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<?php
namespace Bitrix\Main\Web;
use UnexpectedValueException;
/**
* JSON Web Key implementation, based on this spec:
* https://tools.ietf.org/html/draft-ietf-jose-json-web-key-41
*
* PHP version 5
*
* @package Firebase\JWT
* @author Bui Sy Nguyen <nguyenbs@gmail.com>
* @license http://opensource.org/licenses/BSD-3-Clause 3-clause BSD
* @link https://github.com/fproject/php-jwt
*/
class JWK
{
/**
* Parse a set of JWK keys
* @param $source
* @return array an associative array represents the set of keys
*/
public static function parseKeySet($source)
{
$keys = [];
if (is_string($source)) {
$source = json_decode($source, true);
} else if (is_object($source)) {
if (property_exists($source, 'keys'))
$source = (array)$source;
else
$source = [$source];
}
if (is_array($source)) {
if (isset($source['keys']))
$source = $source['keys'];
foreach ($source as $k => $v) {
if (!is_string($k)) {
if (is_array($v) && isset($v['kid']))
$k = $v['kid'];
elseif (is_object($v) && property_exists($v, 'kid'))
$k = $v->{'kid'};
}
try {
$v = self::parseKey($v);
$keys[$k] = $v;
} catch (UnexpectedValueException $e) {
//Do nothing
}
}
}
if (0 < count($keys)) {
return $keys;
}
throw new UnexpectedValueException('Failed to parse JWK');
}
/**
* Parse a JWK key
* @param $source
* @return resource|array an associative array represents the key
*/
public static function parseKey($source)
{
if (!is_array($source))
$source = (array)$source;
if (!empty($source) && isset($source['kty']) && isset($source['n']) && isset($source['e'])) {
switch ($source['kty']) {
case 'RSA':
if (array_key_exists('d', $source))
throw new UnexpectedValueException('Failed to parse JWK: RSA private key is not supported');
$pem = self::createPemFromModulusAndExponent($source['n'], $source['e']);
$pKey = openssl_pkey_get_public($pem);
if ($pKey !== false)
return $pKey;
break;
default:
//Currently only RSA is supported
break;
}
}
throw new UnexpectedValueException('Failed to parse JWK');
}
/**
*
* Create a public key represented in PEM format from RSA modulus and exponent information
*
* @param string $n the RSA modulus encoded in Base64
* @param string $e the RSA exponent encoded in Base64
* @return string the RSA public key represented in PEM format
*/
private static function createPemFromModulusAndExponent($n, $e)
{
$modulus = JWT::urlsafeB64Decode($n);
$publicExponent = JWT::urlsafeB64Decode($e);
$components = array(
'modulus' => pack('Ca*a*', 2, self::encodeLength(strlen($modulus)), $modulus),
'publicExponent' => pack('Ca*a*', 2, self::encodeLength(strlen($publicExponent)), $publicExponent)
);
$RSAPublicKey = pack(
'Ca*a*a*',
48,
self::encodeLength(strlen($components['modulus']) + strlen($components['publicExponent'])),
$components['modulus'],
$components['publicExponent']
);
// sequence(oid(1.2.840.113549.1.1.1), null)) = rsaEncryption.
$rsaOID = pack('H*', '300d06092a864886f70d0101010500'); // hex version of MA0GCSqGSIb3DQEBAQUA
$RSAPublicKey = chr(0) . $RSAPublicKey;
$RSAPublicKey = chr(3) . self::encodeLength(strlen($RSAPublicKey)) . $RSAPublicKey;
$RSAPublicKey = pack(
'Ca*a*',
48,
self::encodeLength(strlen($rsaOID . $RSAPublicKey)),
$rsaOID . $RSAPublicKey
);
$RSAPublicKey = "-----BEGIN PUBLIC KEY-----\r\n" .
chunk_split(base64_encode($RSAPublicKey), 64) .
'-----END PUBLIC KEY-----';
return $RSAPublicKey;
}
/**
* DER-encode the length
*
* DER supports lengths up to (2**8)**127, however, we'll only support lengths up to (2**8)**4. See
* {@link http://itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#p=13 X.690 paragraph 8.1.3} for more information.
*
* @access private
* @param int $length
* @return string
*/
private static function encodeLength($length)
{
if ($length <= 0x7F) {
return chr($length);
}
$temp = ltrim(pack('N', $length), chr(0));
return pack('Ca*', 0x80 | strlen($temp), $temp);
}
}