March 6, 2012

FIPS 180-4 published

NIST published FIPS 180-4 Secure Hash Standard (SHS).

The updates from FIPS 180-3 are listed in Appendix C of the new FIPS 180-4 publication.  In short, the changes are:
  1. FIPS 180-4 relaxes the padding restriction described in FIPS 180-3
  2. SHA-512/224 and SHA-512/256 were added to the standard


  1. A clarification from InfoGard's Algorithm Testing Lead:

    I just wanted to clarify that FIPS 180-4 has not yet been added to FIPS 140-2 Annex A nor does the CAVS tool support it. I expect that an update will come from the CMVP/CAVP soon. Until that time, FIPS 180-3 is still the SHA standard that is “FIPS Approved”.

  2. Update: FIPS 180-4 has been added to FIPS 140-2 Annex A and the CAVS tool supports testing.

    Link to Annex A: