Add prepend method

1 files changed, 14 insertions, 0 deletions

diff --git a/core/src/main/java/org/bouncycastle/util/Arrays.java b/core/src/main/java/org/bouncycastle/util/Arrays.java
index 0ae4324b..e4b270fe 100644
--- a/core/src/main/java/org/bouncycastle/util/Arrays.java
+++ b/core/src/main/java/org/bouncycastle/util/Arrays.java
@@ -813,4 +813,18 @@ public final class Arrays
             return concatenate(b, c, d);
         }
     }
+
+    public static byte[] prepend(byte[] a, byte b)
+    {
+        if (a == null)
+        {
+            return new byte[]{ b };
+        }
+
+        int length = a.length;
+        byte[] result = new byte[length + 1];
+        System.arraycopy(a, 0, result, 1, length);
+        result[0] = b;
+        return result;
+    }
 }