vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Shared/PasswordHasher.php

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<?php

namespace PhpOffice\PhpSpreadsheet\Shared;

use PhpOffice\PhpSpreadsheet\Exception;
use PhpOffice\PhpSpreadsheet\Worksheet\Protection;

class PasswordHasher
{
    /**
     * Get algorithm name for PHP.
     */
    private static function getAlgorithm(string $algorithmName): string
    {
        if (!$algorithmName) {
            return '';
        }

        // Mapping between algorithm name in Excel and algorithm name in PHP
        $mapping = [
            Protection::ALGORITHM_MD2 => 'md2',
            Protection::ALGORITHM_MD4 => 'md4',
            Protection::ALGORITHM_MD5 => 'md5',
            Protection::ALGORITHM_SHA_1 => 'sha1',
            Protection::ALGORITHM_SHA_256 => 'sha256',
            Protection::ALGORITHM_SHA_384 => 'sha384',
            Protection::ALGORITHM_SHA_512 => 'sha512',
            Protection::ALGORITHM_RIPEMD_128 => 'ripemd128',
            Protection::ALGORITHM_RIPEMD_160 => 'ripemd160',
            Protection::ALGORITHM_WHIRLPOOL => 'whirlpool',
        ];

        if (array_key_exists($algorithmName, $mapping)) {
            return $mapping[$algorithmName];
        }

        throw new Exception('Unsupported password algorithm: ' . $algorithmName);
    }

    /**
     * Create a password hash from a given string.
     *
     * 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>.
     *
     * @param string $pPassword Password to hash
     */
    private static function defaultHashPassword(string $pPassword): string
    {
        $password = 0x0000;
        $charPos = 1; // char position

        // split the plain text password in its component characters
        $chars = preg_split('//', $pPassword, -1, PREG_SPLIT_NO_EMPTY);
        foreach ($chars as $char) {
            $value = ord($char) << $charPos++; // shifted ASCII value
            $rotated_bits = $value >> 15; // rotated bits beyond bit 15
            $value &= 0x7fff; // first 15 bits
            $password ^= ($value | $rotated_bits);