1 /*
2  * Copyright (C) 2022 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.server.locksettings;
18 
19 import java.security.SecureRandom;
20 
21 /** Utilities using a static SecureRandom */
22 public class SecureRandomUtils {
23     private static final SecureRandom RNG = new SecureRandom();
24 
25     /** Use SecureRandom to generate `length` random bytes */
randomBytes(int length)26     public static byte[] randomBytes(int length) {
27         byte[] res = new byte[length];
28         RNG.nextBytes(res);
29         return res;
30     }
31 
32     /** Use SecureRandom to generate a random long */
randomLong()33     public static long randomLong() {
34         return RNG.nextLong();
35     }
36 }
37