mirror of git://gcc.gnu.org/git/gcc.git
314 lines
10 KiB
Java
314 lines
10 KiB
Java
/* KeyPairGenerator.java --- Key Pair Generator Class
|
|
Copyright (C) 1999, 2002, 2003, 2004, 2005 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>KeyPairGenerator</code> is a class used to generate key-pairs for a
|
|
* security algorithm.
|
|
*
|
|
* <p>The <code>KeyPairGenerator</code> is created with the
|
|
* <code>getInstance()</code> Factory methods. It is used to generate a pair of
|
|
* public and private keys for a specific algorithm and associate this key-pair
|
|
* with the algorithm parameters it was initialized with.</p>
|
|
*
|
|
* @see KeyPair
|
|
* @see AlgorithmParameterSpec
|
|
* @author Mark Benvenuto
|
|
* @author Casey Marshall
|
|
*/
|
|
public abstract class KeyPairGenerator extends KeyPairGeneratorSpi
|
|
{
|
|
/** The service name for key pair generators. */
|
|
private static final String KEY_PAIR_GENERATOR = "KeyPairGenerator";
|
|
|
|
Provider provider;
|
|
private String algorithm;
|
|
|
|
/**
|
|
* Constructs a new instance of <code>KeyPairGenerator</code>.
|
|
*
|
|
* @param algorithm
|
|
* the algorithm to use.
|
|
*/
|
|
protected KeyPairGenerator(String algorithm)
|
|
{
|
|
this.algorithm = algorithm;
|
|
this.provider = null;
|
|
}
|
|
|
|
/**
|
|
* Returns the name of the algorithm used.
|
|
*
|
|
* @return the name of the algorithm used.
|
|
*/
|
|
public String getAlgorithm()
|
|
{
|
|
return algorithm;
|
|
}
|
|
|
|
/**
|
|
* Returns a new instance of <code>KeyPairGenerator</code> which generates
|
|
* key-pairs for the specified algorithm.
|
|
*
|
|
* @param algorithm the name of the algorithm to use.
|
|
* @return a new instance repesenting the desired algorithm.
|
|
* @throws NoSuchAlgorithmException if the algorithm is not implemented by any
|
|
* provider.
|
|
* @throws IllegalArgumentException if <code>algorithm</code> is
|
|
* <code>null</code> or is an empty string.
|
|
*/
|
|
public static KeyPairGenerator 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 instance of <code>KeyPairGenerator</code> which generates
|
|
* key-pairs for the specified algorithm from a named provider.
|
|
*
|
|
* @param algorithm the name of the algorithm to use.
|
|
* @param provider the name of a {@link Provider} to use.
|
|
* @return a new instance repesenting the desired algorithm.
|
|
* @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 KeyPairGenerator 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 instance of <code>KeyPairGenerator</code> which generates
|
|
* key-pairs for the specified algorithm from a designated {@link Provider}.
|
|
*
|
|
* @param algorithm
|
|
* the name of the algorithm to use.
|
|
* @param provider
|
|
* the {@link Provider} to use.
|
|
* @return a new insatnce repesenting the desired algorithm.
|
|
* @throws NoSuchAlgorithmException
|
|
* if the algorithm is not implemented by the {@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 KeyPairGenerator getInstance(String algorithm,
|
|
Provider provider)
|
|
throws NoSuchAlgorithmException
|
|
{
|
|
CPStringBuilder sb = new CPStringBuilder("KeyPairGenerator for algorithm [")
|
|
.append(algorithm).append("] from provider[")
|
|
.append(provider).append("] ");
|
|
Object o;
|
|
try
|
|
{
|
|
o = Engine.getInstance(KEY_PAIR_GENERATOR, algorithm, provider);
|
|
}
|
|
catch (InvocationTargetException x)
|
|
{
|
|
Throwable cause = x.getCause();
|
|
if (cause instanceof NoSuchAlgorithmException)
|
|
throw (NoSuchAlgorithmException) cause;
|
|
if (cause == null)
|
|
cause = x;
|
|
sb.append("could not be created");
|
|
NoSuchAlgorithmException y = new NoSuchAlgorithmException(sb.toString());
|
|
y.initCause(cause);
|
|
throw y;
|
|
}
|
|
KeyPairGenerator result;
|
|
if (o instanceof KeyPairGenerator)
|
|
{
|
|
result = (KeyPairGenerator) o;
|
|
result.algorithm = algorithm;
|
|
}
|
|
else if (o instanceof KeyPairGeneratorSpi)
|
|
result = new DummyKeyPairGenerator((KeyPairGeneratorSpi) o, algorithm);
|
|
else
|
|
{
|
|
sb.append("is of an unexpected Type: ").append(o.getClass().getName());
|
|
throw new NoSuchAlgorithmException(sb.toString());
|
|
}
|
|
result.provider = provider;
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Returns the {@link Provider} of this instance.
|
|
*
|
|
* @return the {@link Provider} of this instance.
|
|
*/
|
|
public final Provider getProvider()
|
|
{
|
|
return provider;
|
|
}
|
|
|
|
/**
|
|
* Initializes this instance for the specified key size. Since no source of
|
|
* randomness is specified, a default one will be used.
|
|
*
|
|
* @param keysize
|
|
* the size of keys to use.
|
|
*/
|
|
public void initialize(int keysize)
|
|
{
|
|
initialize(keysize, new SecureRandom());
|
|
}
|
|
|
|
/**
|
|
* Initializes this instance for the specified key size and
|
|
* {@link SecureRandom}.
|
|
*
|
|
* @param keysize
|
|
* the size of keys to use.
|
|
* @param random
|
|
* the {@link SecureRandom} to use.
|
|
* @since 1.2
|
|
*/
|
|
public void initialize(int keysize, SecureRandom random)
|
|
{
|
|
}
|
|
|
|
/**
|
|
* Initializes this instance with the specified
|
|
* {@link AlgorithmParameterSpec}. Since no source of randomness is specified,
|
|
* a default one will be used.
|
|
*
|
|
* @param params
|
|
* the {@link AlgorithmParameterSpec} to use.
|
|
* @throws InvalidAlgorithmParameterException
|
|
* if the designated specifications are invalid.
|
|
* @since 1.2
|
|
*/
|
|
public void initialize(AlgorithmParameterSpec params)
|
|
throws InvalidAlgorithmParameterException
|
|
{
|
|
initialize(params, new SecureRandom());
|
|
}
|
|
|
|
/**
|
|
* Initializes this instance with the specified {@link AlgorithmParameterSpec}
|
|
* and {@link SecureRandom}.
|
|
*
|
|
* @param params
|
|
* the {@link AlgorithmParameterSpec} to use.
|
|
* @param random
|
|
* the {@link SecureRandom} to use.
|
|
* @throws InvalidAlgorithmParameterException
|
|
* if the designated specifications are invalid.
|
|
* @since 1.2
|
|
*/
|
|
public void initialize(AlgorithmParameterSpec params, SecureRandom random)
|
|
throws InvalidAlgorithmParameterException
|
|
{
|
|
super.initialize(params, random);
|
|
}
|
|
|
|
/**
|
|
* Generates a new "DSA" {@link KeyPair} from the "GNU" security provider.
|
|
*
|
|
* <p>This method generates a unique key-pair each time it is called.</p>
|
|
*
|
|
* @return a new unique {@link KeyPair}.
|
|
* @see #generateKeyPair()
|
|
* @since 1.2
|
|
*/
|
|
public final KeyPair genKeyPair()
|
|
{
|
|
try
|
|
{
|
|
return getInstance("DSA", "GNU").generateKeyPair();
|
|
}
|
|
catch (Exception e)
|
|
{
|
|
System.err.println("genKeyPair failed: " + e);
|
|
e.printStackTrace();
|
|
return null;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Generates a new "DSA" {@link KeyPair} from the "GNU" security provider.
|
|
*
|
|
* <p>This method generates a unique key pair each time it is called.</p>
|
|
*
|
|
* @return a new unique {@link KeyPair}.
|
|
* @see #genKeyPair()
|
|
*/
|
|
public KeyPair generateKeyPair()
|
|
{
|
|
return genKeyPair();
|
|
}
|
|
}
|