mirror of
https://github.com/noDRM/DeDRM_tools.git
synced 2024-09-12 19:36:09 +06:00
4400d8d1d4
We only need to read the magic bytes headers to identify files of the correct type. Avoid slurping the entire contents out of the zip if it's the wrong file.
116 lines
3.6 KiB
Python
116 lines
3.6 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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from __future__ import with_statement
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# Engine to remove drm from Kindle KFX ebooks
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import os
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import shutil
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import zipfile
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try:
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from cStringIO import StringIO
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except ImportError:
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from StringIO import StringIO
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try:
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import ion
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except:
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from calibre_plugins.dedrm import ion
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__license__ = 'GPL v3'
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__version__ = '1.0'
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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 != '\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 u'Decrypting KFX DRMION: {0}'.format(filename)
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outfile = StringIO()
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ion.DrmIon(StringIO(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(u'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 != '\xe0\x01\x00\xea':
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continue
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data += fh.read()
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if 'ProtectedData' in data:
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break # found DRM voucher
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else:
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raise Exception(u'The .kfx-zip archive contains an encrypted DRMION file without a DRM voucher')
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print u'Decrypting KFX DRM voucher: {0}'.format(info.filename)
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for pid in [''] + totalpids:
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for dsn_len,secret_len in [(0,0), (16,0), (16,40), (32,40), (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 = ion.DrmIonVoucher(StringIO(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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pass
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else:
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raise Exception(u'Failed to decrypt KFX DRM voucher with any key')
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print u'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((u'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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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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