Crypto.KDF.HKDF

Key Derivation Function based on HMAC

See RFC5869

Documentation

data PRK a

Pseudo Random Key

Instances

Eq (PRK a)

Methods

(==) :: PRK a -> PRK a -> Bool

(/=) :: PRK a -> PRK a -> Bool

ByteArrayAccess (PRK a)

Methods

length :: PRK a -> Int

withByteArray :: PRK a -> (Ptr p -> IO a) -> IO a

extract

Arguments

:: (HashAlgorithm a, ByteArrayAccess salt, ByteArrayAccess ikm)

=> salt

Salt

-> ikm

Input Keying Material

-> PRK a

Pseudo random key

Extract a Pseudo Random Key using the parameter and the underlaying hash mechanism

extractSkip :: ByteArrayAccess ikm => ikm -> PRK a

Create a PRK directly from the input key material.

Only use when guaranteed to have a good quality and random data to use directly as key. This effectively skip a HMAC with key=salt and data=key.

expand

Arguments

:: (HashAlgorithm a, ByteArrayAccess info, ByteArray out)

=> PRK a

Pseudo Random Key

-> info

Optional context and application specific information

-> Int

Output length in bytes

-> out

Output data

Expand key material of specific length out of the parameters