1 package org.bouncycastle.crypto;
2
3 /*-
4 * ╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲
5 * SNMP Java Client
6 * ჻჻჻჻჻჻
7 * Copyright 2023 Sentry Software, Westhawk
8 * ჻჻჻჻჻჻
9 * This program is free software: you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as
11 * published by the Free Software Foundation, either version 3 of the
12 * License, or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Lesser Public License for more details.
18 *
19 * You should have received a copy of the GNU General Lesser Public
20 * License along with this program. If not, see
21 * <http://www.gnu.org/licenses/lgpl-3.0.html>.
22 * ╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱
23 */
24
25 import java.security.SecureRandom;
26
27 /**
28 * The base class for symmetric, or secret, cipher key generators.
29 */
30 public class CipherKeyGenerator
31 {
32 protected SecureRandom random;
33 protected int strength;
34
35 /**
36 * initialise the key generator.
37 *
38 * @param param the parameters to be used for key generation
39 */
40 public void init(
41 KeyGenerationParameters param)
42 {
43 this.random = param.getRandom();
44 this.strength = (param.getStrength() + 7) / 8;
45 }
46
47 /**
48 * generate a secret key.
49 *
50 * @return a byte array containing the key value.
51 */
52 public byte[] generateKey()
53 {
54 byte[] key = new byte[strength];
55
56 random.nextBytes(key);
57
58 return key;
59 }
60 }