one-step KDFs, defined in SP 800-108 for general purpose use or in SP 800-56C for use on the shared secrets produced by key-agreement schemes; two-step extraction-then-expansion key-derivation procedures, defined in Section 6.3 (extraction) and SP 800-108 (expansion) for general purpose use or again in SP 800-56C for use as part of key-agreement schemes. HKDF-based] TLS 1.3 KDF map to NIST approved standards, namely: SP 800-133rev2 (Section 6.3 Option #3), SP 800-56Crev2, and SP 800-108”. The planned Go FIPS module will test HKDF as SP 800-56Crev2, IG D.P, and SP 800-133, and will Vendor Affirm SP 800-133rev2 support, making it usable everywhere possible.