com.lithium.flow.util.Passwords Maven / Gradle / Ivy

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/*
 * Copyright 2017 Lithium Technologies, Inc.
 *
 * 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 com.lithium.flow.util;

import java.security.SecureRandom;
import java.util.Random;

import javax.annotation.Nonnull;

/**
 * @author Matt Ayres
 */
public class Passwords {
	private static final Random RANDOM = new SecureRandom();
	private static final char[] CHARS = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".toCharArray();

	@Nonnull
	public static String create(int len) {
		StringBuilder sb = new StringBuilder();
		for (int i = 0; i < len; i++) {
			sb.append(CHARS[RANDOM.nextInt(CHARS.length)]);
		}
		return sb.toString();
	}
}