issue #107 Add method KeyRingInfo.isFullyEncrypted()

pgpainless-core/src/main/java/org/pgpainless/key/info/KeyRingInfo.java

@@ -314,6 +314,25 @@ public class KeyRingInfo {
         return true;
     }
 
+    /**
+     * Returns true when every secret key on the key ring is encrypted.
+     * If there is at least one not encrypted secret key on the ring, return false.
+     * If the ring is a {@link PGPPublicKeyRing}, return false.
+     *
+     * @return true if all secret keys are encrypted.
+     */
+    public boolean isFullyEncrypted() {
+        if (isSecretKey()) {
+            for (PGPSecretKey secretKey : getSecretKeys()) {
+                if (secretKey.getS2KUsage() == 0) {
+                    return false;
+                }
+            }
+            return true;
+        }
+        return false;
+    }
+
     public List<PGPSignature> getSelfSignaturesOnKey(long subkeyId) {
         PGPPublicKey publicKey = KeyRingUtils.requirePublicKeyFrom(keys, subkeyId);
         Iterator<PGPSignature> it = publicKey.getSignaturesForKeyID(keys.getPublicKey().getKeyID());

pgpainless-core/src/test/java/org/pgpainless/key/info/KeyRingInfoTest.java

@@ -89,16 +89,34 @@ public class KeyRingInfoTest {
 
         assertTrue(info.isFullyDecrypted());
 
-        secretKeys = PGPainless.modifyKeyRing(secretKeys)
+        secretKeys = encryptSecretKeys(secretKeys);
-                .changePassphraseFromOldPassphrase(null)
-                .withSecureDefaultSettings()
-                .toNewPassphrase(Passphrase.fromPassword("sw0rdf1sh"))
-                .done();
         info = PGPainless.inspectKeyRing(secretKeys);
 
         assertFalse(info.isFullyDecrypted());
     }
 
+    @Test
+    public void testIsFullyEncrypted() throws IOException, PGPException {
+        PGPSecretKeyRing secretKeys = TestKeys.getEmilSecretKeyRing();
+        KeyRingInfo info = PGPainless.inspectKeyRing(secretKeys);
+
+        assertFalse(info.isFullyEncrypted());
+
+        secretKeys = encryptSecretKeys(secretKeys);
+        info = PGPainless.inspectKeyRing(secretKeys);
+
+        assertTrue(info.isFullyEncrypted());
+    }
+
+    private static PGPSecretKeyRing encryptSecretKeys(PGPSecretKeyRing secretKeys) throws PGPException {
+        return PGPainless.modifyKeyRing(secretKeys)
+                .changePassphraseFromOldPassphrase(null)
+                .withSecureDefaultSettings()
+                .toNewPassphrase(Passphrase.fromPassword("sw0rdf1sh"))
+                .done();
+    }
+
+
     @Test
     public void testGetSecretKey() throws IOException, PGPException {
         PGPSecretKeyRing secretKeys = TestKeys.getCryptieSecretKeyRing();