2019-07-25 19:43:46 +03:00
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// Copyright 2017 FoxyUtils ehf. All rights reserved.
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2017-09-20 11:27:19 -04:00
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//
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// Use of this source code is governed by the terms of the Affero GNU General
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// Public License version 3.0 as published by the Free Software Foundation and
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// appearing in the file LICENSE included in the packaging of this file. A
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Functions2 (#348)
* MATCH, IFS, MAXA, MINA
* OFFSET fixed
* ISBLANK, ISERR, ISERROR, ISEVEN ,ISFORMULA, ISNONTEXT, ISNUMBER, ISODD, ISTEXT
* ISLEAPYEAR, ISLOGICAL, ISNA, ISREF
* FIND, FINDB
* SEARCH, SEARCHB
* CONCAT, CONCATENATE
* YEAR, YEARFRAC
* CONCAT is fixed, now TRUE and FALSE are concatenated instead of 1 and 0 in case of boolean results
* NOW, TODAY, TIME, TIMEVALUE
* DATE
* DATEDIF
2019-11-21 02:21:00 +03:00
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// commercial license can be purchased on https://unidoc.io.
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2017-09-20 11:27:19 -04:00
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package spreadsheet
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import (
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"fmt"
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)
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// PasswordHash returns the password hash for a workbook using the modified
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// spreadsheetML password hash that is compatible with Excel.
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func PasswordHash(s string) string {
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hash := uint16(0)
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if len(s) > 0 {
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for i := len(s) - 1; i >= 0; i-- {
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c := s[i]
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hash = ((hash >> 14) & 0x01) | ((hash << 1) & 0x7fff)
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hash ^= uint16(c)
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}
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hash = ((hash >> 14) & 0x01) | ((hash << 1) & 0x7fff)
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hash ^= uint16(len(s))
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hash ^= (0x8000 | ('N' << 8) | 'K')
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}
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return fmt.Sprintf("%04X", uint64(hash))
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}
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