From 373475f03553a7fff2d20df878755bfad2fab8e5 Mon Sep 17 00:00:00 2001
From: shirt <2660574+shirt-dev@users.noreply.github.com>
Date: Sun, 17 Oct 2021 22:44:20 -0400
Subject: [PATCH] [fragments] Pad fragments before decrypting (#1298)

Closes #197, #1297, #1007
Authored by: shirt-dev
---
 yt_dlp/downloader/fragment.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/yt_dlp/downloader/fragment.py b/yt_dlp/downloader/fragment.py
index 6a490131b1..d0eaede7ee 100644
--- a/yt_dlp/downloader/fragment.py
+++ b/yt_dlp/downloader/fragment.py
@@ -355,7 +355,8 @@ class FragmentFD(FileDownloader):
             # not what it decrypts to.
             if self.params.get('test', False):
                 return frag_content
-            decrypted_data = aes_cbc_decrypt_bytes(frag_content, decrypt_info['KEY'], iv)
+            padding_len = 16 - (len(frag_content) % 16)
+            decrypted_data = aes_cbc_decrypt_bytes(frag_content + bytes([padding_len] * padding_len), decrypt_info['KEY'], iv)
             return decrypted_data[:-decrypted_data[-1]]
 
         return decrypt_fragment