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https://git.sindominio.net/estibadores/wordpress.git
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122 lines
3.5 KiB
PHP
122 lines
3.5 KiB
PHP
<?php
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/**
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* Encrypt / decrypt data using mcrypt.
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*
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* This is the method used with PHP 5.2 or when Open SSL is not available.
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*
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* mcrypt is abandonware and has unpatched bugs, however because of PHP 5.2 support we still support it.
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* We also use mcrypt in more modern PHP version when Open SSL is not available and in the case that we are in
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* PHP 7.1 we call mcrypt with the mute operator to avoid warnings.
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*
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* Normally we should implement an interface, but at the moment with PHP 5.2 and the "poor" autoloader we have,
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* an interface would just be another file in "/inc" folder causing confusion. Also, I don't want to create an
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* 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
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* WP coding standard, we finally could consider to introduce an interface.
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*/
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class BackWPup_Encryption_Mcrypt {
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const PREFIX = 'RIJNDAEL$';
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/**
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* @var bool
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*/
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private $deprecated = false;
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/**
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* @return bool
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*/
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public static function supported() {
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return function_exists( 'mcrypt_encrypt' );
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}
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/**
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* @param string $enc_key
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* @param string $key_type
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*/
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public function __construct( $enc_key, $key_type ) {
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$this->key = md5( (string) $enc_key );
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$this->key_type = (string) $key_type;
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$this->deprecated = (bool) version_compare( PHP_VERSION, '7.1', '>=' );
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/** @TODO: Should we do something here to inform user about deprecation? */
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}
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/**
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*
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* Encrypt a string (Passwords)
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*
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* @param string $string value to encrypt
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*
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* @return string encrypted string
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*/
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public function encrypt( $string ) {
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if ( ! is_string( $string ) || ! $string ) {
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return '';
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}
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$encrypted = $this->deprecated
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? @mcrypt_encrypt( MCRYPT_RIJNDAEL_256, $this->key, $string, MCRYPT_MODE_CBC, md5( $this->key ) )
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: mcrypt_encrypt( MCRYPT_RIJNDAEL_256, $this->key, $string, MCRYPT_MODE_CBC, md5( $this->key ) );
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return BackWPup_Encryption::PREFIX . self::PREFIX . $this->key_type . base64_encode( $encrypted );
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}
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/**
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*
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* Decrypt a string (Passwords)
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*
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* @param string $string value to decrypt
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*
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* @return string decrypted string
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*/
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public function decrypt( $string ) {
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if (
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! is_string( $string )
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|| ! $string
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|| strpos( $string, BackWPup_Encryption::PREFIX . self::PREFIX . $this->key_type ) !== 0
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) {
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return '';
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}
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$no_prefix = substr( $string, strlen( BackWPup_Encryption::PREFIX . self::PREFIX . $this->key_type ) );
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$encrypted = base64_decode( $no_prefix, true );
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if ( $encrypted === false ) {
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return '';
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}
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if ( defined( 'BACKWPUP_MCRYPT_KEY_MODE' ) && BACKWPUP_MCRYPT_KEY_MODE === 1 ) {
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return $this->decrypt_deprecated( $encrypted );
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}
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$decrypted = $this->deprecated
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? @mcrypt_decrypt( MCRYPT_RIJNDAEL_256, $this->key, $encrypted, MCRYPT_MODE_CBC, md5( $this->key ) )
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: mcrypt_decrypt( MCRYPT_RIJNDAEL_256, $this->key, $encrypted, MCRYPT_MODE_CBC, md5( $this->key ) );
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$skip_deprecated = defined( 'BACKWPUP_MCRYPT_KEY_MODE' ) && BACKWPUP_MCRYPT_KEY_MODE === 2;
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if ( ! $skip_deprecated && ! @wp_check_invalid_utf8( $decrypted ) ) {
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$decrypted = $this->decrypt_deprecated( $encrypted );
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}
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return $decrypted;
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}
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/**
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* @param string $encrypted
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*
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* @return string
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*/
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private function decrypt_deprecated( $encrypted ) {
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$key = md5( $this->key );
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return $this->deprecated
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? @mcrypt_decrypt( MCRYPT_RIJNDAEL_256, $key, $encrypted, MCRYPT_MODE_CBC, md5( $key ) )
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: mcrypt_decrypt( MCRYPT_RIJNDAEL_256, $key, $encrypted, MCRYPT_MODE_CBC, md5( $key ) );
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}
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}
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