POC of replacing boringcrypto with Go's native FIPS-140-3 module

[mjlshen]

[!WARNING]
Disclaimer: How boilerplate sets up FIPS compliance should definitely follow Red Hat guidelines. I don't know what they are. I am just making this MR to raise awareness of this configuration and its brief history.

• GOEXPERIMENT=boringcrypto + the "crypto/tls/fipsonly" library, which required CGO_ENABLED=1 was initially used. The cgo requirement necessitated a swap from ubi*-micro --> ubi*-minimal images.
• Then there was GOEXPERIMENT=strictfipsruntime, added in https://github.com/openshift/boilerplate/pull/298 when Red Hat was supporting an internal fork of Go, this was deprecated and removed in https://github.com/openshift/boilerplate/pull/516
• Nowadays, Go natively supports FIPS starting in Go 1.24 (without requiring cgo!) with borincrypto slated to be removed in a future release. Boilerplate was already updated for Go 1.24 in https://github.com/openshift/boilerplate/pull/582

I think this makes FIPS compliance easier than ever - especially the removal of the cgo requirement should allow usage of ubi*-micro images again if there's a desire for that (fewer CVEs to manage!).

[openshift-ci[bot]]

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[mjlshen]

/hold

This shouldn't be merged. It should be worked on internally if important.

[joshbranham]

This is blocked internally for HCM security to confirm that FIPS-140-3 is good to go. I will follow up with them.

[tonytheleg]

I asked about this a long time ago when the blog first dropped, so it may not be valid information anymore. As I understand it, the FIPS in native Go is still "In process" and is not fully "approved" so there may be some legal/compliance-y back and forth on what that means. +1 to definitely discussing with internal compliance/security teams + the FIPS folks before any major changes. Lately I've been using go-toolset (installed via package manager) for FIPS builds which is essentially Red Hat's fork of Go with all the OpenSSL bits to ensure FIPS compliance.