1 /**
2 * Logback: the reliable, generic, fast and flexible logging framework.
3 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
4 *
5 * This program and the accompanying materials are dual-licensed under
6 * either the terms of the Eclipse Public License v1.0 as published by
7 * the Eclipse Foundation
8 *
9 * or (per the licensee's choosing)
10 *
11 * under the terms of the GNU Lesser General Public License version 2.1
12 * as published by the Free Software Foundation.
13 */
14 package ch.qos.logback.core.net.ssl;
15
16 import java.security.NoSuchAlgorithmException;
17 import java.security.NoSuchProviderException;
18 import java.security.SecureRandom;
19
20 /**
21 * A factory bean for a JCA {@link SecureRandom} generator.
22 * <p>
23 * This object holds the configurable properties of a secure random generator
24 * and uses them to create and load a {@link SecureRandom} instance.
25 *
26 * @author Carl Harris
27 */
28 public class SecureRandomFactoryBean {
29
30 private String algorithm;
31 private String provider;
32
33 /**
34 * Creates a new {@link SecureRandom} generator using the receiver's
35 * configuration.
36 *
37 * @return secure random generator instance
38 * @throws NoSuchProviderException if the provider name specified by
39 * {@link #setProvider(String)} is not known to
40 * the platform
41 * @throws NoSuchAlgorithmException if the algorithm name specified by
42 * {@link #setAlgorithm(String)} is not
43 * recognized by the specified provider (or the
44 * platform's default provider if the provider
45 * isn't specified)
46 */
47 public SecureRandom createSecureRandom() throws NoSuchProviderException, NoSuchAlgorithmException {
48 try {
49 return getProvider() != null ? SecureRandom.getInstance(getAlgorithm(), getProvider())
50 : SecureRandom.getInstance(getAlgorithm());
51 } catch (NoSuchProviderException ex) {
52 throw new NoSuchProviderException("no such secure random provider: " + getProvider());
53 } catch (NoSuchAlgorithmException ex) {
54 throw new NoSuchAlgorithmException("no such secure random algorithm: " + getAlgorithm());
55 }
56 }
57
58 /**
59 * Gets the secure random generator algorithm name.
60 *
61 * @return an algorithm name (e.g. {@code SHA1PRNG}); the
62 * {@link SSL#DEFAULT_SECURE_RANDOM_ALGORITHM} is returned if no
63 * algorithm has been specified
64 */
65 public String getAlgorithm() {
66 if (algorithm == null) {
67 return SSL.DEFAULT_SECURE_RANDOM_ALGORITHM;
68 }
69 return algorithm;
70 }
71
72 /**
73 * Sets the secure random generator algorithm name.
74 *
75 * @param algorithm an algorithm name, which must be recognized by the provider
76 * specified via {@link #setProvider(String)} or by the
77 * platform's default provider if no provider is specified.
78 */
79 public void setAlgorithm(String algorithm) {
80 this.algorithm = algorithm;
81 }
82
83 /**
84 * Gets the JCA provider name for the secure random generator.
85 *
86 * @return provider name
87 */
88 public String getProvider() {
89 return provider;
90 }
91
92 /**
93 * Sets the JCA provider name for the secure random generator.
94 *
95 * @param provider name of the JCA provider to utilize in creating the secure
96 * random generator
97 */
98 public void setProvider(String provider) {
99 this.provider = provider;
100 }
101
102 }