%% You should probably cite rfc4231 instead of this I-D.
@techreport{nystrom-smime-hmac-sha-02,
    number =    {draft-nystrom-smime-hmac-sha-02},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-nystrom-smime-hmac-sha/02/},
    author =    {Magnus Nyström},
    title =     {{Identifiers and Test Vectors for HMAC-SHA-224, HMAC-SHA-256, HMAC-SHA-384, and HMAC-SHA-512}},
    pagetotal = 9,
    year =      2005,
    month =     jun,
    day =       27,
    abstract =  {This document provides test vectors for the HMAC-SHA-224, HMAC-SHA-256, HMAC-SHA-384, and HMAC-SHA-512 message authentication schemes. It also provides ASN.1 object identifiers and Uniform Resource Identifiers (URIs) to identify use of these schemes in protocols. The test vectors provided in this document may be used for conformance testing. {[}STANDARDS-TRACK{]}},
}