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HMAC-based Extract-and-Expand Key Derivation Function

Overview#

HMAC-based Extract-and-Expand Key Derivation Function is defined in RFC 5869 which specifies a simple HMAC-based HMAC KDF, named HKDF, which can be used as a building block in various protocols and applications, and is already used in several IETF protocols, including IKEv2, PANA, and EAP-AKA

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