HashCode originHash = fileHasher.hash(origin);
        HashCode signatureHash = fileHasher.hash(signature);
        CacheEntry entry = cache.getIfPresent(cacheKey);
        if (entry == null || entry.updated(originHash, signatureHash) || hasExpired(entry)) {
            entry = performActualVerification(origin, signature, trustedKeys, ignoredKeys, originHash, signatureHash);
            cache.put(cacheKey, entry);
        }