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<?php
/**
* Class Google\Site_Kit\Core\Storage\Data_Encryption
*
* @package Google\Site_Kit
* @copyright 2021 Google LLC
* @license https://www.apache.org/licenses/LICENSE-2.0 Apache License 2.0
* @link https://sitekit.withgoogle.com
*/
namespace Google\Site_Kit\Core\Storage;
/**
* Class responsible for encrypting and decrypting data.
*
* @since 1.0.0
* @access private
* @ignore
*/
final class Data_Encryption {
/**
* Key to use for encryption.
*
* @since 1.0.0
* @var string
*/
private $key;
/**
* Salt to use for encryption.
*
* @since 1.0.0
* @var string
*/
private $salt;
/**
* Constructor.
*
* @since 1.0.0
*/
public function __construct() {
$this->key = $this->get_default_key();
$this->salt = $this->get_default_salt();
}
/**
* Encrypts a value.
*
* If a user-based key is set, that key is used. Otherwise the default key is used.
*
* @since 1.0.0
*
* @param string $value Value to encrypt.
* @return string|bool Encrypted value, or false on failure.
*/
public function encrypt( $value ) {
if ( ! extension_loaded( 'openssl' ) ) {
return $value;
}
$method = 'aes-256-ctr';
$ivlen = openssl_cipher_iv_length( $method );
$iv = openssl_random_pseudo_bytes( $ivlen );
$raw_value = openssl_encrypt( $value . $this->salt, $method, $this->key, 0, $iv );
if ( ! $raw_value ) {
return false;
}
return base64_encode( $iv . $raw_value );
}
/**
* Decrypts a value.
*
* If a user-based key is set, that key is used. Otherwise the default key is used.
*
* @since 1.0.0
*
* @param string $raw_value Value to decrypt.
* @return string|bool Decrypted value, or false on failure.
*/
public function decrypt( $raw_value ) {
if ( ! extension_loaded( 'openssl' ) || ! is_string( $raw_value ) ) {
return $raw_value;
}
$decoded_value = base64_decode( $raw_value, true );
if ( false === $decoded_value ) {
return $raw_value;
}
$method = 'aes-256-ctr';
$ivlen = openssl_cipher_iv_length( $method );
$iv = substr( $decoded_value, 0, $ivlen );
$decoded_value = substr( $decoded_value, $ivlen );
$value = openssl_decrypt( $decoded_value, $method, $this->key, 0, $iv );
if ( ! $value || substr( $value, - strlen( $this->salt ) ) !== $this->salt ) {
return false;
}
return substr( $value, 0, - strlen( $this->salt ) );
}
/**
* Gets the default encryption key to use.
*
* @since 1.0.0
*
* @return string Default (not user-based) encryption key.
*/
private function get_default_key() {
if ( defined( 'GOOGLESITEKIT_ENCRYPTION_KEY' ) && '' !== GOOGLESITEKIT_ENCRYPTION_KEY ) {
return GOOGLESITEKIT_ENCRYPTION_KEY;
}
if ( defined( 'LOGGED_IN_KEY' ) && '' !== LOGGED_IN_KEY ) {
return LOGGED_IN_KEY;
}
// If this is reached, you're either not on a live site or have a serious security issue.
return 'das-ist-kein-geheimer-schluessel';
}
/**
* Gets the default encryption salt to use.
*
* @since 1.0.0
*
* @return string Encryption salt.
*/
private function get_default_salt() {
if ( defined( 'GOOGLESITEKIT_ENCRYPTION_SALT' ) && '' !== GOOGLESITEKIT_ENCRYPTION_SALT ) {
return GOOGLESITEKIT_ENCRYPTION_SALT;
}
if ( defined( 'LOGGED_IN_SALT' ) && '' !== LOGGED_IN_SALT ) {
return LOGGED_IN_SALT;
}
// If this is reached, you're either not on a live site or have a serious security issue.
return 'das-ist-kein-geheimes-salz';
}
}