api: allow caching of sessionKey in OpenPgpDecryptResult

1 files changed, 8 insertions, 3 deletions

diff --git a/OpenKeychain/src/main/java/org/bouncycastle/openpgp/operator/jcajce/CachingDataDecryptorFactory.java b/OpenKeychain/src/main/java/org/bouncycastle/openpgp/operator/jcajce/CachingDataDecryptorFactory.java
index 703af94f4..7679f8486 100644
--- a/OpenKeychain/src/main/java/org/bouncycastle/openpgp/operator/jcajce/CachingDataDecryptorFactory.java
+++ b/OpenKeychain/src/main/java/org/bouncycastle/openpgp/operator/jcajce/CachingDataDecryptorFactory.java
@@ -6,15 +6,16 @@
 
 package org.bouncycastle.openpgp.operator.jcajce;
 
+
+import java.nio.ByteBuffer;
+import java.util.Map;
+
 import org.bouncycastle.jcajce.util.NamedJcaJceHelper;
 import org.bouncycastle.openpgp.PGPException;
 import org.bouncycastle.openpgp.PGPPublicKeyEncryptedData;
 import org.bouncycastle.openpgp.operator.PGPDataDecryptor;
 import org.bouncycastle.openpgp.operator.PublicKeyDataDecryptorFactory;
 
-import java.nio.ByteBuffer;
-import java.util.Map;
-
 public class CachingDataDecryptorFactory implements PublicKeyDataDecryptorFactory
 {
     private final PublicKeyDataDecryptorFactory mWrappedDecryptor;
@@ -59,6 +60,10 @@ public class CachingDataDecryptorFactory implements PublicKeyDataDecryptorFactor
             return mSessionKeyCache.get(bi);
         }
 
+        if (mWrappedDecryptor == null) {
+            throw new IllegalStateException("tried to decrypt without wrapped decryptor, this is a bug!");
+        }
+
         byte[] sessionData = mWrappedDecryptor.recoverSessionData(keyAlgorithm, secKeyData);
         mSessionKeyCache.put(bi, sessionData);
         return sessionData;