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Update ineptpdf.py

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integer division, and version
This commit is contained in:
Apprentice Harper 2021-01-03 16:11:02 +00:00
parent ed412bee35
commit a7974f0f14
2 changed files with 6 additions and 5 deletions
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3
DeDRM_plugin/__init__.py
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@ -5,7 +5,7 @@
# Copyright © 2008-2020 Apprentice Harper et al. # Copyright © 2008-2020 Apprentice Harper et al.
__license__ = 'GPL v3' __license__ = 'GPL v3'
__version__ = '7.0.2' __version__ = '7.0.3'
__docformat__ = 'restructuredtext en' __docformat__ = 'restructuredtext en'
@ -73,6 +73,7 @@ __docformat__ = 'restructuredtext en'
# 7.0.0 - Switched to Python 3 for calibre 5.0. Thanks to all who contributed # 7.0.0 - Switched to Python 3 for calibre 5.0. Thanks to all who contributed
# 7.0.1 - More Python 3 changes. Adobe PDF decryption should now work in some cases # 7.0.1 - More Python 3 changes. Adobe PDF decryption should now work in some cases
# 7.0.2 - More Python 3 changes. Adobe PDF decryption should now work on PC too. # 7.0.2 - More Python 3 changes. Adobe PDF decryption should now work on PC too.
# 7.0.3 - More Python 3 changes. Integer division in ineptpdf.py
""" """
Decrypt DRMed ebooks. Decrypt DRMed ebooks.

8
DeDRM_plugin/ineptpdf.py
View file

@ -1482,7 +1482,7 @@ class PDFDocument(object):
# global static principal key for German Onleihe / Bibliothek Digital # global static principal key for German Onleihe / Bibliothek Digital
principalkeys = { b'bibliothek-digital.de': codecs.decode(b'rRwGv2tbpKov1krvv7PO0ws9S436/lArPlfipz5Pqhw=','base64')} principalkeys = { b'bibliothek-digital.de': codecs.decode(b'rRwGv2tbpKov1krvv7PO0ws9S436/lArPlfipz5Pqhw=','base64')}
self.is_printable = self.is_modifiable = self.is_extractable = True self.is_printable = self.is_modifiable = self.is_extractable = True
length = int_value(param.get('Length', 0)) / 8 length = int_value(param.get('Length', 0)) // 8
edcdata = str_value(param.get('EDCData')).decode('base64') edcdata = str_value(param.get('EDCData')).decode('base64')
pdrllic = str_value(param.get('PDRLLic')).decode('base64') pdrllic = str_value(param.get('PDRLLic')).decode('base64')
pdrlpol = str_value(param.get('PDRLPol')).decode('base64') pdrlpol = str_value(param.get('PDRLPol')).decode('base64')
@ -1547,8 +1547,8 @@ class PDFDocument(object):
if 5 <= R: if 5 <= R:
# 8 # 8
for _ in range(50): for _ in range(50):
hash = hashlib.md5(hash.digest()[:length/8]) hash = hashlib.md5(hash.digest()[:length//8])
key = hash.digest()[:length/8] key = hash.digest()[:length//8]
if R == 2: if R == 2:
# Algorithm 3.4 # Algorithm 3.4
u1 = ARC4.new(key).decrypt(password) u1 = ARC4.new(key).decrypt(password)
@ -1590,7 +1590,7 @@ class PDFDocument(object):
def initialize_ebx(self, password, docid, param): def initialize_ebx(self, password, docid, param):
self.is_printable = self.is_modifiable = self.is_extractable = True self.is_printable = self.is_modifiable = self.is_extractable = True
rsa = RSA(password) rsa = RSA(password)
length = int_value(param.get('Length', 0)) / 8 length = int_value(param.get('Length', 0)) // 8
rights = codecs.decode(param.get('ADEPT_LICENSE'), 'base64') rights = codecs.decode(param.get('ADEPT_LICENSE'), 'base64')
rights = zlib.decompress(rights, -15) rights = zlib.decompress(rights, -15)
rights = etree.fromstring(rights) rights = etree.fromstring(rights)