# Source code for openpyxl.utils.protection

    # Copyright (c) 2010-2024 openpyxl

    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:]