001/* SecureRandomSpi.java --- Secure Random Service Provider Interface 002 Copyright (C) 1999, 2005 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; 039import java.io.Serializable; 040 041/** 042 SecureRandomSpi is the Service Provider Interface for SecureRandom 043 providers. It provides an interface for providers to the 044 SecureRandom engine to write their own pseudo-random number 045 generator. 046 047 @since JDK 1.2 048 049 @author Mark Benvenuto (ivymccough@worldnet.att.net) 050 */ 051public abstract class SecureRandomSpi implements Serializable 052{ 053 private static final long serialVersionUID = -2991854161009191830L; 054 055 /** 056 Default Constructor for SecureRandomSpi 057 */ 058 public SecureRandomSpi() 059 { 060 } 061 062 /** 063 Updates the seed for SecureRandomSpi but does not reset seed. 064 It does to this so repeated called never decrease randomness. 065 */ 066 protected abstract void engineSetSeed(byte[] seed); 067 068 /** 069 Gets a user specified number of bytes depending on the length 070 of the array? 071 072 @param bytes array to fill with random bytes 073 */ 074 protected abstract void engineNextBytes(byte[] bytes); 075 076 /** 077 Gets a user specified number of bytes specified by the 078 parameter. 079 080 @param numBytes number of random bytes to generate 081 082 @return an array full of random bytes 083 */ 084 protected abstract byte[] engineGenerateSeed(int numBytes); 085}