AES and BASE64 Encryption

public class Aeshelper {//<summary>////</summary> Private STA    Tic string Key {get {return ' abcdef1234567890 '; Must be 16-bit}}

       //default key vector          private static byte[] _key1 = {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF, 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF};

       //<summary>        // AES Encryption and Base64 encoding processing        ///</summary>         //<param name= "plaintext" > Clear text string </param>        // <returns> convert encrypted ciphertext to BASE64 encoding to display </returns>         public static String Aesencrypt (string plaintext)         {            //Packet encryption algorithm             SymmetricAlgorithm des = rijndael.create ();             byte[] Inputbytearray = Encoding.UTF8.GetBytes ( plaintext);//Get the byte array to be encrypted            //Set key and key vector              Des. Key = Encoding.UTF8.GetBytes (key);             des.iv = _key1;             byte[] cipherbytes = null;             using (MemoryStream ms = new MemoryStream ())             {                 using (CryptoStream cs = new CryptoStream (MS, Des. CreateEncryptor (), CryptoStreamMode.Write)                  {                     cs. Write (Inputbytearray, 0, inputbytearray.length);                      CS. FlushFinalBlock ();                     cipherBytes = Ms. ToArray ();//Get encrypted byte array                      cs. Close ();                      Ms. Close ();                }             }              return convert.tobase64string (cipherbytes);        }

       //<summary>         //AES decryption and Base64 encoding processing        //</summary>        //<param name= "ciphertext" > Ciphertext string </param>         ///<returns> returns the decrypted plaintext string </returns>          public static string Aesdecrypt (String showtext)         {             byte[] ciphertext = convert.frombase64string (showtext );

            symmetricalgorithm des = rijndael.create ();             des. Key = Encoding.UTF8.GetBytes (key);             des.iv = _key1;             byte[] decryptbytes = new Byte[ciphertext.length ];             using (MemoryStream ms = new MemoryStream ( Ciphertext))             {                 using (CryptoStream cs = new CryptoStream (MS, Des. CreateDecryptor (), CryptoStreamMode.Read)                  {                     Cs. Read (decryptbytes, 0, decryptbytes.length);                      CS. Close ();                      Ms. Close ();                }             }              return Encoding.UTF8.GetString (decryptbytes). Replace ("\", "");  ////rear The string to '/'        }

}

AES and BASE64 Encryption