1 files changed, 3 insertions, 1 deletions
diff --git a/core/src/main/java/org/bouncycastle/crypto/engines/HC128Engine.java b/core/src/main/java/org/bouncycastle/crypto/engines/HC128Engine.java
index 015e49e4..7d18d623 100644
--- a/core/src/main/java/org/bouncycastle/crypto/engines/HC128Engine.java
+++ b/core/src/main/java/org/bouncycastle/crypto/engines/HC128Engine.java
@@ -220,7 +220,7 @@ public class HC128Engine
         return ret;
     }
 
-    public void processBytes(byte[] in, int inOff, int len, byte[] out,
+    public int processBytes(byte[] in, int inOff, int len, byte[] out,
                              int outOff) throws DataLengthException
     {
         if (!initialised)
@@ -243,6 +243,8 @@ public class HC128Engine
         {
             out[outOff + i] = (byte)(in[inOff + i] ^ getByte());
         }
+
+        return len;
     }
 
     public void reset()