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86 lines
2.7 KiB
Java
86 lines
2.7 KiB
Java
/*
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* @(#) $(JCGO)/goclsp/vm/java/security/VMSecureRandom.java --
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* VM specific native SecureRandom "generateSeed" implementation.
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**
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* Project: JCGO (http://www.ivmaisoft.com/jcgo/)
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* Copyright (C) 2001-2008 Ivan Maidanski <ivmai@ivmaisoft.com>
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* All rights reserved.
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**
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* Class specification origin: GNU Classpath v0.93 vm/reference
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*/
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/*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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**
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* This software is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License (GPL) for more details.
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**
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* Linking this library statically or dynamically with other modules is
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* making a combined work based on this library. Thus, the terms and
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* conditions of the GNU General Public License cover the whole
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* combination.
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**
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* As a special exception, the copyright holders of this library give you
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* permission to link this library with independent modules to produce an
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* executable, regardless of the license terms of these independent
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* modules, and to copy and distribute the resulting executable under
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* terms of your choice, provided that you also meet, for each linked
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* independent module, the terms and conditions of the license of that
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* module. An independent module is a module which is not derived from
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* or based on this library. If you modify this library, you may extend
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* this exception to your version of the library, but you are not
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* obligated to do so. If you do not wish to do so, delete this
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* exception statement from your version.
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*/
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package java.security;
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import gnu.java.security.hash.Sha160;
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final class VMSecureRandom
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{
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private VMSecureRandom() {}
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static int generateSeed(byte[] buf, int offset, int len)
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{
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long[] vals =
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new long[]
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{
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System.nanoTime(),
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Runtime.getRuntime().totalMemory(),
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Runtime.getRuntime().freeMemory()
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};
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Sha160 md = new Sha160();
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byte[] bytes = new byte[8];
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for (int i = 0; i < vals.length; i++)
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{
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long v = vals[i];
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int intval = (int) (v >>> 32);
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bytes[0] = (byte) (intval >>> 24);
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bytes[1] = (byte) (intval >>> 16);
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bytes[2] = (byte) (intval >>> 8);
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bytes[3] = (byte) intval;
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intval = (int) v;
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bytes[4] = (byte) (intval >>> 24);
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bytes[5] = (byte) (intval >>> 16);
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bytes[6] = (byte) (intval >>> 8);
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bytes[7] = (byte) intval;
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md.update(bytes, 0, 8);
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}
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int ofs = offset;
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while (len-- > 0)
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{
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bytes = md.digest();
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buf[ofs++] = bytes[0];
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md.update(bytes, 1, md.hashSize() - 1);
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}
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return ofs - offset;
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}
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}
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