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Correct password verification for revision 3 or greater #12

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Correct password verification for revision 3 or greater #12

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5 changes: 3 additions & 2 deletions pyPdf/pdf.py
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Original file line number Diff line number Diff line change
Expand Up @@ -936,15 +936,16 @@ def _authenticateUserPassword(self, password):
p_entry = encrypt['/P'].getObject()
id_entry = self.trailer['/ID'].getObject()
id1_entry = id_entry[0].getObject()
real_U = encrypt['/U'].getObject().original_bytes
if rev == 2:
U, key = _alg34(password, owner_entry, p_entry, id1_entry)
return U == real_U, key
elif rev >= 3:
U, key = _alg35(password, rev,
encrypt["/Length"].getObject() / 8, owner_entry,
p_entry, id1_entry,
encrypt.get("/EncryptMetadata", BooleanObject(False)).getObject())
real_U = encrypt['/U'].getObject().original_bytes
return U == real_U, key
return U[:16] == real_U[:16], key

def getIsEncrypted(self):
return self.trailer.has_key("/Encrypt")
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