%% You should probably cite rfc5869 instead of this I-D.
@techreport{krawczyk-hkdf-01,
    number =    {draft-krawczyk-hkdf-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-krawczyk-hkdf/01/},
    author =    {Dr. Hugo Krawczyk and Pasi Eronen},
    title =     {{HMAC-based Extract-and-Expand Key Derivation Function (HKDF)}},
    pagetotal = 14,
    year =      2010,
    month =     jan,
    day =       25,
    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.},
}