OpenPGP v3 key: Fix NPE in PGPSignature.encode() for missing subpacket areas

pg/src/main/java/org/bouncycastle/openpgp/PGPSignature.java

@@ -907,7 +907,8 @@ public void encode(
         throws IOException
     {
         // Exportable signatures MUST NOT be exported if forTransfer==true
-        if (forTransfer && (!getHashedSubPackets().isExportable() || !getUnhashedSubPackets().isExportable()))
+        if (forTransfer && ((getHashedSubPackets() != null && !getHashedSubPackets().isExportable()) ||
+                (getUnhashedSubPackets() != null && !getUnhashedSubPackets().isExportable())))
         {
             return;
         }

pg/src/test/java/org/bouncycastle/openpgp/api/test/OpenPGPV3KeyTest.java

@@ -0,0 +1,54 @@
+package org.bouncycastle.openpgp.api.test;
+
+import org.bouncycastle.openpgp.PGPException;
+import org.bouncycastle.openpgp.api.OpenPGPApi;
+import org.bouncycastle.openpgp.api.OpenPGPCertificate;
+import org.bouncycastle.openpgp.api.OpenPGPKey;
+
+import java.io.IOException;
+
+public class OpenPGPV3KeyTest
+        extends APITest
+{
+
+    private static final String V3Key = "-----BEGIN PGP PRIVATE KEY BLOCK-----\n" +
+            "\n" +
+            "lQHYA2JqgDIAAAEEAOYdcIKFQ5ZWBx0D5DKwMMNFcIhFyqmfDJ0v23ehMxOkXN/o\n" +
+            "HO/43+dq6ZqQn0gNw53Tp9no+EmcCYNrZuN0C4Zu8XHSyY6UB+CqzNkz/CwmV10E\n" +
+            "dRDipcG1O6scJyy2MWpuOG67til+o+wOLgEkkVkSW8Bl2oqtzVVP4swtKLRZAAUR\n" +
+            "AAP+JBiyRqt+DYr8GKE85NBX9nlS6DMaxUYgGKgibR5OSVsJjIjNUtG0sNmODjTN\n" +
+            "sPMZqlNln6wS3l7APMWNoStNGc9JG9Puz3eR2W69lPDzhuxuxrHIUBO+3UlEQB/p\n" +
+            "N3NPhnwCjh3OWHSMM6rzsX5ExUv0Z4FypnzvMG1x6GRJDVECAO6PyY8NDHsktMVN\n" +
+            "HAdgC61iIOz+GbLhNGeikuB+DQpSoyckAF0N5reBxRbyjzNZQ7aVvWpxigUp5OdK\n" +
+            "HMK7YcwTAgD275bcqhd+oWHDhyesi6RVswlqGfix48qahf9wOmDkc0nzp8evy/4V\n" +
+            "4Qu5zUJGVzi4aEIbFaAnc5lMD9/ydTNjAf485vh4MDFRd3tPvx9mPrHQgaArCBX8\n" +
+            "9oImPDk0oaKixwSIFzXeg1qZQeLiwv26Fs8gawWsLVZpR4+zZc1nhZlGnrQpSm9o\n" +
+            "biBRLiBTbWl0aCA8MTIzNDUuNjc4OUBjb21wdXNlcnZlLmNvbT6JAJUDBRBiaoAy\n" +
+            "VU/izC0otFkBAYIsBACykJ7s82vqCIKewgLpFuqoVGjlfwn9z+G1oa7vr/GxA/mF\n" +
+            "Dr4E8rZ1ytUFMUCfzy52FfOtDQUVUeOpAraWQ4JfjXkHuDuZcW2VRh2ctT/hVHG7\n" +
+            "1GgOWUBH3EeXASSnFjvUVE39vEjEsidaMxZtMj5jmtieTMB8pSG1QJXPXGoNyQ==\n" +
+            "=p7Lr\n" +
+            "-----END PGP PRIVATE KEY BLOCK-----\n";
+
+    public static void main(String[] args)
+    {
+        runTest(new OpenPGPV3KeyTest());
+    }
+
+    @Override
+    public String getName()
+    {
+        return "OpenPGPV3KeyTest";
+    }
+
+    @Override
+    protected void performTestWith(OpenPGPApi api)
+            throws PGPException, IOException
+    {
+        OpenPGPKey key = api.readKeyOrCertificate().parseKey(V3Key);
+        isNotNull(key.getEncoded());
+
+        OpenPGPCertificate certificate = key.toCertificate();
+        isNotNull(certificate.getEncoded());
+    }
+}