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  1. <?php
  2.  
  3. /**
  4.  * Fingerprint Trait for Public Keys
  5.  *
  6.  * PHP version 5
  7.  *
  8.  * @author    Jim Wigginton <terrafrost@php.net>
  9.  * @copyright 2015 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\Crypt\Common\Traits;
  15.  
  16. use phpseclib3\Crypt\Hash;
  17.  
  18. /**
  19.  * Fingerprint Trait for Private Keys
  20.  *
  21.  * @author  Jim Wigginton <terrafrost@php.net>
  22.  */
  23. trait Fingerprint
  24. {
  25.     /**
  26.      * Returns the public key's fingerprint
  27.      *
  28.      * The public key's fingerprint is returned, which is equivalent to running `ssh-keygen -lf rsa.pub`. If there is
  29.      * no public key currently loaded, false is returned.
  30.      * Example output (md5): "c1:b1:30:29:d7:b8:de:6c:97:77:10:d7:46:41:63:87" (as specified by RFC 4716)
  31.      *
  32.      * @param string $algorithm The hashing algorithm to be used. Valid options are 'md5' and 'sha256'. False is returned
  33.      * for invalid values.
  34.      * @return mixed
  35.      */
  36.     public function getFingerprint($algorithm = 'md5')
  37.     {
  38.         $type = self::validatePlugin('Keys', 'OpenSSH', 'savePublicKey');
  39.         if ($type === false) {
  40.             return false;
  41.         }
  42.         $key = $this->toString('OpenSSH', ['binary' => true]);
  43.         if ($key === false) {
  44.             return false;
  45.         }
  46.         switch ($algorithm) {
  47.             case 'sha256':
  48.                 $hash = new Hash('sha256');
  49.                 $base = base64_encode($hash->hash($key));
  50.                 return substr($base, 0, strlen($base) - 1);
  51.             case 'md5':
  52.                 return substr(chunk_split(md5($key), 2, ':'), 0, -1);
  53.             default:
  54.                 return false;
  55.         }
  56.     }
  57. }
  58.