DeDRM_tools/DeDRM_calibre_plugin/DeDRM_plugin/ineptepub.py

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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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from __future__ import with_statement
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# ineptepub.pyw, version 6.1
# Copyright © 2009-2010 by i♥cabbages
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# Released under the terms of the GNU General Public Licence, version 3
# <http://www.gnu.org/licenses/>
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# Modified 20102013 by some_updates, DiapDealer and Apprentice Alf
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# Windows users: Before running this program, you must first install Python 2.6
# from <http://www.python.org/download/> and PyCrypto from
# <http://www.voidspace.org.uk/python/modules.shtml#pycrypto> (make sure to
# install the version for Python 2.6). Save this script file as
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# ineptepub.pyw and double-click on it to run it.
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#
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# Mac OS X users: Save this script file as ineptepub.pyw. You can run this
# program from the command line (pythonw ineptepub.pyw) or by double-clicking
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# it when it has been associated with PythonLauncher.
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# Revision history:
# 1 - Initial release
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# 2 - Rename to INEPT, fix exit code
# 5 - Version bump to avoid (?) confusion;
# Improve OS X support by using OpenSSL when available
# 5.1 - Improve OpenSSL error checking
# 5.2 - Fix ctypes error causing segfaults on some systems
# 5.3 - add support for OpenSSL on Windows, fix bug with some versions of libcrypto 0.9.8 prior to path level o
# 5.4 - add support for encoding to 'utf-8' when building up list of files to decrypt from encryption.xml
# 5.5 - On Windows try PyCrypto first, OpenSSL next
# 5.6 - Modify interface to allow use with import
# 5.7 - Fix for potential problem with PyCrypto
# 5.8 - Revised to allow use in calibre plugins to eliminate need for duplicate code
# 5.9 - Fixed to retain zip file metadata (e.g. file modification date)
# 6.0 - moved unicode_argv call inside main for Windows DeDRM compatibility
# 6.1 - Work if TkInter is missing
# 6.2 - Handle UTF-8 file names inside an ePub, fix by Jose Luis
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"""
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Decrypt Adobe Digital Editions encrypted ePub books.
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"""
__license__ = 'GPL v3'
__version__ = "6.2"
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import sys
import os
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import traceback
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import zlib
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import zipfile
from zipfile import ZipInfo, ZipFile, ZIP_STORED, ZIP_DEFLATED
from contextlib import closing
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import xml.etree.ElementTree as etree
# 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,unicode):
data = data.encode(self.encoding,"replace")
self.stream.write(data)
self.stream.flush()
def __getattr__(self, attr):
return getattr(self.stream, attr)
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try:
from calibre.constants import iswindows, isosx
except:
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
xrange(start, argc.value)]
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return [u"ineptepub.py"]
else:
argvencoding = sys.stdin.encoding
if argvencoding == None:
argvencoding = "utf-8"
return [arg if (type(arg) == unicode) else unicode(arg,argvencoding) for arg in sys.argv]
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class ADEPTError(Exception):
pass
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def _load_crypto_libcrypto():
from ctypes import CDLL, POINTER, c_void_p, c_char_p, c_int, c_long, \
Structure, c_ulong, create_string_buffer, cast
from ctypes.util import find_library
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if iswindows:
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libcrypto = find_library('libeay32')
else:
libcrypto = find_library('crypto')
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if libcrypto is None:
raise ADEPTError('libcrypto not found')
libcrypto = CDLL(libcrypto)
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RSA_NO_PADDING = 3
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AES_MAXNR = 14
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c_char_pp = POINTER(c_char_p)
c_int_p = POINTER(c_int)
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class RSA(Structure):
pass
RSA_p = POINTER(RSA)
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class AES_KEY(Structure):
_fields_ = [('rd_key', c_long * (4 * (AES_MAXNR + 1))),
('rounds', c_int)]
AES_KEY_p = POINTER(AES_KEY)
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def F(restype, name, argtypes):
func = getattr(libcrypto, name)
func.restype = restype
func.argtypes = argtypes
return func
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d2i_RSAPrivateKey = F(RSA_p, 'd2i_RSAPrivateKey',
[RSA_p, c_char_pp, c_long])
RSA_size = F(c_int, 'RSA_size', [RSA_p])
RSA_private_decrypt = F(c_int, 'RSA_private_decrypt',
[c_int, c_char_p, c_char_p, RSA_p, c_int])
RSA_free = F(None, 'RSA_free', [RSA_p])
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AES_set_decrypt_key = F(c_int, 'AES_set_decrypt_key',
[c_char_p, c_int, AES_KEY_p])
AES_cbc_encrypt = F(None, 'AES_cbc_encrypt',
[c_char_p, c_char_p, c_ulong, AES_KEY_p, c_char_p,
c_int])
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class RSA(object):
def __init__(self, der):
buf = create_string_buffer(der)
pp = c_char_pp(cast(buf, c_char_p))
rsa = self._rsa = d2i_RSAPrivateKey(None, pp, len(der))
if rsa is None:
raise ADEPTError('Error parsing ADEPT user key DER')
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def decrypt(self, from_):
rsa = self._rsa
to = create_string_buffer(RSA_size(rsa))
dlen = RSA_private_decrypt(len(from_), from_, to, rsa,
RSA_NO_PADDING)
if dlen < 0:
raise ADEPTError('RSA decryption failed')
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return to[:dlen]
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def __del__(self):
if self._rsa is not None:
RSA_free(self._rsa)
self._rsa = None
class AES(object):
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def __init__(self, userkey):
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self._blocksize = len(userkey)
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if (self._blocksize != 16) and (self._blocksize != 24) and (self._blocksize != 32) :
raise ADEPTError('AES improper key used')
return
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key = self._key = AES_KEY()
rv = AES_set_decrypt_key(userkey, len(userkey) * 8, key)
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if rv < 0:
raise ADEPTError('Failed to initialize AES key')
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def decrypt(self, data):
out = create_string_buffer(len(data))
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iv = ("\x00" * self._blocksize)
rv = AES_cbc_encrypt(data, out, len(data), self._key, iv, 0)
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if rv == 0:
raise ADEPTError('AES decryption failed')
return out.raw
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return (AES, RSA)
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def _load_crypto_pycrypto():
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from Crypto.Cipher import AES as _AES
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from Crypto.PublicKey import RSA as _RSA
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# ASN.1 parsing code from tlslite
class ASN1Error(Exception):
pass
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class ASN1Parser(object):
class Parser(object):
def __init__(self, bytes):
self.bytes = bytes
self.index = 0
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def get(self, length):
if self.index + length > len(self.bytes):
raise ASN1Error("Error decoding ASN.1")
x = 0
for count in range(length):
x <<= 8
x |= self.bytes[self.index]
self.index += 1
return x
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def getFixBytes(self, lengthBytes):
bytes = self.bytes[self.index : self.index+lengthBytes]
self.index += lengthBytes
return bytes
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def getVarBytes(self, lengthLength):
lengthBytes = self.get(lengthLength)
return self.getFixBytes(lengthBytes)
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def getFixList(self, length, lengthList):
l = [0] * lengthList
for x in range(lengthList):
l[x] = self.get(length)
return l
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def getVarList(self, length, lengthLength):
lengthList = self.get(lengthLength)
if lengthList % length != 0:
raise ASN1Error("Error decoding ASN.1")
lengthList = int(lengthList/length)
l = [0] * lengthList
for x in range(lengthList):
l[x] = self.get(length)
return l
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def startLengthCheck(self, lengthLength):
self.lengthCheck = self.get(lengthLength)
self.indexCheck = self.index
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def setLengthCheck(self, length):
self.lengthCheck = length
self.indexCheck = self.index
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def stopLengthCheck(self):
if (self.index - self.indexCheck) != self.lengthCheck:
raise ASN1Error("Error decoding ASN.1")
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def atLengthCheck(self):
if (self.index - self.indexCheck) < self.lengthCheck:
return False
elif (self.index - self.indexCheck) == self.lengthCheck:
return True
else:
raise ASN1Error("Error decoding ASN.1")
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def __init__(self, bytes):
p = self.Parser(bytes)
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p.get(1)
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self.length = self._getASN1Length(p)
self.value = p.getFixBytes(self.length)
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def getChild(self, which):
p = self.Parser(self.value)
for x in range(which+1):
markIndex = p.index
p.get(1)
length = self._getASN1Length(p)
p.getFixBytes(length)
return ASN1Parser(p.bytes[markIndex:p.index])
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def _getASN1Length(self, p):
firstLength = p.get(1)
if firstLength<=127:
return firstLength
else:
lengthLength = firstLength & 0x7F
return p.get(lengthLength)
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class AES(object):
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def __init__(self, key):
self._aes = _AES.new(key, _AES.MODE_CBC, '\x00'*16)
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def decrypt(self, data):
return self._aes.decrypt(data)
class RSA(object):
def __init__(self, der):
key = ASN1Parser([ord(x) for x in der])
key = [key.getChild(x).value for x in xrange(1, 4)]
key = [self.bytesToNumber(v) for v in key]
self._rsa = _RSA.construct(key)
def bytesToNumber(self, bytes):
total = 0L
for byte in bytes:
total = (total << 8) + byte
return total
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def decrypt(self, data):
return self._rsa.decrypt(data)
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return (AES, RSA)
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def _load_crypto():
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AES = RSA = None
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cryptolist = (_load_crypto_libcrypto, _load_crypto_pycrypto)
if sys.platform.startswith('win'):
cryptolist = (_load_crypto_pycrypto, _load_crypto_libcrypto)
for loader in cryptolist:
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try:
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AES, RSA = loader()
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break
except (ImportError, ADEPTError):
pass
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return (AES, RSA)
AES, RSA = _load_crypto()
META_NAMES = ('mimetype', 'META-INF/rights.xml', 'META-INF/encryption.xml')
NSMAP = {'adept': 'http://ns.adobe.com/adept',
'enc': 'http://www.w3.org/2001/04/xmlenc#'}
class Decryptor(object):
def __init__(self, bookkey, encryption):
enc = lambda tag: '{%s}%s' % (NSMAP['enc'], tag)
self._aes = AES(bookkey)
encryption = etree.fromstring(encryption)
self._encrypted = encrypted = set()
expr = './%s/%s/%s' % (enc('EncryptedData'), enc('CipherData'),
enc('CipherReference'))
for elem in encryption.findall(expr):
path = elem.get('URI', None)
if path is not None:
path = path.encode('utf-8')
encrypted.add(path)
def decompress(self, bytes):
dc = zlib.decompressobj(-15)
bytes = dc.decompress(bytes)
ex = dc.decompress('Z') + dc.flush()
if ex:
bytes = bytes + ex
return bytes
def decrypt(self, path, data):
if path.encode('utf-8') in self._encrypted:
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data = self._aes.decrypt(data)[16:]
data = data[:-ord(data[-1])]
data = self.decompress(data)
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return data
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# check file to make check whether it's probably an Adobe Adept encrypted ePub
def adeptBook(inpath):
with closing(ZipFile(open(inpath, 'rb'))) as inf:
namelist = set(inf.namelist())
if 'META-INF/rights.xml' not in namelist or \
'META-INF/encryption.xml' not in namelist:
return False
try:
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rights = etree.fromstring(inf.read('META-INF/rights.xml'))
adept = lambda tag: '{%s}%s' % (NSMAP['adept'], tag)
expr = './/%s' % (adept('encryptedKey'),)
bookkey = ''.join(rights.findtext(expr))
if len(bookkey) == 172:
return True
except:
# if we couldn't check, assume it is
return True
return False
def decryptBook(userkey, inpath, outpath):
if AES is None:
raise ADEPTError(u"PyCrypto or OpenSSL must be installed.")
rsa = RSA(userkey)
with closing(ZipFile(open(inpath, 'rb'))) as inf:
namelist = set(inf.namelist())
if 'META-INF/rights.xml' not in namelist or \
'META-INF/encryption.xml' not in namelist:
print u"{0:s} is DRM-free.".format(os.path.basename(inpath))
return 1
for name in META_NAMES:
namelist.remove(name)
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try:
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rights = etree.fromstring(inf.read('META-INF/rights.xml'))
adept = lambda tag: '{%s}%s' % (NSMAP['adept'], tag)
expr = './/%s' % (adept('encryptedKey'),)
bookkey = ''.join(rights.findtext(expr))
if len(bookkey) != 172:
print u"{0:s} is not a secure Adobe Adept ePub.".format(os.path.basename(inpath))
return 1
bookkey = rsa.decrypt(bookkey.decode('base64'))
# Padded as per RSAES-PKCS1-v1_5
if bookkey[-17] != '\x00':
print u"Could not decrypt {0:s}. Wrong key".format(os.path.basename(inpath))
return 2
encryption = inf.read('META-INF/encryption.xml')
decryptor = Decryptor(bookkey[-16:], encryption)
kwds = dict(compression=ZIP_DEFLATED, allowZip64=False)
with closing(ZipFile(open(outpath, 'wb'), 'w', **kwds)) as outf:
zi = ZipInfo('mimetype')
zi.compress_type=ZIP_STORED
try:
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# if the mimetype is present, get its info, including time-stamp
oldzi = inf.getinfo('mimetype')
# copy across fields to be preserved
zi.date_time = oldzi.date_time
zi.comment = oldzi.comment
zi.extra = oldzi.extra
zi.internal_attr = oldzi.internal_attr
# external attributes are dependent on the create system, so copy both.
zi.external_attr = oldzi.external_attr
zi.create_system = oldzi.create_system
except:
pass
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outf.writestr(zi, inf.read('mimetype'))
for path in namelist:
data = inf.read(path)
zi = ZipInfo(path)
zi.compress_type=ZIP_DEFLATED
try:
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# get the file info, including time-stamp
oldzi = inf.getinfo(path)
# copy across useful fields
zi.date_time = oldzi.date_time
zi.comment = oldzi.comment
zi.extra = oldzi.extra
zi.internal_attr = oldzi.internal_attr
# external attributes are dependent on the create system, so copy both.
zi.external_attr = oldzi.external_attr
zi.create_system = oldzi.create_system
except:
pass
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outf.writestr(zi, decryptor.decrypt(path, data))
except:
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print u"Could not decrypt {0:s} because of an exception:\n{1:s}".format(os.path.basename(inpath), traceback.format_exc())
return 2
return 0
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def cli_main():
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sys.stdout=SafeUnbuffered(sys.stdout)
sys.stderr=SafeUnbuffered(sys.stderr)
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argv=unicode_argv()
progname = os.path.basename(argv[0])
if len(argv) != 4:
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print u"usage: {0} <keyfile.der> <inbook.epub> <outbook.epub>".format(progname)
return 1
keypath, inpath, outpath = argv[1:]
userkey = open(keypath,'rb').read()
result = decryptBook(userkey, inpath, outpath)
if result == 0:
print u"Successfully decrypted {0:s} as {1:s}".format(os.path.basename(inpath),os.path.basename(outpath))
return result
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def gui_main():
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try:
import Tkinter
import Tkconstants
import tkMessageBox
import traceback
except:
return cli_main()
class DecryptionDialog(Tkinter.Frame):
def __init__(self, root):
Tkinter.Frame.__init__(self, root, border=5)
self.status = Tkinter.Label(self, text=u"Select files for decryption")
self.status.pack(fill=Tkconstants.X, expand=1)
body = Tkinter.Frame(self)
body.pack(fill=Tkconstants.X, expand=1)
sticky = Tkconstants.E + Tkconstants.W
body.grid_columnconfigure(1, weight=2)
Tkinter.Label(body, text=u"Key file").grid(row=0)
self.keypath = Tkinter.Entry(body, width=30)
self.keypath.grid(row=0, column=1, sticky=sticky)
if os.path.exists(u"adeptkey.der"):
self.keypath.insert(0, u"adeptkey.der")
button = Tkinter.Button(body, text=u"...", command=self.get_keypath)
button.grid(row=0, column=2)
Tkinter.Label(body, text=u"Input file").grid(row=1)
self.inpath = Tkinter.Entry(body, width=30)
self.inpath.grid(row=1, column=1, sticky=sticky)
button = Tkinter.Button(body, text=u"...", command=self.get_inpath)
button.grid(row=1, column=2)
Tkinter.Label(body, text=u"Output file").grid(row=2)
self.outpath = Tkinter.Entry(body, width=30)
self.outpath.grid(row=2, column=1, sticky=sticky)
button = Tkinter.Button(body, text=u"...", command=self.get_outpath)
button.grid(row=2, column=2)
buttons = Tkinter.Frame(self)
buttons.pack()
botton = Tkinter.Button(
buttons, text=u"Decrypt", width=10, command=self.decrypt)
botton.pack(side=Tkconstants.LEFT)
Tkinter.Frame(buttons, width=10).pack(side=Tkconstants.LEFT)
button = Tkinter.Button(
buttons, text=u"Quit", width=10, command=self.quit)
button.pack(side=Tkconstants.RIGHT)
def get_keypath(self):
keypath = tkFileDialog.askopenfilename(
parent=None, title=u"Select Adobe Adept \'.der\' key file",
defaultextension=u".der",
filetypes=[('Adobe Adept DER-encoded files', '.der'),
('All Files', '.*')])
if keypath:
keypath = os.path.normpath(keypath)
self.keypath.delete(0, Tkconstants.END)
self.keypath.insert(0, keypath)
return
def get_inpath(self):
inpath = tkFileDialog.askopenfilename(
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parent=None, title=u"Select ADEPT-encrypted ePub file to decrypt",
defaultextension=u".epub", filetypes=[('ePub files', '.epub')])
if inpath:
inpath = os.path.normpath(inpath)
self.inpath.delete(0, Tkconstants.END)
self.inpath.insert(0, inpath)
return
def get_outpath(self):
outpath = tkFileDialog.asksaveasfilename(
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parent=None, title=u"Select unencrypted ePub file to produce",
defaultextension=u".epub", filetypes=[('ePub files', '.epub')])
if outpath:
outpath = os.path.normpath(outpath)
self.outpath.delete(0, Tkconstants.END)
self.outpath.insert(0, outpath)
return
def decrypt(self):
keypath = self.keypath.get()
inpath = self.inpath.get()
outpath = self.outpath.get()
if not keypath or not os.path.exists(keypath):
self.status['text'] = u"Specified key file does not exist"
return
if not inpath or not os.path.exists(inpath):
self.status['text'] = u"Specified input file does not exist"
return
if not outpath:
self.status['text'] = u"Output file not specified"
return
if inpath == outpath:
self.status['text'] = u"Must have different input and output files"
return
userkey = open(keypath,'rb').read()
self.status['text'] = u"Decrypting..."
try:
decrypt_status = decryptBook(userkey, inpath, outpath)
except Exception, e:
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self.status['text'] = u"Error: {0}".format(e.args[0])
return
if decrypt_status == 0:
self.status['text'] = u"File successfully decrypted"
else:
self.status['text'] = u"The was an error decrypting the file."
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root = Tkinter.Tk()
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root.title(u"Adobe Adept ePub Decrypter v.{0}".format(__version__))
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root.resizable(True, False)
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root.minsize(300, 0)
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DecryptionDialog(root).pack(fill=Tkconstants.X, expand=1)
root.mainloop()
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return 0
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if __name__ == '__main__':
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if len(sys.argv) > 1:
sys.exit(cli_main())
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sys.exit(gui_main())