'."\n");
}
else
header("Content-type: text/html");
#
##############################
?>
PNGCrypt <?php echo($version); ?>
");
for($y = 0; $y < $x_max; $y++) {
for($x = 0; $x < $y_max; $x++) {
$chr = dechex(imagecolorat($img, $x, $y));
$chr = str_split($chr, 2);
for($i = 0; $i <= 2; $i++) {
if(hexdec($chr[$i]) != 0) {
$chr[$i] = chr(hexdec($chr[$i]));
$text .= $chr[$i];
}
else {
break 2;
}
}
}
}
echo(vigenere_decrypt_ascii($text, $key, TRUE));
echo("");
imagedestroy($img);
}
#
###################
###################
# text2picture
function text2picture($text, $key = "default") {
$text = vigenere_crypt_ascii(str_replace("\r", "", $_POST['text']), $key, TRUE).chr(0);
$dimensions = ceil(sqrt((strlen($text) / 3)));
$img = imagecreatetruecolor($dimensions, $dimensions);
$random = FALSE;
$pos = 0;
for($y = 0; $y < $dimensions; $y++) {
for($x = 0; $x < $dimensions; $x++) {
for($i = 0; $i <= 2; $i++) {
if(ord($text[($pos + $i)]) == 0) {
if($random) {
if(rand(0, 1))
$text[($pos + $i)] = chr(rand(97, 102));
else
$text[($pos + $i)] = chr(rand(48, 57));
}
else
$random = TRUE;
}
}
$color = imagecolorallocate($img, ord($text[$pos]), ord($text[($pos + 1)]), ord($text[($pos + 2)]));
$pos += 3;
imagesetpixel($img, $x, $y, $color);
}
}
header("Content-type: image/png");
header('Content-Disposition: attachment; filename="encoded_image.png"');
#imagepng($img, "img.png");
imagepng($img);
imagedestroy($img);
}
#
###################
###################
# whole ascii chart vigenere encryption
function vigenere_crypt_ascii($text, $key, $hex = FALSE) {
$key = vigenere_expand_key(strlen($text), $key);
for ($i = 0; $i < strlen($text); $i++) {
$ascii_text[$i] = ord($text[$i]);
$ascii_key[$i] = ord($key[$i]);
$ascii_crypt[$i] = $ascii_text[$i] + $ascii_key[$i];
if ($ascii_crypt[$i] > 255)
$ascii_crypt[$i] -= 256;
if ($hex == TRUE AND strlen(dechex($ascii_crypt[$i])) == 1)
$text_crypt .= "0".dechex($ascii_crypt[$i]);
elseif ($hex == TRUE)
$text_crypt .= dechex($ascii_crypt[$i]);
else
$text_crypt .= chr($ascii_crypt[$i]);
}
return $text_crypt;
}
#
###################
###################
# whole ascii chart vigenere decryption
function vigenere_decrypt_ascii($crypt, $key, $hex = FALSE) {
if ($hex == TRUE) {
$crypt = str_split($crypt, 2);
$len = count($crypt);
}
else
$len = strlen($crypt);
$key = vigenere_expand_key($len, $key);
for ($i = 0; $i < $len; $i++) {
if ($hex == TRUE)
$ascii_crypt[$i] = hexdec($crypt[$i]);
else
$ascii_crypt[$i] = ord($crypt[$i]);
$ascii_key[$i] = ord($key[$i]);
$ascii_text[$i] = $ascii_crypt[$i] - $ascii_key[$i];
if ($ascii_text[$i] < 0)
$ascii_text[$i] += 256;
$text_decrypt .= chr($ascii_text[$i]);
}
return $text_decrypt;
}
#
###################
###################
# vigenere key adjustment
function vigenere_expand_key($len, $key) {
if (strlen($key) >= $len OR strlen($key) < 1)
return $key;
else
return vigenere_expand_key($len, $key.$key);
}
#
###################
?>