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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 827 | daniel-mar | 1 | <?php |
| 2 | |||
| 3 | /** |
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| 4 | * SSH2 Signature Handler |
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| 5 | * |
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| 6 | * PHP version 5 |
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| 7 | * |
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| 8 | * Handles signatures in the format used by SSH2 |
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| 9 | * |
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| 874 | daniel-mar | 10 | * @category Crypt |
| 11 | * @package Common |
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| 827 | daniel-mar | 12 | * @author Jim Wigginton <terrafrost@php.net> |
| 13 | * @copyright 2016 Jim Wigginton |
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| 14 | * @license http://www.opensource.org/licenses/mit-license.html MIT License |
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| 15 | * @link http://phpseclib.sourceforge.net |
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| 16 | */ |
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| 17 | |||
| 18 | namespace phpseclib3\Crypt\EC\Formats\Signature; |
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| 19 | |||
| 20 | use phpseclib3\Common\Functions\Strings; |
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| 21 | use phpseclib3\Math\BigInteger; |
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| 22 | |||
| 23 | /** |
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| 24 | * SSH2 Signature Handler |
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| 25 | * |
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| 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 |
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| 31 | { |
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| 32 | /** |
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| 33 | * Loads a signature |
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| 34 | * |
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| 874 | daniel-mar | 35 | * @access public |
| 827 | daniel-mar | 36 | * @param string $sig |
| 37 | * @return mixed |
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| 38 | */ |
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| 39 | public static function load($sig) |
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| 40 | { |
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| 41 | if (!is_string($sig)) { |
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| 42 | return false; |
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| 43 | } |
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| 44 | |||
| 45 | $result = Strings::unpackSSH2('ss', $sig); |
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| 46 | if ($result === false) { |
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| 47 | return false; |
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| 48 | } |
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| 49 | list($type, $blob) = $result; |
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| 50 | switch ($type) { |
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| 51 | // see https://tools.ietf.org/html/rfc5656#section-3.1.2 |
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| 52 | case 'ecdsa-sha2-nistp256': |
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| 53 | case 'ecdsa-sha2-nistp384': |
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| 54 | case 'ecdsa-sha2-nistp521': |
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| 55 | break; |
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| 56 | default: |
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| 57 | return false; |
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| 58 | } |
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| 59 | |||
| 60 | $result = Strings::unpackSSH2('ii', $blob); |
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| 61 | if ($result === false) { |
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| 62 | return false; |
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| 63 | } |
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| 64 | |||
| 65 | return [ |
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| 66 | 'r' => $result[0], |
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| 67 | 's' => $result[1] |
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| 68 | ]; |
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| 69 | } |
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| 70 | |||
| 71 | /** |
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| 72 | * Returns a signature in the appropriate format |
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| 73 | * |
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| 874 | daniel-mar | 74 | * @access public |
| 827 | daniel-mar | 75 | * @param \phpseclib3\Math\BigInteger $r |
| 76 | * @param \phpseclib3\Math\BigInteger $s |
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| 77 | * @param string $curve |
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| 78 | * @return string |
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| 79 | */ |
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| 80 | public static function save(BigInteger $r, BigInteger $s, $curve) |
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| 81 | { |
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| 82 | switch ($curve) { |
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| 83 | case 'secp256r1': |
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| 84 | $curve = 'nistp256'; |
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| 85 | break; |
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| 86 | case 'secp384r1': |
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| 87 | $curve = 'nistp384'; |
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| 88 | break; |
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| 89 | case 'secp521r1': |
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| 90 | $curve = 'nistp521'; |
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| 91 | break; |
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| 92 | default: |
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| 93 | return false; |
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| 94 | } |
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| 95 | |||
| 96 | $blob = Strings::packSSH2('ii', $r, $s); |
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| 97 | |||
| 98 | return Strings::packSSH2('ss', 'ecdsa-sha2-' . $curve, $blob); |
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| 99 | } |
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| 100 | } |