Allow parsing encrypted data without prepended encrypted session keys

Author: vanitasvitae

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

@@ -135,6 +135,9 @@ public Object nextObject()
             return new PGPLiteralData(in);
         case PacketTags.PUBLIC_KEY_ENC_SESSION:
         case PacketTags.SYMMETRIC_KEY_ENC_SESSION:
+        case PacketTags.SYMMETRIC_KEY_ENC:
+        case PacketTags.SYM_ENC_INTEGRITY_PRO:
+        case PacketTags.AEAD_ENC_DATA:
             return new PGPEncryptedDataList(in);
         case PacketTags.ONE_PASS_SIGNATURE:
             l = new ArrayList();