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<?php
/**
*
*/
class BackWPup_Encryption {
/**
*
* Encrypt a string (Passwords)
*
* @param string $string value to encrypt
*
* @return string encrypted string
*/
public static function encrypt( $string ) {
if ( empty( $string ) ) {
return $string;
}
//only encrypt if needed
if ( strpos( $string, '$BackWPup$ENC1$' ) !== FALSE || strpos( $string, '$BackWPup$RIJNDAEL$' ) !== FALSE ) {
if ( strpos( $string, '$BackWPup$ENC1$O$' ) !== FALSE && strpos( $string, '$BackWPup$RIJNDAEL$O$' ) !== FALSE && defined( 'BACKWPUP_ENC_KEY' ) && BACKWPUP_ENC_KEY ) {
$string = self::decrypt( $string );
} else {
return $string;
}
}
if ( defined( 'BACKWPUP_ENC_KEY' ) && BACKWPUP_ENC_KEY ) {
$key = BACKWPUP_ENC_KEY;
$key_type = 'O$';
} else {
$key = DB_NAME . DB_USER . DB_PASSWORD;
$key_type = '';
}
$key = md5( $key );
if ( ! function_exists( 'mcrypt_encrypt' ) ) {
$result = '';
for ( $i = 0; $i < strlen( $string ); $i ++ ) {
$char = substr( $string, $i, 1 );
$keychar = substr( $key, ( $i % strlen( $key ) ) - 1, 1 );
$char = chr( ord( $char ) + ord( $keychar ) );
$result .= $char;
}
return '$BackWPup$ENC1$' . $key_type . base64_encode( $result );
}
return '$BackWPup$RIJNDAEL$' . $key_type . base64_encode( mcrypt_encrypt( MCRYPT_RIJNDAEL_256, md5( $key ), trim( $string ), MCRYPT_MODE_CBC, md5( md5( $key ) ) ) );
}
/**
*
* Decrypt a string (Passwords)
*
* @param string $string value to decrypt
*
* @return string decrypted string
*/
public static function decrypt( $string ) {
if ( empty( $string ) ) {
return $string;
}
if ( strpos( $string, '$BackWPup$ENC1$O$' ) !== FALSE || strpos( $string, '$BackWPup$RIJNDAEL$O$' ) !== FALSE ) {
$key_type = 'O$';
$key = BACKWPUP_ENC_KEY;
} else {
$key_type = '';
$key = DB_NAME . DB_USER . DB_PASSWORD;
}
$key = md5( $key );
if ( strpos( $string, '$BackWPup$ENC1$' . $key_type ) !== FALSE ) {
$string = str_replace( '$BackWPup$ENC1$' . $key_type, '', $string );
$result = '';
$string = base64_decode( $string );
for ( $i = 0; $i < strlen( $string ); $i ++ ) {
$char = substr( $string, $i, 1 );
$keychar = substr( $key, ( $i % strlen( $key ) ) - 1, 1 );
$char = chr( ord( $char ) - ord( $keychar ) );
$result .= $char;
}
return $result;
}
if ( function_exists( 'mcrypt_encrypt' ) && strpos( $string, '$BackWPup$RIJNDAEL$' . $key_type ) !== FALSE ) {
$string = str_replace( '$BackWPup$RIJNDAEL$' . $key_type, '', $string );
return trim( mcrypt_decrypt( MCRYPT_RIJNDAEL_256, md5( $key ), base64_decode( $string ), MCRYPT_MODE_CBC, md5( md5( $key ) ) ), "\0" );
}
return $string;
}
}