8346285: Update jarsigner compatibility test for change in default digest algorithm

Backport-of: e7d21fcf4949106e89afd413e9abc47d622dd47a

Author: Paul Hohensee

test/jdk/sun/security/tools/jarsigner/compatibility/Compatibility.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2017, 2024, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -67,6 +67,7 @@
 import java.util.stream.Collectors;
 import java.util.stream.IntStream;
 
+import jdk.security.jarsigner.JarSigner;
 import jdk.test.lib.process.OutputAnalyzer;
 import jdk.test.lib.process.ProcessTools;
 import jdk.test.lib.util.JarUtils;
@@ -1430,7 +1431,9 @@ private SignItem digestAlgorithm(String digestAlgorithm) {
         String expectedDigestAlg() {
             return digestAlgorithm != null
                     ? digestAlgorithm
-                    : jdkInfo.majorVersion >= 20 ? "SHA-384" : "SHA-256";
+                    : jdkInfo.majorVersion >= 20
+                        ? JarSigner.Builder.getDefaultDigestAlgorithm()
+                        : "SHA-256";
         }
 
         private SignItem tsaDigestAlgorithm(String tsaDigestAlgorithm) {
@@ -1439,7 +1442,11 @@ private SignItem tsaDigestAlgorithm(String tsaDigestAlgorithm) {
         }
 
         String expectedTsaDigestAlg() {
-            return tsaDigestAlgorithm != null ? tsaDigestAlgorithm : "SHA-256";
+            return tsaDigestAlgorithm != null
+                    ? tsaDigestAlgorithm
+                    : jdkInfo.majorVersion >= 20
+                        ? JarSigner.Builder.getDefaultDigestAlgorithm()
+                        : "SHA-256";
         }
 
         private SignItem tsaIndex(int tsaIndex) {