Rev 846 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 827 | daniel-mar | 1 | <?php |
| 2 | |||
| 3 | /** |
||
| 4 | * SSH2 Signature Handler |
||
| 5 | * |
||
| 6 | * PHP version 5 |
||
| 7 | * |
||
| 8 | * Handles signatures in the format used by SSH2 |
||
| 9 | * |
||
| 874 | daniel-mar | 10 | * @category Crypt |
| 11 | * @package Common |
||
| 827 | daniel-mar | 12 | * @author Jim Wigginton <terrafrost@php.net> |
| 13 | * @copyright 2016 Jim Wigginton |
||
| 14 | * @license http://www.opensource.org/licenses/mit-license.html MIT License |
||
| 15 | * @link http://phpseclib.sourceforge.net |
||
| 16 | */ |
||
| 17 | |||
| 18 | namespace phpseclib3\Crypt\DSA\Formats\Signature; |
||
| 19 | |||
| 20 | use phpseclib3\Common\Functions\Strings; |
||
| 21 | use phpseclib3\Math\BigInteger; |
||
| 22 | |||
| 23 | /** |
||
| 24 | * SSH2 Signature Handler |
||
| 25 | * |
||
| 874 | daniel-mar | 26 | * @package Common |
| 827 | daniel-mar | 27 | * @author Jim Wigginton <terrafrost@php.net> |
| 874 | daniel-mar | 28 | * @access public |
| 827 | daniel-mar | 29 | */ |
| 30 | abstract class SSH2 |
||
| 31 | { |
||
| 32 | /** |
||
| 33 | * Loads a signature |
||
| 34 | * |
||
| 874 | daniel-mar | 35 | * @access public |
| 827 | daniel-mar | 36 | * @param string $sig |
| 37 | * @return mixed |
||
| 38 | */ |
||
| 39 | public static function load($sig) |
||
| 40 | { |
||
| 41 | if (!is_string($sig)) { |
||
| 42 | return false; |
||
| 43 | } |
||
| 44 | |||
| 45 | $result = Strings::unpackSSH2('ss', $sig); |
||
| 46 | if ($result === false) { |
||
| 47 | return false; |
||
| 48 | } |
||
| 49 | list($type, $blob) = $result; |
||
| 50 | if ($type != 'ssh-dss' || strlen($blob) != 40) { |
||
| 51 | return false; |
||
| 52 | } |
||
| 53 | |||
| 54 | return [ |
||
| 55 | 'r' => new BigInteger(substr($blob, 0, 20), 256), |
||
| 56 | 's' => new BigInteger(substr($blob, 20), 256) |
||
| 57 | ]; |
||
| 58 | } |
||
| 59 | |||
| 60 | /** |
||
| 61 | * Returns a signature in the appropriate format |
||
| 62 | * |
||
| 874 | daniel-mar | 63 | * @access public |
| 827 | daniel-mar | 64 | * @param \phpseclib3\Math\BigInteger $r |
| 65 | * @param \phpseclib3\Math\BigInteger $s |
||
| 66 | * @return string |
||
| 67 | */ |
||
| 68 | public static function save(BigInteger $r, BigInteger $s) |
||
| 69 | { |
||
| 70 | if ($r->getLength() > 160 || $s->getLength() > 160) { |
||
| 71 | return false; |
||
| 72 | } |
||
| 73 | return Strings::packSSH2( |
||
| 74 | 'ss', |
||
| 75 | 'ssh-dss', |
||
| 76 | str_pad($r->toBytes(), 20, "\0", STR_PAD_LEFT) . |
||
| 77 | str_pad($s->toBytes(), 20, "\0", STR_PAD_LEFT) |
||
| 78 | ); |
||
| 79 | } |
||
| 80 | } |