127 lines
3.9 KiB
PHP
127 lines
3.9 KiB
PHP
<?php
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// Wiem, ze ten kod to czysta ohyda. Coz.
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require("ic-encrypt.php");
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function getImages() {
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$lines = split("\n",file_get_contents($config["imgcaptcha_list"]));
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for($i=0;$i<count($lines);$i++) { $lines[$i] = split(",",$lines[$i]); }
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return $lines;
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}
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function getIPath($img) {
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return $config["imgcaptcha_images"] . "/" . $img;
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}
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function pickImage($lines) {
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$src = FALSE;
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while($src == FALSE) {
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$pick = rand(0,count($lines)-1);
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$src = imagecreatefrompng(getIPath($lines[$pick][0]));
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}
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imagedestroy($src);
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return $pick;
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}
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function ncfix($a) {
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if($a>255) { return 255; }
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if($a<0) { return 0; }
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return $a;
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}
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function randString($length, $charset='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+=')
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{
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$str = '';
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$count = strlen($charset);
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while ($length--) {
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$str .= $charset[rand(0, $count-1)];
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}
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return $str;
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}
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function generateCaptchaHash() {
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$lines = getImages();
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$pick = pickImage($lines);
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$enctext = $pick . ",," . time() . ",," . $_SERVER["REMOTE_ADDR"] . ",," . randString(12);
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$converter = new Encryption;
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return $converter->encode($enctext);
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}
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function ic_verifyHash($enctext, $output) {
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//print "VERIFY: " . $enctext . " " . $output . "<br>";
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$converter = new Encryption;
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$dectext = split(",,",$converter->decode($enctext));
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if(count($dectext)<4) return true;
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$lines = getImages();
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$pick = $dectext[0];
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$time = time()-$dectext[1];
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if($time>$config["imgcaptcha_time_limit"]) return true;
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$lp = $lines[$pick];
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for($i=1;$i<count($lp);$i++) {
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if(strcasecmp($lp[$i],$output)==0) return false;
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}
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return true;
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}
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function getPick($enctext)
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{
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$converter = new Encryption;
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$dectext = split(",,",$converter->decode($enctext));
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if(count($dectext)<=1) return; //SC
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$lines = getImages();
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return $dectext[0];
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}
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function generateImage($enctext)
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{
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$lines = getImages();
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$pick = getPick($enctext);
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if(!isset($lines[$pick])) return; //SC
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$src = imagecreatefrompng(getIPath($lines[$pick][0]));
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if($src == FALSE) return; //SC
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$maxc = 8;
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$icw = $config["imgcaptcha_width"];
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$ich = $config["imgcaptcha_height"];
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$dst = imagecreatetruecolor($icw,$ich);
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$srcxm = imagesx($src)-$icw;
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$srcym = imagesy($src)-$ich;
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$srcx = rand(0,$srcxm-1);
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$srcy = rand(0,$srcym-1);
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imagecopy($dst,$src,0,0,$srcx,$srcy,$icw,$ich);
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// Obfuscation step 1
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imagecopymergegray($dst,$dst,0,0,0,0,$icw,$ich,rand(20,45));
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// Obfuscation step 1.5
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for($i=0;$i<8;$i++) {
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$w = rand(5,10); $h = rand(5,10);
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$x = rand(0,$icw-1-$w); $y = rand(0,$ich-1-$h);
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$x2 = rand(0,$icw-1); $y2 = rand(0,$ich-1);
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imagefilledrectangle($dst,$x,$y,$x+$w,$y+$h,imagecolorat($dst,$x2,$y2));
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}
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for($i=0;$i<5;$i++) {
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$w = rand(20,40); $h = rand(20,40);
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$x = rand(0,$icw-1-$w); $y = rand(0,$ich-1-$h);
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imagecopymergegray($dst,$dst,$x,$y,$x,$y,$w,$h,0);
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}
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// Obfuscation step 2
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for($i=0;$i<$icw*$ich;$i++) {
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$x = $i%$icw; $y = $i/$icw;
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$c = imagecolorat($dst,$x,$y);
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if(rand(0,4) == 2) { $nc = $c ^ rand(0,16777215); }
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else { $nc = imagecolorat($dst,rand(0,$icw-1),rand(0,$ich-1)); }
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if(rand(18,24)!=21 and $c != 0 and $c != 0xFF00FF)
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{
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$nc = ncfix(($c&0xFF) + rand(-16,16)) | ncfix((($c>>8)&0xFF) + rand(-8,8))<<8 | ncfix((($c>>16)&0xFF) + rand(-32,32))<<16;
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$nc1 = $nc&0xFF ^ ($nc>>8)&0xFF ^ ($nc>>16)&0xFF;
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} else {
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$nc1 = $nc&0xFF;
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if($nc1>($maxc*25)) $nc1 = $nc % ($maxc*25);
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}
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$nc2 = $nc1 | $nc1<<8 | $nc1<<16;
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if(rand(0,1)==0) $nc2=$nc;
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imagesetpixel($dst,$x,$y,$nc2);
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}
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// Obfuscation step 3
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for($i=0;$i<rand(10,30);$i++) {
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$x1 = rand(0,$icw-1); $x2 = rand(0,$icw-1); $y1 = rand(0,$ich-1); $y2 = rand(0,$ich-1);
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$color = imagecolorallocate($dst, rand(0,$maxc)*25, rand(0,$maxc)*25, rand(0,$maxc)*25);
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imageline($dst,$x1,$y1,$x2,$y2,$color);
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}
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imagepng($dst);
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}
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//header('Content-Type: image/png');
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//$t = generateCaptchaHash();
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//generateImage($t);
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?>
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