The hkdf_erlang application

Authors: Roman Pushkov (pushkovroman@me.com).

HKDF implementation in Erlang. See more at https://tools.ietf.org/html/rfc5869

A key derivation function (KDF) is a basic and essential component of cryptographic systems. Its goal is to take some source of initial keying material and derive from it one or more cryptographically strong secret keys.

HKDF follows the "extract-then-expand" paradigm. The first stage takes the input keying material and "extracts" from it a fixed-length pseudorandom key K. The second stage "expands" the key K into several additional pseudorandom keys (the output of the KDF).

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