AES128 -TizzyT

    public class AES128 : IDisposable
    {
        public readonly ICryptoTransform Encryptor, Decryptor;

        public AES128()
        {
            using (AesCryptoServiceProvider aes = new AesCryptoServiceProvider())
            {
                aes.GenerateKey();
                aes.GenerateIV();
                aes.Mode = CipherMode.CBC;
                aes.Padding = PaddingMode.None;
                Encryptor = aes.CreateEncryptor();
                Decryptor = aes.CreateDecryptor();
            }
        }

        public AES128(byte[] Parameters)
        {
            if (Parameters?.Length == 32)
            {
                using (AesCryptoServiceProvider aes = new AesCryptoServiceProvider())
                {
                    aes.Key = SubArray(Parameters, 0, 16);
                    aes.IV = SubArray(Parameters, 16, 16);
                    aes.Mode = CipherMode.CBC;
                    aes.Padding = PaddingMode.None;
                    Encryptor = aes.CreateEncryptor();
                    Decryptor = aes.CreateDecryptor();
                }
            }
            else
            {
                throw new ArgumentException("'Parameters' is Invalid, must be a 32 byte array.");
            }
        }

        public byte[] Encrypt(byte[] Data)
        {
            byte[] r = new byte[(int)(Math.Ceiling((Data.Length + 1) / 16.0) * 16)];
            Array.Copy(Data, 0, r, 0, Data.Length);
            r[r.Length - 1] = (byte)(r.Length - Data.Length);
            Encryptor.TransformBlock(r, 0, r.Length, r, 0);
            return r;
        }

        public byte[] Decrypt(byte[] Data)
        {
            byte[] r = (byte[])Data.Clone();
            Decryptor.TransformBlock(r, 0, r.Length, r, 0);
            return SubArray(r, 0, r.Length - r[r.Length - 1]);
        }

        private static byte[] SubArray(byte[] arr, in int offset, in int length)
        {
            byte[] result = new byte[length];
            Array.Copy(arr, offset, result, 0, length);
            return result;
        }

        public void Dispose()
        {
            Encryptor.Dispose();
            Decryptor.Dispose();
        }
    }