Method __builtin.Nettle.Hash()->HKDF()->create() Method create __builtin.Nettle.Hash.HKDF __builtin.Nettle.Hash.HKDF(string(8bit) password, string(8bit)|void salt) Description Initializes the HKDF object with a RFC 5869 2.2 HKDF-Extract(salt, IKM) call.