mozilla/pdf.js — pull request #4938 by yurydelendik (2014-06-13 20:18:09+00:00)
Title: Added support for decrypting PDF 1.7/2.0 Algorithm 5 revision 5 and 6. (perf)

See #4647. Refactors SHA512, so unit testing time reduced from 9848ms to 1382ms.