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420 florian 1
<?php
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require_once(realpath(dirname(__FILE__) . '/') . '/secret/wp-hashcash.lib');
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header("Pragma: no-cache");
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header("Expires: 0");
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header("Cache-Control: no-store, no-cache, must-revalidate");
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header("Cache-Control: post-check=0, pre-check=0", false);
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$expired = array();
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$function_name = hashcash_random_string(rand(6,18));
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$expired [] = $function_name;
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$js = "function $function_name (){";
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$type = rand(0, 3) * 0;
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switch($type){
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	/* Addition of n times of field value / n, + modulus:
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	Time guarantee:  100 iterations or less */
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	case 0:
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		$eax = hashcash_random_string(rand(8,10), $expired);
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		$expired [] = $eax;
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		$val = hashcash_field_value();
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		$inc = rand($val / 100, $val - 1);
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		$n = floor($val / $inc);
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		$r = $val % $inc;
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		$js .= "var $eax = $inc; ";
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		for($i = 0; $i < $n - 1; $i++){
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			$js .= "$eax += $inc; ";
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		}
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		$js .= "$eax += $r; ";
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		$js .= "return $eax; ";
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	break;
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	/* Conversion from binary:
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	Time guarantee:  log(n) iterations or less */
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	case 1:
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		$eax = hashcash_random_string(rand(8,10), $expired);
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		$expired [] = $eax;
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		$ebx = hashcash_random_string(rand(8,10), $expired);
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		$expired [] = $ebx;
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		$ecx = hashcash_random_string(rand(8,10), $expired);
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		$expired [] = $ecx;
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		$val = hashcash_field_value();
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		$binval = strrev(base_convert($val, 10, 2));
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			$js .= "var $eax = \"$binval\"; ";
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		$js .= "var $ebx = 0; ";
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		$js .= "var $ecx = 0; ";
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		$js .= "while($ecx < $eax.length){ ";
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		$js .= "if($eax.charAt($ecx) == \"1\") { ";
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		$js .= "$ebx += Math.pow(2, $ecx); ";
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		$js .= "} ";
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		$js .= "$ecx++; ";
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		$js .= "} ";
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		$js .= "return $ebx; ";
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	break;
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	/* Multiplication of square roots:
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	Time guarantee:  constant time */
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	case 2:
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		$val = hashcash_field_value();
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		$sqrt = floor(sqrt($val));
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		$r = $val - ($sqrt * $sqrt);
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		$js .= "return $sqrt * $sqrt + $r; ";
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	break;
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	/* Sum of random numbers to the final value:
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	Time guarantee:  log(n) expected value */
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	case 3:
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		$val = hashcash_field_value();
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		$js .= "return ";
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		$i = 0;
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		while($val > 0){
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			if($i++ > 0)
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				$js .= "+";
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			$temp = rand(1, $val);
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			$val -= $temp;
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			$js .= $temp;
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		}
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		$js .= ";";
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	break;
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}
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$js .= "} $function_name ();";
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// pack bytes
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function strToLongs($s) {
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	$l = array();
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	// pad $s to some multiple of 4
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	$s = preg_split('//', $s, -1, PREG_SPLIT_NO_EMPTY);
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	while(count($s) % 4 != 0){
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		$s [] = ' ';
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	}
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	for ($i = 0; $i < ceil(count($s)/4); $i++) {
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		$l[$i] = ord($s[$i*4]) + (ord($s[$i*4+1]) << 8) + (ord($s[$i*4+2]) << 16) + (ord($s[$i*4+3]) << 24);
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    	}
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	return $l;
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}
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// xor all the bytes with a random key
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$key = rand(21474836, 2126008810);
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$js = strToLongs($js);
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for($i = 0; $i < count($js); $i++){
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	$js[$i] = $js[$i] ^ $key;
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}
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// libs function encapsulation
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$libs_name = hashcash_random_string(rand(6,18), $expired);
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$expired [] = $libs_name;
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$libs = "function $libs_name(){";
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// write bytes to javascript, xor with key
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$data_name = hashcash_random_string(rand(6,18), $expired);
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$expired [] = $data_name;
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$libs .= "var $data_name = new Array(" . count($js) . "); ";
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for($i = 0; $i < count($js); $i++){
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	$libs .= $data_name . '[' . $i . '] = ' . $js[$i] . ' ^ ' . $key .'; ';
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}
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// convert bytes back to string
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$libs .= " var a = new Array($data_name.length); ";
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$libs .= "for (var i=0; i<" . $data_name . ".length; i++) { ";
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$libs .= 'a[i] = String.fromCharCode(' . $data_name .'[i] & 0xFF, ' . $data_name . '[i]>>>8 & 0xFF, ';
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$libs .= $data_name . '[i]>>>16 & 0xFF, ' . $data_name . '[i]>>>24 & 0xFF); } ';
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$libs .= "return eval(a.join('')); ";
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// call libs function
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$libs .= "} $libs_name();";
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// return code
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echo $libs;
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?>