1 /* $Id: Support.java,v 1.5 2000/02/12 15:41:33 gelderen Exp $
2 *
3 * Copyright (C) 1995-1999 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 javax.crypto;
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 /*package*/ final class Support
21 {
22 /*package*/ static Object[]
23 getImplementation(String type, String algorithm)
24 throws NoSuchAlgorithmException
25 {
26 Provider[] providers = Security.getProviders();
27 if( (providers==null) || (providers.length==0) )
28 throw new NoSuchAlgorithmException("No providers installed");
29
30 for(int i=0; i<providers.length; i++)
31 {
32 Object[] res = getImplementation(type, algorithm, providers[i]);
33 if(res != null)
34 return res;
35 }
36
37 throw new NoSuchAlgorithmException(
38 "Algorithm not found. [" + type + "." + algorithm + "]");
39 }
40
41
42 /*package*/ static Object[]
43 getImplementation(String type, String algorithm, String provider)
44 throws NoSuchAlgorithmException, NoSuchProviderException
45 {
46 Provider p = Security.getProvider(provider);
47 if(p==null)
48 throw new NoSuchProviderException(
49 "Provider not found. [" + provider + "]");
50
51 Object[] res = getImplementation(type, algorithm, p);
52 if(res != null)
53 return res;
54
55 throw new NoSuchAlgorithmException(
56 "Algorithm not found. [" + type + "." + algorithm + "]");
57 }
58
59
60 /*package*/ static Object[]
61 getImplementation(String algType, String algName, Provider p)
62 {
63 try
64 {
65 String class_name =
66 p.getProperty("Alg.Alias." + algType + "." + algName);
67
68 if(class_name==null)
69 class_name = p.getProperty(algType + "." + algName);
70 else
71 class_name = p.getProperty(algType + "." + class_name);
72
73 if(class_name == null)
74 return null;
75
76 Object[] res = new Object[2];
77 res[0] = Class.forName(class_name).newInstance();
78 res[1] = p;
79 return res;
80 }
81 catch(LinkageError e)
82 {
83 e.printStackTrace();
84 // FIXME: Throw a RuntimeException with a sensible message????
85 }
86 catch(ClassNotFoundException e)
87 {
88 e.printStackTrace();
89 // FIXME: Throw a RuntimeException with a sensible message????
90 }
91 catch(InstantiationException e)
92 {
93 e.printStackTrace();
94 // FIXME: Throw a RuntimeException with a sensible message????
95 }
96 catch(IllegalAccessException e)
97 {
98 e.printStackTrace();
99 // FIXME: Throw a RuntimeException with a sensible message????
100 }
101
102 return null;
103 }
104
105
106 /*package*/ static String
107 getClassName(String algType, String algName, Provider p)
108 {
109 String class_name =
110 p.getProperty("Alg.Alias." + algType + "." + algName);
111
112 if(class_name==null)
113 class_name = p.getProperty(algType + "." + algName);
114 else
115 class_name = p.getProperty(algType + "." + class_name);
116
117 return class_name;
118 }
119 }
Save This Page