1 /* 2 * Copyright (C) 2009 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 17 package com.android.certinstaller; 18 19 import android.util.Log; 20 21 import java.io.ByteArrayInputStream; 22 import java.io.ByteArrayOutputStream; 23 import java.io.File; 24 import java.io.FileInputStream; 25 import java.io.ObjectInputStream; 26 import java.io.ObjectOutputStream; 27 import java.security.MessageDigest; 28 import java.security.NoSuchAlgorithmException; 29 30 class Util { 31 private static final String TAG = "certinstaller.Util"; 32 33 public static final String SETTINGS_PACKAGE = "com.android.settings"; 34 35 static byte[] toBytes(Object object) { 36 ByteArrayOutputStream baos = new ByteArrayOutputStream(); 37 try { 38 ObjectOutputStream os = new ObjectOutputStream(baos); 39 os.writeObject(object); 40 os.close(); 41 } catch (Exception e) { 42 Log.w(TAG, "toBytes(): " + e + ": " + object); 43 } 44 return baos.toByteArray(); 45 } 46 47 static <T> T fromBytes(byte[] bytes) { 48 if (bytes == null) return null; 49 try { 50 ObjectInputStream is = 51 new ObjectInputStream(new ByteArrayInputStream(bytes)); 52 return (T) is.readObject(); 53 } catch (Exception e) { 54 Log.w(TAG, "fromBytes(): " + e); 55 return null; 56 } 57 } 58 59 static String toMd5(byte[] bytes) { 60 try { 61 MessageDigest algorithm = MessageDigest.getInstance("MD5"); 62 algorithm.reset(); 63 algorithm.update(bytes); 64 return toHexString(algorithm.digest(), ""); 65 } catch(NoSuchAlgorithmException e){ 66 // should not occur 67 Log.w(TAG, "toMd5(): " + e); 68 throw new RuntimeException(e); 69 } 70 } 71 72 private static String toHexString(byte[] bytes, String separator) { 73 StringBuilder hexString = new StringBuilder(); 74 for (byte b : bytes) { 75 hexString.append(Integer.toHexString(0xFF & b)).append(separator); 76 } 77 return hexString.toString(); 78 } 79 80 static byte[] readFile(File file) { 81 try { 82 byte[] data = new byte[(int) file.length()]; 83 FileInputStream fis = new FileInputStream(file); 84 fis.read(data); 85 fis.close(); 86 return data; 87 } catch (Exception e) { 88 Log.w(TAG, "cert file read error: " + e); 89 return null; 90 } 91 } 92 93 static boolean deleteFile(File file) { 94 if ((file != null) && !file.delete()) { 95 Log.w(TAG, "cannot delete cert: " + file); 96 return false; 97 } else { 98 return true; 99 } 100 } 101 102 private Util() { 103 } 104 } 105
