diff --git a/NaCl.net/ArrayExtensions.cs b/NaCl.net/ArrayExtensions.cs
new file mode 100644
index 0000000..8a9a632
--- /dev/null
+++ b/NaCl.net/ArrayExtensions.cs
@@ -0,0 +1,17 @@
+using System;
+using System.Runtime.CompilerServices;
+
+namespace NetMQ.Utils
+{
+    internal static class ArrayExtensions
+    {
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static void Clear<T>(this T[] array)
+        {
+            if (array != null)
+            {
+                Array.Clear(array, 0, array.Length);
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/NaCl.net/Internal/StreamSalsa20.cs b/NaCl.net/Internal/StreamSalsa20.cs
index 6a3274e..f87b8bd 100644
--- a/NaCl.net/Internal/StreamSalsa20.cs
+++ b/NaCl.net/Internal/StreamSalsa20.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Runtime.CompilerServices;
+using NetMQ.Utils;
 
 namespace NaCl.Internal
 {
@@ -48,8 +49,9 @@ static public void Transform(Span<byte> c, ReadOnlySpan<byte> n, ReadOnlySpan<by
             }
             finally
             {
-                Array.Clear(block, 0, block.Length);
-                Array.Clear(kcopy, 0, kcopy.Length);
+                input.Clear();
+                block.Clear();
+                kcopy.Clear();
             }
         }
     }
diff --git a/NaCl.net/Internal/StreamSalsa20Xor.cs b/NaCl.net/Internal/StreamSalsa20Xor.cs
index 7fbe243..f2fa9e3 100644
--- a/NaCl.net/Internal/StreamSalsa20Xor.cs
+++ b/NaCl.net/Internal/StreamSalsa20Xor.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Runtime.CompilerServices;
+using NetMQ.Utils;
 
 namespace NaCl.Internal
 {
@@ -62,8 +63,9 @@ public static void Transform(Span<byte> c, ReadOnlySpan<byte> m, ReadOnlySpan<by
             }
             finally
             {
-                Array.Clear(block, 0, block.Length);
-                Array.Clear(kcopy, 0, kcopy.Length);
+                input.Clear();
+                block.Clear();
+                kcopy.Clear();
             }
         }
     }