hotspot/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.salver/src/org/graalvm/compiler/salver/util/ECIDUtil.java

/*
 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package org.graalvm.compiler.salver.util;

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

public class ECIDUtil {

    private static final Random RANDOM = new SecureRandom();

    private static final String BASE58_ALPHABET = "ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz123456789";

    public static String random() {
        return random(8);
    }

    public static String random(int length) {
        StringBuilder sb = new StringBuilder();
        byte[] bytes = new byte[length];
        RANDOM.nextBytes(bytes);
        for (byte b : bytes) {
            sb.append(BASE58_ALPHABET.charAt((b & 0xff) % 58));
        }
        return sb.toString();
    }
}