computeHkdf
fun computeHkdf(macAlgorithm: String, ikm: ByteArray, salt: ByteArray?, info: ByteArray?, size: Int): ByteArray
Computes an HKDF.
This is based on https://github.com/google/tink/blob/master/java/src/main/java/com/google /crypto/tink/subtle/Hkdf.java which is also Copyright (c) Google and also licensed under the Apache 2 license.
Return
size pseudorandom bytes.
Parameters
macAlgorithm
the MAC algorithm used for computing the Hkdf. I.e., "HMACSHA1" or "HMACSHA256".
ikm
the input keying material.
salt
optional salt. A possibly non-secret random value. If no salt is provided (i.e. if salt has length 0) then an array of 0s of the same size as the hash digest is used as salt.
info
optional context and application specific information.
size
The length of the generated pseudorandom string in bytes. The maximal size is 255.DigestSize, where DigestSize is the size of the underlying HMAC.