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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 BigInteger $n
* @param BigInteger $e
* @param 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 BigInteger $n
* @param 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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