In August 2021, NIST's Crypto Publication Review Board initiated a review process for Federal Information Processing Standard (FIPS) 198-1 The Keyed-Hash Message Authentication Code (HMAC) and received public comments.
In September 2022, the board proposed converting FIPS 198-1 to a NIST Special Publication (SP) and received additional comments on that proposed decision.
NIST has decided to convert FIPS 198-1 to a new Special Publication, NIST SP 800-224, and will revise the text to:
- update the HMAC specification to include block sizes for the SHA-3 family of hash functions,
- include a discussion on truncation, and
- improve the editorial quality and update the references.
FIPS 198-1 will be withdrawn after the new SP is published. Note that the conversion of a FIPS to an SP is not expected to impact the validation process.
The effort to develop NIST SP 800-224 has not yet begun, but it will follow the typical process where a draft is first posted for public comment. Monitor progress on CSRC News and CSRC Publications, and by subscribing to email updates.
