[ie/xhamster] Fix extractor (#14286)

Closes #14145
Authored by: nicolaasjan, willsmillie

Co-authored-by: nicolaasjan <14093220+nicolaasjan@users.noreply.github.com>

yt_dlp/extractor/xhamster.py

@@ -1,3 +1,4 @@
+import base64
 import itertools
 import re
 
@@ -12,6 +13,7 @@ from ..utils import (
     int_or_none,
     parse_duration,
     str_or_none,
+    try_call,
     try_get,
     unified_strdate,
     url_or_none,
@@ -229,6 +231,11 @@ class XHamsterIE(InfoExtractor):
                                 standard_url = standard_format.get(standard_format_key)
                                 if not standard_url:
                                     continue
+                                decoded = try_call(lambda: base64.b64decode(standard_url))
+                                if decoded and decoded[:4] == b'xor_':
+                                    standard_url = bytes(
+                                        a ^ b for a, b in
+                                        zip(decoded[4:], itertools.cycle(b'xh7999'))).decode()
                                 standard_url = urljoin(url, standard_url)
                                 if not standard_url or standard_url in format_urls:
                                     continue