8312383: Log X509ExtendedKeyManager implementation class name in TLS/SSL connection

Backport-of: bdd1aebea379b63ae405827074530ef8e8a7c239

Author: Andrew Lu

src/java.base/share/classes/sun/security/ssl/X509Authentication.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2018, 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
@@ -203,6 +203,10 @@ public static SSLPossession createPossession(
     private static SSLPossession createClientPossession(
             ClientHandshakeContext chc, String[] keyTypes) {
         X509ExtendedKeyManager km = chc.sslContext.getX509KeyManager();
+        if (SSLLogger.isOn && SSLLogger.isOn("ssl")) {
+            SSLLogger.finest("X509KeyManager class: " +
+                    km.getClass().getName());
+        }
         String clientAlias = null;
         if (chc.conContext.transport instanceof SSLSocketImpl socket) {
             clientAlias = km.chooseClientAlias(
@@ -272,6 +276,10 @@ private static SSLPossession createClientPossession(
     private static SSLPossession createServerPossession(
             ServerHandshakeContext shc, String[] keyTypes) {
         X509ExtendedKeyManager km = shc.sslContext.getX509KeyManager();
+        if (SSLLogger.isOn && SSLLogger.isOn("ssl")) {
+            SSLLogger.finest("X509KeyManager class: " +
+                    km.getClass().getName());
+        }
         String serverAlias = null;
         for (String keyType : keyTypes) {
             if (shc.conContext.transport instanceof SSLSocketImpl socket) {