HMAC-based Extract-and-Expand Key Derivation Function
RFC 5869, “HMAC-based Extract-and-Expand Key Derivation Function”, is an Informational document published in May 2010 by H. Krawczyk, P. Eronen. The canonical text is published by the RFC Editor.
Abstract
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. This document is not an Internet Standards Track specification; it is published for informational purposes.
What “Informational” means
Published for the general information of the community. It does not define an IETF standard and carries no standards-track status.
The canonical text of RFC 5869 is hosted at rfc-editor.org. Available in TXT,HTML.
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