org.wildfly.security.util.PasswordUtil Maven / Gradle / Ivy
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* JBoss, Home of Professional Open Source.
* Copyright 2021 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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 org.wildfly.security.util;
import java.security.SecureRandom;
public class PasswordUtil {
private static final SecureRandom RANDOM = new SecureRandom();
private static final String CHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
/**
* Generate a random string of given size.
*
* @param stringSize the size of the string
* @return a random string
*/
public static String generateSecureRandomString(int stringSize) {
StringBuilder builder = new StringBuilder();
for (int i = 0; i < stringSize; i++) {
int index = (int) (RANDOM.nextDouble() * CHARS.length());
builder.append(CHARS, index, index + 1);
}
return builder.toString();
}
}