MINOR: quic_tls: Add quic_tls_derive_retry_token_secret()

This function must be used to derive strong secrets from a non pseudo-random
secret (cluster-secret setting in our case) and an IV. First it call
quic_hkdf_extract_and_expand() to do that for a temporary strong secret (tmpkey)
then two calls to quic_hkdf_expand() reusing this strong temporary secret
to derive the final strong secret and IV.
2 files changed