docs: public Set<OpenPgpV4Fingerprint> getFingerprintsOfKeysWithState(PGPPublicKeyRingCollection publicKeys,
                                                                      OpenPgpTrustStore.Trust trust)
              throws IOException {
          PGPPublicKeyRingCollection keys = getPublicKeysOfTrustState(publicKeys, trust);
          Set<OpenPgpV4Fingerprint> fingerprints = new HashSet<>();
  
          if (keys == null) {
              return fingerprints;
          }
  
          for (PGPPublicKeyRing ring : keys) {
              fingerprints.add(new OpenPgpV4Fingerprint(ring));
          }
  
          return fingerprints;
      }