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File Name : Data_Encryption.php

<?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';
	}
}

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	makefntq/makefntq	0755	2025-12-02 03:21:05
..	dir	-	makefntq/makefntq	0755	2025-12-02 03:21:05
Setting	dir	-	makefntq/makefntq	0755	2025-12-02 03:21:05
Cache.php	text/x-php	3.32 KB	makefntq/makefntq	0644	2024-07-15 11:57:20
Data_Encryption.php	text/x-php	3.38 KB	makefntq/makefntq	0644	2023-11-22 12:43:40
Encrypted_Options.php	text/x-php	2.37 KB	makefntq/makefntq	0644	2021-02-02 04:33:04
Encrypted_User_Options.php	text/x-php	2.83 KB	makefntq/makefntq	0644	2021-02-02 04:33:04
Meta_Interface.php	text/x-php	2.09 KB	makefntq/makefntq	0644	2025-02-10 11:32:32
Meta_Setting_Trait.php	text/x-php	4.04 KB	makefntq/makefntq	0644	2025-02-10 11:32:32
Options.php	text/x-php	2.87 KB	makefntq/makefntq	0644	2024-07-15 11:57:20
Options_Interface.php	text/x-php	1.33 KB	makefntq/makefntq	0644	2021-02-02 04:33:04
Post_Meta.php	text/x-php	2.21 KB	makefntq/makefntq	0644	2025-02-10 11:32:32
Setting.php	text/x-php	4 KB	makefntq/makefntq	0644	2024-01-17 01:06:18
Setting_With_Legacy_Keys_Trait.php	text/x-php	1.04 KB	makefntq/makefntq	0644	2024-07-15 11:57:20
Setting_With_Owned_Keys_Interface.php	text/x-php	664 B	makefntq/makefntq	0644	2024-07-15 11:57:20
Setting_With_Owned_Keys_Trait.php	text/x-php	2.9 KB	makefntq/makefntq	0644	2024-07-15 11:57:20
Setting_With_ViewOnly_Keys_Interface.php	text/x-php	688 B	makefntq/makefntq	0644	2024-07-15 11:57:20
Term_Meta.php	text/x-php	2.21 KB	makefntq/makefntq	0644	2025-02-10 11:32:32
Transients.php	text/x-php	2.07 KB	makefntq/makefntq	0644	2024-07-15 11:57:20
User_Aware_Interface.php	text/x-php	819 B	makefntq/makefntq	0644	2024-07-15 11:57:20
User_Aware_Trait.php	text/x-php	1.42 KB	makefntq/makefntq	0644	2024-07-15 11:57:20
User_Options.php	text/x-php	2.93 KB	makefntq/makefntq	0644	2024-07-15 11:57:20
User_Options_Interface.php	text/x-php	1.34 KB	makefntq/makefntq	0644	2024-07-15 11:57:20
User_Setting.php	text/x-php	3.28 KB	makefntq/makefntq	0644	2021-02-02 04:33:04
User_Transients.php	text/x-php	7.46 KB	makefntq/makefntq	0644	2024-07-15 11:57:20

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