From 5f81a2d2dfbbef59adf202e75719555095fd8e38 Mon Sep 17 00:00:00 2001
From: Simon Butcher <simon.butcher@arm.com>
Date: Sat, 3 Sep 2016 12:39:38 +0100
Subject: [PATCH] Fix for #441 - crypt and hash gcm (#546)

* Fix crypt_and_hash to support decrypting GCM encrypted files

* Fix documentation in crypt_and_hash for the generic case

* Remove unused lastn from crypt_and_hash

lastn is not used with the cipher layer as it already provides padding
and understanding of length of the original data.

Backport of fix by Paul Bakker.