content: /*
   * Copyright (C) 2017 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 com.android.server.locksettings.recoverablekeystore;
  
  import java.io.IOException;
  import java.security.cert.CertificateException;
  import java.security.Key;
  import java.security.KeyStore;
  import java.security.KeyStoreException;
  import java.security.NoSuchAlgorithmException;
  import java.security.NoSuchAlgorithmException;
  import java.security.UnrecoverableKeyException;
  
  /**
   * Implementation of {@link KeyStoreProxy} that delegates all method calls to the {@link KeyStore}.
   */
  public class KeyStoreProxyImpl implements KeyStoreProxy {
  
      private static final String ANDROID_KEY_STORE_PROVIDER = "AndroidKeyStore";
      private final KeyStore mKeyStore;
  
      /**
       * A new instance, delegating to {@code keyStore}.
       */
      public KeyStoreProxyImpl(KeyStore keyStore) {
          mKeyStore = keyStore;
      }
  
      @Override
      public boolean containsAlias(String alias) throws KeyStoreException {
          return mKeyStore.containsAlias(alias);
      }
  
      @Override
      public Key getKey(String alias, char[] password)
              throws KeyStoreException, NoSuchAlgorithmException, UnrecoverableKeyException {
          return mKeyStore.getKey(alias, password);
      }
  
      @Override
      public void setEntry(String alias, KeyStore.Entry entry, KeyStore.ProtectionParameter protParam)
              throws KeyStoreException {
          mKeyStore.setEntry(alias, entry, protParam);
      }
  
      @Override
      public void deleteEntry(String alias) throws KeyStoreException {
          mKeyStore.deleteEntry(alias);
      }
  
      /**
       * Returns AndroidKeyStore-provided {@link KeyStore}, having already invoked
       * {@link KeyStore#load(KeyStore.LoadStoreParameter)}.
       *
       * @throws KeyStoreException if there was a problem getting or initializing the key store.
       */
      public static KeyStore getAndLoadAndroidKeyStore() throws KeyStoreException {
          KeyStore keyStore = KeyStore.getInstance(ANDROID_KEY_STORE_PROVIDER);
          try {
              keyStore.load(/*param=*/ null);
          } catch (CertificateException | IOException | NoSuchAlgorithmException e) {
              // Should never happen.
              throw new KeyStoreException("Unable to load keystore.", e);
          }
          return keyStore;
      }
  }
  