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