39 |
|
|
40 |
import java.security.spec.KeySpec; |
import java.security.spec.KeySpec; |
41 |
import java.security.spec.InvalidKeySpecException; |
import java.security.spec.InvalidKeySpecException; |
42 |
|
import java.security.NoSuchAlgorithmException; |
43 |
|
|
44 |
/** |
/** |
45 |
* <p>Key factories are used to convert keys (opaque cryptographic keys of type |
* <p>Key factories are used to convert keys (opaque cryptographic keys of type |
123 |
{ |
{ |
124 |
Provider[] p = Security.getProviders(); |
Provider[] p = Security.getProviders(); |
125 |
for (int i = 0; i < p.length; i++) |
for (int i = 0; i < p.length; i++) |
126 |
{ |
try |
127 |
String classname = p[i].getProperty("KeyFactory." + algorithm); |
{ |
128 |
if (classname != null) |
getInstance(algorithm, p[i]); |
129 |
return getInstance(classname, algorithm, p[i]); |
} |
130 |
} |
catch (NoSuchAlgorithmException ignored) {} |
131 |
|
|
132 |
throw new NoSuchAlgorithmException(algorithm); |
throw new NoSuchAlgorithmException(algorithm); |
133 |
} |
} |
154 |
if (p == null) |
if (p == null) |
155 |
throw new NoSuchProviderException(); |
throw new NoSuchProviderException(); |
156 |
|
|
157 |
return getInstance(p.getProperty("KeyFactory." + algorithm), algorithm, p); |
return getInstance(algorithm, p); |
158 |
|
} |
159 |
|
|
160 |
|
/** |
161 |
|
* Generates a <code>KeyFactory</code> object for the specified algorithm from |
162 |
|
* the specified provider. Note: the <code>provider</code> doesn't have to be |
163 |
|
* registered. |
164 |
|
* |
165 |
|
* @param algorithm the name of the requested key algorithm. See Appendix A |
166 |
|
* in the Java Cryptography Architecture API Specification & Reference for |
167 |
|
* information about standard algorithm names. |
168 |
|
* @param provider the provider. |
169 |
|
* @return a <code>KeyFactory</code> object for the specified algorithm. |
170 |
|
* @throws NoSuchAlgorithmException if the algorithm is not available from |
171 |
|
* the specified provider. |
172 |
|
* @throws IllegalArgumentException if the <code>provider</code> is |
173 |
|
* <code>null</code>. |
174 |
|
* @since 1.4 |
175 |
|
* @see Provider |
176 |
|
*/ |
177 |
|
public static KeyFactory getInstance(String algorithm, Provider provider) |
178 |
|
throws NoSuchAlgorithmException |
179 |
|
{ |
180 |
|
if (provider == null) |
181 |
|
throw new IllegalArgumentException(); |
182 |
|
|
183 |
|
// try the name as is |
184 |
|
String className = provider.getProperty("KeyFactory." + algorithm); |
185 |
|
if (className == null) // try all uppercase |
186 |
|
{ |
187 |
|
String upper = algorithm.toUpperCase(); |
188 |
|
className = provider.getProperty("KeyFactory." + upper); |
189 |
|
if (className == null) // try if it's an alias |
190 |
|
{ |
191 |
|
String alias = |
192 |
|
provider.getProperty("Alg.Alias.KeyFactory." + algorithm); |
193 |
|
if (alias == null) // try all-uppercase alias name |
194 |
|
{ |
195 |
|
alias = provider.getProperty("Alg.Alias.KeyFactory." + upper); |
196 |
|
if (alias == null) // spit the dummy |
197 |
|
throw new NoSuchAlgorithmException(algorithm); |
198 |
|
} |
199 |
|
className = provider.getProperty("KeyFactory." + alias); |
200 |
|
if (className == null) |
201 |
|
throw new NoSuchAlgorithmException(algorithm); |
202 |
|
} |
203 |
|
} |
204 |
|
return getInstance(className, algorithm, provider); |
205 |
} |
} |
206 |
|
|
207 |
private static KeyFactory getInstance(String classname, String algorithm, |
private static KeyFactory getInstance(String classname, String algorithm, |