553 lines
22 KiB
Python
Executable File
553 lines
22 KiB
Python
Executable File
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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# mobidedrm.py
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# Copyright © 2008 The Dark Reverser
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# Portions © 2008–2020 Apprentice Harper et al.
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from __future__ import print_function
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__license__ = 'GPL v3'
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__version__ = "1.1"
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# This is a python script. You need a Python interpreter to run it.
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# For example, ActiveState Python, which exists for windows.
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#
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# Changelog
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# 0.01 - Initial version
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# 0.02 - Huffdic compressed books were not properly decrypted
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# 0.03 - Wasn't checking MOBI header length
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# 0.04 - Wasn't sanity checking size of data record
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# 0.05 - It seems that the extra data flags take two bytes not four
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# 0.06 - And that low bit does mean something after all :-)
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# 0.07 - The extra data flags aren't present in MOBI header < 0xE8 in size
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# 0.08 - ...and also not in Mobi header version < 6
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# 0.09 - ...but they are there with Mobi header version 6, header size 0xE4!
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# 0.10 - Outputs unencrypted files as-is, so that when run as a Calibre
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# import filter it works when importing unencrypted files.
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# Also now handles encrypted files that don't need a specific PID.
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# 0.11 - use autoflushed stdout and proper return values
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# 0.12 - Fix for problems with metadata import as Calibre plugin, report errors
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# 0.13 - Formatting fixes: retabbed file, removed trailing whitespace
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# and extra blank lines, converted CR/LF pairs at ends of each line,
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# and other cosmetic fixes.
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# 0.14 - Working out when the extra data flags are present has been problematic
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# Versions 7 through 9 have tried to tweak the conditions, but have been
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# only partially successful. Closer examination of lots of sample
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# files reveals that a confusion has arisen because trailing data entries
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# are not encrypted, but it turns out that the multibyte entries
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# in utf8 file are encrypted. (Although neither kind gets compressed.)
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# This knowledge leads to a simplification of the test for the
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# trailing data byte flags - version 5 and higher AND header size >= 0xE4.
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# 0.15 - Now outputs 'heartbeat', and is also quicker for long files.
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# 0.16 - And reverts to 'done' not 'done.' at the end for unswindle compatibility.
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# 0.17 - added modifications to support its use as an imported python module
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# both inside calibre and also in other places (ie K4DeDRM tools)
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# 0.17a- disabled the standalone plugin feature since a plugin can not import
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# a plugin
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# 0.18 - It seems that multibyte entries aren't encrypted in a v7 file...
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# Removed the disabled Calibre plug-in code
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# Permit use of 8-digit PIDs
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# 0.19 - It seems that multibyte entries aren't encrypted in a v6 file either.
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# 0.20 - Correction: It seems that multibyte entries are encrypted in a v6 file.
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# 0.21 - Added support for multiple pids
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# 0.22 - revised structure to hold MobiBook as a class to allow an extended interface
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# 0.23 - fixed problem with older files with no EXTH section
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# 0.24 - add support for type 1 encryption and 'TEXtREAd' books as well
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# 0.25 - Fixed support for 'BOOKMOBI' type 1 encryption
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# 0.26 - Now enables Text-To-Speech flag and sets clipping limit to 100%
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# 0.27 - Correct pid metadata token generation to match that used by skindle (Thank You Bart!)
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# 0.28 - slight additional changes to metadata token generation (None -> '')
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# 0.29 - It seems that the ideas about when multibyte trailing characters were
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# included in the encryption were wrong. They are for DOC compressed
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# files, but they are not for HUFF/CDIC compress files!
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# 0.30 - Modified interface slightly to work better with new calibre plugin style
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# 0.31 - The multibyte encrytion info is true for version 7 files too.
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# 0.32 - Added support for "Print Replica" Kindle ebooks
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# 0.33 - Performance improvements for large files (concatenation)
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# 0.34 - Performance improvements in decryption (libalfcrypto)
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# 0.35 - add interface to get mobi_version
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# 0.36 - fixed problem with TEXtREAd and getBookTitle interface
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# 0.37 - Fixed double announcement for stand-alone operation
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# 0.38 - Unicode used wherever possible, cope with absent alfcrypto
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# 0.39 - Fixed problem with TEXtREAd and getBookType interface
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# 0.40 - moved unicode_argv call inside main for Windows DeDRM compatibility
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# 0.41 - Fixed potential unicode problem in command line calls
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# 0.42 - Added GPL v3 licence. updated/removed some print statements
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# 1.0 - Python 3 compatibility for calibre 5.0
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# 1.1 - Speed Python PC1 implementation up a little bit
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import sys
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import os
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import struct
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import binascii
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try:
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from alfcrypto import Pukall_Cipher
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except:
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print("AlfCrypto not found. Using python PC1 implementation.")
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from utilities import SafeUnbuffered
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iswindows = sys.platform.startswith('win')
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isosx = sys.platform.startswith('darwin')
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def unicode_argv():
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if iswindows:
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# Uses shell32.GetCommandLineArgvW to get sys.argv as a list of Unicode
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# strings.
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# Versions 2.x of Python don't support Unicode in sys.argv on
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# Windows, with the underlying Windows API instead replacing multi-byte
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# characters with '?'.
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from ctypes import POINTER, byref, cdll, c_int, windll
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from ctypes.wintypes import LPCWSTR, LPWSTR
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GetCommandLineW = cdll.kernel32.GetCommandLineW
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GetCommandLineW.argtypes = []
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GetCommandLineW.restype = LPCWSTR
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CommandLineToArgvW = windll.shell32.CommandLineToArgvW
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CommandLineToArgvW.argtypes = [LPCWSTR, POINTER(c_int)]
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CommandLineToArgvW.restype = POINTER(LPWSTR)
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cmd = GetCommandLineW()
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argc = c_int(0)
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argv = CommandLineToArgvW(cmd, byref(argc))
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if argc.value > 0:
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# Remove Python executable and commands if present
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start = argc.value - len(sys.argv)
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return [argv[i] for i in
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range(start, argc.value)]
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# if we don't have any arguments at all, just pass back script name
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# this should never happen
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return ["mobidedrm.py"]
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else:
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argvencoding = sys.stdin.encoding or "utf-8"
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return [arg if (isinstance(arg, str) or isinstance(arg,unicode)) else str(arg, argvencoding) for arg in sys.argv]
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class DrmException(Exception):
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pass
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#
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# MobiBook Utility Routines
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#
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# Implementation of Pukall Cipher 1
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def PC1(key, src, decryption=True):
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# if we can get it from alfcrypto, use that
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try:
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return Pukall_Cipher().PC1(key,src,decryption)
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except NameError:
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pass
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except TypeError:
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pass
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# use slow python version, since Pukall_Cipher didn't load
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sum1 = 0;
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sum2 = 0;
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keyXorVal = 0;
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if len(key)!=16:
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DrmException ("PC1: Bad key length")
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wkey = []
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for i in range(8):
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wkey.append(key[i*2]<<8 | key[i*2+1])
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dst = bytearray(len(src))
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for i in range(len(src)):
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temp1 = 0;
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byteXorVal = 0;
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for j in range(8):
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temp1 ^= wkey[j]
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sum2 = (sum2+j)*20021 + sum1
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sum1 = (temp1*346)&0xFFFF
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sum2 = (sum2+sum1)&0xFFFF
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temp1 = (temp1*20021+1)&0xFFFF
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byteXorVal ^= temp1 ^ sum2
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curByte = src[i]
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if not decryption:
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keyXorVal = curByte * 257;
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curByte = ((curByte ^ (byteXorVal >> 8)) ^ byteXorVal) & 0xFF
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if decryption:
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keyXorVal = curByte * 257;
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for j in range(8):
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wkey[j] ^= keyXorVal;
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dst[i] = curByte
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return bytes(dst)
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# accepts unicode returns unicode
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def checksumPid(s):
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letters = 'ABCDEFGHIJKLMNPQRSTUVWXYZ123456789'
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crc = (~binascii.crc32(s.encode('utf-8'),-1))&0xFFFFFFFF
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crc = crc ^ (crc >> 16)
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res = s
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l = len(letters)
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for i in (0,1):
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b = crc & 0xff
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pos = (b // l) ^ (b % l)
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res += letters[pos%l]
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crc >>= 8
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return res
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# expects bytearray
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def getSizeOfTrailingDataEntries(ptr, size, flags):
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def getSizeOfTrailingDataEntry(ptr, size):
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bitpos, result = 0, 0
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if size <= 0:
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return result
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while True:
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v = ptr[size-1]
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result |= (v & 0x7F) << bitpos
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bitpos += 7
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size -= 1
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if (v & 0x80) != 0 or (bitpos >= 28) or (size == 0):
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return result
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num = 0
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testflags = flags >> 1
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while testflags:
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if testflags & 1:
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num += getSizeOfTrailingDataEntry(ptr, size - num)
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testflags >>= 1
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# Check the low bit to see if there's multibyte data present.
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# if multibyte data is included in the encryped data, we'll
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# have already cleared this flag.
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if flags & 1:
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num += (ptr[size - num - 1] & 0x3) + 1
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return num
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class MobiBook:
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def loadSection(self, section):
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if (section + 1 == self.num_sections):
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endoff = len(self.data_file)
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else:
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endoff = self.sections[section + 1][0]
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off = self.sections[section][0]
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return self.data_file[off:endoff]
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def cleanup(self):
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# to match function in Topaz book
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pass
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def __init__(self, infile):
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print("MobiDeDrm v{0:s}.\nCopyright © 2008-2020 The Dark Reverser, Apprentice Harper et al.".format(__version__))
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try:
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from alfcrypto import Pukall_Cipher
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except:
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print("AlfCrypto not found. Using python PC1 implementation.")
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# initial sanity check on file
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self.data_file = open(infile, 'rb').read()
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self.mobi_data = ''
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self.header = self.data_file[0:78]
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if self.header[0x3C:0x3C+8] != b'BOOKMOBI' and self.header[0x3C:0x3C+8] != b'TEXtREAd':
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raise DrmException("Invalid file format")
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self.magic = self.header[0x3C:0x3C+8]
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self.crypto_type = -1
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# build up section offset and flag info
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self.num_sections, = struct.unpack('>H', self.header[76:78])
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self.sections = []
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for i in range(self.num_sections):
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offset, a1,a2,a3,a4 = struct.unpack('>LBBBB', self.data_file[78+i*8:78+i*8+8])
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flags, val = a1, a2<<16|a3<<8|a4
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self.sections.append( (offset, flags, val) )
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# parse information from section 0
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self.sect = self.loadSection(0)
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self.records, = struct.unpack('>H', self.sect[0x8:0x8+2])
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self.compression, = struct.unpack('>H', self.sect[0x0:0x0+2])
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# det default values before PalmDoc test
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self.print_replica = False
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self.extra_data_flags = 0
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self.meta_array = {}
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self.mobi_length = 0
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self.mobi_codepage = 1252
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self.mobi_version = -1
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if self.magic == b'TEXtREAd':
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print("PalmDoc format book detected.")
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return
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self.mobi_length, = struct.unpack('>L',self.sect[0x14:0x18])
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self.mobi_codepage, = struct.unpack('>L',self.sect[0x1c:0x20])
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self.mobi_version, = struct.unpack('>L',self.sect[0x68:0x6C])
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#print "MOBI header version {0:d}, header length {1:d}".format(self.mobi_version, self.mobi_length)
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if (self.mobi_length >= 0xE4) and (self.mobi_version >= 5):
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self.extra_data_flags, = struct.unpack('>H', self.sect[0xF2:0xF4])
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#print "Extra Data Flags: {0:d}".format(self.extra_data_flags)
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if (self.compression != 17480):
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# multibyte utf8 data is included in the encryption for PalmDoc compression
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# so clear that byte so that we leave it to be decrypted.
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self.extra_data_flags &= 0xFFFE
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# if exth region exists parse it for metadata array
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try:
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exth_flag, = struct.unpack('>L', self.sect[0x80:0x84])
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exth = b''
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if exth_flag & 0x40:
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exth = self.sect[16 + self.mobi_length:]
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if (len(exth) >= 12) and (exth[:4] == b'EXTH'):
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nitems, = struct.unpack('>I', exth[8:12])
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pos = 12
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for i in range(nitems):
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type, size = struct.unpack('>II', exth[pos: pos + 8])
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content = exth[pos + 8: pos + size]
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self.meta_array[type] = content
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# reset the text to speech flag and clipping limit, if present
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if type == 401 and size == 9:
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# set clipping limit to 100%
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self.patchSection(0, b'\144', 16 + self.mobi_length + pos + 8)
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elif type == 404 and size == 9:
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# make sure text to speech is enabled
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self.patchSection(0, b'\0', 16 + self.mobi_length + pos + 8)
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elif type == 405 and size == 9:
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# remove rented book flag
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self.patchSection(0, b'\0', 16 + self.mobi_length + pos + 8)
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elif type == 406 and size == 16:
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# remove rental due date
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self.patchSection(0, b'\0'*8, 16 + self.mobi_length + pos + 8)
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elif type == 208:
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# remove watermark (atv:kin: stuff)
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self.patchSection(0, b'\0'*(size-8), 16 + self.mobi_length + pos + 8)
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# print type, size, content, content.encode('hex')
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pos += size
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except Exception as e:
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print("Cannot set meta_array: Error: {:s}".format(e.args[0]))
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#returns unicode
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def getBookTitle(self):
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codec_map = {
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1252 : 'windows-1252',
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65001 : 'utf-8',
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}
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title = b''
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codec = 'windows-1252'
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if self.magic == b'BOOKMOBI':
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if 503 in self.meta_array:
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title = self.meta_array[503]
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else:
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toff, tlen = struct.unpack('>II', self.sect[0x54:0x5c])
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tend = toff + tlen
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title = self.sect[toff:tend]
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if self.mobi_codepage in codec_map.keys():
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codec = codec_map[self.mobi_codepage]
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if title == b'':
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title = self.header[:32]
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title = title.split(b'\0')[0]
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return title.decode(codec)
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def getPIDMetaInfo(self):
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rec209 = b''
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token = b''
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if 209 in self.meta_array:
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rec209 = self.meta_array[209]
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data = rec209
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# The 209 data comes in five byte groups. Interpret the last four bytes
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# of each group as a big endian unsigned integer to get a key value
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# if that key exists in the meta_array, append its contents to the token
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for i in range(0,len(data),5):
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val, = struct.unpack('>I',data[i+1:i+5])
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sval = self.meta_array.get(val,b'')
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token += sval
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return rec209, token
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# new must be byte array
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def patch(self, off, new):
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self.data_file = self.data_file[:off] + new + self.data_file[off+len(new):]
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# new must be byte array
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def patchSection(self, section, new, in_off = 0):
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if (section + 1 == self.num_sections):
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endoff = len(self.data_file)
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else:
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endoff = self.sections[section + 1][0]
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off = self.sections[section][0]
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assert off + in_off + len(new) <= endoff
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self.patch(off + in_off, new)
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# pids in pidlist must be unicode, returned key is byte array, pid is unicode
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def parseDRM(self, data, count, pidlist):
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found_key = None
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keyvec1 = b'\x72\x38\x33\xB0\xB4\xF2\xE3\xCA\xDF\x09\x01\xD6\xE2\xE0\x3F\x96'
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for pid in pidlist:
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bigpid = pid.encode('utf-8').ljust(16,b'\0')
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temp_key = PC1(keyvec1, bigpid, False)
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temp_key_sum = sum(temp_key) & 0xff
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found_key = None
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for i in range(count):
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verification, size, type, cksum, cookie = struct.unpack('>LLLBxxx32s', data[i*0x30:i*0x30+0x30])
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if cksum == temp_key_sum:
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cookie = PC1(temp_key, cookie)
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ver,flags,finalkey,expiry,expiry2 = struct.unpack('>LL16sLL', cookie)
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if verification == ver and (flags & 0x1F) == 1:
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found_key = finalkey
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break
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if found_key != None:
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break
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if not found_key:
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# Then try the default encoding that doesn't require a PID
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pid = '00000000'
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temp_key = keyvec1
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temp_key_sum = sum(temp_key) & 0xff
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for i in range(count):
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verification, size, type, cksum, cookie = struct.unpack('>LLLBxxx32s', data[i*0x30:i*0x30+0x30])
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if cksum == temp_key_sum:
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cookie = PC1(temp_key, cookie)
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ver,flags,finalkey,expiry,expiry2 = struct.unpack('>LL16sLL', cookie)
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if verification == ver:
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found_key = finalkey
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break
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return [found_key,pid]
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def getFile(self, outpath):
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open(outpath,'wb').write(self.mobi_data)
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def getBookType(self):
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if self.print_replica:
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return "Print Replica"
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if self.mobi_version >= 8:
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return "Kindle Format 8"
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if self.mobi_version >= 0:
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return "Mobipocket {0:d}".format(self.mobi_version)
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return "PalmDoc"
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def getBookExtension(self):
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if self.print_replica:
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return ".azw4"
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if self.mobi_version >= 8:
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return ".azw3"
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return ".mobi"
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# pids in pidlist may be unicode or bytearrays or bytes
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def processBook(self, pidlist):
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crypto_type, = struct.unpack('>H', self.sect[0xC:0xC+2])
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print("Crypto Type is: {0:d}".format(crypto_type))
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self.crypto_type = crypto_type
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if crypto_type == 0:
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print("This book is not encrypted.")
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# we must still check for Print Replica
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self.print_replica = (self.loadSection(1)[0:4] == b'%MOP')
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self.mobi_data = self.data_file
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return
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if crypto_type != 2 and crypto_type != 1:
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raise DrmException("Cannot decode unknown Mobipocket encryption type {0:d}".format(crypto_type))
|
||
if 406 in self.meta_array:
|
||
data406 = self.meta_array[406]
|
||
val406, = struct.unpack('>Q',data406)
|
||
if val406 != 0:
|
||
print("Warning: This is a library or rented ebook ({0}). Continuing ...".format(val406))
|
||
#raise DrmException("Cannot decode library or rented ebooks.")
|
||
|
||
goodpids = []
|
||
# print("DEBUG ==== pidlist = ", pidlist)
|
||
for pid in pidlist:
|
||
if isinstance(pid,(bytearray,bytes)):
|
||
pid = pid.decode('utf-8')
|
||
if len(pid)==10:
|
||
if checksumPid(pid[0:-2]) != pid:
|
||
print("Warning: PID {0} has incorrect checksum, should have been {1}".format(pid,checksumPid(pid[0:-2])))
|
||
goodpids.append(pid[0:-2])
|
||
elif len(pid)==8:
|
||
goodpids.append(pid)
|
||
else:
|
||
print("Warning: PID {0} has wrong number of digits".format(pid))
|
||
|
||
# print("======= DEBUG good pids = ", goodpids)
|
||
|
||
if self.crypto_type == 1:
|
||
t1_keyvec = b'QDCVEPMU675RUBSZ'
|
||
if self.magic == b'TEXtREAd':
|
||
bookkey_data = self.sect[0x0E:0x0E+16]
|
||
elif self.mobi_version < 0:
|
||
bookkey_data = self.sect[0x90:0x90+16]
|
||
else:
|
||
bookkey_data = self.sect[self.mobi_length+16:self.mobi_length+32]
|
||
pid = '00000000'
|
||
found_key = PC1(t1_keyvec, bookkey_data)
|
||
else :
|
||
# calculate the keys
|
||
drm_ptr, drm_count, drm_size, drm_flags = struct.unpack('>LLLL', self.sect[0xA8:0xA8+16])
|
||
if drm_count == 0:
|
||
raise DrmException("Encryption not initialised. Must be opened with Mobipocket Reader first.")
|
||
found_key, pid = self.parseDRM(self.sect[drm_ptr:drm_ptr+drm_size], drm_count, goodpids)
|
||
if not found_key:
|
||
raise DrmException("No key found in {0:d} PIDs tried.".format(len(goodpids)))
|
||
# kill the drm keys
|
||
self.patchSection(0, b'\0' * drm_size, drm_ptr)
|
||
# kill the drm pointers
|
||
self.patchSection(0, b'\xff' * 4 + b'\0' * 12, 0xA8)
|
||
|
||
if pid=='00000000':
|
||
print("File has default encryption, no specific key needed.")
|
||
else:
|
||
print("File is encoded with PID {0}.".format(checksumPid(pid)))
|
||
|
||
# clear the crypto type
|
||
self.patchSection(0, b'\0' * 2, 0xC)
|
||
|
||
# decrypt sections
|
||
print("Decrypting. Please wait . . .", end=' ')
|
||
mobidataList = []
|
||
mobidataList.append(self.data_file[:self.sections[1][0]])
|
||
for i in range(1, self.records+1):
|
||
data = self.loadSection(i)
|
||
extra_size = getSizeOfTrailingDataEntries(data, len(data), self.extra_data_flags)
|
||
if i%100 == 0:
|
||
print(".", end=' ')
|
||
# print "record %d, extra_size %d" %(i,extra_size)
|
||
decoded_data = PC1(found_key, data[0:len(data) - extra_size])
|
||
if i==1:
|
||
self.print_replica = (decoded_data[0:4] == b'%MOP')
|
||
mobidataList.append(decoded_data)
|
||
if extra_size > 0:
|
||
mobidataList.append(data[-extra_size:])
|
||
if self.num_sections > self.records+1:
|
||
mobidataList.append(self.data_file[self.sections[self.records+1][0]:])
|
||
self.mobi_data = b''.join(mobidataList)
|
||
print("done")
|
||
return
|
||
|
||
# pids in pidlist must be unicode
|
||
def getUnencryptedBook(infile,pidlist):
|
||
if not os.path.isfile(infile):
|
||
raise DrmException("Input File Not Found.")
|
||
book = MobiBook(infile)
|
||
book.processBook(pidlist)
|
||
return book.mobi_data
|
||
|
||
|
||
def cli_main():
|
||
argv=unicode_argv()
|
||
progname = os.path.basename(argv[0])
|
||
if len(argv)<3 or len(argv)>4:
|
||
print("MobiDeDrm v{0:s}.\nCopyright © 2008-2020 The Dark Reverser, Apprentice Harper et al.".format(__version__))
|
||
print("Removes protection from Kindle/Mobipocket, Kindle/KF8 and Kindle/Print Replica ebooks")
|
||
print("Usage:")
|
||
print(" {0} <infile> <outfile> [<Comma separated list of PIDs to try>]".format(progname))
|
||
return 1
|
||
else:
|
||
infile = argv[1]
|
||
outfile = argv[2]
|
||
if len(argv) == 4:
|
||
pidlist = argv[3].split(',')
|
||
else:
|
||
pidlist = []
|
||
try:
|
||
stripped_file = getUnencryptedBook(infile, pidlist)
|
||
open(outfile, 'wb').write(stripped_file)
|
||
except DrmException as e:
|
||
print("MobiDeDRM v{0} Error: {1:s}".format(__version__,e.args[0]))
|
||
return 1
|
||
return 0
|
||
|
||
|
||
if __name__ == '__main__':
|
||
sys.stdout=SafeUnbuffered(sys.stdout)
|
||
sys.stderr=SafeUnbuffered(sys.stderr)
|
||
sys.exit(cli_main())
|