PyCA cryptography 1.5.3 released

[Paul Kehrer]

PyCA cryptography 1.5.3 has been released to PyPI. cryptography is a
package which provides cryptographic recipes and primitives to Python
developers. Our goal is for it to be your "cryptographic standard library".
We support Python 2.6-2.7, Python 3.3+, and PyPy.

Changelog:

SECURITY ISSUE: Fixed a bug where HKDF would return an empty byte-string if
used with a length less than algorithm.digest_size. Credit to Markus Döring
for reporting the issue.


-Paul Kehrer (reaperhulk)