more attachment stuff
First commit for TSHKDF
Use NSData for info arg and pass the proper salt to extract()
Fix expand() to pass RFC 5869 test cases
Sanity checks on arguments
Add comments
Expose HKDF constants for unit testing
Add unit tests
Fix invalid free() calls triggered by garbage collection
Additional checks on arguments
Return nil if malloc() failed
Add unit tests target
missing free()
Merge branch 'cryptowrapper' of https://github.com/nabla-c0d3/TextSecure-iOS
Merging nabla's cryptowrapper beginnings