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<?php |
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namespace PhpZip\IO\Filter\Cipher\Pkware; |
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use PhpZip\Exception\ZipException; |
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use PhpZip\Model\ZipEntry; |
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/** |
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* Decryption PKWARE Traditional Encryption. |
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*/ |
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class PKDecryptionStreamFilter extends \php_user_filter |
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{ |
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const FILTER_NAME = 'phpzip.decryption.pkware'; |
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/** @var int */ |
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private $checkByte = 0; |
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/** @var int */ |
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private $readLength = 0; |
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/** @var int */ |
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private $size = 0; |
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/** @var bool */ |
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private $readHeader = false; |
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/** @var PKCryptContext */ |
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private $context; |
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/** |
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* @return bool |
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*/ |
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public static function register() |
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{ |
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return stream_filter_register(self::FILTER_NAME, __CLASS__); |
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} |
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/** |
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* @see https://php.net/manual/en/php-user-filter.oncreate.php |
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* |
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* @return bool |
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*/ |
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public function onCreate() |
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{ |
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if (!isset($this->params['entry'])) { |
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return false; |
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} |
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if (!($this->params['entry'] instanceof ZipEntry)) { |
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throw new \RuntimeException('ZipEntry expected'); |
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} |
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/** @var ZipEntry $entry */ |
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$entry = $this->params['entry']; |
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$password = $entry->getPassword(); |
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if ($password === null) { |
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return false; |
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} |
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$this->size = $entry->getCompressedSize(); |
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// init context |
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$this->context = new PKCryptContext($password); |
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// init check byte |
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if ($entry->isDataDescriptorEnabled()) { |
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$this->checkByte = ($entry->getDosTime() >> 8) & 0xff; |
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} else { |
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$this->checkByte = ($entry->getCrc() >> 24) & 0xff; |
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} |
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$this->readLength = 0; |
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$this->readHeader = false; |
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return true; |
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} |
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/** |
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* Decryption filter. |
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* |
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* @param resource $in |
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* @param resource $out |
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* @param int $consumed |
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* @param bool $closing |
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* |
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* @throws ZipException |
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* |
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* @return int |
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* |
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* @todo USE FFI in php 7.4 |
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*/ |
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public function filter($in, $out, &$consumed, $closing) |
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{ |
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while ($bucket = stream_bucket_make_writeable($in)) { |
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$buffer = $bucket->data; |
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$this->readLength += $bucket->datalen; |
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if ($this->readLength > $this->size) { |
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$buffer = substr($buffer, 0, $this->size - $this->readLength); |
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} |
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if (!$this->readHeader) { |
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$header = substr($buffer, 0, PKCryptContext::STD_DEC_HDR_SIZE); |
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$this->context->checkHeader($header, $this->checkByte); |
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$buffer = substr($buffer, PKCryptContext::STD_DEC_HDR_SIZE); |
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$this->readHeader = true; |
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} |
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$bucket->data = $this->context->decryptString($buffer); |
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$consumed += $bucket->datalen; |
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stream_bucket_append($out, $bucket); |
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} |
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return \PSFS_PASS_ON; |
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} |
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} |
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Ne-Lexa /
php-zip
