DO NOT MERGE Add data integrity checking for wifi passwords

Bug: 117994255
Test: DataIntegrityCheckerTests tests good integrity, bad integrity, and
      instances when the intefrity data is unavailable. In addition,
      existing tests pass.

Change-Id: I00a6b30c2172b4e1b11178e0ade9f6861b79fc0c

1 files changed, 84 insertions, 0 deletions

diff --git a/tests/wifitests/src/com/android/server/wifi/util/DataIntegrityCheckerTest.java b/tests/wifitests/src/com/android/server/wifi/util/DataIntegrityCheckerTest.java
new file mode 100644
index 000000000..5e4f6cc0d
--- /dev/null
+++ b/tests/wifitests/src/com/android/server/wifi/util/DataIntegrityCheckerTest.java
@@ -0,0 +1,84 @@
+/*
+ * 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.wifi.util;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+import java.io.File;
+import java.security.DigestException;
+
+/**
+ * Unit tests for {@link com.android.server.wifi.util.DataIntegrityChecker}.
+ */
+public class DataIntegrityCheckerTest {
+    private static byte[] sGoodData = {1, 2, 3, 4};
+    private static byte[] sBadData = {5, 6, 7, 8};
+
+    /**
+     * Verify that updating the integrity token with known data and alias will
+     * pass the integrity test. This test ensure the expected outcome for
+     * unedited data succeeds.
+     *
+     * @throws Exception
+     */
+    @Test
+    public void testIntegrityWithKnownDataAndKnownAlias() throws Exception {
+        File integrityFile = File.createTempFile("testIntegrityWithKnownDataAndKnownAlias",
+                ".tmp");
+        DataIntegrityChecker dataIntegrityChecker = new DataIntegrityChecker(
+                integrityFile.getParent());
+        dataIntegrityChecker.update(sGoodData);
+        assertTrue(dataIntegrityChecker.isOk(sGoodData));
+    }
+
+    /**
+     * Verify that checking the integrity of unknown data and a known alias
+     * will fail the integrity test. This test ensure the expected failure for
+     * altered data, in fact, fails.
+     *
+     *
+     * @throws Exception
+     */
+    @Test
+    public void testIntegrityWithUnknownDataAndKnownAlias() throws Exception {
+        File integrityFile = File.createTempFile("testIntegrityWithUnknownDataAndKnownAlias",
+                ".tmp");
+        DataIntegrityChecker dataIntegrityChecker = new DataIntegrityChecker(
+                integrityFile.getParent());
+        dataIntegrityChecker.update(sGoodData);
+        assertFalse(dataIntegrityChecker.isOk(sBadData));
+    }
+
+    /**
+     * Verify a corner case where integrity of data that has never been
+     * updated passes and adds the token to the keystore.
+     *
+     * @throws Exception
+     */
+    @Test(expected = DigestException.class)
+    public void testIntegrityWithoutUpdate() throws Exception {
+        File tmpFile = File.createTempFile("testIntegrityWithoutUpdate", ".tmp");
+
+        DataIntegrityChecker dataIntegrityChecker = new DataIntegrityChecker(
+                tmpFile.getAbsolutePath());
+
+        // the integrity data is not known, so isOk throws a DigestException
+        assertTrue(dataIntegrityChecker.isOk(sGoodData));
+    }
+}