如何破解phpjm.net的混淆加密並解密

$file = 'plugin.php'; //要破解的文件

$fp = fopen($file, 'r');

$str = fread($fp, filesize($file));

fclose($fp);

copy($file, '0_'.$file);

$n = 1;

while($n < 10){

$code = strdecode($str);

if($n == 1){

$code = str_replace("__FILE__", "'0_$file'", $code);

}

$replace = '$decode'.$n.'=trim';

if(strpos($code, 'eval(') > 0){

$code = str_replace('eval(', $replace.'(', $code);

}else{

preg_match("/@\\$(.*)\(\\$(.*),(.*)\(/isU", $code, $res);

$code = str_replace($res[3], "'$replace", $code);

}

$code = preg_replace('/\\$(.*)=false;(.*?)\(\);/', '', $code); //上壹版本

$code = preg_replace('/\|\|@\\$(.*?)\(\);/', '|| print("ok");', $code);

$code = destr($code);

$tmp_file = 'detmp'.$n.'.php';

file_put_contents($tmp_file, $code);

include($tmp_file);

$val = 'decode'.$n;

$str = $$val;

unlink($tmp_file);

if(strpos($str, ';?>') === 0){

$decode = $str;

break;

}

$str = " $n++;

}

$decode = preg_replace("/^(.*)exit\('Access Denied'\); /", " $del = strrchr($decode, 'unset');

$decode = str_replace($del, "\r\n?>", $decode);

file_put_contents($file.'.de.php' ,$decode);

unlink('0_'.$file);

echo 'done';

////////////

function val_replace($code, $val, $deval){

$code = str_replace('$'.$val.',', '$'.$deval.',', $code);

$code = str_replace('$'.$val.';', '$'.$deval.';', $code);

$code = str_replace('$'.$val.'=', '$'.$deval.'=', $code);

$code = str_replace('$'.$val.'(', '$'.$deval.'(', $code);

$code = str_replace('$'.$val.')', '$'.$deval.')', $code);

$code = str_replace('$'.$val.'.', '$'.$deval.'.', $code);

$code = str_replace('$'.$val.'/', '$'.$deval.'/', $code);

$code = str_replace('$'.$val.'>', '$'.$deval.'>', $code);

$code = str_replace('$'.$val.'<', '$'.$deval.'<', $code);

$code = str_replace('$'.$val.'^', '$'.$deval.'^', $code);

$code = str_replace('$'.$val.'||', '$'.$deval.'||', $code);

$code = str_replace('($'.$val.' ', '($'.$deval.' ', $code);

return $code;

}

function fmt_code($code){

global $vals,$funs;

preg_match_all("/\\$[0-9a-zA-Z\[\]']+(,|;)/iesU", $code, $res);

foreach($res[0] as $v){

$val = str_replace(array('$',',',';'), '', $v);

$deval = destr($val, 1);

$vals[$val] = $deval;

$code = val_replace($code, $val, $deval);

}

preg_match_all("/\\$[0-9a-zA-Z\[\]']+=/iesU", $code, $res);

foreach($res[0] as $v){

$val = str_replace(array('$','='), '', $v);

$deval = destr($val, 1);

$vals[$val] = $deval;

$code = val_replace($code, $val, $deval);

}

preg_match_all("/function\s[0-9a-zA-Z\[\]]+\(/iesU", $code, $res);

foreach($res[0] as $v){

$val = str_replace(array('function ','('), '', $v);

$deval = destr($val, 1);

$funs[$val] = $deval;

$code = str_replace('function '.$val.'(', 'function '.$deval.'(', $code);

$code = str_replace('='.$val.'(', '='.$deval.'(', $code);

$code = str_replace('return '.$val.'(', 'return '.$deval.'(', $code);

}

return $code;

}

function strdecode($str){

$len = strlen($str);

$newstr = '';

for($i=0; $i<$len; $i++){

$n = ord($str[$i]);

$newstr .= decode($n);

}

return $newstr;

}

function decode($dec){

if(($dec > 126 || $dec<32) && $dec<>13 && $dec<>10){

return '['.$dec.']';

}else{

return chr($dec);

}

}

function destr($str, $val=0){

$k = 0;

$num = '';

$n = strlen($str);

$code = '';

for($i=0; $i<$n; $i++){

if($str[$i] == '[' && ($str[$i+1]==1 || $str[$i+1]==2)){

$k = 1;

}elseif($str[$i] == ']' && $k==1){

$num = intval($num);

if($val==1){

$num = 97 + fmod($num, 25);

}

$code .= chr($num);

$k = 0;

$num = null;

}else{

if($k == 1){

$num .= $str[$i];

}else{

$code .= $str[$i];

}

}

}

return $code;

}

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