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optometrists
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Signature
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SSH2.php
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<?php /** * SSH2 Signature Handler * * PHP version 5 * * Handles signatures in the format used by SSH2 * * @author Jim Wigginton <terrafrost@php.net> * @copyright 2016 Jim Wigginton * @license http://www.opensource.org/licenses/mit-license.html MIT License * @link http://phpseclib.sourceforge.net */ namespace phpseclib3\Crypt\EC\Formats\Signature; use phpseclib3\Common\Functions\Strings; use phpseclib3\Math\BigInteger; /** * SSH2 Signature Handler * * @author Jim Wigginton <terrafrost@php.net> */ abstract class SSH2 { /** * Loads a signature * * @param string $sig * @return mixed */ public static function load($sig) { if (!is_string($sig)) { return false; } $result = Strings::unpackSSH2('ss', $sig); if ($result === false) { return false; } list($type, $blob) = $result; switch ($type) { // see https://tools.ietf.org/html/rfc5656#section-3.1.2 case 'ecdsa-sha2-nistp256': case 'ecdsa-sha2-nistp384': case 'ecdsa-sha2-nistp521': break; default: return false; } $result = Strings::unpackSSH2('ii', $blob); if ($result === false) { return false; } return [ 'r' => $result[0], 's' => $result[1] ]; } /** * Returns a signature in the appropriate format * * @param \phpseclib3\Math\BigInteger $r * @param \phpseclib3\Math\BigInteger $s * @param string $curve * @return string */ public static function save(BigInteger $r, BigInteger $s, $curve) { switch ($curve) { case 'secp256r1': $curve = 'nistp256'; break; case 'secp384r1': $curve = 'nistp384'; break; case 'secp521r1': $curve = 'nistp521'; break; default: return false; } $blob = Strings::packSSH2('ii', $r, $s); return Strings::packSSH2('ss', 'ecdsa-sha2-' . $curve, $blob); } }