82 lines
3.0 KiB
Java
82 lines
3.0 KiB
Java
/* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
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/*
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Copyright (c) 2002-2015 ymnk, JCraft,Inc. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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3. The names of the authors may not be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
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INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package com.jcraft.jsch.jce;
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import java.security.SecureRandom;
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public class Random implements com.jcraft.jsch.Random{
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private byte[] tmp=new byte[16];
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private SecureRandom random=null;
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public Random(){
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// We hope that 'new SecureRandom()' will use NativePRNG algorithm
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// on Sun's Java5 for GNU/Linux and Solaris.
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// It seems NativePRNG refers to /dev/urandom and it must not be blocked,
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// but NativePRNG is slower than SHA1PRNG ;-<
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// TIPS: By adding option '-Djava.security.egd=file:/dev/./urandom'
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// SHA1PRNG will be used instead of NativePRNG.
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// On MacOSX, 'new SecureRandom()' will use NativePRNG algorithm and
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// it is also slower than SHA1PRNG.
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// On Windows, 'new SecureRandom()' will use SHA1PRNG algorithm.
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random=new SecureRandom();
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/*
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try{
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random=SecureRandom.getInstance("SHA1PRNG");
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return;
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}
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catch(java.security.NoSuchAlgorithmException e){
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// System.err.println(e);
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}
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// The following code is for IBM's JCE
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try{
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random=SecureRandom.getInstance("IBMSecureRandom");
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return;
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}
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catch(java.security.NoSuchAlgorithmException ee){
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//System.err.println(ee);
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}
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*/
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}
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public void fill(byte[] foo, int start, int len){
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/*
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// This case will not become true in our usage.
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if(start==0 && foo.length==len){
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random.nextBytes(foo);
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return;
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}
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*/
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if(len>tmp.length){ tmp=new byte[len]; }
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random.nextBytes(tmp);
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System.arraycopy(tmp, 0, foo, start, len);
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}
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}
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