001/* DSAKeyPairGenerator.java -- Initialize a DSA key generator 002 Copyright (C) 1998, 2004 Free Software Foundation, Inc. 003 004This file is part of GNU Classpath. 005 006GNU Classpath is free software; you can redistribute it and/or modify 007it under the terms of the GNU General Public License as published by 008the Free Software Foundation; either version 2, or (at your option) 009any later version. 010 011GNU Classpath is distributed in the hope that it will be useful, but 012WITHOUT ANY WARRANTY; without even the implied warranty of 013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014General Public License for more details. 015 016You should have received a copy of the GNU General Public License 017along with GNU Classpath; see the file COPYING. If not, write to the 018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 01902110-1301 USA. 020 021Linking this library statically or dynamically with other modules is 022making a combined work based on this library. Thus, the terms and 023conditions of the GNU General Public License cover the whole 024combination. 025 026As a special exception, the copyright holders of this library give you 027permission to link this library with independent modules to produce an 028executable, regardless of the license terms of these independent 029modules, and to copy and distribute the resulting executable under 030terms of your choice, provided that you also meet, for each linked 031independent module, the terms and conditions of the license of that 032module. An independent module is a module which is not derived from 033or based on this library. If you modify this library, you may extend 034this exception to your version of the library, but you are not 035obligated to do so. If you do not wish to do so, delete this 036exception statement from your version. */ 037 038package java.security.interfaces; 039 040import java.security.InvalidParameterException; 041import java.security.SecureRandom; 042 043/** 044 * This interface contains methods for intializing a Digital Signature 045 * Algorithm key generation engine. The initialize methods may be called 046 * any number of times. If no explicity initialization call is made, then 047 * the engine defaults to generating 1024-bit keys using pre-calculated 048 * base, prime, and subprime values. 049 * 050 * @version 0.0 051 * 052 * @author Aaron M. Renn (arenn@urbanophile.com) 053 */ 054public interface DSAKeyPairGenerator 055{ 056 /** 057 * Initializes the key generator with the specified DSA parameters and 058 * random bit source 059 * 060 * @param params The DSA parameters to use 061 * @param random The random bit source to use 062 * 063 * @exception InvalidParameterException If the parameters passed are not valid 064 */ 065 void initialize (DSAParams params, SecureRandom random) 066 throws InvalidParameterException; 067 068 /** 069 * Initializes the key generator to a give modulus. If the <code>genParams</code> 070 * value is <code>true</code> then new base, prime, and subprime values 071 * will be generated for the given modulus. If not, the pre-calculated 072 * values will be used. If no pre-calculated values exist for the specified 073 * modulus, an exception will be thrown. It is guaranteed that there will 074 * always be pre-calculated values for all modulus values between 512 and 075 * 1024 bits inclusives. 076 * 077 * @param modlen The modulus length 078 * @param genParams <code>true</code> to generate new DSA parameters, <code>false</code> otherwise 079 * @param random The random bit source to use 080 * 081 * @exception InvalidParameterException If a parameter is invalid 082 */ 083 void initialize (int modlen, boolean genParams, SecureRandom random) 084 throws InvalidParameterException; 085}