Dianne Hackborn | 7767eac | 2012-08-23 18:25:40 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 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 | */ |
| 16 | |
Kenny Root | bcc954d | 2011-08-08 16:19:08 -0700 | [diff] [blame] | 17 | package android.content.pm; |
| 18 | |
Jeff Brown | d5a5b5a | 2014-06-05 17:14:39 -0700 | [diff] [blame^] | 19 | import android.annotation.SystemApi; |
Kenny Root | bcc954d | 2011-08-08 16:19:08 -0700 | [diff] [blame] | 20 | import android.os.Parcel; |
| 21 | import android.os.Parcelable; |
Kenny Root | 6c918ce | 2013-04-02 14:04:24 -0700 | [diff] [blame] | 22 | import android.util.Slog; |
Kenny Root | bcc954d | 2011-08-08 16:19:08 -0700 | [diff] [blame] | 23 | |
Kenny Root | 6c918ce | 2013-04-02 14:04:24 -0700 | [diff] [blame] | 24 | import java.io.BufferedInputStream; |
| 25 | import java.io.IOException; |
| 26 | import java.io.InputStream; |
| 27 | import java.security.DigestInputStream; |
| 28 | import java.security.MessageDigest; |
| 29 | import java.security.NoSuchAlgorithmException; |
Kenny Root | bcc954d | 2011-08-08 16:19:08 -0700 | [diff] [blame] | 30 | import java.util.Arrays; |
Kenny Root | 6c918ce | 2013-04-02 14:04:24 -0700 | [diff] [blame] | 31 | |
| 32 | import libcore.io.IoUtils; |
Kenny Root | bcc954d | 2011-08-08 16:19:08 -0700 | [diff] [blame] | 33 | |
| 34 | /** |
| 35 | * Represents the manifest digest for a package. This is suitable for comparison |
| 36 | * of two packages to know whether the manifests are identical. |
| 37 | * |
| 38 | * @hide |
| 39 | */ |
Jeff Brown | d5a5b5a | 2014-06-05 17:14:39 -0700 | [diff] [blame^] | 40 | @SystemApi |
Kenny Root | bcc954d | 2011-08-08 16:19:08 -0700 | [diff] [blame] | 41 | public class ManifestDigest implements Parcelable { |
Kenny Root | 6c918ce | 2013-04-02 14:04:24 -0700 | [diff] [blame] | 42 | private static final String TAG = "ManifestDigest"; |
| 43 | |
Kenny Root | bcc954d | 2011-08-08 16:19:08 -0700 | [diff] [blame] | 44 | /** The digest of the manifest in our preferred order. */ |
| 45 | private final byte[] mDigest; |
| 46 | |
Kenny Root | bcc954d | 2011-08-08 16:19:08 -0700 | [diff] [blame] | 47 | /** What we print out first when toString() is called. */ |
| 48 | private static final String TO_STRING_PREFIX = "ManifestDigest {mDigest="; |
| 49 | |
Kenny Root | 6c918ce | 2013-04-02 14:04:24 -0700 | [diff] [blame] | 50 | /** Digest algorithm to use. */ |
| 51 | private static final String DIGEST_ALGORITHM = "SHA-256"; |
| 52 | |
Kenny Root | bcc954d | 2011-08-08 16:19:08 -0700 | [diff] [blame] | 53 | ManifestDigest(byte[] digest) { |
| 54 | mDigest = digest; |
| 55 | } |
| 56 | |
| 57 | private ManifestDigest(Parcel source) { |
| 58 | mDigest = source.createByteArray(); |
| 59 | } |
| 60 | |
Kenny Root | 6c918ce | 2013-04-02 14:04:24 -0700 | [diff] [blame] | 61 | static ManifestDigest fromInputStream(InputStream fileIs) { |
| 62 | if (fileIs == null) { |
Kenny Root | bcc954d | 2011-08-08 16:19:08 -0700 | [diff] [blame] | 63 | return null; |
| 64 | } |
| 65 | |
Kenny Root | 6c918ce | 2013-04-02 14:04:24 -0700 | [diff] [blame] | 66 | final MessageDigest md; |
| 67 | try { |
| 68 | md = MessageDigest.getInstance(DIGEST_ALGORITHM); |
| 69 | } catch (NoSuchAlgorithmException e) { |
| 70 | throw new RuntimeException(DIGEST_ALGORITHM + " must be available", e); |
| 71 | } |
Kenny Root | bcc954d | 2011-08-08 16:19:08 -0700 | [diff] [blame] | 72 | |
Kenny Root | 6c918ce | 2013-04-02 14:04:24 -0700 | [diff] [blame] | 73 | final DigestInputStream dis = new DigestInputStream(new BufferedInputStream(fileIs), md); |
| 74 | try { |
| 75 | byte[] readBuffer = new byte[8192]; |
| 76 | while (dis.read(readBuffer, 0, readBuffer.length) != -1) { |
| 77 | // not using |
Kenny Root | bcc954d | 2011-08-08 16:19:08 -0700 | [diff] [blame] | 78 | } |
Kenny Root | 6c918ce | 2013-04-02 14:04:24 -0700 | [diff] [blame] | 79 | } catch (IOException e) { |
| 80 | Slog.w(TAG, "Could not read manifest"); |
Kenny Root | bcc954d | 2011-08-08 16:19:08 -0700 | [diff] [blame] | 81 | return null; |
Kenny Root | 6c918ce | 2013-04-02 14:04:24 -0700 | [diff] [blame] | 82 | } finally { |
| 83 | IoUtils.closeQuietly(dis); |
Kenny Root | bcc954d | 2011-08-08 16:19:08 -0700 | [diff] [blame] | 84 | } |
| 85 | |
Kenny Root | 6c918ce | 2013-04-02 14:04:24 -0700 | [diff] [blame] | 86 | final byte[] digest = md.digest(); |
Kenny Root | bcc954d | 2011-08-08 16:19:08 -0700 | [diff] [blame] | 87 | return new ManifestDigest(digest); |
| 88 | } |
| 89 | |
| 90 | @Override |
| 91 | public int describeContents() { |
| 92 | return 0; |
| 93 | } |
| 94 | |
| 95 | @Override |
| 96 | public boolean equals(Object o) { |
| 97 | if (!(o instanceof ManifestDigest)) { |
| 98 | return false; |
| 99 | } |
| 100 | |
| 101 | final ManifestDigest other = (ManifestDigest) o; |
| 102 | |
| 103 | return this == other || Arrays.equals(mDigest, other.mDigest); |
| 104 | } |
| 105 | |
| 106 | @Override |
| 107 | public int hashCode() { |
| 108 | return Arrays.hashCode(mDigest); |
| 109 | } |
| 110 | |
| 111 | @Override |
| 112 | public String toString() { |
| 113 | final StringBuilder sb = new StringBuilder(TO_STRING_PREFIX.length() |
| 114 | + (mDigest.length * 3) + 1); |
| 115 | |
| 116 | sb.append(TO_STRING_PREFIX); |
| 117 | |
| 118 | final int N = mDigest.length; |
| 119 | for (int i = 0; i < N; i++) { |
| 120 | final byte b = mDigest[i]; |
| 121 | IntegralToString.appendByteAsHex(sb, b, false); |
| 122 | sb.append(','); |
| 123 | } |
| 124 | sb.append('}'); |
| 125 | |
| 126 | return sb.toString(); |
| 127 | } |
| 128 | |
| 129 | @Override |
| 130 | public void writeToParcel(Parcel dest, int flags) { |
| 131 | dest.writeByteArray(mDigest); |
| 132 | } |
| 133 | |
| 134 | public static final Parcelable.Creator<ManifestDigest> CREATOR |
| 135 | = new Parcelable.Creator<ManifestDigest>() { |
| 136 | public ManifestDigest createFromParcel(Parcel source) { |
| 137 | return new ManifestDigest(source); |
| 138 | } |
| 139 | |
| 140 | public ManifestDigest[] newArray(int size) { |
| 141 | return new ManifestDigest[size]; |
| 142 | } |
| 143 | }; |
| 144 | |
| 145 | } |