rm useless code

Author: Minishlink

src/Encryption.php

@@ -61,12 +61,7 @@ public static function encrypt($payload, $userPublicKey, $userAuthToken, $native
 
         // get shared secret from user public key and local private key
         $localPrivateSecret = $localPrivateKeyObject->getSecret();
-
-        $userPublicX = $userPublicKeyObject->getPoint()
-          ->mul($localPrivateSecret)->getX();
-        // On HHVM this value is on type GMP and throws if cast to a string.
-        $userPublicX = gmp_strval($userPublicX);
-        $sharedSecret = hex2bin($math->decHex($userPublicX));
+        $sharedSecret = hex2bin($math->decHex(gmp_strval($userPublicKeyObject->getPoint()->mul($localPrivateSecret)->getX())));
 
         // generate salt
         $salt = openssl_random_pseudo_bytes(16);

src/WebPush.php

@@ -181,8 +181,8 @@ private function prepareAndSend(array $notifications)
                     'Content-Length' => Utils::safeStrlen($encrypted['cipherText']),
                     'Content-Type' => 'application/octet-stream',
                     'Content-Encoding' => 'aesgcm',
-                    'Encryption' => 'keyid="p256dh";salt="'.$encrypted['salt'].'"',
-                    'Crypto-Key' => 'keyid="p256dh";dh="'.$encrypted['localPublicKey'].'"',
+                    'Encryption' => 'salt="'.$encrypted['salt'].'"',
+                    'Crypto-Key' => 'dh="'.$encrypted['localPublicKey'].'"',
                 );
 
                 $content = $encrypted['cipherText'];