Source code for openpyxl.utils.protection

# Copyright (c) 2010-2019 openpyxl


[docs]def hash_password(plaintext_password=''): """ Create a password hash from a given string for protecting a worksheet only. This will not work for encrypting a workbook. This method is based on the algorithm provided by Daniel Rentz of OpenOffice and the PEAR package Spreadsheet_Excel_Writer by Xavier Noguer <xnoguer@rezebra.com>. See also http://blogs.msdn.com/b/ericwhite/archive/2008/02/23/the-legacy-hashing-algorithm-in-open-xml.aspx """ password = 0x0000 for idx, char in enumerate(plaintext_password, 1): value = ord(char) << idx rotated_bits = value >> 15 value &= 0x7fff password ^= (value | rotated_bits) password ^= len(plaintext_password) password ^= 0xCE4B return str(hex(password)).upper()[2:]