com.klaytn.caver.utils.SecureRandomUtils Maven / Gradle / Ivy
/*
* Modifications copyright 2019 The caver-java Authors
* Copyright 2016 Conor Svensson
*
* 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.
*
* This file is derived from web3j/crypto/src/main/java/org/web3j/crypto/SecureRandomUtils.java (2019/06/13).
* Modified and improved for the caver-java development.
*/
package com.klaytn.caver.utils;
import org.web3j.crypto.LinuxSecureRandom;
import java.security.SecureRandom;
public final class SecureRandomUtils {
private static final SecureRandom SECURE_RANDOM;
static {
if (isAndroidRuntime()) {
new LinuxSecureRandom();
}
SECURE_RANDOM = new SecureRandom();
}
public static SecureRandom secureRandom() {
return SECURE_RANDOM;
}
// Taken from BitcoinJ implementation
// https://github.com/bitcoinj/bitcoinj/blob/3cb1f6c6c589f84fe6e1fb56bf26d94cccc85429/core/src/main/java/org/bitcoinj/core/Utils.java#L573
private static int isAndroid = -1;
static boolean isAndroidRuntime() {
if (isAndroid == -1) {
final String runtime = System.getProperty("java.runtime.name");
isAndroid = (runtime != null && runtime.equals("Android Runtime")) ? 1 : 0;
}
return isAndroid == 1;
}
private SecureRandomUtils() { }
}