Function verify_certificates 

pub fn verify_certificates<'a, R, S, D>(
    rng: &mut R,
    scheme: &S,
    certificates: &[(Subject<'a, D>, &'a S::Certificate)],
    strategy: &impl Strategy,
) -> Vec<bool>
where
    R: CryptoRngCore,
    S: Scheme<D>,
    D: Digest,

Batch-verifies certificates and returns a per-item result.

Uses bisection to efficiently identify invalid certificates when batch verification fails.