google/K2 — pull request #19 by jmaheswaran (2014-06-30 21:18:43+00:00)
Title: Added HMACKeyVersion, HMACKeyVersionTest, SigningException, HashKeyVersion

Added:
HMACKeyVersion - class representing HMAC
HMACKeyVersionTest - JUnit tests for HMACKeyVersion
SigningException - custom signing exception
HashKeyVersion - abstract class extended by HMACKeyVersion