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Diffstat (limited to 'libjava/classpath/java/security/AlgorithmParameterGenerator.java')
| -rw-r--r-- | libjava/classpath/java/security/AlgorithmParameterGenerator.java | 277 |
1 files changed, 277 insertions, 0 deletions
diff --git a/libjava/classpath/java/security/AlgorithmParameterGenerator.java b/libjava/classpath/java/security/AlgorithmParameterGenerator.java new file mode 100644 index 000000000..a92552b9e --- /dev/null +++ b/libjava/classpath/java/security/AlgorithmParameterGenerator.java @@ -0,0 +1,277 @@ +/* AlgorithmParameterGenerator.java --- Algorithm Parameter Generator + Copyright (C) 1999, 2003, 2004 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath 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; either version 2, or (at your option) +any later version. + +GNU Classpath 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 GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.security; + +import gnu.java.lang.CPStringBuilder; + +import gnu.java.security.Engine; + +import java.lang.reflect.InvocationTargetException; +import java.security.spec.AlgorithmParameterSpec; + +/** + * <code>AlgorithmParameterGenerator</code> is used to generate algorithm + * parameters for specified algorithms. + * + * <p>In case the client does not explicitly initialize the + * <code>AlgorithmParameterGenerator</code> (via a call to an + * <code>init()</code> method), each provider must supply (and document) a + * default initialization. For example, the <b>GNU</b> provider uses a default + * modulus prime size of <code>1024</code> bits for the generation of <i>DSA</i> + * parameters. + * + * @author Mark Benvenuto + * @since 1.2 + * @see AlgorithmParameters + * @see AlgorithmParameterSpec + */ +public class AlgorithmParameterGenerator +{ + /** Service name for algorithm parameter generators. */ + private static final String ALGORITHM_PARAMETER_GENERATOR = + "AlgorithmParameterGenerator"; + + private AlgorithmParameterGeneratorSpi paramGenSpi; + private Provider provider; + private String algorithm; + + /** + * Constructs a new instance of <code>AlgorithmParameterGenerator</code>. + * + * @param paramGenSpi + * the generator to use. + * @param provider + * the provider to use. + * @param algorithm + * the algorithm to use. + */ + protected AlgorithmParameterGenerator(AlgorithmParameterGeneratorSpi + paramGenSpi, Provider provider, + String algorithm) + { + this.paramGenSpi = paramGenSpi; + this.provider = provider; + this.algorithm = algorithm; + } + + /** @return the name of the algorithm. */ + public final String getAlgorithm() + { + return algorithm; + } + + /** + * Returns a new <code>AlgorithmParameterGenerator</code> instance which + * generates algorithm parameters for the specified algorithm. + * + * @param algorithm the name of algorithm to use. + * @return the new instance. + * @throws NoSuchAlgorithmException if <code>algorithm</code> is not + * implemented by any provider. + * @throws IllegalArgumentException if <code>algorithm</code> is + * <code>null</code> or is an empty string. + */ + public static AlgorithmParameterGenerator getInstance(String algorithm) + throws NoSuchAlgorithmException + { + Provider[] p = Security.getProviders(); + NoSuchAlgorithmException lastException = null; + for (int i = 0; i < p.length; i++) + try + { + return getInstance(algorithm, p[i]); + } + catch (NoSuchAlgorithmException x) + { + lastException = x; + } + if (lastException != null) + throw lastException; + throw new NoSuchAlgorithmException(algorithm); + } + + /** + * Returns a new <code>AlgorithmParameterGenerator</code> instance which + * generates algorithm parameters for the specified algorithm. + * + * @param algorithm the name of algorithm to use. + * @param provider the name of the {@link Provider} to use. + * @return the new instance. + * @throws NoSuchAlgorithmException if the algorithm is not implemented by the + * named provider. + * @throws NoSuchProviderException if the named provider was not found. + * @throws IllegalArgumentException if either <code>algorithm</code> or + * <code>provider</code> is <code>null</code> or empty. + */ + public static AlgorithmParameterGenerator getInstance(String algorithm, + String provider) + throws NoSuchAlgorithmException, NoSuchProviderException + { + if (provider == null) + throw new IllegalArgumentException("provider MUST NOT be null"); + provider = provider.trim(); + if (provider.length() == 0) + throw new IllegalArgumentException("provider MUST NOT be empty"); + Provider p = Security.getProvider(provider); + if (p == null) + throw new NoSuchProviderException(provider); + return getInstance(algorithm, p); + } + + /** + * Returns a new <code>AlgorithmParameterGenerator</code> instance which + * generates algorithm parameters for the specified algorithm. + * + * @param algorithm the name of algorithm to use. + * @param provider the {@link Provider} to use. + * @return the new instance. + * @throws NoSuchAlgorithmException if the algorithm is not implemented by + * {@link Provider}. + * @throws IllegalArgumentException if either <code>algorithm</code> or + * <code>provider</code> is <code>null</code>, or if + * <code>algorithm</code> is an empty string. + * @since 1.4 + * @see Provider + */ + public static AlgorithmParameterGenerator getInstance(String algorithm, + Provider provider) + throws NoSuchAlgorithmException + { + CPStringBuilder sb = new CPStringBuilder() + .append("AlgorithmParameterGenerator for algorithm [") + .append(algorithm).append("] from provider[") + .append(provider).append("] could not be created"); + Throwable cause; + try + { + Object spi = Engine.getInstance(ALGORITHM_PARAMETER_GENERATOR, + algorithm, + provider); + return new AlgorithmParameterGenerator((AlgorithmParameterGeneratorSpi) spi, + provider, + algorithm); + } + catch (InvocationTargetException x) + { + cause = x.getCause(); + if (cause instanceof NoSuchAlgorithmException) + throw (NoSuchAlgorithmException) cause; + if (cause == null) + cause = x; + } + catch (ClassCastException x) + { + cause = x; + } + NoSuchAlgorithmException x = new NoSuchAlgorithmException(sb.toString()); + x.initCause(cause); + throw x; + } + + /** @return the {@link Provider} of this generator. */ + public final Provider getProvider() + { + return provider; + } + + /** + * Initializes this instance with the specified size. Since no source of + * randomness is supplied, a default one will be used. + * + * @param size + * size (in bits) to use. + */ + public final void init(int size) + { + init(size, new SecureRandom()); + } + + /** + * Initializes this instance with the specified key-size and source of + * randomness. + * + * @param size + * the size (in bits) to use. + * @param random + * the {@link SecureRandom} to use. + */ + public final void init(int size, SecureRandom random) + { + paramGenSpi.engineInit(size, random); + } + + /** + * Initializes this instance with the specified {@link AlgorithmParameterSpec}. + * Since no source of randomness is supplied, a default one will be used. + * + * @param genParamSpec + * the {@link AlgorithmParameterSpec} to use. + * @throws InvalidAlgorithmParameterException + * if <code>genParamSpec</code> is invalid. + */ + public final void init(AlgorithmParameterSpec genParamSpec) + throws InvalidAlgorithmParameterException + { + init(genParamSpec, new SecureRandom()); + } + + /** + * Initializes this instance with the specified {@link AlgorithmParameterSpec} + * and source of randomness. + * + * @param genParamSpec + * the {@link AlgorithmParameterSpec} to use. + * @param random + * the {@link SecureRandom} to use. + * @throws InvalidAlgorithmParameterException + * if <code>genParamSpec</code> is invalid. + */ + public final void init(AlgorithmParameterSpec genParamSpec, + SecureRandom random) + throws InvalidAlgorithmParameterException + { + paramGenSpi.engineInit(genParamSpec, random); + } + + /** @return a new instance of {@link AlgorithmParameters}. */ + public final AlgorithmParameters generateParameters() + { + return paramGenSpi.engineGenerateParameters(); + } +} |