/**
* Defined by IfwPsn_Vendor_Zend_Filter_Interface
*
* Decrypts $value with the defined settings
*
* @param string $value Content to decrypt
* @return string The decrypted content
*/
public function decrypt($value)
{
$cipher = $this->_openCipher();
$this->_initCipher($cipher);
$decrypted = mdecrypt_generic($cipher, $value);
mcrypt_generic_deinit($cipher);
$this->_closeCipher($cipher);
// decompress after decryption
if (!empty($this->_compression)) {
require_once IFW_PSN_LIB_ROOT . 'IfwPsn/Vendor/Zend/Filter/Decompress.php';
$decompress = new IfwPsn_Vendor_Zend_Filter_Decompress($this->_compression);
$decrypted = $decompress->filter($decrypted);
}
return $decrypted;
}
/**
* Defined by IfwPsn_Vendor_Zend_Filter_Interface
*
* Decrypts $value with the defined settings
*
* @param string $value Content to decrypt
* @return string The decrypted content
* @throws IfwPsn_Vendor_Zend_Filter_Exception
*/
public function decrypt($value)
{
$decrypted = "";
$envelope = current($this->getEnvelopeKey());
if (count($this->_keys['private']) !== 1) {
require_once IFW_PSN_LIB_ROOT . 'IfwPsn/Vendor/Zend/Filter/Exception.php';
throw new IfwPsn_Vendor_Zend_Filter_Exception('Please give a private key for decryption with Openssl');
}
if (!$this->_package && empty($envelope)) {
require_once IFW_PSN_LIB_ROOT . 'IfwPsn/Vendor/Zend/Filter/Exception.php';
throw new IfwPsn_Vendor_Zend_Filter_Exception('Please give a envelope key for decryption with Openssl');
}
foreach ($this->_keys['private'] as $key => $cert) {
$keys = openssl_pkey_get_private($cert, $this->getPassphrase());
}
if ($this->_package) {
$details = openssl_pkey_get_details($keys);
if ($details !== false) {
$fingerprint = md5($details['key']);
} else {
$fingerprint = md5("ZendFramework");
}
$count = unpack('ncount', $value);
$count = $count['count'];
$length = 2;
for ($i = $count; $i > 0; --$i) {
$header = unpack('H32print/nsize', substr($value, $length, 18));
$length += 18;
if ($header['print'] == $fingerprint) {
$envelope = substr($value, $length, $header['size']);
}
$length += $header['size'];
}
// remainder of string is the value to decrypt
$value = substr($value, $length);
}
$crypt = openssl_open($value, $decrypted, $envelope, $keys);
openssl_free_key($keys);
if ($crypt === false) {
require_once IFW_PSN_LIB_ROOT . 'IfwPsn/Vendor/Zend/Filter/Exception.php';
throw new IfwPsn_Vendor_Zend_Filter_Exception('Openssl was not able to decrypt you content with the given options');
}
// decompress after decryption
if (!empty($this->_compression)) {
require_once IFW_PSN_LIB_ROOT . 'IfwPsn/Vendor/Zend/Filter/Decompress.php';
$decompress = new IfwPsn_Vendor_Zend_Filter_Decompress($this->_compression);
$decrypted = $decompress->filter($decrypted);
}
return $decrypted;
}
