8225181: KeyStore should have a getAttributes method

Reviewed-by: mullan

src/java.base/share/classes/sun/security/pkcs12/PKCS12KeyStore.java

@@ -1307,6 +1307,15 @@ public final class PKCS12KeyStore extends KeyStoreSpi {
         stream.flush();
     }
 
+    @Override
+    public Set<KeyStore.Entry.Attribute> engineGetAttributes(String alias) {
+        if (!engineContainsAlias(alias)) {
+            return super.engineGetAttributes(alias);
+        }
+        Entry entry = entries.get(alias.toLowerCase(Locale.ENGLISH));
+        return getAttributes(entry);
+    }
+
     /**
      * Gets a <code>KeyStore.Entry</code> for the specified alias
      * with the specified protection parameter.

src/java.base/share/classes/sun/security/provider/DomainKeyStore.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 2021, 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
@@ -236,6 +236,28 @@ abstract class DomainKeyStore extends KeyStoreSpi {
         return date;
     }
 
+    @Override
+    public Set<KeyStore.Entry.Attribute> engineGetAttributes(String alias) {
+
+        AbstractMap.SimpleEntry<String, Collection<KeyStore>> pair =
+                getKeystoresForReading(alias);
+        Set<KeyStore.Entry.Attribute> result = Collections.emptySet();
+
+        try {
+            String entryAlias = pair.getKey();
+            for (KeyStore keystore : pair.getValue()) {
+                result = keystore.getAttributes(entryAlias);
+                if (result != null) {
+                    break;
+                }
+            }
+        } catch (KeyStoreException e) {
+            throw new IllegalStateException(e);
+        }
+
+        return result;
+    }
+
     /**
      * Assigns the given private key to the given alias, protecting
      * it with the given password as defined in PKCS8.

src/java.base/share/classes/sun/security/util/KeyStoreDelegator.java

@@ -129,6 +129,11 @@ public class KeyStoreDelegator extends KeyStoreSpi {
         keystore.engineDeleteEntry(alias);
     }
 
+    @Override
+    public Set<KeyStore.Entry.Attribute> engineGetAttributes(String alias) {
+        return keystore.engineGetAttributes(alias);
+    }
+
     @Override
     public Enumeration<String> engineAliases() {
         return keystore.engineAliases();