1 /*
   2  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package org.graalvm.compiler.salver.util;
  24 
  25 import java.security.SecureRandom;
  26 import java.util.Random;
  27 
  28 public class ECIDUtil {
  29 
  30     private static final Random RANDOM = new SecureRandom();
  31 
  32     private static final String BASE58_ALPHABET = "ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz123456789";
  33 
  34     public static String random() {
  35         return random(8);
  36     }
  37 
  38     public static String random(int length) {
  39         StringBuilder sb = new StringBuilder();
  40         byte[] bytes = new byte[length];
  41         RANDOM.nextBytes(bytes);
  42         for (byte b : bytes) {
  43             sb.append(BASE58_ALPHABET.charAt((b & 0xff) % 58));
  44         }
  45         return sb.toString();
  46     }
  47 }