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   1  <?php
   2  
   3  /**
   4   * "PKCS1" Formatted EC Key Handler
   5   *
   6   * PHP version 5
   7   *
   8   * Processes keys with the following headers:
   9   *
  10   * -----BEGIN DH PARAMETERS-----
  11   *
  12   * Technically, PKCS1 is for RSA keys, only, but we're using PKCS1 to describe
  13   * DSA, whose format isn't really formally described anywhere, so might as well
  14   * use it to describe this, too.
  15   *
  16   * @category  Crypt
  17   * @package   DH
  18   * @author    Jim Wigginton <[email protected]>
  19   * @copyright 2015 Jim Wigginton
  20   * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
  21   * @link      http://phpseclib.sourceforge.net
  22   */
  23  
  24  namespace phpseclib3\Crypt\DH\Formats\Keys;
  25  
  26  use phpseclib3\Crypt\Common\Formats\Keys\PKCS1 as Progenitor;
  27  use phpseclib3\File\ASN1;
  28  use phpseclib3\File\ASN1\Maps;
  29  use phpseclib3\Math\BigInteger;
  30  
  31  /**
  32   * "PKCS1" Formatted DH Key Handler
  33   *
  34   * @package DH
  35   * @author  Jim Wigginton <[email protected]>
  36   * @access  public
  37   */
  38  abstract class PKCS1 extends Progenitor
  39  {
  40      /**
  41       * Break a public or private key down into its constituent components
  42       *
  43       * @access public
  44       * @param string $key
  45       * @param string $password optional
  46       * @return array
  47       */
  48      public static function load($key, $password = '')
  49      {
  50          $key = parent::load($key, $password);
  51  
  52          $decoded = ASN1::decodeBER($key);
  53          if (empty($decoded)) {
  54              throw new \RuntimeException('Unable to decode BER');
  55          }
  56  
  57          $components = ASN1::asn1map($decoded[0], Maps\DHParameter::MAP);
  58          if (!is_array($components)) {
  59              throw new \RuntimeException('Unable to perform ASN1 mapping on parameters');
  60          }
  61  
  62          return $components;
  63      }
  64  
  65      /**
  66       * Convert EC parameters to the appropriate format
  67       *
  68       * @access public
  69       * @return string
  70       */
  71      public static function saveParameters(BigInteger $prime, BigInteger $base, array $options = [])
  72      {
  73          $params = [
  74              'prime' => $prime,
  75              'base' => $base
  76          ];
  77          $params = ASN1::encodeDER($params, Maps\DHParameter::MAP);
  78  
  79          return "-----BEGIN DH PARAMETERS-----\r\n" .
  80                 chunk_split(base64_encode($params), 64) .
  81                 "-----END DH PARAMETERS-----\r\n";
  82      }
  83  }