%% You should probably cite rfc6234 instead of this I-D.
@techreport{eastlake-sha2b-07,
    number =    {draft-eastlake-sha2b-07},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-eastlake-sha2b/07/},
    author =    {Tony Hansen and Donald E. Eastlake 3rd},
    title =     {{US Secure Hash Algorithms (SHA and SHA-based HMAC and HKDF)}},
    pagetotal = 127,
    year =      2011,
    month =     feb,
    day =       15,
    abstract =  {Federal Information Processing Standard, FIPS},
}