EncryptAes() private method

Encrypt data using AES RFC3394.
private EncryptAes ( byte data ) : byte[]
data byte Encrypted data.
return byte[]
        /// <summary>
        /// Encrypt data using Key Encrypting Key.
        /// </summary>
        /// <param name="kek">Key Encrypting Key, also known as Master key.</param>
        /// <param name="data">Data to encrypt.</param>
        /// <returns>Encrypt data.</returns>
        public static byte[] Encrypt(byte[] kek, byte[] data)
        {
            if (kek == null)
            {
                throw new ArgumentNullException("Key Encrypting Key");
            }
            if (kek.Length < 16)
            {
                throw new ArgumentOutOfRangeException("Key Encrypting Key");
            }
            if (kek.Length % 8 != 0)
            {
                throw new ArgumentException("Key Encrypting Key");
            }
            GXDLMSChipperingStream gcm = new GXDLMSChipperingStream(true, kek);

            return(gcm.EncryptAes(data));
        }
 /// <summary>
 /// Encrypt data using Key Encrypting Key.
 /// </summary>
 /// <param name="kek">Key Encrypting Key, also known as Master key.</param>
 /// <param name="data">Data to encrypt.</param>
 /// <returns>Encrypt data.</returns>
 public static byte[] Encrypt(byte[] kek, byte[] data)
 {
     if (kek == null)
     {
         throw new ArgumentNullException("Key Encrypting Key");
     }
     if (kek.Length < 16)
     {
         throw new ArgumentOutOfRangeException("Key Encrypting Key");
     }
     if (kek.Length % 8 != 0)
     {
         throw new ArgumentException("Key Encrypting Key");
     }
     GXDLMSChipperingStream gcm = new GXDLMSChipperingStream(true, kek);
     return gcm.EncryptAes(data);
 }