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ineptpdf v2

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i♥cabbages 2009-07-09 14:03:43 +01:00 committed by Apprentice Alf
parent a186ae1c5a
commit a180fcacb2
1 changed files with 9 additions and 8 deletions
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17
ineptpdf.pyw
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@ -1,6 +1,6 @@
#! /usr/bin/python
# ineptpdf.pyw, version 1
# ineptpdf.pyw, version 2
# To run this program install Python 2.6 from http://www.python.org/download/
# and PyCrypto from http://www.voidspace.org.uk/python/modules.shtml#pycrypto
@ -9,6 +9,7 @@
# Revision history:
# 1 - Initial release
# 2 - Improved determination of key-generation algorithm
"""
Decrypt Adobe ADEPT-encrypted PDF files.
@ -1013,7 +1014,6 @@ class PDFDocument(object):
raise PDFEncryptionError('Unknown filter: param=%r' % param)
def initialize_ebx(self, password, docid, param):
V = int_value(param.get('V', 0))
self.is_printable = self.is_modifiable = self.is_extractable = True
with open(password, 'rb') as f:
keyder = f.read()
@ -1030,14 +1030,15 @@ class PDFDocument(object):
if bookkey[0] != '\x02':
raise ADEPTError('error decrypting book session key')
index = bookkey.index('\0') + 1
if V == 3:
if bookkey[index] != '\x03':
raise ADEPTError('error decrypting book session key')
index += 1
bookkey = bookkey[index:]
if len(bookkey) != length:
V = 2
if (length and len(bookkey) == (length + 1)) or \
(not length and len(bookkey) & 1 == 1):
V = ord(bookkey[0])
bookkey = bookkey[1:]
if length and len(bookkey) != length:
raise ADEPTError('error decrypting book session key')
self.decrypt_key = bookkey[-length:]
self.decrypt_key = bookkey
self.genkey = self.genkey_v3 if V == 3 else self.genkey_v2
self.decipher = self.decrypt_rc4
self.ready = True