101 lines
3.4 KiB
PHP
101 lines
3.4 KiB
PHP
<?php
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namespace PhpOffice\PhpSpreadsheet\Shared;
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use PhpOffice\PhpSpreadsheet\Exception;
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use PhpOffice\PhpSpreadsheet\Worksheet\Protection;
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class PasswordHasher
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{
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/**
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* Get algorithm name for PHP.
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*/
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private static function getAlgorithm(string $algorithmName): string
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{
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if (!$algorithmName) {
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return '';
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}
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// Mapping between algorithm name in Excel and algorithm name in PHP
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$mapping = [
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Protection::ALGORITHM_MD2 => 'md2',
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Protection::ALGORITHM_MD4 => 'md4',
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Protection::ALGORITHM_MD5 => 'md5',
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Protection::ALGORITHM_SHA_1 => 'sha1',
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Protection::ALGORITHM_SHA_256 => 'sha256',
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Protection::ALGORITHM_SHA_384 => 'sha384',
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Protection::ALGORITHM_SHA_512 => 'sha512',
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Protection::ALGORITHM_RIPEMD_128 => 'ripemd128',
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Protection::ALGORITHM_RIPEMD_160 => 'ripemd160',
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Protection::ALGORITHM_WHIRLPOOL => 'whirlpool',
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];
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if (array_key_exists($algorithmName, $mapping)) {
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return $mapping[$algorithmName];
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}
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throw new Exception('Unsupported password algorithm: ' . $algorithmName);
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}
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/**
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* Create a password hash from a given string.
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*
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* This method is based on the algorithm provided by
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* Daniel Rentz of OpenOffice and the PEAR package
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* Spreadsheet_Excel_Writer by Xavier Noguer <xnoguer@rezebra.com>.
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*
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* @param string $pPassword Password to hash
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*/
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private static function defaultHashPassword(string $pPassword): string
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{
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$password = 0x0000;
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$charPos = 1; // char position
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// split the plain text password in its component characters
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$chars = preg_split('//', $pPassword, -1, PREG_SPLIT_NO_EMPTY);
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foreach ($chars as $char) {
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$value = ord($char) << $charPos++; // shifted ASCII value
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$rotated_bits = $value >> 15; // rotated bits beyond bit 15
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$value &= 0x7fff; // first 15 bits
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$password ^= ($value | $rotated_bits);
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}
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$password ^= strlen($pPassword);
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$password ^= 0xCE4B;
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return strtoupper(dechex($password));
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}
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/**
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* Create a password hash from a given string by a specific algorithm.
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*
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* 2.4.2.4 ISO Write Protection Method
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*
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* @see https://docs.microsoft.com/en-us/openspecs/office_file_formats/ms-offcrypto/1357ea58-646e-4483-92ef-95d718079d6f
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*
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* @param string $password Password to hash
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* @param string $algorithm Hash algorithm used to compute the password hash value
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* @param string $salt Pseudorandom string
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* @param int $spinCount Number of times to iterate on a hash of a password
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*
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* @return string Hashed password
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*/
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public static function hashPassword(string $password, string $algorithm = '', string $salt = '', int $spinCount = 10000): string
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{
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$phpAlgorithm = self::getAlgorithm($algorithm);
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if (!$phpAlgorithm) {
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return self::defaultHashPassword($password);
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}
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$saltValue = base64_decode($salt);
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$encodedPassword = mb_convert_encoding($password, 'UCS-2LE', 'UTF-8');
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$hashValue = hash($phpAlgorithm, $saltValue . $encodedPassword, true);
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for ($i = 0; $i < $spinCount; ++$i) {
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$hashValue = hash($phpAlgorithm, $hashValue . pack('L', $i), true);
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}
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return base64_encode($hashValue);
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}
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}
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