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   1  <?php
   2  
   3  /**
   4   * PBKDF2params
   5   *
   6   * PHP version 5
   7   *
   8   * @author    Jim Wigginton <terrafrost@php.net>
   9   * @copyright 2016 Jim Wigginton
  10   * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
  11   * @link      http://phpseclib.sourceforge.net
  12   */
  13  
  14  namespace phpseclib3\File\ASN1\Maps;
  15  
  16  use phpseclib3\File\ASN1;
  17  
  18  /**
  19   * PBKDF2params
  20   *
  21   * from https://tools.ietf.org/html/rfc2898#appendix-A.3
  22   *
  23   * @author  Jim Wigginton <terrafrost@php.net>
  24   */
  25  abstract class PBKDF2params
  26  {
  27      const MAP = [
  28          'type' => ASN1::TYPE_SEQUENCE,
  29          'children' => [
  30              // technically, this is a CHOICE in RFC2898 but the other "choice" is, currently, more of a placeholder
  31              // in the RFC
  32              'salt' => ['type' => ASN1::TYPE_OCTET_STRING],
  33              'iterationCount' => ['type' => ASN1::TYPE_INTEGER],
  34              'keyLength' => [
  35                  'type' => ASN1::TYPE_INTEGER,
  36                  'optional' => true
  37              ],
  38              'prf' => AlgorithmIdentifier::MAP + ['optional' => true]
  39          ]
  40      ];
  41  }