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1# Copyright (c) 2010-2024 openpyxl
4def hash_password(plaintext_password=''):
5 """
6 Create a password hash from a given string for protecting a worksheet
7 only. This will not work for encrypting a workbook.
9 This method is based on the algorithm provided by
10 Daniel Rentz of OpenOffice and the PEAR package
11 Spreadsheet_Excel_Writer by Xavier Noguer <xnoguer@rezebra.com>.
12 See also http://blogs.msdn.com/b/ericwhite/archive/2008/02/23/the-legacy-hashing-algorithm-in-open-xml.aspx
13 """
14 password = 0x0000
15 for idx, char in enumerate(plaintext_password, 1):
16 value = ord(char) << idx
17 rotated_bits = value >> 15
18 value &= 0x7fff
19 password ^= (value | rotated_bits)
20 password ^= len(plaintext_password)
21 password ^= 0xCE4B
22 return str(hex(password)).upper()[2:]