WhisperSystems/TextSecure-iOS — pull request #40 by nabla-c0d3 (2013-12-10 06:33:32+00:00)
Title: Add HKDF methods

This pull request creates the TSHKDF class which implements the HMAC-based Extract-and-Expand Key Derivation Function (HKDF) needed for the TextSecure protocol v2, as well as corresponding unit tests. Let me know if you have any questions!