Bug#841983: haskell-cryptonite: Fix alignment of blocks in sha3_update()

[Steve Langasek]

Package: haskell-cryptonite
Version: 0.20-1
Severity: normal
Tags: patch
User: ubuntu-devel at lists.ubuntu.com
Usertags: origin-ubuntu zesty ubuntu-patch

Hi Clint,

In Ubuntu, we've observed a build failure of haskell-cryptonite on armhf
owing to the fact that our armhf builders run on an arm64 kernel which
raises SIGBUS on unaligned access.  While most of the hash implementations
have compatible alignment assumptions, SHA3 uses 64-bit blocks, which
triggers this problem.

Please consider applying the attached patch to the Debian package.

Strangely, it appears that this build failure is unrelated to the build
failure seen on sparc64; so this only benefits users who happen to have the
same set of kernel settings for armhf on Debian.  (It's possible that
skipping the unaligned traps is also a performance benefit, but that's
probably not true on all architectures and I have not tried to measure the
effect.)

Thanks,
-- 
Steve Langasek                   Give me a lever long enough and a Free OS
Debian Developer                   to set it on, and I can move the world.
Ubuntu Developer                                    http://www.debian.org/
slangasek at ubuntu.com                                     vorlon at debian.org
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