Merge remote-tracking branch 'remotes/berrange/tags/pull-qcrypto-2016-03-17-3' into...

Merge remote-tracking branch 'remotes/berrange/tags/pull-qcrypto-2016-03-17-3' into staging

Merge QCrypto 2016/03/17 v3

# gpg: Signature made Thu 17 Mar 2016 16:51:32 GMT using RSA key ID 15104FDF
# gpg: Good signature from "Daniel P. Berrange <dan@berrange.com>"
# gpg:                 aka "Daniel P. Berrange <berrange@redhat.com>"

* remotes/berrange/tags/pull-qcrypto-2016-03-17-3:
  crypto: implement the LUKS block encryption format
  crypto: add block encryption framework
  crypto: wire up XTS mode for cipher APIs
  crypto: refactor code for dealing with AES cipher
  crypto: import an implementation of the XTS cipher mode
  crypto: add support for the twofish cipher algorithm
  crypto: add support for the serpent cipher algorithm
  crypto: add support for the cast5-128 cipher algorithm
  crypto: skip testing of unsupported cipher algorithms
  crypto: add support for anti-forensic split algorithm
  crypto: add support for generating initialization vectors
  crypto: add support for PBKDF2 algorithm
  crypto: add cryptographic random byte source

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>