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Fix for broken book keys

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This commit is contained in:
Aldo Bleeker
2021-01-28 13:06:59 +01:00
parent 8d2d6627cf
commit 33b9630ca5
2 changed files with 8 additions and 9 deletions
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9
DeDRM_plugin/ineptpdf.py
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@@ -1599,11 +1599,10 @@ class PDFDocument(object):
bookkey = rsa.decrypt(bookkey)
#if bookkey[0] != 2:
# raise ADEPTError('error decrypting book session key')
try:
index = bookkey.index(b'\0') + 1
bookkey = bookkey[index:]
except ValueError:
pass
if len(bookkey) > 16:
if bookkey[-17] == '\x00' or bookkey[-17] == 0:
bookkey = bookkey[-16:]
length = 16
ebx_V = int_value(param.get('V', 4))
ebx_type = int_value(param.get('EBX_ENCRYPTIONTYPE', 6))
# added because of improper booktype / decryption book session key errors