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scrambler.php
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scrambler.php
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<?php
//========================================================================
// Author: Pascal KISSIAN
// Resume: http://pascal.kissian.net
//
// Copyright (c) 2015-2020 Pascal KISSIAN
//
// Published under the MIT License
// Consider it as a proof of concept!
// No warranty of any kind.
// Use and abuse at your own risks.
//========================================================================
// case-sensitive: variable names, constant name, array keys, class properties, labels
// case-insensitive: function names, class names, class method names, namespaces, keywords and constructs
// classes, interfaces, and traits share the same internal naming_space! only a single Scrambler instance for all of them!
class Scrambler
{
const SCRAMBLER_CONTEXT_VERSION = '1.1';
private $t_first_chars = null; // allowed first char of a generated identifier
private $t_chars = null; // allowed all except first char of a generated identifier
private $l1 = null; // length of $t_first_chars string
private $l2 = null; // length of $t_chars string
private $r = null; // seed and salt for random char generation, modified at each iteration.
private $scramble_type = null; // type on which scrambling is done (i.e. variable, function, etc.)
private $case_sensitive = null; // self explanatory
private $scramble_mode = null; // allowed modes are 'identifier', 'hexa', 'numeric'
private $scramble_length = null; // current length of scrambled names
private $scramble_length_min = null; // min length of scrambled names
private $scramble_length_max = null; // max length of scrambled names
private $t_ignore = null; // array where keys are names to ignore.
private $t_ignore_prefix = null; // array where keys are prefix of names to ignore.
private $t_scramble = null; // array of scrambled items (key = source name , value = scrambled name)
private $t_rscramble = null; // array of reversed scrambled items (key = scrambled name, value = source name)
private $context_directory = null; // where to save/restore context
private $silent = null; // display or not Information level messages.
private $label_counter = 0; // internal label counter.
private $t_reserved_variable_names = array( 'this','GLOBALS','_SERVER', '_GET', '_POST', '_FILES', '_COOKIE','_SESSION', '_ENV', '_REQUEST',
'php_errormsg','HTTP_RAW_POST_DATA','http_response_header','argc','argv'
);
private $t_reserved_function_names = array( '__halt_compiler','__autoload', 'abstract', 'and', 'array', 'as', 'bool', 'break', 'callable', 'case', 'catch',
'class', 'clone', 'const', 'continue', 'declare', 'default', 'die', 'do', 'echo', 'else',
'elseif', 'empty', 'enddeclare', 'endfor', 'endforeach', 'endif', 'endswitch', 'endwhile',
'eval', 'exit', 'extends', 'false', 'final', 'finally', 'float', 'for', 'foreach', 'function', 'global', 'goto', 'if','fn',
'implements', 'include', 'include_once', 'instanceof', 'insteadof', 'int', 'interface', 'isset', 'list',
'namespace', 'new', 'null', 'or', 'print', 'private', 'protected', 'public', 'require', 'require_once',
'return', 'static', 'string', 'switch', 'throw', 'trait', 'true', 'try', 'unset', 'use', 'var', 'while', 'xor','yield',
'apache_request_headers' // seems that it is not included in get_defined_functions ..
);
private $t_reserved_class_names = array('parent', 'self', 'static', // same reserved names for classes, interfaces and traits...
'int', 'float', 'bool', 'string', 'true', 'false', 'null', 'void', 'iterable', 'object', 'resource', 'scalar', 'mixed', 'numeric','fn'
);
private $t_reserved_method_names = array('__construct', '__destruct', '__call', '__callstatic', '__get', '__set', '__isset', '__unset', '__sleep', '__wakeup', '__tostring', '__invoke', '__set_state', '__clone','__debuginfo' );
function __construct($type,$conf,$target_directory)
{
global $t_pre_defined_classes,$t_pre_defined_class_methods,$t_pre_defined_class_properties,$t_pre_defined_class_constants;
global $t_pre_defined_class_methods_by_class,$t_pre_defined_class_properties_by_class,$t_pre_defined_class_constants_by_class;
$this->scramble_type = $type;
$this->t_first_chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
$this->t_chars = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_';
$this->r = md5(microtime(true)); // random seed
$this->t_scramble = array();
$this->silent = $conf->silent;
if (isset($conf->scramble_mode))
{
switch($conf->scramble_mode)
{
case 'numeric':
$this->scramble_length_max = 32;
$this->scramble_mode = $conf->scramble_mode;
$this->t_first_chars = 'O';
$this->t_chars = '0123456789';
break;
case 'hexa':
$this->scramble_length_max = 32;
$this->scramble_mode = $conf->scramble_mode;
$this->t_first_chars = 'abcdefABCDEF';
break;
case 'identifier':
default:
$this->scramble_length_max = 16;
$this->scramble_mode = 'identifier';
}
}
$this->l1 = strlen($this->t_first_chars)-1;
$this->l2 = strlen($this->t_chars )-1;
$this->scramble_length_min = 2;
$this->scramble_length = 5;
if (isset($conf->scramble_length))
{
$conf->scramble_length += 0;
if ( ($conf->scramble_length >= $this->scramble_length_min) && ($conf->scramble_length <= $this->scramble_length_max) )
{
$this->scramble_length = $conf->scramble_length;
}
}
switch($type)
{
case 'constant':
$this->case_sensitive = true;
$this->t_ignore = array_flip($this->t_reserved_function_names);
$this->t_ignore = array_merge($this->t_ignore,get_defined_constants(false));
if (isset($conf->t_ignore_constants))
{
$t = $conf->t_ignore_constants; $t = array_flip($t);
$this->t_ignore = array_merge($this->t_ignore,$t);
}
if (isset($conf->t_ignore_constants_prefix))
{
$t = $conf->t_ignore_constants_prefix; $t = array_flip($t);
$this->t_ignore_prefix = $t;
}
break;
case 'class_constant':
$this->case_sensitive = true;
$this->t_ignore = array_flip($this->t_reserved_function_names);
$this->t_ignore = array_merge($this->t_ignore,get_defined_constants(false));
if ($conf->t_ignore_pre_defined_classes!='none')
{
if ($conf->t_ignore_pre_defined_classes=='all') $this->t_ignore = array_merge($this->t_ignore,$t_pre_defined_class_constants);
if (is_array($conf->t_ignore_pre_defined_classes))
{
$t_class_names = array_map('strtolower',$conf->t_ignore_pre_defined_classes);
foreach($t_class_names as $class_name) if (isset($t_pre_defined_class_constants_by_class[$class_name])) $this->t_ignore = array_merge($this->t_ignore,$t_pre_defined_class_constants_by_class[$class_name]);
}
}
if (isset($conf->t_ignore_class_constants))
{
$t = $conf->t_ignore_class_constants; $t = array_flip($t);
$this->t_ignore = array_merge($this->t_ignore,$t);
}
if (isset($conf->t_ignore_class_constants_prefix))
{
$t = $conf->t_ignore_class_constants_prefix; $t = array_flip($t);
$this->t_ignore_prefix = $t;
}
break;
case 'variable':
$this->case_sensitive = true;
$this->t_ignore = array_flip($this->t_reserved_variable_names);
if (isset($conf->t_ignore_variables))
{
$t = $conf->t_ignore_variables; $t = array_flip($t);
$this->t_ignore = array_merge($this->t_ignore,$t);
}
if (isset($conf->t_ignore_variables_prefix))
{
$t = $conf->t_ignore_variables_prefix; $t = array_flip($t);
$this->t_ignore_prefix = $t;
}
break;
/*
case 'function':
$this->case_sensitive = false;
$this->t_ignore = array_flip($this->t_reserved_function_names);
$t = get_defined_functions(); $t = array_map('strtolower',$t['internal']); $t = array_flip($t);
$this->t_ignore = array_merge($this->t_ignore,$t);
if (isset($conf->t_ignore_functions))
{
$t = $conf->t_ignore_functions; $t = array_map('strtolower',$t); $t = array_flip($t);
$this->t_ignore = array_merge($this->t_ignore,$t);
}
if (isset($conf->t_ignore_functions_prefix))
{
$t = $conf->t_ignore_functions_prefix; $t = array_map('strtolower',$t); $t = array_flip($t);
$this->t_ignore_prefix = $t;
}
break;
*/
case 'property':
$this->case_sensitive = true;
$this->t_ignore = array_flip($this->t_reserved_variable_names);
if ($conf->t_ignore_pre_defined_classes!='none')
{
if ($conf->t_ignore_pre_defined_classes=='all') $this->t_ignore = array_merge($this->t_ignore,$t_pre_defined_class_properties);
if (is_array($conf->t_ignore_pre_defined_classes))
{
$t_class_names = array_map('strtolower',$conf->t_ignore_pre_defined_classes);
foreach($t_class_names as $class_name) if (isset($t_pre_defined_class_properties_by_class[$class_name])) $this->t_ignore = array_merge($this->t_ignore,$t_pre_defined_class_properties_by_class[$class_name]);
}
}
if (isset($conf->t_ignore_properties))
{
$t = $conf->t_ignore_properties; $t = array_flip($t);
$this->t_ignore = array_merge($this->t_ignore,$t);
}
if (isset($conf->t_ignore_properties_prefix))
{
$t = $conf->t_ignore_properties_prefix; $t = array_flip($t);
$this->t_ignore_prefix = $t;
}
break;
case 'function_or_class': // same instance is used for scrambling classes, interfaces, and traits. and namespaces... and functions ...for aliasing
$this->case_sensitive = false;
$this->t_ignore = array_flip($this->t_reserved_function_names);
$t = get_defined_functions(); $t = array_map('strtolower',$t['internal']); $t = array_flip($t);
$this->t_ignore = array_merge($this->t_ignore,$t);
if (isset($conf->t_ignore_functions))
{
$t = $conf->t_ignore_functions; $t = array_map('strtolower',$t); $t = array_flip($t);
$this->t_ignore = array_merge($this->t_ignore,$t);
}
if (isset($conf->t_ignore_functions_prefix))
{
$t = $conf->t_ignore_functions_prefix; $t = array_map('strtolower',$t); $t = array_flip($t);
$this->t_ignore_prefix = $t;
}
$this->t_ignore = array_merge($this->t_ignore, array_flip($this->t_reserved_class_names));
$this->t_ignore = array_merge($this->t_ignore, array_flip($this->t_reserved_variable_names));
// $this->t_ignore = array_merge($this->t_ignore, array_flip($this->t_reserved_function_names));
$t = get_defined_functions(); $t = array_flip($t['internal']);
$this->t_ignore = array_merge($this->t_ignore,$t);
if ($conf->t_ignore_pre_defined_classes!='none')
{
if ($conf->t_ignore_pre_defined_classes=='all') $this->t_ignore = array_merge($this->t_ignore,$t_pre_defined_classes);
if (is_array($conf->t_ignore_pre_defined_classes))
{
$t_class_names = array_map('strtolower',$conf->t_ignore_pre_defined_classes);
foreach($t_class_names as $class_name) if (isset($t_pre_defined_classes[$class_name])) $this->t_ignore[$class_name] = 1;
}
}
if (isset($conf->t_ignore_classes))
{
$t = $conf->t_ignore_classes; $t = array_map('strtolower',$t); $t = array_flip($t);
$this->t_ignore = array_merge($this->t_ignore,$t);
}
if (isset($conf->t_ignore_interfaces))
{
$t = $conf->t_ignore_interfaces; $t = array_map('strtolower',$t); $t = array_flip($t);
$this->t_ignore = array_merge($this->t_ignore,$t);
}
if (isset($conf->t_ignore_traits))
{
$t = $conf->t_ignore_traits; $t = array_map('strtolower',$t); $t = array_flip($t);
$this->t_ignore = array_merge($this->t_ignore,$t);
}
if (isset($conf->t_ignore_namespaces))
{
$t = $conf->t_ignore_namespaces; $t = array_map('strtolower',$t); $t = array_flip($t);
$this->t_ignore = array_merge($this->t_ignore,$t);
}
if (isset($conf->t_ignore_classes_prefix))
{
$t = $conf->t_ignore_classes_prefix; $t = array_map('strtolower',$t); $t = array_flip($t);
$this->t_ignore_prefix = array_merge($this->t_ignore_prefix,$t);
}
if (isset($conf->t_ignore_interfaces_prefix))
{
$t = $conf->t_ignore_interfaces_prefix; $t = array_map('strtolower',$t); $t = array_flip($t);
$this->t_ignore_prefix = array_merge($this->t_ignore_prefix,$t);
}
if (isset($conf->t_ignore_traits_prefix))
{
$t = $conf->t_ignore_traits_prefix; $t = array_map('strtolower',$t); $t = array_flip($t);
$this->t_ignore_prefix = array_merge($this->t_ignore_prefix,$t);
}
if (isset($conf->t_ignore_namespaces_prefix))
{
$t = $conf->t_ignore_namespaces_prefix; $t = array_map('strtolower',$t); $t = array_flip($t);
$this->t_ignore_prefix = array_merge($this->t_ignore_prefix,$t);
}
break;
case 'method':
$this->case_sensitive = false;
if ($conf->parser_mode=='ONLY_PHP7') $this->t_ignore = array(); // in php7 method names can be keywords
else $this->t_ignore = array_flip($this->t_reserved_function_names);
$t = array_flip($this->t_reserved_method_names);
$this->t_ignore = array_merge($this->t_ignore,$t);
$t = get_defined_functions(); $t = array_map('strtolower',$t['internal']); $t = array_flip($t);
$this->t_ignore = array_merge($this->t_ignore,$t);
if ($conf->t_ignore_pre_defined_classes!='none')
{
if ($conf->t_ignore_pre_defined_classes=='all') $this->t_ignore = array_merge($this->t_ignore,$t_pre_defined_class_methods);
if (is_array($conf->t_ignore_pre_defined_classes))
{
$t_class_names = array_map('strtolower',$conf->t_ignore_pre_defined_classes);
foreach($t_class_names as $class_name) if (isset($t_pre_defined_class_methods_by_class[$class_name])) $this->t_ignore = array_merge($this->t_ignore,$t_pre_defined_class_methods_by_class[$class_name]);
}
}
if (isset($conf->t_ignore_methods))
{
$t = $conf->t_ignore_methods; $t = array_map('strtolower',$t); $t = array_flip($t);
$this->t_ignore = array_merge($this->t_ignore,$t);
}
if (isset($conf->t_ignore_methods_prefix))
{
$t = $conf->t_ignore_methods_prefix; $t = array_map('strtolower',$t); $t = array_flip($t);
$this->t_ignore_prefix = $t;
}
break;
case 'label':
$this->case_sensitive = true;
$this->t_ignore = array_flip($this->t_reserved_function_names);
if (isset($conf->t_ignore_labels))
{
$t = $conf->t_ignore_labels; $t = array_flip($t);
$this->t_ignore = array_merge($this->t_ignore,$t);
}
if (isset($conf->t_ignore_labels_prefix))
{
$t = $conf->t_ignore_labels_prefix; $t = array_flip($t);
$this->t_ignore_prefix = $t;
}
break;
}
if (isset($target_directory)) // the constructor will restore previous saved context if exists
{
$this->context_directory = $target_directory;
if (file_exists("{$this->context_directory}/yakpro-po/context/{$this->scramble_type}"))
{
$t = unserialize(file_get_contents("{$this->context_directory}/yakpro-po/context/{$this->scramble_type}"));
if ($t[0] !== self::SCRAMBLER_CONTEXT_VERSION)
{
fprintf(STDERR,"Error:\tContext format has changed! run with --clean option!".PHP_EOL);
$this->context_directory = null; // do not overwrite incoherent values when exiting
exit(1);
}
$this->t_scramble = $t[1];
$this->t_rscramble = $t[2];
$this->scramble_length = $t[3];
$this->label_counter = $t[4];
}
}
}
function __destruct()
{
//print_r($this->t_scramble);
if (!$this->silent) fprintf(STDERR,"Info:\t[%-17s] scrambled \t: %8d%s",$this->scramble_type,count($this->t_scramble),PHP_EOL);
if (isset($this->context_directory)) // the destructor will save the current context
{
$t = array();
$t[0] = self::SCRAMBLER_CONTEXT_VERSION;
$t[1] = $this->t_scramble;
$t[2] = $this->t_rscramble;
$t[3] = $this->scramble_length;
$t[4] = $this->label_counter;
file_put_contents("{$this->context_directory}/yakpro-po/context/{$this->scramble_type}",serialize($t));
}
}
private function str_scramble($s) // scramble the string according parameters
{
$c1 = $this->t_first_chars[mt_rand(0, $this->l1)]; // first char of the identifier
$c2 = $this->t_chars [mt_rand(0, $this->l2)]; // prepending salt for md5
$this->r = str_shuffle(md5($c2.$s.md5($this->r))); // 32 chars random hex number derived from $s and lot of pepper and salt
$s = $c1;
switch($this->scramble_mode)
{
case 'numeric':
for($i=0,$l=$this->scramble_length-1;$i<$l;++$i) $s .= $this->t_chars[base_convert(substr($this->r,$i,2),16,10)%($this->l2+1)];
break;
case 'hexa':
for($i=0,$l=$this->scramble_length-1;$i<$l;++$i) $s .= substr($this->r,$i,1);
break;
case 'identifier':
default:
for($i=0,$l=$this->scramble_length-1;$i<$l;++$i) $s .= $this->t_chars[base_convert(substr($this->r,2*$i,2),16,10)%($this->l2+1)];
}
return $s;
}
private function case_shuffle($s) // this function is used to even more obfuscate insensitive names: on each acces to the name, a different randomized case of each letter is used.
{
for($i=0;$i<strlen($s);++$i) $s[$i] = mt_rand(0,1) ? strtoupper($s[$i]) : strtolower($s[$i]);
return $s;
}
public function scramble($s)
{
$r = $this->case_sensitive ? $s : strtolower($s);
if ( array_key_exists($r,$this->t_ignore) ) return $s;
if (isset($this->t_ignore_prefix))
{
foreach($this->t_ignore_prefix as $key => $dummy) if (substr($r,0,strlen($key))===$key) return $s;
}
if (!isset($this->t_scramble[$r])) // if not already scrambled:
{
for($i=0;$i<50;++$i) // try at max 50 times if the random generated scrambled string has already beeen generated!
{
$x = $this->str_scramble($s);
$z = strtolower($x);
$y = $this->case_sensitive ? $x : $z;
if (isset($this->t_rscramble[$y]) || isset($this->t_ignore[$z]) ) // this random value is either already used or a reserved name
{
if (($i==5) && ($this->scramble_length < $this->scramble_length_max)) ++$this->scramble_length; // if not found after 5 attempts, increase the length...
continue; // the next attempt will always be successfull, unless we already are maxlength
}
$this->t_scramble [$r] = $y;
$this->t_rscramble[$y] = $r;
break;
}
if (!isset($this->t_scramble[$r]))
{
fprintf(STDERR,"Scramble Error: Identifier not found after 50 iterations!%sAborting...%s",PHP_EOL,PHP_EOL); // should statistically never occur!
exit(2);
}
}
return $this->case_sensitive ? $this->t_scramble[$r] : $this->case_shuffle($this->t_scramble[$r]);
}
public function unscramble($s)
{
if (!$this->case_sensitive) $s = strtolower($s);
return isset($this->t_rscramble[$s]) ? $this->t_rscramble[$s] : '';
}
public function generate_label_name($prefix = "!label")
{
return $prefix.($this->label_counter++);
}
}
?>