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+++ This bug was initially created as a clone of Bug #2027261 +++

For the FIDO Device Onboarding protocol, we need to use KBKDF (NIST SP800-108) with an R value of 8bits[1].
The version of OpenSSL in RHEL 8.6 and 9 has the OpenSSL implementation, which hardcoded 32-bits.
A patch to make the R value variable has been accepted upstream for OpenSSL 3.0: https://github.com/openssl/openssl/pull/17063

I would like to ask if this patch could get backported to RHEL9 and 8.6 so we can use the OpenSSL implementation of KBKDF in our implementation of the FDO protocol.



[1]: https://fidoalliance.org/specs/FDO/fido-device-onboard-v1.0-ps-20210323/fido-device-onboard-v1.0-ps-20210323.html#kdf - "The counter for each iteration, i, is a single byte (i.e., r = 1)."

One further note: RHEL8 is also missing the UseL parameter, which we also require.

To preserve the existing FIPS 140-2 certification of OpenSSL in RHEL 8, we will not be implementing this change and closing this issue. Modifications except for (a) CVE fixes, (b) adaptions to new FIPS requirements, or (c) changes that do not affect security relevant code would not be accepted for re-certification by NIST. We have determined that this issue does not meet these criteria.