protected static function aes_cbc_encrypt($string, $key, $iv)
{
$key_size = self::$key_size;
if (!isset(self::$openssl_encrypt_exists)) {
self::$openssl_encrypt_exists = function_exists('openssl_encrypt') && version_compare(PHP_VERSION, '5.3.3', '>=');
// We need $iv parameter.
}
if (self::$openssl_encrypt_exists) {
return openssl_encrypt($string, "aes-{$key_size}-cbc", $key, true, $iv);
}
// Info: http://www.chilkatsoft.com/p/php_aes.asp
// http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation
$cipher = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
if (mcrypt_generic_init($cipher, $key, $iv) != -1) {
$encrypted = mcrypt_generic($cipher, self::pkcs7_pad($string));
mcrypt_generic_deinit($cipher);
mcrypt_module_close($cipher);
return $encrypted;
}
return false;
}
protected static function openssl_encrypt_exists()
{
if (!isset(self::$openssl_encrypt_exists)) {
self::$openssl_encrypt_exists = function_exists('openssl_encrypt') && version_compare(PHP_VERSION, '5.3.3', '>=');
}
return self::$openssl_encrypt_exists;
}
protected static function aes_cbc_encrypt($string, $key, $iv)
{
$key_size = self::$key_size;
if (!isset(self::$openssl_encrypt_exists)) {
self::$openssl_encrypt_exists = function_exists('openssl_encrypt') && version_compare(PHP_VERSION, '5.3.3', '>=');
// We need $iv parameter.
}
if (self::$openssl_encrypt_exists) {
return openssl_encrypt($string, "aes-{$key_size}-cbc", $key, true, $iv);
}
if (!isset(self::$mcrypt_exists)) {
self::$mcrypt_exists = function_exists('mcrypt_encrypt');
}
if (self::$mcrypt_exists) {
// Info: http://www.chilkatsoft.com/p/php_aes.asp
// http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation
$cipher = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
if (mcrypt_generic_init($cipher, $key, $iv) != -1) {
$encrypted = mcrypt_generic($cipher, self::pkcs7_pad($string));
mcrypt_generic_deinit($cipher);
mcrypt_module_close($cipher);
return $encrypted;
}
return false;
}
if (!isset(self::$openssl_cli_exists)) {
self::$openssl_cli_exists = self::openssl_cli_exists();
}
if (self::$openssl_cli_exists) {
$cmd = 'echo ' . self::escapeshellarg($string) . ' | openssl enc -e -a -A -aes-' . $key_size . '-cbc -K ' . self::strtohex($key) . ' -iv ' . self::strtohex($iv);
exec($cmd, $output, $return);
if ($return == 0 && isset($output[0])) {
return base64_decode($output[0]);
}
return false;
}
trigger_error('GibberishAES: System requirements failure, please, check them.', E_USER_WARNING);
return false;
}
