public function getSha256()
    {
        if (!$this->sha256) {
            $this->sha256 = $this->media->getHash('sha256');
        }

        return $this->sha256;
    }
public function getSha256()
    {
        if (!$this->sha256) {
            $this->sha256 = $this->media->getHash('sha256');
        }

        return $this->sha256;
    }
public function getSha256 ( ) { if ( ! $ this -> sha256 ) { $ this -> sha256 = $ this -> media -> getHash ( 'sha256' ) ; } return $ this -> sha256 ; }
Returns the sha256 checksum of the document

@return string
Returns the sha256 checksum of the document