HMAC-based Extract-and-Expand Key Derivation Function (HKDF)
Hugo Krawczyk, Pasi Eronen · 2010
This document specifies a simple Hashed Message Authentication Code (HMAC)-based key derivation function (HKDF), which can be used as a building block in various protocols and applications.The key derivation function (KDF) is intended to support a wide range of applications and requirements, and is conservative in its use of cryptographic hash functions.