8225181: KeyStore should have a getAttributes method

src/java.base/share/classes/java/security/KeyStore.java

@@ -1020,6 +1020,34 @@ public final String getType()
         return this.type;
     }
 
+    /**
+     * Retrieves the attributes associated with the given alias.
+     *
+     * @param alias the alias name
+     * @return an unmodifiable {@code Set} of attributes. This set is
+     *      empty if the {@code KeyStoreSpi} implementation has not overridden
+     *      {@link KeyStoreSpi#engineGetAttributes(String)}, or the given
+     *      alias does not exist, or there are no attributes associated
+     *      with the alias. This set may also be empty for
+     *      {@code PrivateKeyEntry} or {@code SecretKeyEntry}
+     *      entries that contain protected attributes and are only available
+     *      through the {@link Entry#getAttributes} method after the entry
+     *      is extracted.
+     *
+     * @throws KeyStoreException if the keystore has not been initialized
+     * (loaded).
+     * @throws NullPointerException if {@code alias} is {@code null}
+     *
+     * @since 18
+     */
+    public final Set<Entry.Attribute> getAttributes(String alias)
+            throws KeyStoreException {
+        if (!initialized) {
+            throw new KeyStoreException("Uninitialized keystore");
+        }
+        return keyStoreSpi.engineGetAttributes(Objects.requireNonNull(alias));
+    }
+
     /**
      * Returns the key associated with the given alias, using the given
      * password to recover it.  The key must have been associated with

src/java.base/share/classes/java/security/KeyStoreSpi.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1998, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 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
@@ -447,6 +447,33 @@ void engineLoad(InputStream stream, KeyStore.LoadStoreParameter param)
         return;
     }
 
+    /**
+     * Retrieves the attributes associated with the given alias.
+     *
+     * @implSpec
+     * The default implementation returns an empty {@code Set}.
+     * {@code KeyStoreSpi} implementations that support attributes
+     * should override this method.
+     *
+     * @param alias the alias name
+     * @return an unmodifiable {@code Set} of attributes. This set is
+     *      empty if the given alias does not exist or there are no
+     *      attributes associated with the alias. This set may also be
+     *      empty for {@code PrivateKeyEntry} or {@code SecretKeyEntry}
+     *      entries that contain protected attributes. These protected
+     *      attributes should be populated into the result returned by
+     *      {@link #engineGetEntry} and can be retrieved by calling
+     *      the {@link Entry#getAttributes} method.
+     *
+     * @throws KeyStoreException if the keystore has not been initialized
+     * (loaded).
+     *
+     * @since 18
+     */
+    public Set<Entry.Attribute> engineGetAttributes(String alias) {
+        return Collections.emptySet();
+    }
+
     /**
      * Gets a {@code KeyStore.Entry} for the specified alias
      * with the specified protection parameter.

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

@@ -1307,6 +1307,15 @@ public synchronized void engineStore(OutputStream stream, char[] password)
         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 @@ public Date engineGetCreationDate(String alias) {
         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 void engineDeleteEntry(String alias) throws KeyStoreException {
         keystore.engineDeleteEntry(alias);
     }
 
+    @Override
+    public Set<KeyStore.Entry.Attribute> engineGetAttributes(String alias) {
+        return keystore.engineGetAttributes(alias);
+    }
+
     @Override
     public Enumeration<String> engineAliases() {
         return keystore.engineAliases();

test/jdk/sun/security/pkcs12/GetAttributes.java

@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 8225181
+ * @summary KeyStore should have a getAttributes method
+ * @library /test/lib
+ * @modules java.base/sun.security.tools.keytool
+ *          java.base/sun.security.x509
+ */
+
+import jdk.test.lib.Asserts;
+import sun.security.tools.keytool.CertAndKeyGen;
+import sun.security.x509.X500Name;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.security.KeyStore;
+import java.security.cert.Certificate;
+
+public class GetAttributes {
+
+    static char[] pass = "changeit".toCharArray();
+
+    public static void main(String[] args) throws Exception {
+
+        // Create a keystore with one private key entry and one cert entry
+        CertAndKeyGen cag = new CertAndKeyGen("EC", "SHA256withECDSA");
+        KeyStore ks = KeyStore.getInstance("pkcs12");
+        ks.load(null, null);
+        cag.generate("secp256r1");
+        ks.setKeyEntry("a", cag.getPrivateKey(), pass, new Certificate[] {
+                cag.getSelfCertificate(new X500Name("CN=a"), 1000)} );
+        cag.generate("secp256r1");
+        ks.setCertificateEntry("b",
+                cag.getSelfCertificate(new X500Name("CN=b"), 1000));
+
+        // Test
+        check(ks);
+
+        // Test newly loaded
+        ByteArrayOutputStream bos = new ByteArrayOutputStream();
+        ks.store(bos, pass);
+        KeyStore ks2 = KeyStore.getInstance("pkcs12");
+        ks2.load(new ByteArrayInputStream(bos.toByteArray()), pass);
+        check(ks2);
+    }
+
+    static void check(KeyStore ks) throws Exception {
+        var entry = ks.getEntry("a", new KeyStore.PasswordProtection(pass));
+        Asserts.assertEQ(ks.getAttributes("a"), entry.getAttributes());
+        entry = ks.getEntry("b", null);
+        Asserts.assertEQ(ks.getAttributes("b"), entry.getAttributes());
+    }
+}