From 5c468ca8a852a00a55b4559d31f5e9861e76d748 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 22:50:24 +0200
Subject: [PATCH] YoutubeIE: add algo for length 79 (fixes #1126)

---
 devscripts/youtube_genalgo.py   | 3 +++
 test/test_youtube_sig.py        | 5 +++++
 youtube_dl/extractor/youtube.py | 2 ++
 3 files changed, 10 insertions(+)

diff --git a/devscripts/youtube_genalgo.py b/devscripts/youtube_genalgo.py
index 3218113e7..22977ccd9 100644
--- a/devscripts/youtube_genalgo.py
+++ b/devscripts/youtube_genalgo.py
@@ -35,6 +35,9 @@ tests = [
     # 81 - vflLC8JvQ 2013/07/25
     ("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKHGFDSAZXCVBNM!@#$%^&*(-+={[};?/>.",
      "C>/?;}[{=+-(*&^%$#@!MNBVYXZASDFGHKLPOIU.TREWQ0q87659321mnbvcxzasdfghjkl4oiuytrewp"),
+    # 79 - vflLC8JvQ 2013/07/25 (sporadic)
+    ("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKHGFDSAZXCVBNM!@#$%^&*(-+={[};?/",
+     "Z?;}[{=+-(*&^%$#@!MNBVCXRASDFGHKLPOIUYT/EWQ0q87659321mnbvcxzasdfghjkl4oiuytrewp"),
 ]
 
 def find_matching(wrong, right):
diff --git a/test/test_youtube_sig.py b/test/test_youtube_sig.py
index 4e50d6f90..4d45a0e08 100644
--- a/test/test_youtube_sig.py
+++ b/test/test_youtube_sig.py
@@ -63,5 +63,10 @@ class TestYoutubeSig(unittest.TestCase):
         right = "C>/?;}[{=+-(*&^%$#@!MNBVYXZASDFGHKLPOIU.TREWQ0q87659321mnbvcxzasdfghjkl4oiuytrewp"
         self.assertEqual(sig(wrong), right)
 
+    def test_79(self):
+        wrong = "qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKHGFDSAZXCVBNM!@#$%^&*(-+={[};?/"
+        right = "Z?;}[{=+-(*&^%$#@!MNBVCXRASDFGHKLPOIUYT/EWQ0q87659321mnbvcxzasdfghjkl4oiuytrewp"
+        self.assertEqual(sig(wrong), right)
+
 if __name__ == '__main__':
     unittest.main()
diff --git a/youtube_dl/extractor/youtube.py b/youtube_dl/extractor/youtube.py
index f86929e06..f10f2e3dd 100644
--- a/youtube_dl/extractor/youtube.py
+++ b/youtube_dl/extractor/youtube.py
@@ -297,6 +297,8 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
             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[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]
+        elif len(s) == 79:
+            return s[54] + s[77:54:-1] + s[39] + s[53:39:-1] + s[78] + s[38:34:-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)))