<?php

namespace PhpOffice\PhpSpreadsheet\Shared;


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


    /**

>     const MAX_PASSWORD_LENGTH = 255;
     * Create a password hash from a given string.
> 
     *
>     /**
     * This method is based on the algorithm provided by
>      * Get algorithm name for PHP.
     * Daniel Rentz of OpenOffice and the PEAR package
>      */
     * Spreadsheet_Excel_Writer by Xavier Noguer <xnoguer@rezebra.com>.
>     private static function getAlgorithm(string $algorithmName): string
     *
>     {
     * @param string $pPassword Password to hash
>         if (!$algorithmName) {
     *
>             return '';
     * @return string Hashed password
>         }
     */
> 
    public static function hashPassword($pPassword)
>         // Mapping between algorithm name in Excel and algorithm name in PHP
    {
>         $mapping = [
        $password = 0x0000;
>             Protection::ALGORITHM_MD2 => 'md2',
        $charPos = 1; // char position
>             Protection::ALGORITHM_MD4 => 'md4',

>             Protection::ALGORITHM_MD5 => 'md5',
        // split the plain text password in its component characters
>             Protection::ALGORITHM_SHA_1 => 'sha1',
        $chars = preg_split('//', $pPassword, -1, PREG_SPLIT_NO_EMPTY);
>             Protection::ALGORITHM_SHA_256 => 'sha256',
        foreach ($chars as $char) {
>             Protection::ALGORITHM_SHA_384 => 'sha384',
            $value = ord($char) << $charPos++; // shifted ASCII value
>             Protection::ALGORITHM_SHA_512 => 'sha512',
            $rotated_bits = $value >> 15; // rotated bits beyond bit 15
>             Protection::ALGORITHM_RIPEMD_128 => 'ripemd128',
            $value &= 0x7fff; // first 15 bits
>             Protection::ALGORITHM_RIPEMD_160 => 'ripemd160',
            $password ^= ($value | $rotated_bits);
>             Protection::ALGORITHM_WHIRLPOOL => 'whirlpool',
        }
>         ];

> 
        $password ^= strlen($pPassword);
>         if (array_key_exists($algorithmName, $mapping)) {
        $password ^= 0xCE4B;
>             return $mapping[$algorithmName];

>         }
        return strtoupper(dechex($password));
> 
    }
>         throw new SpException('Unsupported password algorithm: ' . $algorithmName);
}
>     }
> 



<      * This method is based on the algorithm provided by



>      * This method is based on the spec at:
>      * https://interoperability.blob.core.windows.net/files/MS-OFFCRYPTO/[MS-OFFCRYPTO].pdf
>      * 2.3.7.1 Binary Document Password Verifier Derivation Method 1
>      *
>      * It replaces a method based on the algorithm provided by



<      * @param string $pPassword Password to hash



>      * Scrutinizer will squawk at the use of bitwise operations here,
>      * but it should ultimately pass.



<      * @return string Hashed password



>      * @param string $password Password to hash



<     public static function hashPassword($pPassword)



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



<         $password = 0x0000;
<         $charPos = 1; // char position



>         $verifier = 0;
>         $pwlen = strlen($password);
>         $passwordArray = pack('c', $pwlen) . $password;
>         for ($i = $pwlen; $i >= 0; --$i) {
>             $intermediate1 = (($verifier & 0x4000) === 0) ? 0 : 1;
>             $intermediate2 = 2 * $verifier;
>             $intermediate2 = $intermediate2 & 0x7fff;
>             $intermediate3 = $intermediate1 | $intermediate2;
>             $verifier = $intermediate3 ^ ord($passwordArray[$i]);
>         }
>         $verifier ^= 0xCE4B;
> 
>         return strtoupper(dechex($verifier));
>     }



<         // 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);



>     /**
>      * 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 $spinCount = 10000): string
>     {
>         if (strlen($password) > self::MAX_PASSWORD_LENGTH) {
>             throw new SpException('Password exceeds ' . self::MAX_PASSWORD_LENGTH . ' characters');



>         $phpAlgorithm = self::getAlgorithm($algorithm);
>         if (!$phpAlgorithm) {
>             return self::defaultHashPassword($password);
>         }
> 
>         $saltValue = base64_decode($salt);
>         $encodedPassword = mb_convert_encoding($password, 'UCS-2LE', 'UTF-8');



<         $password ^= strlen($pPassword);
<         $password ^= 0xCE4B;



>         $hashValue = hash($phpAlgorithm, $saltValue . $encodedPassword, true);
>         for ($i = 0; $i < $spinCount; ++$i) {
>             $hashValue = hash($phpAlgorithm, $hashValue . pack('L', $i), true);
>         }



<         return strtoupper(dechex($password));



>         return base64_encode($hashValue);