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Fix 32-bit Problem in PasswordEncoder #2551

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merged 2 commits into from
Jan 23, 2024
Merged

Fix 32-bit Problem in PasswordEncoder #2551

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7e21348
Fix 32-bit Problem in PasswordEncoder
oleibman Jan 15, 2024
ab7a3ae
Update change log
oleibman Jan 23, 2024
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Fix 32-bit Problem in PasswordEncoder 
Fix #2550.
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@oleibman
oleibman committed Jan 15, 2024
commit 7e21348e06dfc771bd8be977f2a027b74e78396e
11 changes: 7 additions & 4 deletions src/PhpWord/Shared/Microsoft/PasswordEncoder.php
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,9 @@ class PasswordEncoder
const ALGORITHM_MAC = 'MAC';
const ALGORITHM_HMAC = 'HMAC';

private const ALL_ONE_BITS = (PHP_INT_SIZE > 4) ? 0xFFFFFFFF : -1;
private const HIGH_ORDER_BIT = (PHP_INT_SIZE > 4) ? 0x80000000 : PHP_INT_MIN;

/**
* Mapping between algorithm name and algorithm ID.
*
Expand Down Expand Up @@ -128,7 +131,7 @@ public static function hashPassword($password, $algorithmName = self::ALGORITHM_
// build low-order word and hig-order word and combine them
$combinedKey = self::buildCombinedKey($byteChars);
// build reversed hexadecimal string
$hex = str_pad(strtoupper(dechex($combinedKey & 0xFFFFFFFF)), 8, '0', \STR_PAD_LEFT);
$hex = str_pad(strtoupper(dechex($combinedKey & self::ALL_ONE_BITS)), 8, '0', \STR_PAD_LEFT);
$reversedHex = $hex[6] . $hex[7] . $hex[4] . $hex[5] . $hex[2] . $hex[3] . $hex[0] . $hex[1];

$generatedKey = mb_convert_encoding($reversedHex, 'UCS-2LE', 'UTF-8');
Expand Down Expand Up @@ -232,10 +235,10 @@ private static function buildCombinedKey($byteChars)
*/
private static function int32($value)
{
$value = ($value & 0xFFFFFFFF);
$value = $value & self::ALL_ONE_BITS;

if ($value & 0x80000000) {
$value = -((~$value & 0xFFFFFFFF) + 1);
if ($value & self::HIGH_ORDER_BIT) {
$value = -((~$value & self::ALL_ONE_BITS) + 1);
}

return $value;
Expand Down