AES encryption Java to c#

Question

I have the following code which encrypts/decrypts data for me in java

I need to encrypt/decrypt data in C# on a windows phone(8) device and same data should be able

Answer 1

AES encryption can be done on C# as well as on Java, but there are some differences.

Sadly now I remember it quite poor, but native wp7 cryptography had some problems with ciphers. I've written about it here and here. You'd better download BouncyCastle.Crypto library for wp7.

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after downloading that library, try this:

        private char[] keyValue = new char[] { 'S', 'D', 'P', 'i', 'b', 'm', 'B', 'H', 'A', 'R', 'T', 'I', 'P', 'K', 'e', 'y' };
        private char[] keyValue1 = new char[] { 'T', 'h', 'e', 'B', 'e', 's', 't', 'S', 'e', 'c', 'r', 'e', 't', 'K', 'e', 'y' };
        private byte[] key;
        private byte[] key1;

        public AESPage()
        {
            InitializeComponent();
        }

        private void buttonEncrypt_Tap(object sender, System.Windows.Input.GestureEventArgs e)
        {
            key = keyValue.Select(x => Convert.ToByte(x)).ToArray();
            key1 = keyValue1.Select(s => Convert.ToByte(s)).ToArray();

            String password = "encrypt_this";
            String passwordEnc = encrypt(GetBytes(password));
            String passwordDec = decrypt(GetBytes(passwordEnc));
        }

        private String encrypt(byte[] Data)
        {
            IBufferedCipher cipher = CipherUtilities.GetCipher("AES");
            cipher.Init(true, new KeyParameter(key));
            byte[] encVal = cipher.DoFinal(Data);
            MemoryStream memoryStream = new MemoryStream();
            //Encrypt Data 
            memoryStream.Write(encVal, 0, encVal.Length);
            memoryStream.Flush();
            //Return encrypted String 
            byte[] decryptBytes = memoryStream.ToArray();
            return GetString(decryptBytes);
        }

        private String decrypt(byte[] encryptedData)
        {
            IBufferedCipher cipher = CipherUtilities.GetCipher("AES");
            cipher.Init(false, new KeyParameter(key1));
            byte[] decValue = cipher.DoFinal(encryptedData);
            MemoryStream memoryStream = new MemoryStream();
            //Decrypt Data 
            memoryStream.Write(decValue, 0, decValue.Length);
            memoryStream.Flush();
            //Return decrypted String 
            byte[] decryptBytes = memoryStream.ToArray();
            return GetString(decryptBytes);
        }

        private byte[] GetBytes(string str)
        {
            byte[] bytes = new byte[str.Length * sizeof(char)];
            System.Buffer.BlockCopy(str.ToCharArray(), 0, bytes, 0, bytes.Length);
            return bytes;
        }

        private String GetString(byte[] result)
        {
            return System.Text.Encoding.UTF8.GetString(result, 0, result.Length);
        }

I've written this for a simple windows-phone page with single button without writing additional class, like your AESencrp, but I think the idea is clear.