ANTICHAT — форум по информационной безопасности, OSINT и технологиям

<?php

function changedatain($plain_data,$key){

   // encode plain data with key using xoft encryption
   
   $key_length=0; //key length counter 
   $all_bin_chars="";
   $cipher_data="";


   for($i=0;$i<strlen($plain_data);$i++){
$p=substr($plain_data,$i,1);   // p = plaintext
$k=substr($key,$key_length,1); // k = key
$key_length++;


if($key_length>=strlen($key)){
$key_length=0;
}

$dec_chars=ord($p)^ord($k);

$dec_chars=$dec_chars + strlen($key);

$bin_chars=decbin($dec_chars);

while(strlen($bin_chars)<8){
$bin_chars="0".$bin_chars;
}

$all_bin_chars=$all_bin_chars.$bin_chars;


   }

   $m=0;

   for($j=0;$j<strlen($all_bin_chars);$j=$j+4){
$four_bit=substr($all_bin_chars,$j,4);     // split 8 bit to 4 bit

$four_bit_dec=bindec($four_bit);

$decimal_value=$four_bit_dec * 4 + $m;     //multiply by 4 plus m where m=0,1,2, or 3

$base64_value=dectobase64($decimal_value); //convert to base64 value

$cipher_data=$cipher_data.$base64_value;
$m++;

if($m>3){
$m=0;
}
   }
   
   return $cipher_data;
}


function dectobase64($decimal_value){

   // convert decimal value into base64 value 

   switch($decimal_value){
case 0: $base64_value="A";break;
case 1: $base64_value="B";break;
case 2: $base64_value="C";break;
case 3: $base64_value="D";break;
case 4: $base64_value="E";break;
case 5: $base64_value="F";break;
case 6: $base64_value="G";break;
case 7: $base64_value="H";break;
case 8: $base64_value="I";break;
case 9: $base64_value="J";break;
case 10: $base64_value="K";break;
case 11: $base64_value="L";break;
case 12: $base64_value="M";break;
case 13: $base64_value="N";break;
case 14: $base64_value="O";break;
case 15: $base64_value="P";break;
case 16: $base64_value="Q";break;
case 17: $base64_value="R";break;
case 18: $base64_value="S";break;
case 19: $base64_value="T";break;
case 20: $base64_value="U";break;
case 21: $base64_value="V";break;
case 22: $base64_value="W";break;
case 23: $base64_value="X";break;
case 24: $base64_value="Y";break;
case 25: $base64_value="Z";break;
case 26: $base64_value="a";break;
case 27: $base64_value="b";break;
case 28: $base64_value="c";break;
case 29: $base64_value="d";break;
case 30: $base64_value="e";break;
case 31: $base64_value="f";break;
case 32: $base64_value="g";break;
case 33: $base64_value="h";break;
case 34: $base64_value="i";break;
case 35: $base64_value="j";break;
case 36: $base64_value="k";break;
case 37: $base64_value="l";break;
case 38: $base64_value="m";break;
case 39: $base64_value="n";break;
case 40: $base64_value="o";break;
case 41: $base64_value="p";break;
case 42: $base64_value="q";break;
case 43: $base64_value="r";break;
case 44: $base64_value="s";break;
case 45: $base64_value="t";break;
case 46: $base64_value="u";break;
case 47: $base64_value="v";break;
case 48: $base64_value="w";break;
case 49: $base64_value="x";break;
case 50: $base64_value="y";break;
case 51: $base64_value="z";break;
case 52: $base64_value="0";break;
case 53: $base64_value="1";break;
case 54: $base64_value="2";break;
case 55: $base64_value="3";break;
case 56: $base64_value="4";break;
case 57: $base64_value="5";break;
case 58: $base64_value="6";break;
case 59: $base64_value="7";break;
case 60: $base64_value="8";break;
case 61: $base64_value="9";break;
case 62: $base64_value="+";break;
case 63: $base64_value="/";break;
case 64: $base64_value="=";break;
default: $base64_value="a";break;
   }
   
   return $base64_value;
}


function base64todec($decimal_value){
$base64_value=97;

if ((ord($decimal_value) > 64) && (ord($decimal_value) < 91)) $base64_value=ord($decimal_value)-65;
if ((ord($decimal_value) > 96) && (ord($decimal_value) < 123)) $base64_value=ord($decimal_value)-71;
if ((ord($decimal_value) > 47) && (ord($decimal_value) < 58)) $base64_value=ord($decimal_value)+4;

if ($decimal_value == "+") $base64_value=62;
if ($decimal_value == "/") $base64_value=63;
if ($decimal_value == "=") $base64_value=64;
return $base64_value;
}


function decr($plain_data,$key) {
$m = 0;
$bin = "";
$result = "";
for($i=0;$i<strlen($plain_data);$i++){
	$p=substr($plain_data,$i,1);
	$c=base64todec ($p);
	$c=($c-$m)/4;
	$m++;
	if ($m>3) $m=0;

	$b = decbin($c);
	while(strlen($b)<4) $b="0".$b;
	$bin .= $b;
}
$m = 0;
for($j=0;$j<strlen($bin);$j=$j+8){
	$bit_8=substr($bin,$j,8);
	$c = bindec($bit_8) - strlen($key);
	$k=substr($key,$m,1); // k = key
	$m++;
	if ($m==strlen($key)) $m=0;
	$res=($c^ord($k));
	$result .= chr($res);
}
return $result;
}

/*echo 
echo changedatain("56435168",changeme)."<br>";
echo decr("U5abU1aXUpWzYNaX",changeme);

//4613213468735121354
*/
$f = file ("nums.txt");
foreach ($f as $c) {
	echo decr(trim($c),changeme)."<br>";
}

?>