[JENKINS-45553] - Cache the Mac so we do not need to constantly recre…

…ate it (#2948) [JENKINS-45553] - Cache the Mac so we do not need to constantly recreate it
jenkinsci · Jul 30, 2017 · 564ca0b · 564ca0b
1 parent 378199f
commit 564ca0b
Showing 1 changed file with 6 additions and 3 deletions.
diff --git a/core/src/main/java/jenkins/security/HMACConfidentialKey.java b/core/src/main/java/jenkins/security/HMACConfidentialKey.java
@@ -27,6 +27,7 @@
  */
 public class HMACConfidentialKey extends ConfidentialKey {
     private volatile SecretKey key;
+    private Mac mac;
     private final int length;
 
     /**
@@ -61,12 +62,14 @@ public HMACConfidentialKey(Class owner, String shortName) {
         this(owner,shortName,Integer.MAX_VALUE);
     }
 
-
     /**
      * Computes the message authentication code for the specified byte sequence.
      */
-    public byte[] mac(byte[] message) {
-        return chop(createMac().doFinal(message));
+    public synchronized byte[] mac(byte[] message) {
+        if (mac == null) {
+            mac = createMac();
+        }
+        return chop(mac.doFinal(message));
     }
 
     /**