AES encryption/decryption

Used only to decrypt some input files.

 FIPS-197 compliant AES implementation

 Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
 SPDX-License-Identifier: Apache-2.0

 Licensed under the Apache License, Version 2.0 (the "License"); you may
 not use this file except in compliance with the License.
 You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0