001 /* SecureRandomSpi.java --- Secure Random Service Provider Interface 002 Copyright (C) 1999, 2005 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; 039 import 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 */ 051 public 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 }