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-rw-r--r--youtube_dl/extractor/youtube.py37
1 files changed, 18 insertions, 19 deletions
diff --git a/youtube_dl/extractor/youtube.py b/youtube_dl/extractor/youtube.py
index 91cd2192f..b1e2edf75 100644
--- a/youtube_dl/extractor/youtube.py
+++ b/youtube_dl/extractor/youtube.py
@@ -179,25 +179,24 @@ class YoutubeIE(InfoExtractor):
def _decrypt_signature(self, s):
"""Turn the encrypted s field into a working signature"""
- 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[83:36:-1] + s[2] + s[35:26:-1] + s[3] + s[25:3:-1] + s[26]
- 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]
-
- else:
- raise ExtractorError(u'Unable to decrypt signature, key length %d not supported; retrying might work' % (len(s)))
+ 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;
def _get_available_subtitles(self, video_id):
self.report_video_subtitles_download(video_id)