Peter Gutmann wrote:
[...]  Among other things,
it says that CA root certs aren't subject to any verification (apart from
signature and validity, obviously).

No, the standard doesn't include signature and validity period checking for the trust anchor.

I realize everybody does the validity period checking, and probably most everybody does the signature checking for self-signed certificates used as trust anchors.
But formally the Basic Path Validation algorithm doesn't include those.

Still, you know that it's allowed to use the information inside the trust anchor certificate as additional input to restrict the path validation or initialize the constraints it uses.

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