<?php

namespace PhpOffice\PhpSpreadsheet\Shared;


> use PhpOffice\PhpSpreadsheet\Exception;
class PasswordHasher
> use PhpOffice\PhpSpreadsheet\Worksheet\Protection;
{
> 


    /**

>      * Get algorithm name for PHP.
     * Create a password hash from a given string.
>      */
     *
>     private static function getAlgorithm(string $algorithmName): string
     * This method is based on the algorithm provided by
>     {
     * Daniel Rentz of OpenOffice and the PEAR package
>         if (!$algorithmName) {
     * Spreadsheet_Excel_Writer by Xavier Noguer <xnoguer@rezebra.com>.
>             return '';
     *
>         }
     * @param string $pPassword Password to hash
> 
     *
>         // Mapping between algorithm name in Excel and algorithm name in PHP
     * @return string Hashed password
>         $mapping = [
     */
>             Protection::ALGORITHM_MD2 => 'md2',
    public static function hashPassword($pPassword)
>             Protection::ALGORITHM_MD4 => 'md4',
    {
>             Protection::ALGORITHM_MD5 => 'md5',
        $password = 0x0000;
>             Protection::ALGORITHM_SHA_1 => 'sha1',
        $charPos = 1; // char position
>             Protection::ALGORITHM_SHA_256 => 'sha256',

>             Protection::ALGORITHM_SHA_384 => 'sha384',
        // split the plain text password in its component characters
>             Protection::ALGORITHM_SHA_512 => 'sha512',
        $chars = preg_split('//', $pPassword, -1, PREG_SPLIT_NO_EMPTY);
>             Protection::ALGORITHM_RIPEMD_128 => 'ripemd128',
        foreach ($chars as $char) {
>             Protection::ALGORITHM_RIPEMD_160 => 'ripemd160',
            $value = ord($char) << $charPos++; // shifted ASCII value
>             Protection::ALGORITHM_WHIRLPOOL => 'whirlpool',
            $rotated_bits = $value >> 15; // rotated bits beyond bit 15
>         ];
            $value &= 0x7fff; // first 15 bits
> 
            $password ^= ($value | $rotated_bits);
>         if (array_key_exists($algorithmName, $mapping)) {
        }
>             return $mapping[$algorithmName];

>         }
        $password ^= strlen($pPassword);
> 
        $password ^= 0xCE4B;
>         throw new Exception('Unsupported password algorithm: ' . $algorithmName);

>     }
        return strtoupper(dechex($password));
> 
    }
>     /**



<      *
<      * @return string Hashed password



<     public static function hashPassword($pPassword)



>     private static function defaultHashPassword(string $pPassword): string



>     }
> 
>     /**
>      * Create a password hash from a given string by a specific algorithm.
>      *
>      * 2.4.2.4 ISO Write Protection Method
>      *
>      * @see https://docs.microsoft.com/en-us/openspecs/office_file_formats/ms-offcrypto/1357ea58-646e-4483-92ef-95d718079d6f
>      *
>      * @param string $password Password to hash
>      * @param string $algorithm Hash algorithm used to compute the password hash value
>      * @param string $salt Pseudorandom string
>      * @param int $spinCount Number of times to iterate on a hash of a password
>      *
>      * @return string Hashed password
>      */
>     public static function hashPassword(string $password, string $algorithm = '', string $salt = '', int $spinCount = 10000): string
>     {
>         $phpAlgorithm = self::getAlgorithm($algorithm);
>         if (!$phpAlgorithm) {
>             return self::defaultHashPassword($password);
>         }
> 
>         $saltValue = base64_decode($salt);
>         $encodedPassword = mb_convert_encoding($password, 'UCS-2LE', 'UTF-8');
> 
>         $hashValue = hash($phpAlgorithm, $saltValue . $encodedPassword, true);
>         for ($i = 0; $i < $spinCount; ++$i) {
>             $hashValue = hash($phpAlgorithm, $hashValue . pack('L', $i), true);
>         }
> 
>         return base64_encode($hashValue);