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decrypt.php
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decrypt.php
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<?php
ini_set('max_execution_time', -1);
define('MODE', MCRYPT_MODE_CBC);
$cipherFile = file_get_contents("Cipher.json");
$cipherJson = json_decode($cipherFile, true);
$cipher = base64_decode($cipherJson["Ciphertext"]);
$iv = base64_decode($cipherJson["iv"]);
$hash = $cipherJson["hash"];
$needle = "lol ";
$initKey = $argv[1];
$iterations = $argv[2];
$guessArray = array();
if (strlen($initKey) != 16) {
die("init key is niet de goede lengte");
}
$initKeyArray = str_split($initKey);
for ($i = 0; $i < 16; $i++) {
$guessArray[] = reverseLookup($initKeyArray[$i]);
}
//echo implode($guessArray, ", ");
$result = "";
for ($i = 0; $i < $iterations; $i++) {
$guess = pack('H*', implode(keyMaker($guessArray)));
$plaintext = mcrypt_decrypt(MCRYPT_DES, $guess, $cipher, MODE, $iv);
//echo implode(keyMaker($guessArray))."\n";
if (strstr($plaintext, $needle)) {
$result = array();
$result["key"] = implode(keyMaker($guessArray));
$result["plainText"] = $plaintext;
$result["hashCheck"] = (md5(trim($plaintext)) == $hash);
$result["hash"] = md5(trim($plaintext));
// file_put_contents("result.json", str_replace('\u0000', "", json_encode($result)));
die("found it" . str_replace('\u0000', "", json_encode($result)));
break;
}
$guessArray = updateKey($guessArray);
}
//file_put_contents("result.json", "{\"result\": \"no\"}");
die("didnt find");
function keyMaker($keyArray)
{
$key = array();
for ($i = 0; $i < 16; $i++) {
switch ($keyArray[$i]) {
case 10:
$key[$i] = "A";
break;
case 11:
$key[$i] = "B";
break;
case 12:
$key[$i] = "C";
break;
case 13:
$key[$i] = "D";
break;
case 14:
$key[$i] = "E";
break;
case 15:
$key[$i] = "F";
break;
default:
$key[$i] = $keyArray[$i];
break;
}
}
return $key;
}
function updateKey($keyArray)
{
$keyArray[15]++;
for ($i = 15; $i != 0; $i--) {
if ($keyArray[$i] == 16) {
$keyArray[$i - 1]++;
$keyArray[$i] = 0;
}
//echo $keyArray[$i];
}
return $keyArray;
}
function reverseLookup($letter)
{
switch ($letter) {
case "A":
return 10;
break;
case "B":
return 11;
break;
case "C":
return 12;
break;
case "D":
return 13;
break;
case "E":
return 14;
break;
case "F":
return 15;
break;
default:
return $letter;
break;
}
}