io.jsonwebtoken.impl.security.Randoms Maven / Gradle / Ivy
/*
* Copyright (C) 2021 jsonwebtoken.io
*
* Licensed 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 io.jsonwebtoken.impl.security;
import java.security.SecureRandom;
/**
* @since 0.12.0
*/
public final class Randoms {
private static final SecureRandom DEFAULT_SECURE_RANDOM;
static {
DEFAULT_SECURE_RANDOM = new SecureRandom();
DEFAULT_SECURE_RANDOM.nextBytes(new byte[64]);
}
private Randoms() {
}
/**
* Returns JJWT's default SecureRandom number generator - a static singleton which may be cached if desired.
* The RNG is initialized using the JVM default as follows:
*
*
* static {
* DEFAULT_SECURE_RANDOM = new SecureRandom();
* DEFAULT_SECURE_RANDOM.nextBytes(new byte[64]);
* }
*
*
* nextBytes is called to force the RNG to initialize itself if not already initialized. The
* byte array is not used and discarded immediately for garbage collection.
*
* @return JJWT's default SecureRandom number generator.
*/
public static SecureRandom secureRandom() {
return DEFAULT_SECURE_RANDOM;
}
}