From 0689c16309a8a404f920f5e5543b64ad8a3309b2 Mon Sep 17 00:00:00 2001
From: Alexander Pankratov <s.pankratoff@gmail.com>
Date: Tue, 8 Aug 2023 18:47:22 +0200
Subject: [PATCH] Hotfix: bytes to string

---
 src/MTProtoTools/Files.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/MTProtoTools/Files.php b/src/MTProtoTools/Files.php
index 21f27228e..531c31840 100644
--- a/src/MTProtoTools/Files.php
+++ b/src/MTProtoTools/Files.php
@@ -1103,8 +1103,8 @@ trait Files
                 return 0;
             }
             if (isset($messageMedia['cdn_key'])) {
-                $ivec = \substr($messageMedia['cdn_iv'], 0, 12).\pack('N', $offset['offset'] >> 4);
-                $res['bytes'] = Crypt::ctrEncrypt($res['bytes'], $messageMedia['cdn_key'], $ivec);
+                $ivec = \substr((string)$messageMedia['cdn_iv'], 0, 12).\pack('N', $offset['offset'] >> 4);
+                $res['bytes'] = Crypt::ctrEncrypt($res['bytes'], (string)$messageMedia['cdn_key'], $ivec);
                 $this->checkCdnHash($messageMedia['file_token'], $offset['offset'], $res['bytes'], $old_dc);
             }
             if (isset($messageMedia['key'])) {