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125 lines
4.0 KiB
Python
125 lines
4.0 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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# Engine to remove drm from Kindle KFX ebooks
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# 2.0 - Python 3 for calibre 5.0
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# 2.1 - Some fixes for debugging
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# 2.1.1 - Whitespace!
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import os, sys
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import shutil
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import traceback
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import zipfile
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from io import BytesIO
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#@@CALIBRE_COMPAT_CODE@@
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from ion import DrmIon, DrmIonVoucher
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__license__ = 'GPL v3'
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__version__ = '2.0'
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class KFXZipBook:
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def __init__(self, infile):
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self.infile = infile
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self.voucher = None
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self.decrypted = {}
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def getPIDMetaInfo(self):
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return (None, None)
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def processBook(self, totalpids):
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with zipfile.ZipFile(self.infile, 'r') as zf:
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for filename in zf.namelist():
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with zf.open(filename) as fh:
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data = fh.read(8)
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if data != b'\xeaDRMION\xee':
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continue
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data += fh.read()
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if self.voucher is None:
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self.decrypt_voucher(totalpids)
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print("Decrypting KFX DRMION: {0}".format(filename))
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outfile = BytesIO()
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DrmIon(BytesIO(data[8:-8]), lambda name: self.voucher).parse(outfile)
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self.decrypted[filename] = outfile.getvalue()
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if not self.decrypted:
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print("The .kfx-zip archive does not contain an encrypted DRMION file")
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def decrypt_voucher(self, totalpids):
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with zipfile.ZipFile(self.infile, 'r') as zf:
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for info in zf.infolist():
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with zf.open(info.filename) as fh:
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data = fh.read(4)
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if data != b'\xe0\x01\x00\xea':
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continue
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data += fh.read()
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if b'ProtectedData' in data:
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break # found DRM voucher
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else:
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raise Exception("The .kfx-zip archive contains an encrypted DRMION file without a DRM voucher")
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print("Decrypting KFX DRM voucher: {0}".format(info.filename))
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for pid in [''] + totalpids:
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# Belt and braces. PIDs should be unicode strings, but just in case...
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if isinstance(pid, bytes):
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pid = pid.decode('ascii')
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for dsn_len,secret_len in [(0,0), (16,0), (16,40), (32,0), (32,40), (40,0), (40,40)]:
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if len(pid) == dsn_len + secret_len:
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break # split pid into DSN and account secret
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else:
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continue
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try:
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voucher = DrmIonVoucher(BytesIO(data), pid[:dsn_len], pid[dsn_len:])
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voucher.parse()
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voucher.decryptvoucher()
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break
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except:
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traceback.print_exc()
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pass
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else:
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raise Exception("Failed to decrypt KFX DRM voucher with any key")
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print("KFX DRM voucher successfully decrypted")
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license_type = voucher.getlicensetype()
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if license_type != "Purchase":
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#raise Exception(("This book is licensed as {0}. "
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# 'These tools are intended for use on purchased books.').format(license_type))
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print("Warning: This book is licensed as {0}. "
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"These tools are intended for use on purchased books. Continuing ...".format(license_type))
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self.voucher = voucher
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def getBookTitle(self):
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return os.path.splitext(os.path.split(self.infile)[1])[0]
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def getBookExtension(self):
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return '.kfx-zip'
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def getBookType(self):
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return 'KFX-ZIP'
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def cleanup(self):
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pass
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def getFile(self, outpath):
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if not self.decrypted:
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shutil.copyfile(self.infile, outpath)
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else:
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with zipfile.ZipFile(self.infile, 'r') as zif:
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with zipfile.ZipFile(outpath, 'w') as zof:
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for info in zif.infolist():
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zof.writestr(info, self.decrypted.get(info.filename, zif.read(info.filename)))
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