Module hkdf 

Enums

HkdfError

Functions

derive_key

One-shot extract-then-expand.

expand

Expand step: OKM = T(1) || T(2) || ..., where T(i) = HMAC-Hash(PRK, T(i-1) || info || i).

extract

Extract step: PRK = HMAC-Hash(salt, IKM).