| /* |
| * 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.chunking; |
| |
| import static com.google.common.truth.Truth.assertThat; |
| |
| import android.platform.test.annotations.Presubmit; |
| |
| import com.android.server.backup.encryption.chunk.ChunkHash; |
| |
| import org.junit.Before; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| import org.robolectric.RobolectricTestRunner; |
| |
| import javax.crypto.Mac; |
| import javax.crypto.SecretKey; |
| import javax.crypto.spec.SecretKeySpec; |
| |
| @RunWith(RobolectricTestRunner.class) |
| @Presubmit |
| public class ChunkHasherTest { |
| private static final String KEY_ALGORITHM = "AES"; |
| private static final String MAC_ALGORITHM = "HmacSHA256"; |
| |
| private static final byte[] TEST_KEY = {100, 120}; |
| private static final byte[] TEST_DATA = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13}; |
| |
| private SecretKey mSecretKey; |
| private ChunkHasher mChunkHasher; |
| |
| @Before |
| public void setUp() throws Exception { |
| mSecretKey = new SecretKeySpec(TEST_KEY, KEY_ALGORITHM); |
| mChunkHasher = new ChunkHasher(mSecretKey); |
| } |
| |
| @Test |
| public void computeHash_returnsHmacForData() throws Exception { |
| ChunkHash chunkHash = mChunkHasher.computeHash(TEST_DATA); |
| |
| byte[] hash = chunkHash.getHash(); |
| Mac mac = Mac.getInstance(MAC_ALGORITHM); |
| mac.init(mSecretKey); |
| byte[] expectedHash = mac.doFinal(TEST_DATA); |
| assertThat(hash).isEqualTo(expectedHash); |
| } |
| |
| @Test |
| public void computeHash_generates256BitHmac() throws Exception { |
| int expectedLength = 256 / Byte.SIZE; |
| |
| byte[] hash = mChunkHasher.computeHash(TEST_DATA).getHash(); |
| |
| assertThat(hash).hasLength(expectedLength); |
| } |
| } |