1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
// --- BEGIN COPYRIGHT BLOCK ---
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; version 2 of the License.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// (C) 2007 Red Hat, Inc.
// All rights reserved.
// --- END COPYRIGHT BLOCK ---
package netscape.security.provider;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.KeyFactorySpi;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.interfaces.DSAParams;
import java.security.spec.DSAPrivateKeySpec;
import java.security.spec.DSAPublicKeySpec;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
/**
* This class implements the DSA key factory of the Sun provider.
*
* @author Jan Luehe
*
* @version 1.8, 97/12/10
*
* @since JDK1.2
*/
public class DSAKeyFactory extends KeyFactorySpi {
/**
* Generates a public key object from the provided key specification
* (key material).
*
* @param keySpec the specification (key material) of the public key
*
* @return the public key
*
* @exception InvalidKeySpecException if the given key specification
* is inappropriate for this key factory to produce a public key.
*/
protected PublicKey engineGeneratePublic(KeySpec keySpec)
throws InvalidKeySpecException {
try {
if (keySpec instanceof DSAPublicKeySpec) {
DSAPublicKeySpec dsaPubKeySpec = (DSAPublicKeySpec) keySpec;
return new DSAPublicKey(dsaPubKeySpec.getY(),
dsaPubKeySpec.getP(),
dsaPubKeySpec.getQ(),
dsaPubKeySpec.getG());
} else if (keySpec instanceof X509EncodedKeySpec) {
return new DSAPublicKey(((X509EncodedKeySpec) keySpec).getEncoded());
} else {
throw new InvalidKeySpecException("Inappropriate key specification");
}
} catch (InvalidKeyException e) {
throw new InvalidKeySpecException("Inappropriate key specification: " + e.getMessage());
}
}
/**
* Generates a private key object from the provided key specification
* (key material).
*
* @param keySpec the specification (key material) of the private key
*
* @return the private key
*
* @exception InvalidKeySpecException if the given key specification
* is inappropriate for this key factory to produce a private key.
*/
protected PrivateKey engineGeneratePrivate(KeySpec keySpec)
throws InvalidKeySpecException {
try {
if (keySpec instanceof DSAPrivateKeySpec) {
DSAPrivateKeySpec dsaPrivKeySpec = (DSAPrivateKeySpec) keySpec;
return new DSAPrivateKey(dsaPrivKeySpec.getX(),
dsaPrivKeySpec.getP(),
dsaPrivKeySpec.getQ(),
dsaPrivKeySpec.getG());
} else if (keySpec instanceof PKCS8EncodedKeySpec) {
return new DSAPrivateKey(((PKCS8EncodedKeySpec) keySpec).getEncoded());
} else {
throw new InvalidKeySpecException("Inappropriate key specification");
}
} catch (InvalidKeyException e) {
throw new InvalidKeySpecException("Inappropriate key specification: " + e.getMessage());
}
}
/**
* Returns a specification (key material) of the given key object
* in the requested format.
*
* @param key the key
*
* @param keySpec the requested format in which the key material shall be
* returned
*
* @return the underlying key specification (key material) in the
* requested format
*
* @exception InvalidKeySpecException if the requested key specification is
* inappropriate for the given key, or the given key cannot be processed
* (e.g., the given key has an unrecognized algorithm or format).
*/
@SuppressWarnings("unchecked")
protected <T extends KeySpec> T engineGetKeySpec(Key key, Class<T> keySpec)
throws InvalidKeySpecException {
DSAParams params;
try {
if (key instanceof java.security.interfaces.DSAPublicKey) {
// Determine valid key specs
Class<?> dsaPubKeySpec = Class.forName
("java.security.spec.DSAPublicKeySpec");
Class<?> x509KeySpec = Class.forName
("java.security.spec.X509EncodedKeySpec");
if (dsaPubKeySpec.isAssignableFrom(keySpec)) {
java.security.interfaces.DSAPublicKey dsaPubKey = (java.security.interfaces.DSAPublicKey) key;
params = dsaPubKey.getParams();
return (T) new DSAPublicKeySpec(dsaPubKey.getY(),
params.getP(),
params.getQ(),
params.getG());
} else if (x509KeySpec.isAssignableFrom(keySpec)) {
return (T) new X509EncodedKeySpec(key.getEncoded());
} else {
throw new InvalidKeySpecException("Inappropriate key specification");
}
} else if (key instanceof java.security.interfaces.DSAPrivateKey) {
// Determine valid key specs
Class<?> dsaPrivKeySpec = Class.forName
("java.security.spec.DSAPrivateKeySpec");
Class<?> pkcs8KeySpec = Class.forName
("java.security.spec.PKCS8EncodedKeySpec");
if (dsaPrivKeySpec.isAssignableFrom(keySpec)) {
java.security.interfaces.DSAPrivateKey dsaPrivKey = (java.security.interfaces.DSAPrivateKey) key;
params = dsaPrivKey.getParams();
return (T) new DSAPrivateKeySpec(dsaPrivKey.getX(),
params.getP(),
params.getQ(),
params.getG());
} else if (pkcs8KeySpec.isAssignableFrom(keySpec)) {
return (T) new PKCS8EncodedKeySpec(key.getEncoded());
} else {
throw new InvalidKeySpecException("Inappropriate key specification");
}
} else {
throw new InvalidKeySpecException("Inappropriate key type");
}
} catch (ClassNotFoundException e) {
throw new InvalidKeySpecException("Unsupported key specification: " + e.getMessage());
}
}
/**
* Translates a key object, whose provider may be unknown or potentially
* untrusted, into a corresponding key object of this key factory.
*
* @param key the key whose provider is unknown or untrusted
*
* @return the translated key
*
* @exception InvalidKeyException if the given key cannot be processed by
* this key factory.
*/
protected Key engineTranslateKey(Key key) throws InvalidKeyException {
try {
if (key instanceof java.security.interfaces.DSAPublicKey) {
// Check if key originates from this factory
if (key instanceof netscape.security.provider.DSAPublicKey) {
return key;
}
// Convert key to spec
DSAPublicKeySpec dsaPubKeySpec = engineGetKeySpec(key, DSAPublicKeySpec.class);
// Create key from spec, and return it
return engineGeneratePublic(dsaPubKeySpec);
} else if (key instanceof java.security.interfaces.DSAPrivateKey) {
// Check if key originates from this factory
if (key instanceof netscape.security.provider.DSAPrivateKey) {
return key;
}
// Convert key to spec
DSAPrivateKeySpec dsaPrivKeySpec = engineGetKeySpec(key, DSAPrivateKeySpec.class);
// Create key from spec, and return it
return engineGeneratePrivate(dsaPrivKeySpec);
} else {
throw new InvalidKeyException("Wrong algorithm type");
}
} catch (InvalidKeySpecException e) {
throw new InvalidKeyException("Cannot translate key: "
+ e.getMessage());
}
}
}
|
