1 /* $Id: Support.java,v 1.2 2005/03/13 17:47:10 woudt Exp $
2 *
3 * Copyright (C) 1995-2005 The Cryptix Foundation Limited.
4 * All rights reserved.
5 *
6 * Use, modification, copying and distribution of this software is subject
7 * the terms and conditions of the Cryptix General Licence. You should have
8 * received a copy of the Cryptix General Licence along with this library;
9 * if not, you can download a copy from http://www.cryptix.org/ .
10 */
11 package java.security.cert;
12
13
14 import java.security.NoSuchAlgorithmException;
15 import java.security.NoSuchProviderException;
16 import java.security.Provider;
17 import java.security.Security;
18
19
20 /**
21 * Support class for finding implementations of a particular algorithm or format
22 * within a provider.
23 *
24 * <p>Taken from Cryptix JCE, package javax.crypto, cvs file version 1.5.</p>
25 *
26 * @author Jeroen C. van Gelderen <gelderen@cryptix.org>
27 * @author Edwin Woudt <edwin@cryptix.org>
28 */
29 /*package*/ final class Support
30 {
31 /*package*/ static Object[]
32 getImplementation(String type, String algorithm)
33 throws NoSuchAlgorithmException
34 {
35 Provider[] providers = Security.getProviders();
36 if( (providers==null) || (providers.length==0) )
37 throw new NoSuchAlgorithmException("No providers installed");
38
39 for(int i=0; i<providers.length; i++)
40 {
41 try {
42 Object[] res = getImplementation(type, algorithm, providers[i]);
43 return res;
44 } catch (NoSuchAlgorithmException nsae) {
45 // try next
46 }
47 }
48
49 throw new NoSuchAlgorithmException(
50 "Algorithm not found. [" + type + "." + algorithm + "]");
51 }
52
53
54 /*package*/ static Object[]
55 getImplementation(String type, String algorithm, String provider)
56 throws NoSuchAlgorithmException, NoSuchProviderException
57 {
58 Provider p = Security.getProvider(provider);
59 if(p==null)
60 throw new NoSuchProviderException(
61 "Provider not found. [" + provider + "]");
62
63 Object[] res = getImplementation(type, algorithm, p);
64 return res;
65 }
66
67
68 /*package*/ static Object[]
69 getImplementation(String type, String algorithm, Provider provider)
70 throws NoSuchAlgorithmException
71 {
72 try
73 {
74 String class_name =
75 provider.getProperty("Alg.Alias." + type + "." + algorithm);
76
77 if(class_name==null)
78 class_name = provider.getProperty(type + "." + algorithm);
79 else
80 class_name = provider.getProperty(type + "." + class_name);
81
82 if(class_name == null)
83 throw new NoSuchAlgorithmException(
84 "Algorithm not found. [" + type + "." + algorithm + "]");
85
86 Object[] res = new Object[2];
87 res[0] = Class.forName(class_name).newInstance();
88 res[1] = provider;
89 return res;
90 }
91 catch(LinkageError e)
92 {
93 throw new NoSuchAlgorithmException(
94 "Error initializing class. ["+type+"."+algorithm+"]");
95 }
96 catch(ClassNotFoundException e)
97 {
98 throw new NoSuchAlgorithmException(
99 "Registered class not found. ["+type+"."+algorithm+"]");
100 }
101 catch(InstantiationException e)
102 {
103 throw new NoSuchAlgorithmException(
104 "Error initializing class. ["+type+"."+algorithm+"]");
105 }
106 catch(IllegalAccessException e)
107 {
108 throw new NoSuchAlgorithmException(
109 "Error initializing class. ["+type+"."+algorithm+"]");
110 }
111 }
112
113
114
115 /*package*/ static Object[]
116 getClassName(String type, String algorithm)
117 throws NoSuchAlgorithmException
118 {
119 Provider[] providers = Security.getProviders();
120 if( (providers==null) || (providers.length==0) )
121 throw new NoSuchAlgorithmException("No providers installed");
122
123 for(int i=0; i<providers.length; i++)
124 {
125 try {
126 Object[] res = getClassName(type, algorithm, providers[i]);
127 return res;
128 } catch (NoSuchAlgorithmException nsae) {
129 // try next
130 }
131 }
132
133 throw new NoSuchAlgorithmException(
134 "Algorithm not found. [" + type + "." + algorithm + "]");
135 }
136
137
138 /*package*/ static Object[]
139 getClassName(String type, String algorithm, String provider)
140 throws NoSuchAlgorithmException, NoSuchProviderException
141 {
142 Provider p = Security.getProvider(provider);
143 if(p==null)
144 throw new NoSuchProviderException(
145 "Provider not found. [" + provider + "]");
146
147 Object[] res = getClassName(type, algorithm, p);
148 return res;
149 }
150
151
152 /*package*/ static Object[]
153 getClassName(String type, String algorithm, Provider provider)
154 throws NoSuchAlgorithmException
155 {
156 String class_name =
157 provider.getProperty("Alg.Alias." + type + "." + algorithm);
158
159 if(class_name == null)
160 class_name = provider.getProperty(type + "." + algorithm);
161 else
162 class_name = provider.getProperty(type + "." + class_name);
163
164 if(class_name == null)
165 throw new NoSuchAlgorithmException(
166 "Algorithm not found. [" + type + "." + algorithm + "]");
167
168 Object[] res = new Object[2];
169 res[0] = class_name;
170 res[1] = provider;
171 return res;
172 }
173
174 }
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