BackupUtilsTest.java revision 590096a0e372f640fb41d4cb97d8bc68fb7b8ea2 
1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16package com.android.server.pm.backup;
17
18import android.content.pm.ApplicationInfo;
19import android.content.pm.PackageInfo;
20import android.content.pm.PackageParser.Package;
21import android.content.pm.Signature;
22import android.test.AndroidTestCase;
23import android.test.MoreAsserts;
24import android.test.suitebuilder.annotation.SmallTest;
25
26import com.android.server.backup.BackupUtils;
27
28import java.util.ArrayList;
29import java.util.Arrays;
30
31@SmallTest
32public class BackupUtilsTest extends AndroidTestCase {
33
34    private Signature[] genSignatures(String... signatures) {
35        final Signature[] sigs = new Signature[signatures.length];
36        for (int i = 0; i < signatures.length; i++){
37            sigs[i] = new Signature(signatures[i].getBytes());
38        }
39        return sigs;
40    }
41
42    private PackageInfo genPackage(String... signatures) {
43        final PackageInfo pi = new PackageInfo();
44        pi.packageName = "package";
45        pi.applicationInfo = new ApplicationInfo();
46        pi.signatures = genSignatures(signatures);
47
48        return pi;
49    }
50
51    public void testSignaturesMatch() {
52        final ArrayList<byte[]> stored1 = BackupUtils.hashSignatureArray(Arrays.asList(
53                "abc".getBytes()));
54        final ArrayList<byte[]> stored2 = BackupUtils.hashSignatureArray(Arrays.asList(
55                "abc".getBytes(), "def".getBytes()));
56
57        PackageInfo pi;
58
59        // False for null package.
60        assertFalse(BackupUtils.signaturesMatch(stored1, null));
61
62        // If it's a system app, signatures don't matter.
63        pi = genPackage("xyz");
64        pi.applicationInfo.flags |= ApplicationInfo.FLAG_SYSTEM;
65        assertTrue(BackupUtils.signaturesMatch(stored1, pi));
66
67        // Non system apps.
68        assertTrue(BackupUtils.signaturesMatch(stored1, genPackage("abc")));
69
70        // Superset is okay.
71        assertTrue(BackupUtils.signaturesMatch(stored1, genPackage("abc", "xyz")));
72        assertTrue(BackupUtils.signaturesMatch(stored1, genPackage("xyz", "abc")));
73
74        assertFalse(BackupUtils.signaturesMatch(stored1, genPackage("xyz")));
75        assertFalse(BackupUtils.signaturesMatch(stored1, genPackage("xyz", "def")));
76
77        assertTrue(BackupUtils.signaturesMatch(stored2, genPackage("def", "abc")));
78        assertTrue(BackupUtils.signaturesMatch(stored2, genPackage("x", "def", "abc", "y")));
79
80        // Subset is not okay.
81        assertFalse(BackupUtils.signaturesMatch(stored2, genPackage("abc")));
82        assertFalse(BackupUtils.signaturesMatch(stored2, genPackage("def")));
83    }
84
85    public void testHashSignature() {
86        final byte[] sig1 = "abc".getBytes();
87        final byte[] sig2 = "def".getBytes();
88
89        final byte[] hash1a = BackupUtils.hashSignature(sig1);
90        final byte[] hash1b = BackupUtils.hashSignature(new Signature(sig1));
91
92        final byte[] hash2a = BackupUtils.hashSignature(sig2);
93        final byte[] hash2b = BackupUtils.hashSignature(new Signature(sig2));
94
95        assertEquals(32, hash1a.length);
96        MoreAsserts.assertEquals(hash1a, hash1b);
97
98        assertEquals(32, hash2a.length);
99        MoreAsserts.assertEquals(hash2a, hash2b);
100
101        assertFalse(Arrays.equals(hash1a, hash2a));
102
103        final ArrayList<byte[]> listA = BackupUtils.hashSignatureArray(Arrays.asList(
104                "abc".getBytes(), "def".getBytes()));
105
106        final ArrayList<byte[]> listB = BackupUtils.hashSignatureArray(new Signature[]{
107                new Signature("abc".getBytes()), new Signature("def".getBytes())});
108
109        assertEquals(2, listA.size());
110        assertEquals(2, listB.size());
111
112        MoreAsserts.assertEquals(hash1a, listA.get(0));
113        MoreAsserts.assertEquals(hash1a, listB.get(0));
114
115        MoreAsserts.assertEquals(hash2a, listA.get(1));
116        MoreAsserts.assertEquals(hash2a, listB.get(1));
117    }
118}
119