1 files changed, 1 insertions, 13 deletions
diff --git a/crypto/src/crypto/modes/OCBBlockCipher.cs b/crypto/src/crypto/modes/OCBBlockCipher.cs
index 604a7d205..a7facaa04 100644
--- a/crypto/src/crypto/modes/OCBBlockCipher.cs
+++ b/crypto/src/crypto/modes/OCBBlockCipher.cs
@@ -732,19 +732,7 @@ namespace Org.BouncyCastle.Crypto.Modes
 
         protected static int OCB_ntz(long x)
         {
-            if (x == 0)
-            {
-                return 64;
-            }
-
-            int n = 0;
-            ulong ux = (ulong)x;
-            while ((ux & 1UL) == 0UL)
-            {
-                ++n;
-                ux >>= 1;
-            }
-            return n;
+            return Longs.NumberOfTrailingZeros(x);
         }
 
         protected static int ShiftLeft(byte[] block, byte[] output)