pub fn hkdf(
mode: Algorithm,
salt: &[u8],
ikm: &[u8],
info: &[u8],
okm_len: usize,
) -> Result<Vec<u8>, Error>Expand description
HKDF using hash function mode, salt, input key material ikm, info, and output length okm_len.
Calls extract and expand with the given input.
Returns the key material in a vector of length okm_len or Error::OkmLengthTooLarge
if the requested output length is too large.