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[hentainexus] fix extraction (fixes #1166)

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Mike Fährmann 2020-12-12 20:30:51 +01:00
parent b6f1fe59cb
commit 1d753542c2
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GPG Key ID: 5680CA389D365A88
1 changed files with 25 additions and 11 deletions
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36
gallery_dl/extractor/hentainexus.py
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@ -58,7 +58,7 @@ class HentainexusGalleryExtractor(GalleryExtractor):
return data
def images(self, _):
url = "{}/read/{}/001".format(self.root, self.gallery_id)
url = "{}/read/{}".format(self.root, self.gallery_id)
page = self.request(url).text
data = json.loads(self._decode(text.extract(
@ -73,23 +73,37 @@ class HentainexusGalleryExtractor(GalleryExtractor):
@staticmethod
def _decode(data):
# https://hentainexus.com/static/js/reader.min.js?r=6
# https://hentainexus.com/static/js/reader.min.js?r=13
primes = (2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53)
blob = binascii.a2b_base64(data)
key = blob[0:64]
indices = list(range(256))
result = ""
C = 0
for k in key:
C = C ^ k
for _ in range(8):
if C & 1:
C = C >> 1 ^ 0xc
else:
C = C >> 1
k = primes[C & 0x7]
x = 0
S = list(range(256))
for i in range(256):
x = (x + indices[i] + key[i % len(key)]) % 256
indices[i], indices[x] = indices[x], indices[i]
x = (x + S[i] + key[i % len(key)]) % 256
S[i], S[x] = S[x], S[i]
x = i = 0
result = ""
a = c = m = x = 0
for n in range(64, len(blob)):
i = (i + 1) % 256
x = (x + indices[i]) % 256
indices[i], indices[x] = indices[x], indices[i]
result += chr(blob[n] ^ indices[(indices[i] + indices[x]) % 256])
a = (a + k) % 256
x = (c + S[(x + S[a]) % 256]) % 256
c = (c + a + S[a]) % 256
S[a], S[x] = S[x], S[a]
m = S[(x + S[(a + S[(m + c) % 256]) % 256]) % 256]
result += chr(blob[n] ^ m)
return result