Add AndroidKeyStore provider for KeyStore API

This introduces a public API for the Android keystore that is accessible
via java.security.KeyStore API. This allows programs to store
PrivateKeyEntry and TrustedCertificateEntry items visible only to
themselves.

Future work should include:

* Implement KeyStore.CallbackHandlerProtection parameter to allow the
  caller to request that the keystore daemon unlock itself via the
  system password input dialog.

* Implement SecretKeyEntry once that support is in keystore daemon

Change-Id: I382ffdf742d3f9f7647c5f5a429244a340b6bb0a

keystore/java/android/security/AndroidKeyStoreProvider.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.security;
+
+import java.security.Provider;
+
+/**
+ * A provider focused on providing JCA interfaces for the Android KeyStore.
+ *
+ * @hide
+ */
+public class AndroidKeyStoreProvider extends Provider {
+    public static final String PROVIDER_NAME = "AndroidKeyStoreProvider";
+
+    public AndroidKeyStoreProvider() {
+        super(PROVIDER_NAME, 1.0, "Android KeyStore security provider");
+
+        put("KeyStore." + AndroidKeyStore.NAME, AndroidKeyStore.class.getName());
+    }
+}