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);
        }

          << "s2: " << signatures[j].HumanString();
      EXPECT_EQ(i == j, SignatureHash()(signatures[i]) ==
                            SignatureHash()(signatures[j]))
          << "s1: " << signatures[i].HumanString() << "\n"
          << "s1_hash: " << SignatureHash()(signatures[i]) << "\n"
          << "s2: " << signatures[j].HumanString() << "\n"
          << "s2_hash: " << SignatureHash()(signatures[j]);
    }
  }
}