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Add some Python2 compat code I forgot to add earlier

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NoDRM 2022-07-13 17:31:14 +02:00
parent c12d214b59
commit fed8bb716b
2 changed files with 19 additions and 12 deletions
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19
DeDRM_plugin/ineptpdf.py
View File

@ -50,13 +50,14 @@
# 9.1.0 - Support for decrypting with owner password, support for V=5, R=5 and R=6 PDF files, support for AES256-encrypted PDFs.
# 9.1.1 - Only support PyCryptodome; clean up the code
# 10.0.0 - Add support for "hardened" Adobe DRM (RMSDK >= 10)
# 10.0.2 - Fix some Python2 stuff
"""
Decrypts Adobe ADEPT-encrypted PDF files.
"""
__license__ = 'GPL v3'
__version__ = "10.0.0"
__version__ = "10.0.2"
import codecs
import hashlib
@ -65,6 +66,8 @@ import os
import re
import zlib
import struct
import binascii
import base64
from io import BytesIO
from decimal import Decimal
import itertools
@ -1369,7 +1372,7 @@ class PDFDocument(object):
return file_key
def process_with_aes(self, key: bytes, encrypt: bool, data: bytes, repetitions: int = 1, iv: bytes = None):
def process_with_aes(self, key, encrypt, data, repetitions = 1, iv = None):
if iv is None:
keylen = len(key)
iv = bytes([0x00]*keylen)
@ -1601,19 +1604,17 @@ class PDFDocument(object):
def initialize_ebx_ignoble(self, keyb64, docid, param):
self.is_printable = self.is_modifiable = self.is_extractable = True
try:
key = keyb64.decode('base64')[:16]
# This will probably always error, but I'm not 100% sure, so lets leave the old code in.
except AttributeError:
key = codecs.decode(keyb64.encode("ascii"), 'base64')[:16]
length = int_value(param.get('Length', 0)) / 8
rights = str_value(param.get('ADEPT_LICENSE')).decode('base64')
rights = codecs.decode(str_value(param.get('ADEPT_LICENSE')), "base64")
rights = zlib.decompress(rights, -15)
rights = etree.fromstring(rights)
expr = './/{http://ns.adobe.com/adept}encryptedKey'
bookkey = ''.join(rights.findtext(expr)).decode('base64')
bookkey = unpad(AES.new(key, AES.MODE_CBC, b'\x00'*16).decrypt(bookkey), 16) # PKCS#7
bookkey = ''.join(rights.findtext(expr))
bookkey = base64.b64decode(bookkey)
bookkey = AES.new(key, AES.MODE_CBC, b'\x00'*16).decrypt(bookkey)
bookkey = unpad(bookkey, 16) # PKCS#7
if len(bookkey) > 16:
bookkey = bookkey[-16:]
ebx_V = int_value(param.get('V', 4))

6
DeDRM_plugin/utilities.py
View File

@ -4,6 +4,7 @@
#@@CALIBRE_COMPAT_CODE@@
from ignoblekeyGenPassHash import generate_key
import sys
__license__ = 'GPL v3'
@ -21,8 +22,13 @@ DETAILED_MESSAGE = \
def uStrCmp (s1, s2, caseless=False):
import unicodedata as ud
if sys.version_info[0] == 2:
str1 = s1 if isinstance(s1, unicode) else unicode(s1)
str2 = s2 if isinstance(s2, unicode) else unicode(s2)
else:
str1 = s1 if isinstance(s1, str) else str(s1)
str2 = s2 if isinstance(s2, str) else str(s2)
if caseless:
return ud.normalize('NFC', str1.lower()) == ud.normalize('NFC', str2.lower())
else: