001 /* DSAKeyPairGenerator.java -- Initialize a DSA key generator 002 Copyright (C) 1998, 2004 Free Software Foundation, Inc. 003 004 This file is part of GNU Classpath. 005 006 GNU Classpath is free software; you can redistribute it and/or modify 007 it under the terms of the GNU General Public License as published by 008 the Free Software Foundation; either version 2, or (at your option) 009 any later version. 010 011 GNU Classpath is distributed in the hope that it will be useful, but 012 WITHOUT ANY WARRANTY; without even the implied warranty of 013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 General Public License for more details. 015 016 You should have received a copy of the GNU General Public License 017 along with GNU Classpath; see the file COPYING. If not, write to the 018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 019 02110-1301 USA. 020 021 Linking this library statically or dynamically with other modules is 022 making a combined work based on this library. Thus, the terms and 023 conditions of the GNU General Public License cover the whole 024 combination. 025 026 As a special exception, the copyright holders of this library give you 027 permission to link this library with independent modules to produce an 028 executable, regardless of the license terms of these independent 029 modules, and to copy and distribute the resulting executable under 030 terms of your choice, provided that you also meet, for each linked 031 independent module, the terms and conditions of the license of that 032 module. An independent module is a module which is not derived from 033 or based on this library. If you modify this library, you may extend 034 this exception to your version of the library, but you are not 035 obligated to do so. If you do not wish to do so, delete this 036 exception statement from your version. */ 037 038 package java.security.interfaces; 039 040 import java.security.InvalidParameterException; 041 import 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 */ 054 public 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 }