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<?php
/**
* Class responsible for encrypting and decrypting data.
*
* @package Mailchimp
*/
// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
exit;
}
/**
* Class Mailchimp_Data_Encryption
*
* @since 1.6.0
*/
class Mailchimp_Data_Encryption {
/**
* Key to use for encryption.
*
* @since 1.6.0
* @var string
*/
private $key;
/**
* Salt to use for encryption.
*
* @since 1.6.0
* @var string
*/
private $salt;
/**
* Constructor.
*
* @since 1.6.0
*/
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 is used. Otherwise the default key is used.
*
* @since 1.6.0
*
* @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 ); // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_encode
}
/**
* Decrypts a value.
*
* If a user-based key is set, that is used. Otherwise the default key is used.
*
* @since 1.6.0
*
* @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 ); // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_decode
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( $this->salt ) );
}
/**
* Gets the default encryption key to use.
*
* @since 1.6.0
*
* @return string Default (not user-based) encryption key.
*/
private function get_default_key() {
if ( defined( 'MAILCHIMP_SF_ENCRYPTION_KEY' ) && '' !== MAILCHIMP_SF_ENCRYPTION_KEY ) {
return MAILCHIMP_SF_ENCRYPTION_KEY;
}
if ( defined( 'LOGGED_IN_KEY' ) && '' !== LOGGED_IN_KEY ) {
return LOGGED_IN_KEY;
}
// Ideally this default is never used but we have it just in case.
return 'vJgwa_qf0u(k!uir[rB);g;DciNAKuX;+q&`A+z&m6kX3Y|$q.U3:Q>!$)6CA+=O';
}
/**
* Gets the default encryption salt to use.
*
* @since 1.6.0
*
* @return string Encryption salt.
*/
private function get_default_salt() {
if ( defined( 'MAILCHIMP_SF_ENCRYPTION_SALT' ) && '' !== MAILCHIMP_SF_ENCRYPTION_SALT ) {
return MAILCHIMP_SF_ENCRYPTION_SALT;
}
if ( defined( 'LOGGED_IN_SALT' ) && '' !== LOGGED_IN_SALT ) {
return LOGGED_IN_SALT;
}
// Ideally this default is never used but we have it just in case.
return '|qhC}/w6q+$V`H>wM:AtNpg/{s)g<k{F:WMcvJJD[K6c_Kb1OEy^Yx7f|$Ovm+X|';
}
}