gnu.javax.crypto.key.dh

Class GnuDHKeyPairGenerator

Implemented Interfaces:
IKeyPairGenerator

public class GnuDHKeyPairGenerator
extends Object
implements IKeyPairGenerator

An implementation of a Diffie-Hellman keypair generator.

Reference:

  1. Diffie-Hellman Key Agreement Method
    Eric Rescorla.

Field Summary

static int
DEFAULT_EXPONENT_SIZE
Default value for the size in bits of the private exponent (x).
static int
DEFAULT_PRIME_SIZE
Default value for the size in bits of the public prime (p).
static String
DH_PARAMETERS
Property name of an optional DHGenParameterSpec or DHParameterSpec instance to use for this generator.
static String
EXPONENT_SIZE
Property name of the size in bits (Integer) of the private exponent (x).
static String
PREFERRED_ENCODING_FORMAT
Property name of the preferred encoding format to use when externalizing generated instance of key-pairs from this generator.
static String
PRIME_SIZE
Property name of the size in bits (Integer) of the public prime (p).
static String
SOURCE_OF_RANDOMNESS
Property name of an optional SecureRandom instance to use.

Method Summary

KeyPair
generate()
Generates a new keypair based on the attributes used to configure the instance.
String
name()
Returns the canonical name of this keypair generator.
void
setup(Map<K,V> attributes)
[Re]-initialises this instance for use with a given set of attributes.

Methods inherited from class java.lang.Object

clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

DEFAULT_EXPONENT_SIZE

public static final int DEFAULT_EXPONENT_SIZE
Default value for the size in bits of the private exponent (x).
Field Value:
160

DEFAULT_PRIME_SIZE

public static final int DEFAULT_PRIME_SIZE
Default value for the size in bits of the public prime (p).
Field Value:
512

DH_PARAMETERS

public static final String DH_PARAMETERS
Property name of an optional DHGenParameterSpec or DHParameterSpec instance to use for this generator.
Field Value:
"gnu.crypto.dh.params"

EXPONENT_SIZE

public static final String EXPONENT_SIZE
Property name of the size in bits (Integer) of the private exponent (x).
Field Value:
"gnu.crypto.dh.m"

PREFERRED_ENCODING_FORMAT

public static final String PREFERRED_ENCODING_FORMAT
Property name of the preferred encoding format to use when externalizing generated instance of key-pairs from this generator. The property is taken to be an Integer that encapsulates an encoding format identifier.
Field Value:
"gnu.crypto.dh.encoding"

PRIME_SIZE

public static final String PRIME_SIZE
Property name of the size in bits (Integer) of the public prime (p).
Field Value:
"gnu.crypto.dh.L"

SOURCE_OF_RANDOMNESS

public static final String SOURCE_OF_RANDOMNESS
Property name of an optional SecureRandom instance to use. The default is to use a classloader singleton from PRNG.
Field Value:
"gnu.crypto.dh.prng"

Method Details

generate

public KeyPair generate()
Generates a new keypair based on the attributes used to configure the instance.
Specified by:
generate in interface IKeyPairGenerator
Returns:
a new keypair.

name

public String name()
Returns the canonical name of this keypair generator.
Specified by:
name in interface IKeyPairGenerator
Returns:
the canonical name of this instance.

setup

public void setup(Map<K,V> attributes)
[Re]-initialises this instance for use with a given set of attributes.
Specified by:
setup in interface IKeyPairGenerator
Parameters:
attributes - a map of name/value pairs to use for setting up the instance.
Throws:
IllegalArgumentException - if at least one of the mandatory attributes is missing or an invalid value was specified.

GnuDHKeyPairGenerator.java -- Copyright (C) 2003, 2006, 2010 Free Software Foundation, Inc. This file is a 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 of the License, 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; if not, write to the Free Software Foundation, Inc., 51 Franklin St, 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.