Add isIntegrityProtected() to PGPEncryptedDataList

Author: vanitasvitae

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

@@ -14,6 +14,7 @@
 import org.bouncycastle.bcpg.Packet;
 import org.bouncycastle.bcpg.PacketTags;
 import org.bouncycastle.bcpg.PublicKeyEncSessionPacket;
+import org.bouncycastle.bcpg.SymmetricEncIntegrityPacket;
 import org.bouncycastle.bcpg.SymmetricKeyEncSessionPacket;
 import org.bouncycastle.bcpg.UnsupportedPacketVersionException;
 import org.bouncycastle.util.Iterable;
@@ -143,6 +144,15 @@ public PGPSessionKeyEncryptedData addSessionKeyDecryptionMethod(PGPSessionKey se
         return sessionKeyEncryptedData;
     }
 
+    /** Checks whether the packet is integrity protected.
+     *
+     * @return <code>true</code> if there is a modification detection code package associated with
+     * this stream
+     */
+    public boolean isIntegrityProtected() {
+        return data instanceof SymmetricEncIntegrityPacket;
+    }
+
     /**
      * Gets the encryption method object at the specified index.
      *