package hacl-star

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package hacl-star
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Portable C implementation of HKDF using SHA2-256

Buffers have the following size constraints with respect to the digest size of the underlying hash function, digest_len:

  • prk: = digest_len
  • okm: <= 255 * digest_len
type bytes = SharedDefs.CBytes.t
val extract : salt:bytes -> ikm:bytes -> bytes

extract salt ikm computes a pseudorandom key using input key material ikm and salt salt.

val expand : prk:bytes -> info:bytes -> size:int -> bytes

expand prk info size expands the pseudorandom key prk, taking the info string info into account and returns a buffer of size bytes.

module Noalloc : sig ... end

Versions of these functions which write their output in a buffer passed in as an argument