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<?php
/**
* Encrypt / decrypt data using mcrypt.
*
* This is the method used with PHP 5.2 or when Open SSL is not available.
*
* mcrypt is abandonware and has unpatched bugs, however because of PHP 5.2 support we still support it.
* We also use mcrypt in more modern PHP version when Open SSL is not available and in the case that we are in
* PHP 7.1 we call mcrypt with the mute operator to avoid warnings.
*
* Normally we should implement an interface, but at the moment with PHP 5.2 and the "poor" autoloader we have,
* an interface would just be another file in "/inc" folder causing confusion. Also, I don't want to create an
* interface in a file named `class-...php`. When we get rid of PHP 5.2, we setup a better autoloader and we get rid of
* WP coding standard, we finally could consider to introduce an interface.
*/
class BackWPup_Encryption_Mcrypt {
public const PREFIX = 'RIJNDAEL$';
/**
* Encryption key.
*
* @var string
*/
private $key;
/**
* Encryption key type.
*
* @var string
*/
private $key_type;
/**
* Whether to use deprecated mcrypt handling.
*
* @var bool
*/
private $deprecated = false;
/**
* Initialize the mcrypt encryptor.
*
* @param string $enc_key Encryption key.
* @param string $key_type Key type identifier.
*/
public function __construct( $enc_key, $key_type ) {
$this->key = md5( (string) $enc_key );
$this->key_type = (string) $key_type;
$this->deprecated = (bool) version_compare( PHP_VERSION, '7.1', '>=' );
// TODO: Decide how to inform users about deprecation.
}
/**
* Check whether mcrypt is available.
*
* @return bool
*/
public static function supported() {
return function_exists( 'mcrypt_encrypt' );
}
/**
* Encrypt a string (Passwords).
*
* @param string $value Value to encrypt.
*
* @return string Encrypted string.
*/
public function encrypt( $value ) {
if ( ! is_string( $value ) || ! $value ) {
return '';
}
$encrypted = $this->deprecated
? @mcrypt_encrypt( MCRYPT_RIJNDAEL_256, $this->key, $value, MCRYPT_MODE_CBC, md5( $this->key ) ) // @phpstan-ignore-line
: mcrypt_encrypt( MCRYPT_RIJNDAEL_256, $this->key, $value, MCRYPT_MODE_CBC, md5( $this->key ) ); // @phpstan-ignore-line
return BackWPup_Encryption::PREFIX . self::PREFIX . $this->key_type . base64_encode( (string) $encrypted ); // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_encode -- Binary-safe encoding.
}
/**
* Decrypt a string (Passwords).
*
* @param string $value Value to decrypt.
*
* @return string Decrypted string.
*/
public function decrypt( $value ) {
if (
! is_string( $value )
|| ! $value
|| 0 !== strpos( $value, BackWPup_Encryption::PREFIX . self::PREFIX . $this->key_type )
) {
return '';
}
$no_prefix = substr( $value, strlen( BackWPup_Encryption::PREFIX . self::PREFIX . $this->key_type ) );
$encrypted = base64_decode( $no_prefix, true ); // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_decode -- Binary-safe decoding.
if ( false === $encrypted ) {
return '';
}
if ( defined( 'BACKWPUP_MCRYPT_KEY_MODE' ) && 1 === BACKWPUP_MCRYPT_KEY_MODE ) {
return $this->decrypt_deprecated( $encrypted );
}
$decrypted = $this->deprecated
? @mcrypt_decrypt( MCRYPT_RIJNDAEL_256, $this->key, $encrypted, MCRYPT_MODE_CBC, md5( $this->key ) ) // @phpstan-ignore-line
: mcrypt_decrypt( MCRYPT_RIJNDAEL_256, $this->key, $encrypted, MCRYPT_MODE_CBC, md5( $this->key ) ); // @phpstan-ignore-line
$skip_deprecated = defined( 'BACKWPUP_MCRYPT_KEY_MODE' ) && 2 === BACKWPUP_MCRYPT_KEY_MODE;
if ( ! $skip_deprecated && ! @wp_check_invalid_utf8( $decrypted ) ) {
$decrypted = $this->decrypt_deprecated( $encrypted );
}
return $decrypted;
}
/**
* Decrypt using legacy key derivation.
*
* @param string $encrypted Encrypted value.
*
* @return string
*/
private function decrypt_deprecated( $encrypted ) {
$key = md5( $this->key );
return $this->deprecated
? @mcrypt_decrypt( MCRYPT_RIJNDAEL_256, $key, $encrypted, MCRYPT_MODE_CBC, md5( $key ) ) // @phpstan-ignore-line
: mcrypt_decrypt( MCRYPT_RIJNDAEL_256, $key, $encrypted, MCRYPT_MODE_CBC, md5( $key ) ); // @phpstan-ignore-line
}
}