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22 lines
830 B
22 lines
830 B
# Copyright (c) 2010-2022 openpyxl
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def hash_password(plaintext_password=''):
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"""
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Create a password hash from a given string for protecting a worksheet
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only. This will not work for encrypting a workbook.
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This method is based on the algorithm provided by
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Daniel Rentz of OpenOffice and the PEAR package
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Spreadsheet_Excel_Writer by Xavier Noguer <xnoguer@rezebra.com>.
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See also http://blogs.msdn.com/b/ericwhite/archive/2008/02/23/the-legacy-hashing-algorithm-in-open-xml.aspx
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"""
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password = 0x0000
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for idx, char in enumerate(plaintext_password, 1):
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value = ord(char) << idx
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rotated_bits = value >> 15
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value &= 0x7fff
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password ^= (value | rotated_bits)
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password ^= len(plaintext_password)
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password ^= 0xCE4B
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return str(hex(password)).upper()[2:]
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