1 files changed, 5 insertions, 1 deletions

diff --git a/crypto/src/crypto/modes/GOFBBlockCipher.cs b/crypto/src/crypto/modes/GOFBBlockCipher.cs

index 7db843115..a91562549 100644
--- a/crypto/src/crypto/modes/GOFBBlockCipher.cs
+++ b/crypto/src/crypto/modes/GOFBBlockCipher.cs
@@ -98,7 +98,11 @@ namespace Org.BouncyCastle.Crypto.Modes
 
 			Reset();
 
-			cipher.Init(true, parameters);
+            // if it's null, key is to be reused.
+            if (parameters != null)
+            {
+                cipher.Init(true, parameters);
+            }
 		}
 
 		/**