This commit removes FIPS 140-2 related code for the following
reasons:
- FIPS 140-2 is a compliance, not a security requirement. Being
FIPS 140-2 compliant has no security implication on its own.
From a tech. perspetive, a FIPS 140-2 compliant implementation
is not necessarily secure and a non-FIPS 140-2 compliant implementation
is not necessarily insecure. It depends on the concret design and
crypto primitives/constructions used.
- The boringcrypto branch used to achieve FIPS 140-2 compliance was never
officially supported by the Go team and is now in maintainance mode.
It is replaced by a built-in FIPS 140-3 module. It will be removed
eventually. Ref: https://github.com/golang/go/issues/69536
- FIPS 140-2 modules are no longer re-certified after Sep. 2026.
Ref: https://csrc.nist.gov/projects/cryptographic-module-validation-program
Signed-off-by: Andreas Auernhammer <github@aead.dev>