/**
* Decrypts the encrypted settings and returns the plaintext INI string
*
* @param $encrypted string The encrypted data
*
* @return string The decrypted data
*/
public static function decryptSettings($encrypted, $key = null)
{
if (substr($encrypted, 0, 12) == '###AES128###') {
$mode = 'AES128';
} elseif (substr($encrypted, 0, 12) == '###CTR128###') {
$mode = 'CTR128';
} else {
return $encrypted;
}
if (empty($key)) {
$key = self::getKey();
}
$encrypted = substr($encrypted, 12);
switch ($mode) {
case 'AES128':
$encrypted = base64_decode($encrypted);
$decrypted = AEUtilEncrypt::AESDecryptCBC($encrypted, $key, 128);
break;
case 'CTR128':
$decrypted = AEUtilEncrypt::AESDecryptCtr($encrypted, $key, 128);
break;
}
return $decrypted;
}
/**
* Writes an encrypted block to the archive
* @param resource $fp The file pointer resource of the file to write to
* @param string $data Raw binary data to encrypt and write
*/
private function _writeEncryptedBlock(&$fp, $data)
{
$decryptedSize = akstringlen($data);
$data = AEUtilEncrypt::AESEncryptCBC($data, $this->password, 128);
$encryptedSize = akstringlen($data);
// Do we have enough space to store the 8 byte header?
if ($this->_useSplitZIP) {
// Compare to free part space
clearstatcache();
$current_part_size = @filesize($this->_dataFileName);
$free_space = $this->_fragmentSize - ($current_part_size === false ? 0 : $current_part_size);
if ($free_space <= 8) {
@fclose($fp);
// Not enough space on current part, create new part
if (!$this->_createNewPart()) {
$this->setError('Could not create new JPS part file ' . basename($this->_dataFileName));
return false;
}
// Open data file for output
$fp = @fopen($this->_dataFileName, "ab");
if ($fp === false) {
$this->setError("Could not open archive file '{$this->_dataFileName}' for append!");
return;
}
}
} else {
$free_space = $encryptedSize + 8;
}
// Write the header
$this->_fwrite($fp, pack('V', $encryptedSize) . pack('V', $decryptedSize));
if ($this->getError()) {
return;
}
$free_space -= 8;
// Do we have enough space to write the data in one part?
if ($free_space >= $encryptedSize) {
$this->_fwrite($fp, $data);
if ($this->getError()) {
return;
}
} else {
// Split between parts - Write first part
$firstPart = substr($data, 0, $free_space);
$secondPart = substr($data, $free_space);
if (md5($firstPart . $secondPart) != md5($data)) {
die('DEBUG -- Multibyte character problems!');
die;
}
$this->_fwrite($fp, $firstPart, $free_space);
if ($this->getError()) {
@fclose($fp);
return;
}
// Create new part
if (!$this->_createNewPart()) {
// Die if we couldn't create the new part
$this->setError('Could not create new JPA part file ' . basename($this->_dataFileName));
@fclose($fp);
return false;
} else {
// Close the old data file
@fclose($fp);
// Open data file for output
$fp = @fopen($this->_dataFileName, "ab");
if ($fp === false) {
$this->setError("Could not open archive file {$this->_dataFileName} for append!");
return false;
}
}
// Write the rest of the data
$this->_fwrite($fp, $secondPart, $encryptedSize - $free_space);
}
}
/**
* Packages the response to a JSON-encoded object, optionally encrypting the
* data part with a caller-supplied password.
* @return string The JSON-encoded response
*/
private function getResponse()
{
// Initialize the response
$response = array('encapsulation' => $this->encapsulation, 'body' => array('status' => $this->status, 'data' => null));
switch ($this->method_name) {
case 'Download':
$data = json_encode($this->data);
break;
default:
$data = $this->json_encode($this->data);
break;
}
if (empty($this->password)) {
$this->encapsulation = self::ENCAPSULATION_RAW;
}
switch ($this->encapsulation) {
case self::ENCAPSULATION_RAW:
break;
case self::ENCAPSULATION_AESCTR128:
$data = AEUtilEncrypt::AESEncryptCtr($data, $this->password, 128);
break;
case self::ENCAPSULATION_AESCTR256:
$data = AEUtilEncrypt::AESEncryptCtr($data, $this->password, 256);
break;
case self::ENCAPSULATION_AESCBC128:
$data = base64_encode(AEUtilEncrypt::AESEncryptCBC($data, $this->password, 128));
break;
case self::ENCAPSULATION_AESCBC256:
$data = base64_encode(AEUtilEncrypt::AESEncryptCBC($data, $this->password, 256));
break;
}
$response['body']['data'] = $data;
switch ($this->method_name) {
case 'Download':
return '###' . json_encode($response) . '###';
break;
default:
return '###' . $this->json_encode($response) . '###';
break;
}
}
