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94 lines
2.5 KiB
PHP
94 lines
2.5 KiB
PHP
<?php
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/**
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* Encrypt / decrypt data using a trivial character substitution algorithm.
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*
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* This should never be used, really. However, if neither Open SSL or mcrypt are available, we don't really
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* have choice for a better double way encryption.
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* If should consider to require either Open SSL or mcrypt to avoid the usage of this class.
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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_Fallback {
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const PREFIX = 'ENC1$';
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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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/** @TODO: Should we inform the user about the security risk? and how? */
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return true;
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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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}
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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( $string ) {
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$result = '';
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for ( $i = 0; $i < strlen( $string ); $i ++ ) {
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$char = substr( $string, $i, 1 );
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$key_char = substr( $this->key, ( $i % strlen( $this->key ) ) - 1, 1 );
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$char = chr( ord( $char ) + ord( $key_char ) );
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$result .= $char;
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}
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return BackWPup_Encryption::PREFIX . self::PREFIX . $this->key_type . base64_encode( $result );
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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 ( $encrypted === false ) {
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return '';
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}
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$result = '';
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for ( $i = 0; $i < strlen( $encrypted ); $i ++ ) {
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$char = substr( $encrypted, $i, 1 );
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$key_char = substr( $this->key, ( $i % strlen( $this->key ) ) - 1, 1 );
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$char = chr( ord( $char ) - ord( $key_char ) );
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$result .= $char;
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}
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return $result;
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}
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}
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