GH355: Implement HKDF
This patch implements the HMAC-based Extract-and-Expand Key Derivation Function (HKDF) as defined in RFC 5869. It is required to implement the QUIC and TLS 1.3 protocols (among others). Signed-off-by: Rich Salz <rsalz@openssl.org> Reviewed-by: Dr. Stephen Henson <steve@openssl.org>
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