mirror
/
DeDRM_tools
kopia lustrzana https://github.com/noDRM/DeDRM_tools
1
0
Forkuj 0
Kod Zgłoszenia Packages Projekty Wydania Wiki Aktywność
DeDRM_tools/DeDRM_plugin/mobidedrm.py

568 wiersze
23 KiB
Python
Executable File
Czysty Wina Historia

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