crypto.cs

  public static class Crypto
    {
        public static byte[] GenerateVector(byte[] key)
        {
            using (var aes = Aes.Create())
            {
                aes.Key = key;
                aes.GenerateIV();
                return aes.IV;
            }
        }

        public static byte[] GenerateKey()
        {
            using (var aes = Aes.Create())
            {
                return aes.Key;;
            }
        }

        public static string EncryptBase64(string data, byte[] key, byte[] vector)
        {
            byte[] encrypted;

            using (var aes = Aes.Create())
            {
                aes.Key = key;
                aes.IV = vector;
                var encryptor = aes.CreateEncryptor(aes.Key, aes.IV);

                using (var stream = new MemoryStream())
                {
                    using (var cryptoStream = new CryptoStream(stream, encryptor, CryptoStreamMode.Write))
                    {
                        using (var streamWriter = new StreamWriter(cryptoStream))
                        {
                            streamWriter.Write(data);
                        }
                        encrypted = stream.ToArray();
                    }
                }
            }
            return Convert.ToBase64String(encrypted);
        }

        public static string Decrypt(string data, byte[] key, byte[] vector)
        {
            string result;
            using (var aes = Aes.Create())
            {
                aes.Key = key;
                aes.IV = vector;
                
                var decryptor = aes.CreateDecryptor(aes.Key, aes.IV);
                
                using (var stream = new MemoryStream(Convert.FromBase64String(data)))
                {
                    using (var cryptoStream = new CryptoStream(stream, decryptor, CryptoStreamMode.Read))
                    {
                        using (var streamReader = new StreamReader(cryptoStream))
                        {
                            result = streamReader.ReadToEnd();
                        }
                    }
                }

            }

            return result;
        }
    }