RS algorithm encoding part mismatch signature.

[lolgear]

New Issue Checklist

• [x] I have read and understood the CONTRIBUTING guide
• [x] I have read the Documentation
• [x] I have searched for a similar issue in the project and found none

Issue Info

Info	Value
Platform Name	e.g. ios / osx / tvos / watchos
Platform Version	e.g. 8.0
CocoaLumberjack Version	e.g. 2.3.0
Integration Method	e.g. carthage / cocoapods / manually
Xcode Version	e.g. Xcode 7.3
Repro rate	e.g. all the time (100%) / sometimes x% / only once
Demo project link	e.g. link to a demo project that highlights the issue

Issue Description and Steps

Curiously:

RS Algorithm generates different signature on existing test data while encoding. However, decoding part works smoothly.

[lolgear]

https://github.com/yourkarma/JWT/commit/7cc43d817522b5e37455ccca35c9c2f9084acfea

commit hides broken test :(