Remove AlfCrypto libraries and perform everything in Python

The old AlfCrypto DLL, SO and DYLIB files are ancient,
I don't have the systems to recompile them all, they
cause issues on ARM Macs, and I doubt with all the Python
improvements over the last years that they have a significant
performance advantage. And even if that's the case, nobody is
importing hundreds of DRM books at the same time so it shouldn't
hurt if some decryptions might take a bit longer.
This commit is contained in:
NoDRM 2022-08-06 20:13:19 +02:00
parent 9276d77f63
commit 410e086d08
10 changed files with 81 additions and 443 deletions

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@ -187,15 +187,12 @@ class DeDRM(FileTypePlugin):
os.mkdir(self.alfdir)
# only continue if we've never run this version of the plugin before
self.verdir = os.path.join(self.maindir,PLUGIN_VERSION)
if not os.path.exists(self.verdir):
if iswindows:
names = ["alfcrypto.dll","alfcrypto64.dll"]
elif isosx:
names = ["libalfcrypto.dylib"]
else:
names = ["libalfcrypto32.so","libalfcrypto64.so","kindlekey.py","adobekey.py","subasyncio.py"]
if not os.path.exists(self.verdir) and not iswindows and not isosx:
names = ["kindlekey.py","adobekey.py","ignoblekeyNookStudy.py"]
lib_dict = self.load_resources(names)
print("{0} v{1}: Copying needed library files from plugin's zip".format(PLUGIN_NAME, PLUGIN_VERSION))
print("{0} v{1}: Copying needed Python scripts from plugin's zip".format(PLUGIN_NAME, PLUGIN_VERSION))
for entry, data in lib_dict.items():
file_path = os.path.join(self.alfdir, entry)

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@ -8,162 +8,9 @@
# pbkdf2.py Copyright © 2009 Daniel Holth <dholth@fastmail.fm>
# pbkdf2.py This code may be freely used and modified for any purpose.
import sys, os
import hmac
from struct import pack
import hashlib
# interface to needed routines libalfcrypto
def _load_libalfcrypto():
import ctypes
from ctypes import CDLL, byref, POINTER, c_void_p, c_char_p, c_int, c_long, \
Structure, c_ulong, create_string_buffer, addressof, string_at, cast, sizeof
pointer_size = ctypes.sizeof(ctypes.c_voidp)
name_of_lib = None
if sys.platform.startswith('darwin'):
name_of_lib = 'libalfcrypto.dylib'
elif sys.platform.startswith('win'):
if pointer_size == 4:
name_of_lib = 'alfcrypto.dll'
else:
name_of_lib = 'alfcrypto64.dll'
else:
if pointer_size == 4:
name_of_lib = 'libalfcrypto32.so'
else:
name_of_lib = 'libalfcrypto64.so'
# hard code to local location for libalfcrypto
libalfcrypto = os.path.join(sys.path[0],name_of_lib)
if not os.path.isfile(libalfcrypto):
libalfcrypto = os.path.join(sys.path[0], 'lib', name_of_lib)
if not os.path.isfile(libalfcrypto):
libalfcrypto = os.path.join('.',name_of_lib)
if not os.path.isfile(libalfcrypto):
raise Exception('libalfcrypto not found at %s' % libalfcrypto)
libalfcrypto = CDLL(libalfcrypto)
c_char_pp = POINTER(c_char_p)
c_int_p = POINTER(c_int)
def F(restype, name, argtypes):
func = getattr(libalfcrypto, name)
func.restype = restype
func.argtypes = argtypes
return func
# aes cbc decryption
#
# struct aes_key_st {
# unsigned long rd_key[4 *(AES_MAXNR + 1)];
# int rounds;
# };
#
# typedef struct aes_key_st AES_KEY;
#
# int AES_set_decrypt_key(const unsigned char *userKey, const int bits, AES_KEY *key);
#
#
# void AES_cbc_encrypt(const unsigned char *in, unsigned char *out,
# const unsigned long length, const AES_KEY *key,
# unsigned char *ivec, const int enc);
AES_MAXNR = 14
class AES_KEY(Structure):
_fields_ = [('rd_key', c_long * (4 * (AES_MAXNR + 1))), ('rounds', c_int)]
AES_KEY_p = POINTER(AES_KEY)
AES_cbc_encrypt = F(None, 'AES_cbc_encrypt',[c_char_p, c_char_p, c_ulong, AES_KEY_p, c_char_p, c_int])
AES_set_decrypt_key = F(c_int, 'AES_set_decrypt_key',[c_char_p, c_int, AES_KEY_p])
# Pukall 1 Cipher
# unsigned char *PC1(const unsigned char *key, unsigned int klen, const unsigned char *src,
# unsigned char *dest, unsigned int len, int decryption);
PC1 = F(c_char_p, 'PC1', [c_char_p, c_ulong, c_char_p, c_char_p, c_ulong, c_ulong])
# Topaz Encryption
# typedef struct _TpzCtx {
# unsigned int v[2];
# } TpzCtx;
#
# void topazCryptoInit(TpzCtx *ctx, const unsigned char *key, int klen);
# void topazCryptoDecrypt(const TpzCtx *ctx, const unsigned char *in, unsigned char *out, int len);
class TPZ_CTX(Structure):
_fields_ = [('v', c_long * 2)]
TPZ_CTX_p = POINTER(TPZ_CTX)
topazCryptoInit = F(None, 'topazCryptoInit', [TPZ_CTX_p, c_char_p, c_ulong])
topazCryptoDecrypt = F(None, 'topazCryptoDecrypt', [TPZ_CTX_p, c_char_p, c_char_p, c_ulong])
class AES_CBC(object):
def __init__(self):
self._blocksize = 0
self._keyctx = None
self._iv = 0
def set_decrypt_key(self, userkey, iv):
self._blocksize = len(userkey)
if (self._blocksize != 16) and (self._blocksize != 24) and (self._blocksize != 32) :
raise Exception('AES CBC improper key used')
return
keyctx = self._keyctx = AES_KEY()
self._iv = iv
rv = AES_set_decrypt_key(userkey, len(userkey) * 8, keyctx)
if rv < 0:
raise Exception('Failed to initialize AES CBC key')
def decrypt(self, data):
out = create_string_buffer(len(data))
mutable_iv = create_string_buffer(self._iv, len(self._iv))
rv = AES_cbc_encrypt(data, out, len(data), self._keyctx, mutable_iv, 0)
if rv == 0:
raise Exception('AES CBC decryption failed')
return out.raw
class Pukall_Cipher(object):
def __init__(self):
self.key = None
def PC1(self, key, src, decryption=True):
self.key = key
out = create_string_buffer(len(src))
de = 0
if decryption:
de = 1
rv = PC1(key, len(key), src, out, len(src), de)
return out.raw
class Topaz_Cipher(object):
def __init__(self):
self._ctx = None
def ctx_init(self, key):
tpz_ctx = self._ctx = TPZ_CTX()
topazCryptoInit(tpz_ctx, key, len(key))
return tpz_ctx
def decrypt(self, data, ctx=None):
if ctx == None:
ctx = self._ctx
out = create_string_buffer(len(data))
topazCryptoDecrypt(ctx, data, out, len(data))
return out.raw
print("Using Library AlfCrypto DLL/DYLIB/SO")
return (AES_CBC, Pukall_Cipher, Topaz_Cipher)
def _load_python_alfcrypto():
import aescbc
class Pukall_Cipher(object):
@ -175,11 +22,11 @@ def _load_python_alfcrypto():
sum2 = 0;
keyXorVal = 0;
if len(key)!=16:
raise Exception('Pukall_Cipher: Bad key length.')
raise Exception("PC1: Bad key length")
wkey = []
for i in range(8):
wkey.append(ord(key[i*2])<<8 | ord(key[i*2+1]))
dst = ""
wkey.append(key[i*2]<<8 | key[i*2+1])
dst = bytearray(len(src))
for i in range(len(src)):
temp1 = 0;
byteXorVal = 0;
@ -190,7 +37,7 @@ def _load_python_alfcrypto():
sum2 = (sum2+sum1)&0xFFFF
temp1 = (temp1*20021+1)&0xFFFF
byteXorVal ^= temp1 ^ sum2
curByte = ord(src[i])
curByte = src[i]
if not decryption:
keyXorVal = curByte * 257;
curByte = ((curByte ^ (byteXorVal >> 8)) ^ byteXorVal) & 0xFF
@ -198,8 +45,8 @@ def _load_python_alfcrypto():
keyXorVal = curByte * 257;
for j in range(8):
wkey[j] ^= keyXorVal;
dst+=chr(curByte)
return dst
dst[i] = curByte
return bytes(dst)
class Topaz_Cipher(object):
def __init__(self):
@ -246,23 +93,6 @@ def _load_python_alfcrypto():
cleartext = self.aes.decrypt(iv + data)
return cleartext
print("Using Library AlfCrypto Python")
return (AES_CBC, Pukall_Cipher, Topaz_Cipher)
def _load_crypto():
AES_CBC = Pukall_Cipher = Topaz_Cipher = None
cryptolist = (_load_libalfcrypto, _load_python_alfcrypto)
for loader in cryptolist:
try:
AES_CBC, Pukall_Cipher, Topaz_Cipher = loader()
break
except (ImportError, Exception):
pass
return AES_CBC, Pukall_Cipher, Topaz_Cipher
AES_CBC, Pukall_Cipher, Topaz_Cipher = _load_crypto()
class KeyIVGen(object):
# this only exists in openssl so we will use pure python implementation instead

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@ -80,10 +80,7 @@ import sys
import os
import struct
import binascii
try:
from alfcrypto import Pukall_Cipher
except:
print("AlfCrypto not found. Using python PC1 implementation.")
from utilities import SafeUnbuffered
@ -140,41 +137,8 @@ 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 = bytearray(len(src))
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[i] = curByte
return bytes(dst)
except:
raise
# accepts unicode returns unicode
def checksumPid(s):
@ -232,12 +196,7 @@ class MobiBook:
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.")
print("MobiDeDrm v{0:s}.\nCopyright © 2008-2022 The Dark Reverser, Apprentice Harper et al.".format(__version__))
# initial sanity check on file
self.data_file = open(infile, 'rb').read()

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@ -1,148 +0,0 @@
#!/usr/bin/env python
# vim:ts=4:sw=4:softtabstop=4:smarttab:expandtab
import os, sys
import signal
import threading
import subprocess
from subprocess import Popen, PIPE, STDOUT
# **heavily** chopped up and modfied version of asyncproc.py
# to make it actually work on Windows as well as Mac/Linux
# For the original see:
# "http://www.lysator.liu.se/~bellman/download/"
# author is "Thomas Bellman <bellman@lysator.liu.se>"
# available under GPL version 3 or Later
# create an asynchronous subprocess whose output can be collected in
# a non-blocking manner
# What a mess! Have to use threads just to get non-blocking io
# in a cross-platform manner
# luckily all thread use is hidden within this class
class Process(object):
def __init__(self, *params, **kwparams):
if len(params) <= 3:
kwparams.setdefault('stdin', subprocess.PIPE)
if len(params) <= 4:
kwparams.setdefault('stdout', subprocess.PIPE)
if len(params) <= 5:
kwparams.setdefault('stderr', subprocess.PIPE)
self.__pending_input = []
self.__collected_outdata = []
self.__collected_errdata = []
self.__exitstatus = None
self.__lock = threading.Lock()
self.__inputsem = threading.Semaphore(0)
self.__quit = False
self.__process = subprocess.Popen(*params, **kwparams)
if self.__process.stdin:
self.__stdin_thread = threading.Thread(
name="stdin-thread",
target=self.__feeder, args=(self.__pending_input,
self.__process.stdin))
self.__stdin_thread.setDaemon(True)
self.__stdin_thread.start()
if self.__process.stdout:
self.__stdout_thread = threading.Thread(
name="stdout-thread",
target=self.__reader, args=(self.__collected_outdata,
self.__process.stdout))
self.__stdout_thread.setDaemon(True)
self.__stdout_thread.start()
if self.__process.stderr:
self.__stderr_thread = threading.Thread(
name="stderr-thread",
target=self.__reader, args=(self.__collected_errdata,
self.__process.stderr))
self.__stderr_thread.setDaemon(True)
self.__stderr_thread.start()
def pid(self):
return self.__process.pid
def kill(self, signal):
self.__process.send_signal(signal)
# check on subprocess (pass in 'nowait') to act like poll
def wait(self, flag):
if flag.lower() == 'nowait':
rc = self.__process.poll()
else:
rc = self.__process.wait()
if rc != None:
if self.__process.stdin:
self.closeinput()
if self.__process.stdout:
self.__stdout_thread.join()
if self.__process.stderr:
self.__stderr_thread.join()
return self.__process.returncode
def terminate(self):
if self.__process.stdin:
self.closeinput()
self.__process.terminate()
# thread gets data from subprocess stdout
def __reader(self, collector, source):
while True:
data = os.read(source.fileno(), 65536)
self.__lock.acquire()
collector.append(data)
self.__lock.release()
if data == "":
source.close()
break
return
# thread feeds data to subprocess stdin
def __feeder(self, pending, drain):
while True:
self.__inputsem.acquire()
self.__lock.acquire()
if not pending and self.__quit:
drain.close()
self.__lock.release()
break
data = pending.pop(0)
self.__lock.release()
drain.write(data)
# non-blocking read of data from subprocess stdout
def read(self):
self.__lock.acquire()
outdata = "".join(self.__collected_outdata)
del self.__collected_outdata[:]
self.__lock.release()
return outdata
# non-blocking read of data from subprocess stderr
def readerr(self):
self.__lock.acquire()
errdata = "".join(self.__collected_errdata)
del self.__collected_errdata[:]
self.__lock.release()
return errdata
# non-blocking write to stdin of subprocess
def write(self, data):
if self.__process.stdin is None:
raise ValueError("Writing to process with stdin not a pipe")
self.__lock.acquire()
self.__pending_input.append(data)
self.__inputsem.release()
self.__lock.release()
# close stdinput of subprocess
def closeinput(self):
self.__lock.acquire()
self.__quit = True
self.__inputsem.release()
self.__lock.release()