content: /*
   * Copyright (C) 2018 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.backup.encryption.keys;
  
  import static com.google.common.truth.Truth.assertThat;
  
  import android.platform.test.annotations.Presubmit;
  
  import org.junit.Before;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.robolectric.RobolectricTestRunner;
  
  import java.security.SecureRandom;
  
  import javax.crypto.SecretKey;
  
  /** Tests for {@link TertiaryKeyGenerator}. */
  @RunWith(RobolectricTestRunner.class)
  @Presubmit
  public class TertiaryKeyGeneratorTest {
      private static final String KEY_ALGORITHM = "AES";
      private static final int KEY_SIZE_BITS = 256;
  
      private TertiaryKeyGenerator mTertiaryKeyGenerator;
  
      /** Instantiate a new {@link TertiaryKeyGenerator} for use in tests. */
      @Before
      public void setUp() {
          mTertiaryKeyGenerator = new TertiaryKeyGenerator(new SecureRandom());
      }
  
      /** Generated keys should be AES keys. */
      @Test
      public void generate_generatesAESKeys() {
          SecretKey secretKey = mTertiaryKeyGenerator.generate();
  
          assertThat(secretKey.getAlgorithm()).isEqualTo(KEY_ALGORITHM);
      }
  
      /** Generated keys should be 256 bits in size. */
      @Test
      public void generate_generates256BitKeys() {
          SecretKey secretKey = mTertiaryKeyGenerator.generate();
  
          assertThat(secretKey.getEncoded()).hasLength(KEY_SIZE_BITS / 8);
      }
  
      /**
       * Subsequent calls to {@link TertiaryKeyGenerator#generate()} should generate different keys.
       */
      @Test
      public void generate_generatesNewKeys() {
          SecretKey key1 = mTertiaryKeyGenerator.generate();
          SecretKey key2 = mTertiaryKeyGenerator.generate();
  
          assertThat(key1).isNotEqualTo(key2);
      }
  }
  