crypto: test fips140=only mode

[FiloSottile]

fips140=only from #70123 breaks any non-FIPS cryptography. Testing a mode designed to break things is tricky.

Running the whole test suite is prohibitive. Instead, we should probably write a dedicated test that goes through things that are expected to work, and things that are not expected to work.

[gopherbot]

Change https://go.dev/cl/631018 mentions this issue: crypto: implement fips140=only mode

[gabyhelp]

Related Code Changes

• crypto: implement fips140=only mode

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