1 files changed, 4 insertions, 2 deletions
diff --git a/luni/src/main/java/org/apache/harmony/crypto/internal/NullCipherSpi.java b/luni/src/main/java/org/apache/harmony/crypto/internal/NullCipherSpi.java
index 270f63b..151b403 100644
--- a/luni/src/main/java/org/apache/harmony/crypto/internal/NullCipherSpi.java
+++ b/luni/src/main/java/org/apache/harmony/crypto/internal/NullCipherSpi.java
@@ -115,8 +115,10 @@ public class NullCipherSpi extends CipherSpi {
     @Override
     public int engineUpdate(ByteBuffer input, ByteBuffer output)
             throws ShortBufferException {
-        if (input == null || output == null) {
-            throw new NullPointerException();
+        if (input == null) {
+            throw new NullPointerException("input == null");
+        } else if (output == null) {
+            throw new NullPointerException("output == null");
         }
         int result = input.limit() - input.position();
         try {