backup
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src
/
JetBackup
/
3rdparty
/
phpseclib3
/
Crypt
/
DSA
/
Formats
/
Signature
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ASN1.php
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SSH2.php
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SSH2.php
72 lines
| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * SSH2 Signature Handler |
| 5 | * |
| 6 | * PHP version 5 |
| 7 | * |
| 8 | * Handles signatures in the format used by SSH2 |
| 9 | * |
| 10 | * @author Jim Wigginton <terrafrost@php.net> |
| 11 | * @copyright 2016 Jim Wigginton |
| 12 | * @license http://www.opensource.org/licenses/mit-license.html MIT License |
| 13 | * @link http://phpseclib.sourceforge.net |
| 14 | */ |
| 15 | |
| 16 | declare(strict_types=1); |
| 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 | * |
| 26 | * @author Jim Wigginton <terrafrost@php.net> |
| 27 | */ |
| 28 | abstract class SSH2 |
| 29 | { |
| 30 | /** |
| 31 | * Loads a signature |
| 32 | */ |
| 33 | public static function load(string $sig) |
| 34 | { |
| 35 | if (!is_string($sig)) { |
| 36 | return false; |
| 37 | } |
| 38 | |
| 39 | $result = Strings::unpackSSH2('ss', $sig); |
| 40 | if ($result === false) { |
| 41 | return false; |
| 42 | } |
| 43 | [$type, $blob] = $result; |
| 44 | if ($type != 'ssh-dss' || strlen($blob) != 40) { |
| 45 | return false; |
| 46 | } |
| 47 | |
| 48 | return [ |
| 49 | 'r' => new BigInteger(substr($blob, 0, 20), 256), |
| 50 | 's' => new BigInteger(substr($blob, 20), 256), |
| 51 | ]; |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * Returns a signature in the appropriate format |
| 56 | * |
| 57 | * @return string |
| 58 | */ |
| 59 | public static function save(BigInteger $r, BigInteger $s) |
| 60 | { |
| 61 | if ($r->getLength() > 160 || $s->getLength() > 160) { |
| 62 | return false; |
| 63 | } |
| 64 | return Strings::packSSH2( |
| 65 | 'ss', |
| 66 | 'ssh-dss', |
| 67 | str_pad($r->toBytes(), 20, "\0", STR_PAD_LEFT) . |
| 68 | str_pad($s->toBytes(), 20, "\0", STR_PAD_LEFT) |
| 69 | ); |
| 70 | } |
| 71 | } |
| 72 |