<?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);