptoStream stream2 = new CryptoStream (stream, managed. CreateDecryptor (bytes, s_bytkey), CryptoStreamMode.Write);            STREAM2. Write (buffer, 0, buffer. Length);            STREAM2. FlushFinalBlock ();            Encoding Encoding = new UTF8Encoding ();      &N Bsp     return encoding. GetString (stream. ToArray ());       }       //<summary>       ///Crypto & nbsp      //</summary>       //<param name= "text" ></param>  &N Bsp    //<param name= "key" ></param>       //<returns></returns>         public static string GetbYKey (string text, string key)         {            byte[] bytes = Encodin G.utf8. GetBytes (text);            byte[] RgbKey = Encoding.UTF8.GetBytes ( Dscf.Global.Common.Common.DisposeId (key));            RijndaelManaged managed = new RijndaelManaged ();            MemoryStream stream = new MemoryStream ();            CryptoStream stream2 = new CryptoStream (stream, managed. CreateEncryptor (RgbKey, S_bytkey), CryptoStreamMode.Write);            STREAM2. Write (bytes, 0, bytes. Length);            STREAM2. FlushFinalBlock ();            return convert.tobase64string (stream. ToArray ());       }       //<summary>       //Processing I D, convert to crypto key       //</summary>       //<param name= "id" ></param>       //<returns>& lt;/returns>        public static string Disposeid (String id)         {  &N Bsp         String strvalue = "";            for (int i = 0; I < 9-id. Length; i++)             {                strvalue + i;&nbsp ;          }            return ID. ToString () + strvalue;       }        #endregion    }

C # encryption algorithm