asiekierka
12 years ago
4 changed files with 170 additions and 1 deletions
@ -0,0 +1,39 @@ |
|||
<?php |
|||
// Z internetow. |
|||
class Encryption { |
|||
var $skey = $config["imgcaptcha_key"]; |
|||
|
|||
public function safe_b64encode($string) { |
|||
$data = base64_encode($string); |
|||
$data = str_replace(array('+','/','='),array('-','_',''),$data); |
|||
return $data; |
|||
} |
|||
|
|||
public function safe_b64decode($string) { |
|||
$data = str_replace(array('-','_'),array('+','/'),$string); |
|||
$mod4 = strlen($data) % 4; |
|||
if ($mod4) { |
|||
$data .= substr('====', $mod4); |
|||
} |
|||
return base64_decode($data); |
|||
} |
|||
|
|||
public function encode($value){ |
|||
if(!$value){return false;} |
|||
$text = $value; |
|||
$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB); |
|||
$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND); |
|||
$crypttext = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $this->skey, $text, MCRYPT_MODE_ECB, $iv); |
|||
return trim($this->safe_b64encode($crypttext)); |
|||
} |
|||
|
|||
public function decode($value){ |
|||
if(!$value){return false;} |
|||
$crypttext = $this->safe_b64decode($value); |
|||
$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB); |
|||
$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND); |
|||
$decrypttext = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $this->skey, $crypttext, MCRYPT_MODE_ECB, $iv); |
|||
return trim($decrypttext); |
|||
} |
|||
} |
|||
?> |
|||
@ -0,0 +1,126 @@ |
|||
<?php |
|||
// Wiem, ze ten kod to czysta ohyda. Coz. |
|||
require("ic-encrypt.php"); |
|||
function getImages() { |
|||
$lines = split("\n",file_get_contents($config["imgcaptcha_list"])); |
|||
for($i=0;$i<count($lines);$i++) { $lines[$i] = split(",",$lines[$i]); } |
|||
return $lines; |
|||
} |
|||
function getIPath($img) { |
|||
return $config["imgcaptcha_images"] . "/" . $img; |
|||
} |
|||
function pickImage($lines) { |
|||
$src = FALSE; |
|||
while($src == FALSE) { |
|||
$pick = rand(0,count($lines)-1); |
|||
$src = imagecreatefrompng(getIPath($lines[$pick][0])); |
|||
} |
|||
imagedestroy($src); |
|||
return $pick; |
|||
} |
|||
function ncfix($a) { |
|||
if($a>255) { return 255; } |
|||
if($a<0) { return 0; } |
|||
return $a; |
|||
} |
|||
function randString($length, $charset='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+=') |
|||
{ |
|||
$str = ''; |
|||
$count = strlen($charset); |
|||
while ($length--) { |
|||
$str .= $charset[rand(0, $count-1)]; |
|||
} |
|||
return $str; |
|||
} |
|||
function generateCaptchaHash() { |
|||
$lines = getImages(); |
|||
$pick = pickImage($lines); |
|||
$enctext = $pick . ",," . time() . ",," . $_SERVER["REMOTE_ADDR"] . ",," . randString(12); |
|||
$converter = new Encryption; |
|||
return $converter->encode($enctext); |
|||
} |
|||
function ac_verifyHash($enctext, $output) { |
|||
//print "VERIFY: " . $enctext . " " . $output . "<br>"; |
|||
$converter = new Encryption; |
|||
$dectext = split(",,",$converter->decode($enctext)); |
|||
if(count($dectext)<4) return true; |
|||
$lines = getImages(); |
|||
$pick = $dectext[0]; |
|||
$time = time()-$dectext[1]; |
|||
if($time>$config["imgcaptcha_time_limit"]) return true; |
|||
$lp = $lines[$pick]; |
|||
for($i=1;$i<count($lp);$i++) { |
|||
if(strcasecmp($lp[$i],$output)==0) return false; |
|||
} |
|||
return true; |
|||
} |
|||
function getPick($enctext) |
|||
{ |
|||
$converter = new Encryption; |
|||
$dectext = split(",,",$converter->decode($enctext)); |
|||
if(count($dectext)<=1) return; //SC |
|||
$lines = getImages(); |
|||
return $dectext[0]; |
|||
} |
|||
function generateImage($enctext) |
|||
{ |
|||
$lines = getImages(); |
|||
$pick = getPick($enctext); |
|||
if(!isset($lines[$pick])) return; //SC |
|||
$src = imagecreatefrompng(getIPath($lines[$pick][0])); |
|||
if($src == FALSE) return; //SC |
|||
$maxc = 8; |
|||
$icw = $config["imgcaptcha_width"]; |
|||
$ich = $config["imgcaptcha_height"]; |
|||
$dst = imagecreatetruecolor($icw,$ich); |
|||
$srcxm = imagesx($src)-$icw; |
|||
$srcym = imagesy($src)-$ich; |
|||
$srcx = rand(0,$srcxm-1); |
|||
$srcy = rand(0,$srcym-1); |
|||
imagecopy($dst,$src,0,0,$srcx,$srcy,$icw,$ich); |
|||
|
|||
// Obfuscation step 1 |
|||
imagecopymergegray($dst,$dst,0,0,0,0,$icw,$ich,rand(20,45)); |
|||
// Obfuscation step 1.5 |
|||
for($i=0;$i<8;$i++) { |
|||
$w = rand(5,10); $h = rand(5,10); |
|||
$x = rand(0,$icw-1-$w); $y = rand(0,$ich-1-$h); |
|||
$x2 = rand(0,$icw-1); $y2 = rand(0,$ich-1); |
|||
imagefilledrectangle($dst,$x,$y,$x+$w,$y+$h,imagecolorat($dst,$x2,$y2)); |
|||
} |
|||
for($i=0;$i<5;$i++) { |
|||
$w = rand(20,40); $h = rand(20,40); |
|||
$x = rand(0,$icw-1-$w); $y = rand(0,$ich-1-$h); |
|||
imagecopymergegray($dst,$dst,$x,$y,$x,$y,$w,$h,0); |
|||
} |
|||
// Obfuscation step 2 |
|||
for($i=0;$i<$icw*$ich;$i++) { |
|||
$x = $i%$icw; $y = $i/$icw; |
|||
$c = imagecolorat($dst,$x,$y); |
|||
if(rand(0,4) == 2) { $nc = $c ^ rand(0,16777215); } |
|||
else { $nc = imagecolorat($dst,rand(0,$icw-1),rand(0,$ich-1)); } |
|||
if(rand(18,24)!=21 and $c != 0 and $c != 0xFF00FF) |
|||
{ |
|||
$nc = ncfix(($c&0xFF) + rand(-16,16)) | ncfix((($c>>8)&0xFF) + rand(-8,8))<<8 | ncfix((($c>>16)&0xFF) + rand(-32,32))<<16; |
|||
$nc1 = $nc&0xFF ^ ($nc>>8)&0xFF ^ ($nc>>16)&0xFF; |
|||
} else { |
|||
$nc1 = $nc&0xFF; |
|||
if($nc1>($maxc*25)) $nc1 = $nc % ($maxc*25); |
|||
} |
|||
$nc2 = $nc1 | $nc1<<8 | $nc1<<16; |
|||
if(rand(0,1)==0) $nc2=$nc; |
|||
imagesetpixel($dst,$x,$y,$nc2); |
|||
} |
|||
// Obfuscation step 3 |
|||
for($i=0;$i<rand(10,30);$i++) { |
|||
$x1 = rand(0,$icw-1); $x2 = rand(0,$icw-1); $y1 = rand(0,$ich-1); $y2 = rand(0,$ich-1); |
|||
$color = imagecolorallocate($dst, rand(0,$maxc)*25, rand(0,$maxc)*25, rand(0,$maxc)*25); |
|||
imageline($dst,$x1,$y1,$x2,$y2,$color); |
|||
} |
|||
|
|||
imagepng($dst); |
|||
} |
|||
//header('Content-Type: image/png'); |
|||
//$t = generateCaptchaHash(); |
|||
//generateImage($t); |
|||
?> |
|||
Loading…
Reference in new issue