Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.8/site-packages/openpyxl/utils/protection.py: 10%

1# Copyright (c) 2010-2023 openpyxl 

2 

3 

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. 

8 

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:]