Std.Crypto.Kdf Std.Crypto.Kdf — HKDF-SHA256 key derivation (RFC 5869). Values derive : String -> String -> Int -> Secret -> Result Error Secret `derive salt info length inputKeyMaterial` — extract, then expand: the expand : Secret -> String -> Int -> Result Error Secret `expand pseudorandomKey info length` — HKDF-Expand: `length` bytes of extract : String -> Secret -> Secret `extract salt inputKeyMaterial` — HKDF-Extract: a 32-byte pseudorandom