randomhex.java

来自「java kerberos implementation」· Java 代码 · 共 52 行

/*
  Simple Implementation of Kerberos protocol v5
  Copyright (C) 2003 Thia Yeo Ching ([e-mail])

  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License
  as published by the Free Software Foundation; either version 2
  of the License, or (at your option) any later version.

  This program 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 for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/

package SimpleKerberos.tool;

import java.security.SecureRandom;

/**
 * Used for session key
 */
public class RandomHex
{
  private static final String SECURE_RANDOM_ALGO_NAME = "SHA1PRNG";

  /**
   * Get a random hex string
   * @return the length of the string will be 15 or 16 (64/4)
   */
  public static String getNextRandom()
  {
    SecureRandom sr;
    try
    {
      sr = SecureRandom.getInstance(SECURE_RANDOM_ALGO_NAME);
      return Long.toHexString(sr.nextLong()).toUpperCase();
    }
    catch (Exception e)
    {
      e.printStackTrace();
    }

    return null;
  }
}