| /* |
| * Copyright (C) 2012 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.jobb; |
| |
| import java.io.UnsupportedEncodingException; |
| import java.security.InvalidKeyException; |
| import java.security.NoSuchAlgorithmException; |
| import java.security.SecureRandom; |
| import java.security.spec.InvalidKeySpecException; |
| |
| import javax.crypto.SecretKeyFactory; |
| import javax.crypto.interfaces.PBEKey; |
| import javax.crypto.spec.PBEKeySpec; |
| |
| public class PBKDF { |
| public static final int SALT_LEN = 8; |
| private static final int ROUNDS = 1024; |
| private static final int KEY_BITS = 128; |
| |
| public static byte[] getKey(String password, byte[] saltBytes) throws InvalidKeyException, NoSuchAlgorithmException, UnsupportedEncodingException { |
| PBEKeySpec pwKey = new PBEKeySpec(password.toCharArray(), saltBytes, ROUNDS, KEY_BITS); |
| SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1"); |
| PBEKey pbeKey; |
| try { |
| pbeKey = (PBEKey) factory.generateSecret(pwKey); |
| byte[] pbkdfKey = pbeKey.getEncoded(); |
| return pbkdfKey; |
| } catch (InvalidKeySpecException e) { |
| e.printStackTrace(); |
| } |
| return null; |
| } |
| |
| public static byte[] getRandomSalt() { |
| SecureRandom random = new SecureRandom(); |
| byte[] saltBytes = new byte[SALT_LEN]; |
| random.nextBytes(saltBytes); |
| return saltBytes; |
| } |
| |
| } |