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Apprentice Alf
19
Barnes_and_Noble_EPUB_Tools/README_ignoble_epub.txt
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19
Barnes_and_Noble_EPUB_Tools/README_ignoble_epub.txt
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@@ -0,0 +1,19 @@
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Readme.txt
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Barnes and Noble EPUB ebooks use a form of Social DRM which requires information on your Credit Card Number and the Name on the Credit card used to purchase the book to actually unencrypt the book.
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For more info, see the author's blog:
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http://i-u2665-cabbages.blogspot.com/2009_12_01_archive.html
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The original scripts by IHeartCabbages are available here as well. These scripts have been modified to allow the use of OpenSSL in place of PyCrypto to make them easier to run on Linux and Mac OS X.
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There are 2 scripts:
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The first is ignoblekeygen_v2.pyw. Double-click to launch it and provide the required information, and this program will generate a key file needed to remove the DRM from the books. This key file need only be generated once unless either you change your credit card number or your name on the credit card (or if you use a different credit card to purchase your book).
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The second is ignobleepub_v3.pyw. Double-click it and it will ask for your key file and the path to the book to remove the DRM from.
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All of these scripts are gui python programs. Python 2.X (32 bit) is already installed in Mac OSX. We recommend ActiveState's Active Python Version 2.X (32 bit) for Windows users.
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These scripts are based on the IHeartCabbages original scripts that allow the replacement of the requirement for PyCrypto with OpenSSL's libcrypto which is already installed on all Mac OS X machines and Linux Boxes. Window's Users will still have to install PyCrypto or OpenSSL to get these scripts to work properly.
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@@ -1,18 +1,16 @@
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#! /usr/bin/python
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# ignobleepub.pyw, version 1-rc2
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# ignobleepub.pyw, version 3
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# To run this program install Python 2.6 from <http://www.python.org/download/>
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# and PyCrypto from http://www.voidspace.org.uk/python/modules.shtml#pycrypto
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# and OpenSSL or PyCrypto from http://www.voidspace.org.uk/python/modules.shtml#pycrypto
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# (make sure to install the version for Python 2.6). Save this script file as
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# ignobleepub.pyw and double-click on it to run it.
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# Revision history:
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# 1 - Initial release
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"""
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Decrypt Barnes & Noble ADEPT encrypted EPUB books.
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"""
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# 2 - Added OS X support by using OpenSSL when available
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# 3 - screen out improper key lengths to prevent segfaults on Linux
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from __future__ import with_statement
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@@ -30,10 +28,95 @@ import Tkconstants
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import tkFileDialog
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import tkMessageBox
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try:
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from Crypto.Cipher import AES
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except ImportError:
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class IGNOBLEError(Exception):
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pass
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def _load_crypto_libcrypto():
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from ctypes import CDLL, POINTER, c_void_p, c_char_p, c_int, c_long, \
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Structure, c_ulong, create_string_buffer, cast
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from ctypes.util import find_library
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libcrypto = find_library('crypto')
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if libcrypto is None:
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raise IGNOBLEError('libcrypto not found')
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libcrypto = CDLL(libcrypto)
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AES_MAXNR = 14
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c_char_pp = POINTER(c_char_p)
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c_int_p = POINTER(c_int)
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class AES_KEY(Structure):
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_fields_ = [('rd_key', c_long * (4 * (AES_MAXNR + 1))),
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('rounds', c_int)]
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AES_KEY_p = POINTER(AES_KEY)
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def F(restype, name, argtypes):
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func = getattr(libcrypto, name)
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func.restype = restype
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func.argtypes = argtypes
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return func
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AES_cbc_encrypt = F(None, 'AES_cbc_encrypt',
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[c_char_p, c_char_p, c_ulong, AES_KEY_p, c_char_p,
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c_int])
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AES_set_decrypt_key = F(c_int, 'AES_set_decrypt_key',
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[c_char_p, c_int, AES_KEY_p])
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AES_cbc_encrypt = F(None, 'AES_cbc_encrypt',
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[c_char_p, c_char_p, c_ulong, AES_KEY_p, c_char_p,
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c_int])
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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) :
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raise IGNOBLEError('AES improper key used')
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return
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key = self._key = AES_KEY()
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rv = AES_set_decrypt_key(userkey, len(userkey) * 8, key)
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if rv < 0:
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raise IGNOBLEError('Failed to initialize AES key')
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def decrypt(self, data):
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out = create_string_buffer(len(data))
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iv = ("\x00" * self._blocksize)
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rv = AES_cbc_encrypt(data, out, len(data), self._key, iv, 0)
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if rv == 0:
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raise IGNOBLEError('AES decryption failed')
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return out.raw
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return AES
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def _load_crypto_pycrypto():
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from Crypto.Cipher import AES as _AES
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class AES(object):
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def __init__(self, key):
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self._aes = _AES.new(key, _AES.MODE_CBC)
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def decrypt(self, data):
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return self._aes.decrypt(data)
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return AES
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def _load_crypto():
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AES = None
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for loader in (_load_crypto_libcrypto, _load_crypto_pycrypto):
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try:
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AES = loader()
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break
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except (ImportError, IGNOBLEError):
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pass
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return AES
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AES = _load_crypto()
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"""
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Decrypt Barnes & Noble ADEPT encrypted EPUB books.
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"""
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META_NAMES = ('mimetype', 'META-INF/rights.xml', 'META-INF/encryption.xml')
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NSMAP = {'adept': 'http://ns.adobe.com/adept',
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@@ -49,7 +132,8 @@ class ZipInfo(zipfile.ZipInfo):
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class Decryptor(object):
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def __init__(self, bookkey, encryption):
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enc = lambda tag: '{%s}%s' % (NSMAP['enc'], tag)
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self._aes = AES.new(bookkey, AES.MODE_CBC)
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# self._aes = AES.new(bookkey, AES.MODE_CBC)
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self._aes = AES(bookkey)
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encryption = etree.fromstring(encryption)
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self._encrypted = encrypted = set()
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expr = './%s/%s/%s' % (enc('EncryptedData'), enc('CipherData'),
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@@ -75,13 +159,11 @@ class Decryptor(object):
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return data
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class ADEPTError(Exception):
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pass
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def cli_main(argv=sys.argv):
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progname = os.path.basename(argv[0])
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if AES is None:
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print "%s: This script requires PyCrypto, which must be installed " \
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print "%s: This script requires OpenSSL or PyCrypto, which must be installed " \
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"separately. Read the top-of-script comment for details." % \
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(progname,)
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return 1
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@@ -92,12 +174,14 @@ def cli_main(argv=sys.argv):
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with open(keypath, 'rb') as f:
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keyb64 = f.read()
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key = keyb64.decode('base64')[:16]
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aes = AES.new(key, AES.MODE_CBC)
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# aes = AES.new(key, AES.MODE_CBC)
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aes = AES(key)
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with closing(ZipFile(open(inpath, 'rb'))) as inf:
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namelist = set(inf.namelist())
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if 'META-INF/rights.xml' not in namelist or \
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'META-INF/encryption.xml' not in namelist:
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raise ADEPTError('%s: not an B&N ADEPT EPUB' % (inpath,))
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raise IGNOBLEError('%s: not an B&N ADEPT EPUB' % (inpath,))
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for name in META_NAMES:
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namelist.remove(name)
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rights = etree.fromstring(inf.read('META-INF/rights.xml'))
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@@ -219,7 +303,7 @@ def gui_main():
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root.withdraw()
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tkMessageBox.showerror(
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"Ignoble EPUB Decrypter",
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"This script requires PyCrypto, which must be installed "
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"This script requires OpenSSL or PyCrypto, which must be installed "
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"separately. Read the top-of-script comment for details.")
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return 1
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root.title('Ignoble EPUB Decrypter')
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@@ -1,14 +1,15 @@
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#! /usr/bin/python
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# ignoblekeygen.pyw, version 1
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# ignoblekeygen.pyw, version 2
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# To run this program install Python 2.6 from <http://www.python.org/download/>
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# and PyCrypto from http://www.voidspace.org.uk/python/modules.shtml#pycrypto
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# and OpenSSL or PyCrypto from http://www.voidspace.org.uk/python/modules.shtml#pycrypto
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# (make sure to install the version for Python 2.6). Save this script file as
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# ignoblekeygen.pyw and double-click on it to run it.
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# Revision history:
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# 1 - Initial release
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# 2 - Add OS X support by using OpenSSL when available (taken/modified from ineptepub v5)
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"""
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Generate Barnes & Noble EPUB user key from name and credit card number.
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@@ -26,10 +27,90 @@ import Tkconstants
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import tkFileDialog
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import tkMessageBox
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try:
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from Crypto.Cipher import AES
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except ImportError:
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# use openssl's libcrypt if it exists in place of pycrypto
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# code extracted from the Adobe Adept DRM removal code also by I HeartCabbages
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class IGNOBLEError(Exception):
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pass
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def _load_crypto_libcrypto():
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from ctypes import CDLL, POINTER, c_void_p, c_char_p, c_int, c_long, \
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Structure, c_ulong, create_string_buffer, cast
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from ctypes.util import find_library
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libcrypto = find_library('crypto')
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if libcrypto is None:
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print 'libcrypto not found'
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raise IGNOBLEError('libcrypto not found')
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libcrypto = CDLL(libcrypto)
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AES_MAXNR = 14
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c_char_pp = POINTER(c_char_p)
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c_int_p = POINTER(c_int)
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class AES_KEY(Structure):
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_fields_ = [('rd_key', c_long * (4 * (AES_MAXNR + 1))),
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('rounds', c_int)]
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AES_KEY_p = POINTER(AES_KEY)
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def F(restype, name, argtypes):
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func = getattr(libcrypto, name)
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func.restype = restype
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func.argtypes = argtypes
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return func
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AES_set_encrypt_key = F(c_int, 'AES_set_encrypt_key',
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[c_char_p, c_int, AES_KEY_p])
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AES_cbc_encrypt = F(None, 'AES_cbc_encrypt',
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[c_char_p, c_char_p, c_ulong, AES_KEY_p, c_char_p,
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c_int])
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class AES(object):
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def __init__(self, userkey, iv):
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self._blocksize = len(userkey)
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self._iv = iv
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key = self._key = AES_KEY()
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rv = AES_set_encrypt_key(userkey, len(userkey) * 8, key)
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if rv < 0:
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raise IGNOBLEError('Failed to initialize AES Encrypt key')
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def encrypt(self, data):
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out = create_string_buffer(len(data))
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rv = AES_cbc_encrypt(data, out, len(data), self._key, self._iv, 1)
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if rv == 0:
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raise IGNOBLEError('AES encryption failed')
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return out.raw
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return AES
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def _load_crypto_pycrypto():
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from Crypto.Cipher import AES as _AES
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class AES(object):
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def __init__(self, key, iv):
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self._aes = _AES.new(key, _AES.MODE_CBC, iv)
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def encrypt(self, data):
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return self._aes.encrypt(data)
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return AES
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def _load_crypto():
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AES = None
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for loader in (_load_crypto_libcrypto, _load_crypto_pycrypto):
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try:
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AES = loader()
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break
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except (ImportError, IGNOBLEError):
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pass
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return AES
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AES = _load_crypto()
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def normalize_name(name):
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return ''.join(x for x in name.lower() if x != ' ')
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@@ -40,7 +121,7 @@ def generate_keyfile(name, ccn, outpath):
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name_sha = hashlib.sha1(name).digest()[:16]
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ccn_sha = hashlib.sha1(ccn).digest()[:16]
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both_sha = hashlib.sha1(name + ccn).digest()
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aes = AES.new(ccn_sha, AES.MODE_CBC, name_sha)
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aes = AES(ccn_sha, name_sha)
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crypt = aes.encrypt(both_sha + ('\x0c' * 0x0c))
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userkey = hashlib.sha1(crypt).digest()
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with open(outpath, 'wb') as f:
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@@ -50,7 +131,7 @@ def generate_keyfile(name, ccn, outpath):
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def cli_main(argv=sys.argv):
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progname = os.path.basename(argv[0])
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if AES is None:
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print "%s: This script requires PyCrypto, which must be installed " \
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print "%s: This script requires OpenSSL or PyCrypto, which must be installed " \
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"separately. Read the top-of-script comment for details." % \
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(progname,)
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return 1
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@@ -131,7 +212,7 @@ def gui_main():
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root.withdraw()
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tkMessageBox.showerror(
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"Ignoble EPUB Keyfile Generator",
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"This script requires PyCrypto, which must be installed "
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"This script requires OpenSSL or PyCrypto, which must be installed "
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"separately. Read the top-of-script comment for details.")
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return 1
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root.title('Ignoble EPUB Keyfile Generator')
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