X-Git-Url: http://git.cielonegro.org/gitweb.cgi?a=blobdiff_plain;f=youtube_dl%2Fextractor%2Fyoutube.py;h=7577c12f5a71d0d39334e306d440ef8ba670782d;hb=7a4c6cc92f9ffec9135652a49153caffa5520c29;hp=b1e2edf75cbb59532ec092717f5efa5eaa9052f5;hpb=58e7d46d1b1d8a145c82795fa8fb75a232455274;p=youtube-dl.git

diff --git a/youtube_dl/extractor/youtube.py b/youtube_dl/extractor/youtube.py
index b1e2edf75..7577c12f5 100644
--- a/youtube_dl/extractor/youtube.py
+++ b/youtube_dl/extractor/youtube.py
@@ -179,24 +179,27 @@ class YoutubeIE(InfoExtractor):
     def _decrypt_signature(self, s):
         """Turn the encrypted s field into a working signature"""
 
-        def voodoo(a, b):
-            c = a[0];
-            a[0] = a[b % len(a)];
-            a[b] = c;
-            return a;
-
-        s = list(s)
-        s = s[2:len(s)];
-        s = s[::-1];
-        s = s[3:len(s)];
-        s = voodoo(s, 9);
-        s = s[3:len(s)];
-        s = voodoo(s, 43);
-        s = s[3:len(s)];
-        s = s[::-1];
-        s = voodoo(s, 23);
-        s = "".join(s);
-        return s;
+        if len(s) == 88:
+            return s[48] + s[81:67:-1] + s[82] + s[66:62:-1] + s[85] + s[61:48:-1] + s[67] + s[47:12:-1] + s[3] + s[11:3:-1] + s[2] + s[12]
+        elif len(s) == 87:
+            return s[62] + s[82:62:-1] + s[83] + s[61:52:-1] + s[0] + s[51:2:-1]
+        elif len(s) == 86:
+            return s[2:63] + s[82] + s[64:82] + s[63]
+        elif len(s) == 85:
+            return s[76] + s[82:76:-1] + s[83] + s[75:60:-1] + s[0] + s[59:50:-1] + s[1] + s[49:2:-1]
+        elif len(s) == 84:
+            return s[83:27:-1] + s[0] + s[26:5:-1] + s[2:0:-1] + s[27]
+        elif len(s) == 83:
+            return s[6] + s[3:6] + s[33] + s[7:24] + s[0] + s[25:33] + s[53] + s[34:53] + s[24] + s[54:]
+        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]
+        elif len(s) == 92:
+            return s[25] + s[3:25] + s[0] + s[26:42] + s[79] + s[43:79] + s[91] + s[80:83];
+
+        else:
+            raise ExtractorError(u'Unable to decrypt signature, key length %d not supported; retrying might work' % (len(s)))
 
     def _get_available_subtitles(self, video_id):
         self.report_video_subtitles_download(video_id)
@@ -588,8 +591,9 @@ class YoutubeIE(InfoExtractor):
                             else:
                                 player = u'html5 player %s' % self._search_regex(r'html5player-(.+?)\.js', video_webpage,
                                     'html5 player', fatal=False)
-                            self.to_screen('encrypted signature length %d (%d.%d), itag %s, %s' %
-                                (len(s), len(s.split('.')[0]), len(s.split('.')[1]), url_data['itag'][0], player))
+                            parts_sizes = u'.'.join(compat_str(len(part)) for part in s.split('.'))
+                            self.to_screen(u'encrypted signature length %d (%s), itag %s, %s' %
+                                (len(s), parts_sizes, url_data['itag'][0], player))
                         signature = self._decrypt_signature(url_data['s'][0])
                         url += '&signature=' + signature
                     if 'ratebypass' not in url: