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Diffstat (limited to 'libjava/java/security/AlgorithmParameterGenerator.java')
| -rw-r--r-- | libjava/java/security/AlgorithmParameterGenerator.java | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/libjava/java/security/AlgorithmParameterGenerator.java b/libjava/java/security/AlgorithmParameterGenerator.java new file mode 100644 index 00000000000..b10cb48d15b --- /dev/null +++ b/libjava/java/security/AlgorithmParameterGenerator.java @@ -0,0 +1,219 @@ +/* AlgorithmParameterGenerator.java --- Algorithm Parameter Generator + Copyright (C) 1999 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., 59 Temple Place, Suite 330, Boston, MA +02111-1307 USA. + +As a special exception, if you link this library with other files to +produce an executable, this library does not by itself cause the +resulting executable to be covered by the GNU General Public License. +This exception does not however invalidate any other reasons why the +executable file might be covered by the GNU General Public License. */ + +package java.security; +import java.security.spec.AlgorithmParameterSpec; + +/** + AlgorithmParameterGenerator is used to generate + algorithm parameters for specified algorithms. + This class is used to generate the algorithm parameters + for a specific algorithm. + + @since JDK 1.2 + @author Mark Benvenuto + */ +public class AlgorithmParameterGenerator +{ + private AlgorithmParameterGeneratorSpi paramGenSpi; + private Provider provider; + private String algorithm; + + /** + Creates an instance of AlgorithmParameters + + @param paramSpi A parameters engine to use + @param provider A provider to use + @param algorithm The algorithm + */ + protected AlgorithmParameterGenerator(AlgorithmParameterGeneratorSpi + paramGenSpi, Provider provider, + String algorithm) + { + this.paramGenSpi = paramGenSpi; + this.provider = provider; + this.algorithm = algorithm; + } + + /** + Returns the name of the algorithm used + + @return A string with the name of the algorithm + */ + public final String getAlgorithm() + { + return algorithm; + } + + /** + Gets an instance of the AlgorithmParameterGenerator class + which generates algorithm parameters for the specified algorithm. + If the algorithm is not found then, it throws NoSuchAlgorithmException. + + @param algorithm the name of algorithm to choose + @return a AlgorithmParameterGenerator repesenting the desired algorithm + + @throws NoSuchAlgorithmException if the algorithm is not implemented by providers + */ + public static AlgorithmParameterGenerator getInstance(String algorithm) + throws NoSuchAlgorithmException + { + Provider[] p = Security.getProviders(); + + for (int i = 0; i < p.length; i++) + { + String classname = + p[i].getProperty("AlgorithmParameterGenerator." + algorithm); + if (classname != null) + return getInstance(classname, algorithm, p[i]); + } + + throw new NoSuchAlgorithmException(algorithm); + } + + /** + Gets an instance of the AlgorithmParameterGenerator class + which generates algorithm parameters for the specified algorithm. + If the algorithm is not found then, it throws NoSuchAlgorithmException. + + @param algorithm the name of algorithm to choose + @param provider the name of the provider to find the algorithm in + @return a AlgorithmParameterGenerator repesenting the desired algorithm + + @throws NoSuchAlgorithmException if the algorithm is not implemented by the provider + @throws NoSuchProviderException if the provider is not found + */ + public static AlgorithmParameterGenerator getInstance(String algorithm, + String provider) + throws NoSuchAlgorithmException, NoSuchProviderException + { + Provider p = Security.getProvider(provider); + if (p == null) + throw new NoSuchProviderException(); + + return getInstance(p. + getProperty("AlgorithmParameterGenerator." + + algorithm), algorithm, p); + } + + private static AlgorithmParameterGenerator getInstance(String classname, + String algorithm, + Provider provider) + throws NoSuchAlgorithmException + { + + try + { + return new + AlgorithmParameterGenerator((AlgorithmParameterGeneratorSpi) Class. + forName(classname).newInstance(), + provider, algorithm); + } + catch (ClassNotFoundException cnfe) + { + throw new NoSuchAlgorithmException("Class not found"); + } + catch (InstantiationException ie) + { + throw new NoSuchAlgorithmException("Class instantiation failed"); + } + catch (IllegalAccessException iae) + { + throw new NoSuchAlgorithmException("Illegal Access"); + } + } + + /** + Gets the provider that the class is from. + + @return the provider of this class + */ + public final Provider getProvider() + { + return provider; + } + + /** + Initializes the Algorithm Parameter Generator with the specified + size. (Since no source of randomness is supplied, a default + one is supplied). + + @param size size (in bits) to use + */ + public final void init(int size) + { + init(size, new SecureRandom()); + } + + /** + Initializes the Algorithm Parameter Generator with the specified + size and source of randomness. + + @param size size (in bits) to use + @param random source of randomness to use + */ + public final void init(int size, SecureRandom random) + { + paramGenSpi.engineInit(size, random); + } + + /** + Initializes the Algorithm Parameter Generator with the specified + AlgorithmParameterSpec. (Since no source of randomness is supplied, + a default one is supplied). + + @param genParamSpec the AlgorithmParameterSpec class to use + */ + public final void init(AlgorithmParameterSpec genParamSpec) throws + InvalidAlgorithmParameterException + { + init(genParamSpec, new SecureRandom()); + } + + /** + Initializes the Algorithm Parameter Generator with the specified + AlgorithmParameterSpec and source of randomness. + + @param genParamSpec the AlgorithmParameterSpec class to use + @param random source of randomness to use + */ + public final void init(AlgorithmParameterSpec genParamSpec, + SecureRandom random) throws + InvalidAlgorithmParameterException + { + paramGenSpi.engineInit(genParamSpec, random); + } + + /** + Generate a new set of AlgorithmParameters. + + @returns a new set of algorithm parameters + */ + public final AlgorithmParameters generateParameters() + { + return paramGenSpi.engineGenerateParameters(); + } +} |