C # AES Encryption

Using System.Security.Cryptography;

AES can be called directly

As if only the ECB CBC CFB can be used directly, CTR OFB does not know how to use

    Static classMyaes {Staticpaddingmode[] padding ={PADDINGMODE.PKCS7, paddingmode.ansix923, paddingmode.iso10126, PADDINGM Ode. None, Paddingmode.zeros};//This is the Fill methodStatic  Public stringEncrypt (stringMessage,stringKeystringIV, Ciphermode Mode,intPadintlength) {//plaintext key vector encryption mode fill mode key lengthTry            {                //rijndaelmanaged aes = new RijndaelManaged ();Rijndael AES =rijndael.create (); //AES.                BlockSize = 128; //AES. Feedbacksize =;Aes. KeySize =length; Aes. Padding=Padding[pad]; Aes. Mode=Mode; //AES.                Key = Encoding.UTF8.GetBytes (key); //Aes.iv = Encoding.UTF8.GetBytes (IV);                byte[] Keybytes =Encoding.UTF8.GetBytes (key); byte[] Keyiv =Encoding.UTF8.GetBytes (IV); byte[] Inputbytearray =Encoding.UTF8.GetBytes (Message); MemoryStream Memstream=NewMemoryStream (); CryptoStream Crypstream=NewCryptoStream (Memstream, AES.                CreateEncryptor (Keybytes, Keyiv), cryptostreammode.write); Crypstream.write (Inputbytearray,0, inputbytearray.length);                Crypstream.flushfinalblock (); Aes.                Clear (); returnconvert.tobase64string (Memstream.toarray ()); }            Catch{MessageBox.Show ("Encryption failed");return ""; } }        //AES Encryption        Static  Public stringDecrypt (stringCiphertext,stringKeystringIV, Ciphermode Mode,intPadintlength) {            Try            {                //rijndaelmanaged aes = new RijndaelManaged ();Rijndael AES =rijndael.create (); //AES.                BlockSize = 128; //AES.                feedbacksize = 128; //AES.                Key = Encoding.UTF8.GetBytes (key); //Aes.iv = Encoding.UTF8.GetBytes (IV);Aes. KeySize =length; Aes. Padding=Padding[pad]; Aes. Mode=Mode; byte[] Keybytes =Encoding.UTF8.GetBytes (key); byte[] Keyiv =Encoding.UTF8.GetBytes (IV); byte[] Outputbytearray =convert.frombase64string (ciphertext); MemoryStream Memstream=NewMemoryStream (); CryptoStream Crypstream=NewCryptoStream (Memstream, AES.                CreateDecryptor (Keybytes, Keyiv), cryptostreammode.write); Crypstream.write (Outputbytearray,0, outputbytearray.length);                Crypstream.flushfinalblock (); Aes.                Clear (); returnEncoding.UTF8.GetString (Memstream.toarray ()); }            Catch{MessageBox.Show ("Encryption failed");return ""; } }        //AES Decryption    }

C # AES Encryption