org.apache.sshd.common.random.JceRandom Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.sshd.common.random;
import java.security.SecureRandom;
/**
* A Random implementation using the built-in {@link SecureRandom} PRNG.
*
* @author Apache MINA SSHD Project
*/
public class JceRandom extends AbstractRandom {
public static final String NAME = "JCE";
private byte[] tmp = new byte[16];
private final SecureRandom random = new SecureRandom();
public JceRandom() {
super();
}
@Override
public String getName() {
return NAME;
}
@Override
public synchronized void fill(byte[] foo, int start, int len) {
if ((start == 0) && (len == foo.length)) {
random.nextBytes(foo);
} else {
if (len > tmp.length) {
tmp = new byte[len];
}
random.nextBytes(tmp);
System.arraycopy(tmp, 0, foo, start, len);
}
}
@Override
public synchronized int random(int n) {
return random.nextInt(n);
}
}