Thanks to Stefan Karlsson for helping with the implementation.
Also add SASLMechanism.checkIfSuccessfulOrThrow(), to increase the
security by verifying the mechanisms state at the end of SASL
authentication.
SASLMechanism now has a SASLPrep StringTransformer.
Refactor SHA1 functions out of StringUtils into SHA1 utility class.
Add MAC utility class.
Make DummyConnection getSentpacket() methods use generics to make unit
testing SCRAM-SHA1 easier.
Fixes SMACK-398
every SASL Mechanism is designed as a byte array based protocol. XMPP
adds the constraint that the challenges and responses are send base64
encoded. It's therefore better API design to let getAuthenticationText()
return byte[] instead of String.
This commit marks an important milestone with the addition of the
smack-android subproject. Smack is now able to run native on Android
without requiring any modifications, which makes the aSmack build
environment obsolete.
It was necessary to redesign the code for SASL authentication to achieve
this. Smack now comes with smack-sasl-provided for SASL implementations
that do not rely on additional APIs like javax for platforms where those
APIs are not available like Android.
