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<?php |
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namespace PhpZip\IO\Filter\Cipher\Pkware; |
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use PhpZip\Exception\RuntimeException; |
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use PhpZip\Model\ZipEntry; |
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/** |
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* Encryption PKWARE Traditional Encryption. |
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*/ |
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class PKEncryptionStreamFilter extends \php_user_filter |
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{ |
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const FILTER_NAME = 'phpzip.encryption.pkware'; |
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/** @var int */ |
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private $size; |
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/** @var string */ |
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private $headerBytes; |
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/** @var int */ |
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private $writeLength; |
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/** @var bool */ |
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private $writeHeader; |
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/** @var PKCryptContext */ |
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private $context; |
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/** |
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* @return bool |
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*/ |
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public static function register() |
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{ |
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return stream_filter_register(self::FILTER_NAME, __CLASS__); |
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} |
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/** |
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* @see https://php.net/manual/en/php-user-filter.oncreate.php |
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* |
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* @return bool |
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*/ |
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public function onCreate() |
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{ |
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if (\PHP_INT_SIZE === 4) { |
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throw new RuntimeException('Traditional PKWARE Encryption is not supported in 32-bit PHP.'); |
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} |
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if (!isset($this->params['entry'], $this->params['size'])) { |
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return false; |
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} |
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if (!($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 = (int) $this->params['size']; |
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// init keys |
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$this->context = new PKCryptContext($password); |
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$crc = $entry->isDataDescriptorRequired() || $entry->getCrc() === ZipEntry::UNKNOWN ? |
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($entry->getDosTime() & 0x0000ffff) << 16 : |
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$entry->getCrc(); |
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try { |
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$headerBytes = random_bytes(PKCryptContext::STD_DEC_HDR_SIZE); |
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} catch (\Exception $e) { |
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throw new \RuntimeException('Oops, our server is bust and cannot generate any random data.', 1, $e); |
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} |
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$headerBytes[PKCryptContext::STD_DEC_HDR_SIZE - 1] = pack('c', ($crc >> 24) & 0xff); |
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$headerBytes[PKCryptContext::STD_DEC_HDR_SIZE - 2] = pack('c', ($crc >> 16) & 0xff); |
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$this->headerBytes = $headerBytes; |
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$this->writeLength = 0; |
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$this->writeHeader = false; |
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return true; |
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} |
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/** |
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* Encryption 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 $closing |
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* |
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* @return int |
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* |
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* @todo USE FFI in php 7.4 |
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*/ |
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public function filter($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->writeLength += $bucket->datalen; |
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if ($this->writeLength > $this->size) { |
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$buffer = substr($buffer, 0, $this->size - $this->writeLength); |
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} |
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$data = ''; |
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if (!$this->writeHeader) { |
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$data .= $this->context->encryptString($this->headerBytes); |
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$this->writeHeader = true; |
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} |
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$data .= $this->context->encryptString($buffer); |
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$bucket->data = $data; |
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$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
