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<?php /** * JSON Web Key (RFC7517) Formatted RSA Handler * * PHP version 5 * * @author Jim Wigginton <terrafrost@php.net> * @copyright 2015 Jim Wigginton * @license http://www.opensource.org/licenses/mit-license.html MIT License * @link http://phpseclib.sourceforge.net */ namespace phpseclib3\Crypt\RSA\Formats\Keys; use phpseclib3\Common\Functions\Strings; use phpseclib3\Crypt\Common\Formats\Keys\JWK as Progenitor; use phpseclib3\Math\BigInteger; /** * JWK Formatted RSA Handler * * @author Jim Wigginton <terrafrost@php.net> */ abstract class JWK extends Progenitor { /** * Break a public or private key down into its constituent components * * @param string $key * @param string $password optional * @return array */ public static function load($key, $password = '') { $key = parent::load($key, $password); if ($key->kty != 'RSA') { throw new \RuntimeException('Only RSA JWK keys are supported'); } $count = $publicCount = 0; $vars = ['n', 'e', 'd', 'p', 'q', 'dp', 'dq', 'qi']; foreach ($vars as $var) { if (!isset($key->$var) || !is_string($key->$var)) { continue; } $count++; $value = new BigInteger(Strings::base64url_decode($key->$var), 256); switch ($var) { case 'n': $publicCount++; $components['modulus'] = $value; break; case 'e': $publicCount++; $components['publicExponent'] = $value; break; case 'd': $components['privateExponent'] = $value; break; case 'p': $components['primes'][1] = $value; break; case 'q': $components['primes'][2] = $value; break; case 'dp': $components['exponents'][1] = $value; break; case 'dq': $components['exponents'][2] = $value; break; case 'qi': $components['coefficients'][2] = $value; } } if ($count == count($vars)) { return $components + ['isPublicKey' => false]; } if ($count == 2 && $publicCount == 2) { return $components + ['isPublicKey' => true]; } throw new \UnexpectedValueException('Key does not have an appropriate number of RSA parameters'); } /** * Convert a private key to the appropriate format. * * @param \phpseclib3\Math\BigInteger $n * @param \phpseclib3\Math\BigInteger $e * @param \phpseclib3\Math\BigInteger $d * @param array $primes * @param array $exponents * @param array $coefficients * @param string $password optional * @param array $options optional * @return string */ public static function savePrivateKey(BigInteger $n, BigInteger $e, BigInteger $d, array $primes, array $exponents, array $coefficients, $password = '', array $options = []) { if (count($primes) != 2) { throw new \InvalidArgumentException('JWK does not support multi-prime RSA keys'); } $key = [ 'kty' => 'RSA', 'n' => Strings::base64url_encode($n->toBytes()), 'e' => Strings::base64url_encode($e->toBytes()), 'd' => Strings::base64url_encode($d->toBytes()), 'p' => Strings::base64url_encode($primes[1]->toBytes()), 'q' => Strings::base64url_encode($primes[2]->toBytes()), 'dp' => Strings::base64url_encode($exponents[1]->toBytes()), 'dq' => Strings::base64url_encode($exponents[2]->toBytes()), 'qi' => Strings::base64url_encode($coefficients[2]->toBytes()) ]; return self::wrapKey($key, $options); } /** * Convert a public key to the appropriate format * * @param \phpseclib3\Math\BigInteger $n * @param \phpseclib3\Math\BigInteger $e * @param array $options optional * @return string */ public static function savePublicKey(BigInteger $n, BigInteger $e, array $options = []) { $key = [ 'kty' => 'RSA', 'n' => Strings::base64url_encode($n->toBytes()), 'e' => Strings::base64url_encode($e->toBytes()) ]; return self::wrapKey($key, $options); } }
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