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Try to fix V3 PDF files

This commit is contained in:
NoDRM 2022-03-18 17:26:17 +01:00
parent 93ff0aac20
commit 227bda1ea6
2 changed files with 2 additions and 1 deletions
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1
CHANGELOG.md
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@ -61,3 +61,4 @@ List of changes since the fork of Apprentice Harper's repository:
- Add support for books with the new ADE3.0+ DRM by merging #48 by a980e066a01. Thanks a lot! - Add support for books with the new ADE3.0+ DRM by merging #48 by a980e066a01. Thanks a lot!
- Remove OpenSSL support, now the plugin will always use the Python crypto libraries. - Remove OpenSSL support, now the plugin will always use the Python crypto libraries.
- Obok: Fix issues with invalid UTF-8 characters by merging #26 by baby-bell. - Obok: Fix issues with invalid UTF-8 characters by merging #26 by baby-bell.
- Try to fix PDF files with V3 key obfuscation algorithm.

2
DeDRM_plugin/ineptpdf.py
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@ -1720,7 +1720,7 @@ class PDFDocument(object):
objid = struct.pack('<L', objid ^ 0x3569ac) objid = struct.pack('<L', objid ^ 0x3569ac)
genno = struct.pack('<L', genno ^ 0xca96) genno = struct.pack('<L', genno ^ 0xca96)
key = self.decrypt_key key = self.decrypt_key
key += objid[0] + genno[0] + objid[1] + genno[1] + objid[2] + b'sAlT' key += bytes([objid[0], genno[0], objid[1], genno[1], objid[2]]) + b'sAlT'
hash = hashlib.md5(key) hash = hashlib.md5(key)
key = hash.digest()[:min(len(self.decrypt_key) + 5, 16)] key = hash.digest()[:min(len(self.decrypt_key) + 5, 16)]
return key return key