/* * Copyright (c) 1997, 2005, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code 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 * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package java.security.interfaces; import java.security.*; /** * An interface to an object capable of generating DSA key pairs. * *
The initialize
methods may each be called any number
* of times. If no initialize
method is called on a
* DSAKeyPairGenerator, the default is to generate 1024-bit keys, using
* precomputed p, q and g parameters and an instance of SecureRandom as
* the random bit source.
*
*
Users wishing to indicate DSA-specific parameters, and to generate a key * pair suitable for use with the DSA algorithm typically * *
getInstance
method with "DSA"
* as its argument.* *
initialize
methods from this DSAKeyPairGenerator interface.* *
generateKeyPair
* method from the KeyPairGenerator class.
*
* Note: it is not always necessary to do do algorithm-specific
* initialization for a DSA key pair generator. That is, it is not always
* necessary to call an initialize
method in this interface.
* Algorithm-independent initialization using the initialize
method
* in the KeyPairGenerator
* interface is all that is needed when you accept defaults for algorithm-specific
* parameters.
*
* @see java.security.KeyPairGenerator
*/
public interface DSAKeyPairGenerator {
/**
* Initializes the key pair generator using the DSA family parameters
* (p,q and g) and an optional SecureRandom bit source. If a
* SecureRandom bit source is needed but not supplied, i.e. null, a
* default SecureRandom instance will be used.
*
* @param params the parameters to use to generate the keys.
*
* @param random the random bit source to use to generate key bits;
* can be null.
*
* @exception InvalidParameterException if the params
* value is invalid or null.
*/
public void initialize(DSAParams params, SecureRandom random)
throws InvalidParameterException;
/**
* Initializes the key pair generator for a given modulus length
* (instead of parameters), and an optional SecureRandom bit source.
* If a SecureRandom bit source is needed but not supplied, i.e.
* null, a default SecureRandom instance will be used.
*
*
If genParams
is true, this method generates new
* p, q and g parameters. If it is false, the method uses precomputed
* parameters for the modulus length requested. If there are no
* precomputed parameters for that modulus length, an exception will be
* thrown. It is guaranteed that there will always be
* default parameters for modulus lengths of 512 and 1024 bits.
*
* @param modlen the modulus length in bits. Valid values are any
* multiple of 8 between 512 and 1024, inclusive.
*
* @param random the random bit source to use to generate key bits;
* can be null.
*
* @param genParams whether or not to generate new parameters for
* the modulus length requested.
*
* @exception InvalidParameterException if modlen
is not
* between 512 and 1024, or if genParams
is false and
* there are no precomputed parameters for the requested modulus
* length.
*/
public void initialize(int modlen, boolean genParams, SecureRandom random)
throws InvalidParameterException;
}