#! /usr/bin/python

# adeptkey.pyw, version 1

# To run this program 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
# adeptkey.pyw and double-click on it to run it.  It will create a file named
# adeptkey.der in the same directory.  This is your ADEPT user key.

# Revision history:
#   1 - Initial release, for Adobe Digital Editions 1.7

"""
Retrieve Adobe ADEPT user key under Windows.
"""

from __future__ import with_statement

__license__ = 'GPL v3'

import sys
import os
from struct import pack
from ctypes import windll, c_char_p, c_wchar_p, c_uint, POINTER, byref, \
    create_unicode_buffer, create_string_buffer, CFUNCTYPE, addressof, \
    string_at, Structure, c_void_p, cast
import _winreg as winreg
import Tkinter
import tkMessageBox

try:
    from Crypto.Cipher import AES
except ImportError:
    AES = None


DEVICE_KEY = 'Software\\Adobe\\Adept\\Device'
PRIVATE_LICENCE_KEY_KEY = 'Software\\Adobe\\Adept\\Activation\\0000\\0003'

MAX_PATH = 255

kernel32 = windll.kernel32
advapi32 = windll.advapi32
crypt32 = windll.crypt32


def GetSystemDirectory():
    GetSystemDirectoryW = kernel32.GetSystemDirectoryW
    GetSystemDirectoryW.argtypes = [c_wchar_p, c_uint]
    GetSystemDirectoryW.restype = c_uint
    def GetSystemDirectory():
        buffer = create_unicode_buffer(MAX_PATH + 1)
        GetSystemDirectoryW(buffer, len(buffer))
        return buffer.value
    return GetSystemDirectory
GetSystemDirectory = GetSystemDirectory()


def GetVolumeSerialNumber():
    GetVolumeInformationW = kernel32.GetVolumeInformationW
    GetVolumeInformationW.argtypes = [c_wchar_p, c_wchar_p, c_uint,
                                      POINTER(c_uint), POINTER(c_uint),
                                      POINTER(c_uint), c_wchar_p, c_uint]
    GetVolumeInformationW.restype = c_uint
    def GetVolumeSerialNumber(path):
        vsn = c_uint(0)
        GetVolumeInformationW(path, None, 0, byref(vsn), None, None, None, 0)
        return vsn.value
    return GetVolumeSerialNumber
GetVolumeSerialNumber = GetVolumeSerialNumber()


def GetUserName():
    GetUserNameW = advapi32.GetUserNameW
    GetUserNameW.argtypes = [c_wchar_p, POINTER(c_uint)]
    GetUserNameW.restype = c_uint
    def GetUserName():
        buffer = create_unicode_buffer(32)
        size = c_uint(len(buffer))
        while not GetUserNameW(buffer, byref(size)):
            buffer = create_unicode_buffer(len(buffer) * 2)
            size.value = len(buffer)
        return buffer.value.encode('utf-16-le')[::2]
    return GetUserName
GetUserName = GetUserName()


CPUID0_INSNS = create_string_buffer("\x53\x31\xc0\x0f\xa2\x8b\x44\x24\x08\x89"
                                    "\x18\x89\x50\x04\x89\x48\x08\x5b\xc3")
def cpuid0():
    buffer = create_string_buffer(12)
    cpuid0__ = CFUNCTYPE(c_char_p)(addressof(CPUID0_INSNS))
    def cpuid0():
        cpuid0__(buffer)
        return buffer.raw
    return cpuid0
cpuid0 = cpuid0()


CPUID1_INSNS = create_string_buffer("\x53\x31\xc0\x40\x0f\xa2\x5b\xc3")
cpuid1 = CFUNCTYPE(c_uint)(addressof(CPUID1_INSNS))


class DataBlob(Structure):
    _fields_ = [('cbData', c_uint),
                ('pbData', c_void_p)]
DataBlob_p = POINTER(DataBlob)

def CryptUnprotectData():
    _CryptUnprotectData = crypt32.CryptUnprotectData
    _CryptUnprotectData.argtypes = [DataBlob_p, c_wchar_p, DataBlob_p,
                                   c_void_p, c_void_p, c_uint, DataBlob_p]
    _CryptUnprotectData.restype = c_uint
    def CryptUnprotectData(indata, entropy):
        indatab = create_string_buffer(indata)
        indata = DataBlob(len(indata), cast(indatab, c_void_p))
        entropyb = create_string_buffer(entropy)
        entropy = DataBlob(len(entropy), cast(entropyb, c_void_p))
        outdata = DataBlob()
        if not _CryptUnprotectData(byref(indata), None, byref(entropy),
                                   None, None, 0, byref(outdata)):
            raise RuntimeError("Failed to decrypt user key key (sic)")
        return string_at(outdata.pbData, outdata.cbData)
    return CryptUnprotectData
CryptUnprotectData = CryptUnprotectData()


def retrieve_key(keypath):
    root = GetSystemDirectory().split('\\')[0] + '\\'
    serial = GetVolumeSerialNumber(root)
    vendor = cpuid0()
    signature = pack('>I', cpuid1())[1:]
    user = GetUserName()
    entropy = pack('>I12s3s13s', serial, vendor, signature, user)
    cuser = winreg.HKEY_CURRENT_USER
    regkey = winreg.OpenKey(cuser, DEVICE_KEY)
    device = winreg.QueryValueEx(regkey, 'key')[0]
    keykey = CryptUnprotectData(device, entropy)
    regkey = winreg.OpenKey(cuser, PRIVATE_LICENCE_KEY_KEY)
    userkey = winreg.QueryValueEx(regkey, 'value')[0]
    userkey = userkey.decode('base64')
    userkey = AES.new(keykey, AES.MODE_CBC).decrypt(userkey)
    userkey = userkey[26:-ord(userkey[-1])]
    with open(keypath, 'wb') as f:
        f.write(userkey)
    return


def main(argv=sys.argv):
    root = Tkinter.Tk()
    root.withdraw()
    progname = os.path.basename(argv[0])
    if AES is None:
        tkMessageBox.showerror(
            "ADEPT Key",
            "This script requires PyCrypto, which must be installed "
            "separately.  Read the top-of-script comment for details.")
        return 1
    keypath = 'adeptkey.der'
    try:
        retrieve_key(keypath)
    except Exception, e:
        tkMessageBox.showerror("ADEPT Key", "Error: " + str(e))
        return 1
    tkMessageBox.showinfo(
        "ADEPT Key", "Key successfully retrieved to %s" % (keypath))
    return 0

if __name__ == '__main__':
    sys.exit(main())