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<?php |
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namespace PhpZip\IO\Filter\Cipher\WinZipAes; |
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use PhpZip\Exception\RuntimeException; |
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use PhpZip\Exception\ZipAuthenticationException; |
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use PhpZip\Model\Extra\Fields\WinZipAesExtraField; |
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use PhpZip\Model\ZipEntry; |
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/** |
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* Decrypt WinZip AES stream. |
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*/ |
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class WinZipAesDecryptionStreamFilter extends \php_user_filter |
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{ |
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const FILTER_NAME = 'phpzip.decryption.winzipaes'; |
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/** @var string */ |
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private $buffer; |
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/** @var string */ |
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private $authenticationCode; |
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/** @var int */ |
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private $encBlockPosition = 0; |
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/** @var int */ |
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private $encBlockLength = 0; |
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/** @var int */ |
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private $readLength = 0; |
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/** @var ZipEntry */ |
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private $entry; |
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/** @var WinZipAesContext|null */ |
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private $context; |
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/** |
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* @return bool |
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*/ |
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public static function register() |
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{ |
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return stream_filter_register(self::FILTER_NAME, __CLASS__); |
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} |
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/** |
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* @return bool |
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* |
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* @noinspection DuplicatedCode |
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*/ |
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public function onCreate() |
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{ |
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if (!isset($this->params['entry'])) { |
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return false; |
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} |
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if (!($this->params['entry'] instanceof ZipEntry)) { |
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throw new \RuntimeException('ZipEntry expected'); |
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} |
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$this->entry = $this->params['entry']; |
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if ( |
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$this->entry->getPassword() === null || |
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!$this->entry->isEncrypted() || |
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!$this->entry->hasExtraField(WinZipAesExtraField::HEADER_ID) |
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) { |
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return false; |
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} |
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$this->buffer = ''; |
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return true; |
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} |
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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 $closing |
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* |
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* @throws ZipAuthenticationException |
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* |
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* @return int |
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*/ |
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public function filter($in, $out, &$consumed, $closing) |
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{ |
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while ($bucket = stream_bucket_make_writeable($in)) { |
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$this->buffer .= $bucket->data; |
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$this->readLength += $bucket->datalen; |
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if ($this->readLength > $this->entry->getCompressedSize()) { |
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$this->buffer = substr($this->buffer, 0, $this->entry->getCompressedSize() - $this->readLength); |
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} |
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// read header |
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if ($this->context === null) { |
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/** |
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* @var WinZipAesExtraField|null $winZipExtra |
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*/ |
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$winZipExtra = $this->entry->getExtraField(WinZipAesExtraField::HEADER_ID); |
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if ($winZipExtra === null) { |
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throw new RuntimeException('$winZipExtra is null'); |
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} |
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$saltSize = $winZipExtra->getSaltSize(); |
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$headerSize = $saltSize + WinZipAesContext::PASSWORD_VERIFIER_SIZE; |
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if (\strlen($this->buffer) < $headerSize) { |
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return \PSFS_FEED_ME; |
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} |
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$salt = substr($this->buffer, 0, $saltSize); |
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$passwordVerifier = substr($this->buffer, $saltSize, WinZipAesContext::PASSWORD_VERIFIER_SIZE); |
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$password = $this->entry->getPassword(); |
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if ($password === null) { |
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throw new RuntimeException('$password is null'); |
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} |
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$this->context = new WinZipAesContext($winZipExtra->getEncryptionStrength(), $password, $salt); |
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unset($password); |
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// Verify password. |
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if ($passwordVerifier !== $this->context->getPasswordVerifier()) { |
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throw new ZipAuthenticationException('Invalid password'); |
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} |
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$this->encBlockPosition = 0; |
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$this->encBlockLength = $this->entry->getCompressedSize() - $headerSize - WinZipAesContext::FOOTER_SIZE; |
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$this->buffer = substr($this->buffer, $headerSize); |
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} |
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// encrypt data |
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$plainText = ''; |
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$offset = 0; |
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$len = \strlen($this->buffer); |
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$remaining = $this->encBlockLength - $this->encBlockPosition; |
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if ($remaining >= WinZipAesContext::BLOCK_SIZE && $len < WinZipAesContext::BLOCK_SIZE) { |
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return \PSFS_FEED_ME; |
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} |
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$limit = min($len, $remaining); |
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if ($remaining > $limit && ($limit % WinZipAesContext::BLOCK_SIZE) !== 0) { |
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$limit -= ($limit % WinZipAesContext::BLOCK_SIZE); |
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} |
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while ($offset < $limit) { |
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$this->context->updateIv(); |
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$length = min(WinZipAesContext::BLOCK_SIZE, $limit - $offset); |
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$data = substr($this->buffer, 0, $length); |
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$plainText .= $this->context->decryption($data); |
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$offset += $length; |
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$this->buffer = substr($this->buffer, $length); |
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} |
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$this->encBlockPosition += $offset; |
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if ( |
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$this->encBlockPosition === $this->encBlockLength && |
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\strlen($this->buffer) === WinZipAesContext::FOOTER_SIZE |
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) { |
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$this->authenticationCode = $this->buffer; |
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$this->buffer = ''; |
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} |
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$bucket->data = $plainText; |
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$consumed += $bucket->datalen; |
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stream_bucket_append($out, $bucket); |
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} |
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return \PSFS_PASS_ON; |
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} |
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/** |
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* @see http://php.net/manual/en/php-user-filter.onclose.php |
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* |
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* @throws ZipAuthenticationException |
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*/ |
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public function onClose() |
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{ |
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$this->buffer = ''; |
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if ($this->context !== null) { |
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$this->context->checkAuthCode($this->authenticationCode); |
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} |
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} |
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} |
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Ne-Lexa /
php-zip
