A simple password generator class.

   1  /**
   2   * Simple password generator.
   3   *
   4   * @author marko haapala at aktagon com
   5   */
   6  public class PasswordGenerator {
   7    public static final char[] HEX_CHARS = { 'a','b','c','d','e','f','g','h','0','1','2','3','4','5','6','7','8','9' };
   8    public static final char[] SECURE_CHARS = { 'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u',
   9                                                'v','w','x','y','z','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P',
  10                                                'Q','R','S','T','U','V','W','X','Y','Z','0','1','2','3','4','5','6','7','8','9','=',
  11                                                '!','"','#','¤','%','&','/','(',')' };
  12    /**
  13     * Generates an eight characters long password consisting of hexadecimal characters.
  14     *
  15     * @return the generated password
  16     */
  17    public static String generate() {
  18      return generate(HEX_CHARS, 8);
  19    }
  20  
  21    /**
  22     * Generates a password consisting of hexadecimal characters.
  23     *
  24     * @param length of the password
  25     * @return the generated password
  26     */
  27    public static String generate(final int length) {
  28      return generate(HEX_CHARS, length);
  29    }
  30  
  31    /**
  32     * Generates a password according to the given parameters.
  33     *
  34     * @param characters that make up the password
  35     * @param length of the password
  36     * @return the generated password
  37     */
  38    public static String generate(final char[] characters, final int length) {
  39      RandomString randomString = new RandomString(PseudoRandom.getRandom(), characters);
  40      return randomString.getString(length);
  41    }
  42  }
  43