From aedd6bb97de7ed82da746892e2a0b32ee9c6d6b8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jaime=20Marqui=CC=81nez=20Ferra=CC=81ndiz?=
 <jaime.marquinez.ferrandiz@gmail.com>
Date: Thu, 25 Jul 2013 22:06:53 +0200
Subject: [PATCH] YoutubeIE: new algo for length 81 (fixes #1127)

---
 devscripts/youtube_genalgo.py   | 4 ++--
 test/test_youtube_sig.py        | 2 +-
 youtube_dl/extractor/youtube.py | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/devscripts/youtube_genalgo.py b/devscripts/youtube_genalgo.py
index 93ec32a4b..3218113e7 100644
--- a/devscripts/youtube_genalgo.py
+++ b/devscripts/youtube_genalgo.py
@@ -32,9 +32,9 @@ tests = [
     # 82
     ("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKHGFDSAZXCVBNM!@#$%^&*(-+={[};?/>.<",
      "Q>/?;}[{=+-(*<^%$#@!MNBVCXZASDFGHKLPOIUY8REWT0q&7654321mnbvcxzasdfghjklpoiuytrew9"),
-    # 81
+    # 81 - vflLC8JvQ 2013/07/25
     ("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKHGFDSAZXCVBNM!@#$%^&*(-+={[};?/>.",
-     "urty8ioplkjhgfdsazxcvbqm1234567e90QWERTYUIOPLKHGFDSnZXCVBNM!@#$%^&*(-+={[};?/>."),
+     "C>/?;}[{=+-(*&^%$#@!MNBVYXZASDFGHKLPOIU.TREWQ0q87659321mnbvcxzasdfghjkl4oiuytrewp"),
 ]
 
 def find_matching(wrong, right):
diff --git a/test/test_youtube_sig.py b/test/test_youtube_sig.py
index 6da7c5502..4e50d6f90 100644
--- a/test/test_youtube_sig.py
+++ b/test/test_youtube_sig.py
@@ -60,7 +60,7 @@ class TestYoutubeSig(unittest.TestCase):
 
     def test_81(self):
         wrong = "qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKHGFDSAZXCVBNM!@#$%^&*(-+={[};?/>."
-        right = "urty8ioplkjhgfdsazxcvbqm1234567e90QWERTYUIOPLKHGFDSnZXCVBNM!@#$%^&*(-+={[};?/>."
+        right = "C>/?;}[{=+-(*&^%$#@!MNBVYXZASDFGHKLPOIU.TREWQ0q87659321mnbvcxzasdfghjkl4oiuytrewp"
         self.assertEqual(sig(wrong), right)
 
 if __name__ == '__main__':
diff --git a/youtube_dl/extractor/youtube.py b/youtube_dl/extractor/youtube.py
index 491018d6c..f86929e06 100644
--- a/youtube_dl/extractor/youtube.py
+++ b/youtube_dl/extractor/youtube.py
@@ -296,7 +296,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
         elif len(s) == 82:
             return s[36] + s[79:67:-1] + s[81] + s[66:40:-1] + s[33] + s[39:36:-1] + s[40] + s[35] + s[0] + s[67] + s[32:0:-1] + s[34]
         elif len(s) == 81:
-            return s[6] + s[3:6] + s[33] + s[7:24] + s[0] + s[25:33] + s[2] + s[34:53] + s[24] + s[54:81]
+            return s[56] + s[79:56:-1] + s[41] + s[55:41:-1] + s[80] + s[40:34:-1] + s[0] + s[33:29:-1] + s[34] + s[28:9:-1] + s[29] + s[8:0:-1] + s[9]
 
         else:
             raise ExtractorError(u'Unable to decrypt signature, key length %d not supported; retrying might work' % (len(s)))