<?PHP
###################################################################################################
## Main function for message encryption if key is 8chrs it encrypts DES, if 24chrs or more, 3DES ##
###################################################################################################


## This takes care of bit-shuffling, and enhances php to accept zero fill shift right bitwise operator >>> ## 
function zeroFill($a, $b) { 
$z = hexdec(80000000);
$z = (int)$z;
$a = (int)$a;
$b = (int)$b;
if ($z & $a) { 
 $a >>= 1; 
 $a &= (~ $z); 
 $a |= 0x40000000; 
 $a >>= ($b-1); 
} else { 
 $a >>= $b; 
} 
return $a; 
}

function TripleDES ($key, $message, $encrypt, $mode, $iv) {
  # declaring this locally speeds things up a bit
  $spfunction1 = array(0x1010400,0,0x10000,0x1010404,0x1010004,0x10404,0x4,0x10000,0x400,0x1010400,0x1010404,0x400,0x1000404,0x1010004,0x1000000,0x4,0x404,0x1000400,0x1000400,0x10400,0x10400,0x1010000,0x1010000,0x1000404,0x10004,0x1000004,0x1000004,0x10004,0,0x404,0x10404,0x1000000,0x10000,0x1010404,0x4,0x1010000,0x1010400,0x1000000,0x1000000,0x400,0x1010004,0x10000,0x10400,0x1000004,0x400,0x4,0x1000404,0x10404,0x1010404,0x10004,0x1010000,0x1000404,0x1000004,0x404,0x10404,0x1010400,0x404,0x1000400,0x1000400,0,0x10004,0x10400,0,0x1010004);
  $spfunction2 = array(0x80108020,0x80008000,0x8000,0x108020,0x100000,0x20,0x80100020,0x80008020,0x80000020,0x80108020,0x80108000,0x80000000,0x80008000,0x100000,0x20,0x80100020,0x108000,0x100020,0x80008020,0,0x80000000,0x8000,0x108020,0x80100000,0x100020,0x80000020,0,0x108000,0x8020,0x80108000,0x80100000,0x8020,0,0x108020,0x80100020,0x100000,0x80008020,0x80100000,0x80108000,0x8000,0x80100000,0x80008000,0x20,0x80108020,0x108020,0x20,0x8000,0x80000000,0x8020,0x80108000,0x100000,0x80000020,0x100020,0x80008020,0x80000020,0x100020,0x108000,0,0x80008000,0x8020,0x80000000,0x80100020,0x80108020,0x108000);
  $spfunction3 = array(0x208,0x8020200,0,0x8020008,0x8000200,0,0x20208,0x8000200,0x20008,0x8000008,0x8000008,0x20000,0x8020208,0x20008,0x8020000,0x208,0x8000000,0x8,0x8020200,0x200,0x20200,0x8020000,0x8020008,0x20208,0x8000208,0x20200,0x20000,0x8000208,0x8,0x8020208,0x200,0x8000000,0x8020200,0x8000000,0x20008,0x208,0x20000,0x8020200,0x8000200,0,0x200,0x20008,0x8020208,0x8000200,0x8000008,0x200,0,0x8020008,0x8000208,0x20000,0x8000000,0x8020208,0x8,0x20208,0x20200,0x8000008,0x8020000,0x8000208,0x208,0x8020000,0x20208,0x8,0x8020008,0x20200);
  $spfunction4 = array(0x802001,0x2081,0x2081,0x80,0x802080,0x800081,0x800001,0x2001,0,0x802000,0x802000,0x802081,0x81,0,0x800080,0x800001,0x1,0x2000,0x800000,0x802001,0x80,0x800000,0x2001,0x2080,0x800081,0x1,0x2080,0x800080,0x2000,0x802080,0x802081,0x81,0x800080,0x800001,0x802000,0x802081,0x81,0,0,0x802000,0x2080,0x800080,0x800081,0x1,0x802001,0x2081,0x2081,0x80,0x802081,0x81,0x1,0x2000,0x800001,0x2001,0x802080,0x800081,0x2001,0x2080,0x800000,0x802001,0x80,0x800000,0x2000,0x802080);
  $spfunction5 = array(0x100,0x2080100,0x2080000,0x42000100,0x80000,0x100,0x40000000,0x2080000,0x40080100,0x80000,0x2000100,0x40080100,0x42000100,0x42080000,0x80100,0x40000000,0x2000000,0x40080000,0x40080000,0,0x40000100,0x42080100,0x42080100,0x2000100,0x42080000,0x40000100,0,0x42000000,0x2080100,0x2000000,0x42000000,0x80100,0x80000,0x42000100,0x100,0x2000000,0x40000000,0x2080000,0x42000100,0x40080100,0x2000100,0x40000000,0x42080000,0x2080100,0x40080100,0x100,0x2000000,0x42080000,0x42080100,0x80100,0x42000000,0x42080100,0x2080000,0,0x40080000,0x42000000,0x80100,0x2000100,0x40000100,0x80000,0,0x40080000,0x2080100,0x40000100);
  $spfunction6 = array(0x20000010,0x20400000,0x4000,0x20404010,0x20400000,0x10,0x20404010,0x400000,0x20004000,0x404010,0x400000,0x20000010,0x400010,0x20004000,0x20000000,0x4010,0,0x400010,0x20004010,0x4000,0x404000,0x20004010,0x10,0x20400010,0x20400010,0,0x404010,0x20404000,0x4010,0x404000,0x20404000,0x20000000,0x20004000,0x10,0x20400010,0x404000,0x20404010,0x400000,0x4010,0x20000010,0x400000,0x20004000,0x20000000,0x4010,0x20000010,0x20404010,0x404000,0x20400000,0x404010,0x20404000,0,0x20400010,0x10,0x4000,0x20400000,0x404010,0x4000,0x400010,0x20004010,0,0x20404000,0x20000000,0x400010,0x20004010);
  $spfunction7 = array(0x200000,0x4200002,0x4000802,0,0x800,0x4000802,0x200802,0x4200800,0x4200802,0x200000,0,0x4000002,0x2,0x4000000,0x4200002,0x802,0x4000800,0x200802,0x200002,0x4000800,0x4000002,0x4200000,0x4200800,0x200002,0x4200000,0x800,0x802,0x4200802,0x200800,0x2,0x4000000,0x200800,0x4000000,0x200800,0x200000,0x4000802,0x4000802,0x4200002,0x4200002,0x2,0x200002,0x4000000,0x4000800,0x200000,0x4200800,0x802,0x200802,0x4200800,0x802,0x4000002,0x4200802,0x4200000,0x200800,0,0x2,0x4200802,0,0x200802,0x4200000,0x800,0x4000002,0x4000800,0x800,0x200002);
  $spfunction8 = array(0x10001040,0x1000,0x40000,0x10041040,0x10000000,0x10001040,0x40,0x10000000,0x40040,0x10040000,0x10041040,0x41000,0x10041000,0x41040,0x1000,0x40,0x10040000,0x10000040,0x10001000,0x1040,0x41000,0x40040,0x10040040,0x10041000,0x1040,0,0,0x10040040,0x10000040,0x10001000,0x41040,0x40000,0x41040,0x40000,0x10041000,0x1000,0x40,0x10040040,0x1000,0x41040,0x10001000,0x40,0x10000040,0x10040000,0x10040040,0x10000000,0x40000,0x10001040,0,0x10041040,0x40040,0x10000040,0x10040000,0x10001000,0x10001040,0,0x10041040,0x41000,0x41000,0x1040,0x1040,0x40040,0x10000000,0x10041000);

  #create the 16 or 48 subkeys we will need
  $keys = des_createKeys($key);
    $keysize = count($keys);
    $m=0;
    $i=0;
    $temp=0;
    $temp2=0;
    $right1=0;
    $right2=0;
    $left=0;
    $right=0;
    $looping=0;
    $cbcleft=0;
    $cbcleft2=0;
    $cbcright=0;
    $cbcright2=0;
    $endloop=0;
    $loopinc=0;
    $result=0;
    $tempresult=0;
  $len = strlen($message);
    $chunk = 0;
  #set up the loops for single and triple des
  $iterations = count($keys) == 32 ? 3 : 9; #single or triple des
  if ($iterations == 3) {$looping = $encrypt ? array(0, 32, 2) : array(30, -2, -2);}
  else {$looping = $encrypt ? array(0, 32, 2, 62, 30, -2, 64, 96, 2) : array(94, 62, -2, 32, 64, 2, 30, -2, -2);}

  $message .= "\0\0\0\0\0\0\0\0"; #pad the message out with null bytes
  #store the result here
  $result = "";
  $tempresult = "";

  if ($mode == 1) { #CBC mode
    $cbcleft = (ord(substr($iv,$m++,1)) << 24) | (ord(substr($iv,$m++,1)) << 16) | (ord(substr($iv,$m++,1)) << 8) | ord(substr($iv,$m++,1));
    $cbcright = (ord(substr($iv,$m++,1)) << 24) | (ord(substr($iv,$m++,1)) << 16) | (ord(substr($iv,$m++,1)) << 8) | ord(substr($iv,$m++,1));
    $m=0;
    }

  #loop through each 64 bit chunk of the message
  while ($m < $len) {
    $left = (ord(substr($message,$m++,1)) << 24) | (ord(substr($message,$m++,1)) << 16) | (ord(substr($message,$m++,1)) << 8) | ord(substr($message,$m++,1));
    $right = (ord(substr($message,$m++,1)) << 24) | (ord(substr($message,$m++,1)) << 16) | (ord(substr($message,$m++,1)) << 8) | ord(substr($message,$m++,1));
        #for Cipher Block Chaining mode, xor the message with the previous result
    if ($mode == 1) { 
            if ($encrypt) {
                $left ^= $cbcleft;
                $right ^= $cbcright;
                } else {
                $cbcleft2 = $cbcleft; 
                $cbcright2 = $cbcright; 
                $cbcleft = $left;
                $cbcright = $right;
            }
        }

    #first each 64 but chunk of the message must be permuted according to IP
    $temp = ((zeroFill($left, 4)) ^ $right) & 0x0f0f0f0f;
        $right ^= $temp; $left ^= ($temp << 4);
    $temp = ((zeroFill($left, 16)) ^ $right) & 0x0000ffff;
        $right ^= $temp; $left ^= ($temp << 16);
    $temp = ((zeroFill($right, 2)) ^ $left) & 0x33333333;
        $left ^= $temp; $right ^= ($temp << 2);
    $temp = ((zeroFill($right, 8)) ^ $left) & 0x00ff00ff;
        $left ^= $temp; $right ^= ($temp << 8);
    $temp = ((zeroFill($left, 1)) ^ $right) & 0x55555555;
        $right ^= $temp; $left ^= ($temp << 1);
        
    $left = (($left << 1) | (zeroFill($left, 31))); 
    $right = (($right << 1) | (zeroFill($right, 31))); 
        #do this either 1 or 3 times for each chunk of the message
    for ($j=0; $j<$iterations; $j+=3) {
      $endloop =$looping[$j+1];
            $loopinc =$looping[$j+2]; #now go through and perform the encryption or decryption  
      for ($i=$looping[$j]; $i!=$endloop; $i+=$loopinc) { #for efficiency
              $right1 =$right ^ $keys[$i]; 
        $right2 =((zeroFill($right, 4)) | ($right << 28)) ^ $keys[$i+1];
        #the result is attained by passing these bytes through the S selection functions
        $temp = $left;
        $left = $right;
        $right = $temp ^ ($spfunction2[(zeroFill($right1, 24)) & 0x3f] | $spfunction4[($right1 >> 16) & 0x3f]
              | $spfunction6[(zeroFill($right1, 8)) & 0x3f] | $spfunction8[$right1 & 0x3f]
              | $spfunction1[(zeroFill($right2, 24)) & 0x3f] | $spfunction3[(zeroFill($right2, 16)) & 0x3f]
              | $spfunction5[(zeroFill($right2, 8)) & 0x3f] | $spfunction7[$right2 & 0x3f]);
      }
      $temp = $left;
            $left = $right;
            $right = $temp; #unreverse left and right
        } #for either 1 or 3 iterations
        
    #move then each one bit to the right
    $left = ((zeroFill($left, 1)) | ($left << 31)); 
    $right = ((zeroFill($right, 1)) | ($right << 31)); 
        
    #now perform IP-1, which is IP in the opposite direction
    $temp = ((zeroFill($left, 1)) ^ $right) & 0x55555555; $right ^= $temp; $left ^= ($temp << 1);
    $temp = ((zeroFill($right, 8)) ^ $left) & 0x00ff00ff; $left ^= $temp; $right ^= ($temp << 8);
    $temp = ((zeroFill($right, 2)) ^ $left) & 0x33333333; $left ^= $temp; $right ^= ($temp << 2);
    $temp = ((zeroFill($left, 16)) ^ $right) & 0x0000ffff; $right ^= $temp; $left ^= ($temp << 16);
    $temp = ((zeroFill($left, 4)) ^ $right) & 0x0f0f0f0f; $right ^= $temp; $left ^= ($temp << 4);
        
    #for Cipher Block Chaining mode, xor the message with the previous result
    if ($mode == 1) {
            if ($encrypt) {
                $cbcleft = $left; 
                $cbcright = $right;
                } else {
                $left ^= $cbcleft2;
                $right ^= $cbcright2;
            }
        }
        $tempresult .= chr(zeroFill($left, 24)) . chr((zeroFill($left, 16)) & 0xff) . chr((zeroFill($left, 8)) & 0xff) . chr($left & 0xff) . chr(zeroFill($right, 24)) . chr((zeroFill($right, 16)) & 0xff) . chr((zeroFill($right, 8)) & 0xff) . chr($right & 0xff);
        $chunk += 8;
    if ($chunk == 512) {$result .= $tempresult; $tempresult = ""; $chunk = 0;}
  } #for every 8 characters, or 64 bits in the message

  #return the result as an array
  return $result . $tempresult;
} #end of des

###########################################################
## Function for creating keys for the TripleDES-function ##
###########################################################
function des_createKeys ($key) {
  # declaring this locally speeds things up a bit ##
  $pc2bytes0  = array(0,0x4,0x20000000,0x20000004,0x10000,0x10004,0x20010000,0x20010004,0x200,0x204,0x20000200,0x20000204,0x10200,0x10204,0x20010200,0x20010204);
  $pc2bytes1  = array(0,0x1,0x100000,0x100001,0x4000000,0x4000001,0x4100000,0x4100001,0x100,0x101,0x100100,0x100101,0x4000100,0x4000101,0x4100100,0x4100101);
  $pc2bytes2  = array(0,0x8,0x800,0x808,0x1000000,0x1000008,0x1000800,0x1000808,0,0x8,0x800,0x808,0x1000000,0x1000008,0x1000800,0x1000808);
  $pc2bytes3  = array(0,0x200000,0x8000000,0x8200000,0x2000,0x202000,0x8002000,0x8202000,0x20000,0x220000,0x8020000,0x8220000,0x22000,0x222000,0x8022000,0x8222000);
  $pc2bytes4  = array(0,0x40000,0x10,0x40010,0,0x40000,0x10,0x40010,0x1000,0x41000,0x1010,0x41010,0x1000,0x41000,0x1010,0x41010);
  $pc2bytes5  = array(0,0x400,0x20,0x420,0,0x400,0x20,0x420,0x2000000,0x2000400,0x2000020,0x2000420,0x2000000,0x2000400,0x2000020,0x2000420);
  $pc2bytes6  = array(0,0x10000000,0x80000,0x10080000,0x2,0x10000002,0x80002,0x10080002,0,0x10000000,0x80000,0x10080000,0x2,0x10000002,0x80002,0x10080002);
  $pc2bytes7  = array(0,0x10000,0x800,0x10800,0x20000000,0x20010000,0x20000800,0x20010800,0x20000,0x30000,0x20800,0x30800,0x20020000,0x20030000,0x20020800,0x20030800);
  $pc2bytes8  = array(0,0x40000,0,0x40000,0x2,0x40002,0x2,0x40002,0x2000000,0x2040000,0x2000000,0x2040000,0x2000002,0x2040002,0x2000002,0x2040002);
  $pc2bytes9  = array(0,0x10000000,0x8,0x10000008,0,0x10000000,0x8,0x10000008,0x400,0x10000400,0x408,0x10000408,0x400,0x10000400,0x408,0x10000408);
  $pc2bytes10 = array(0,0x20,0,0x20,0x100000,0x100020,0x100000,0x100020,0x2000,0x2020,0x2000,0x2020,0x102000,0x102020,0x102000,0x102020);
  $pc2bytes11 = array(0,0x1000000,0x200,0x1000200,0x200000,0x1200000,0x200200,0x1200200,0x4000000,0x5000000,0x4000200,0x5000200,0x4200000,0x5200000,0x4200200,0x5200200);
  $pc2bytes12 = array(0,0x1000,0x8000000,0x8001000,0x80000,0x81000,0x8080000,0x8081000,0x10,0x1010,0x8000010,0x8001010,0x80010,0x81010,0x8080010,0x8081010);
  $pc2bytes13 = array(0,0x4,0x100,0x104,0,0x4,0x100,0x104,0x1,0x5,0x101,0x105,0x1,0x5,0x101,0x105);
  # how many iterations (1 for des, 3 for triple des) ##
  $iterations = strlen($key) >= 24 ? 3 : 1;
    # creates the php eq of the array to hold the keys for return ##
    $keynum = (32 * $iterations);
    $keystr = "";
    for($e=0;$e<$keynum;$e++) {
    $keystr .= $e.",";
    }
    $keystr = substr("$keystr", 0, -1);
    $keys = array_keys(explode(",", $keystr));
    # now define the left shifts which need to be done ##
    $shifts = array(0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0);
    $m=0;
    $n=0;
    $left=0;
    $right=0;
    for ($j=0; $j<$iterations; $j++) { #either 1 or 3 iterations
        ## Pilfer the ascii-values using ord() ##
        $left =(ord(substr($key,$m++,1)) << 24) | (ord(substr($key,$m++,1)) << 16) | (ord(substr($key,$m++,1)) << 8) | ord(substr($key,$m++,1));
    $right = (ord(substr($key,$m++,1)) << 24) | (ord(substr($key,$m++,1)) << 16) | (ord(substr($key,$m++,1)) << 8) | ord(substr($key,$m++,1));
        ## The zerofill() function enhances php to accept zero fill shift right bitwise operator (>>>) ##
         $temp = ((zeroFill($left, 4)) ^  $right) & 0x0f0f0f0f; $right ^= $temp; $left  ^= ($temp << 4);
    $temp = ((zeroFill($right, -16)) ^ $left) & 0x0000ffff; $left ^=  $temp; $right ^= ($temp << -16);
    $temp = ((zeroFill($left, 2)) ^  $right) & 0x33333333; $right ^= $temp; $left  ^= ($temp << 2);
    $temp = ((zeroFill($right, -16)) ^ $left) & 0x0000ffff; $left ^=  $temp; $right ^= ($temp << 16);
    $temp = ((zeroFill($left, 1)) ^  $right) & 0x55555555; $right ^= $temp; $left  ^= ($temp << 1);
    $temp = ((zeroFill($right, 8)) ^  $left) & 0x00ff00ff; $left ^=  $temp; $right ^= ($temp << 8);
    $temp = ((zeroFill($left, 1)) ^  $right) & 0x55555555; $right ^= $temp; $left  ^= ($temp << 1);
        #the right side needs to be shifted and to get the last four bits of the left side
    $temp = ($left << 8) | ((zeroFill($right, 20)) & 0x000000f0);
        
    #left needs to be put upside down
    $left = ($right << 24) | (($right << 8) & 0xff0000) | ((zeroFill($right, 8)) & (int)0xff00) | ((zeroFill($right, 24)) & 0xf0);
        $right = $temp;
      #now go through and perform these shifts on the left and right keys
         for ($i=0; $i < sizeof($shifts); $i++) {
          #shift the keys either one or two bits to the left
      if ($shifts[$i]) {
              $left = ($left << 2) | (zeroFill($left, 26)); 
        $right = ($right << 2) | (zeroFill($right, 26));
                } else {
                 $left = ($left << 1) | (zeroFill($left, 27)); 
        $right = ($right << 1) | (zeroFill($right, 27));
            }
      $left &= 0xfffffff0;
            $right &= 0xfffffff0;
            
      #now apply PC-2, in such a way that E is easier when encrypting or decrypting
      #this conversion will look like PC-2 except only the last 6 bits of each byte are used
      #rather than 48 consecutive bits and the order of lines will be according to 
      #how the S selection functions will be applied: S2, S4, S6, S8, S1, S3, S5, S7
      $lefttemp = $pc2bytes0[zeroFill($left, 28)] | $pc2bytes1[(zeroFill($left, 24)) & 0xf] | $pc2bytes2[(zeroFill($left, 20)) & 0xf] | $pc2bytes3[(zeroFill($left, 16)) & 0xf] | $pc2bytes4[(zeroFill($left, 12)) & 0xf] | $pc2bytes5[(zeroFill($left, 8)) & 0xf] | $pc2bytes6[(zeroFill($left, 4)) & (int)0xf];
      $righttemp = $pc2bytes7[zeroFill($right, 28)] | $pc2bytes8[(zeroFill($right, 24)) & 0xf] | $pc2bytes9[(zeroFill($right, 20)) & 0xf] | $pc2bytes10[(zeroFill($right, 16)) & 0xf] | $pc2bytes11[(zeroFill($right, 12)) & 0xf] | $pc2bytes12[(zeroFill($right, 8)) & 0xf] | $pc2bytes13[(zeroFill($right, 4)) & 0xf];
         $temp = ((zeroFill($righttemp, 16)) ^ $lefttemp) & 0x0000ffff; 
      $keys[$n++] = $lefttemp ^ $temp; 
            
            $keys[$n++] = $righttemp ^ ($temp << 16);
        }
    } #for each iterations
  #return the keys we've created
    return $keys;
 
} #end of des_createKeys

#################################################
## Function for making hex out of the bin-gore ##
#################################################
function printHex ($s) {
  $r = "0x";
    $num = count($s);
  $hexes= array("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f");
  for ($i=0; $i<strlen($s); $i++) {
    $r.=$hexes[ord(substr($s,$i,1)) >> 4] . $hexes[ord(substr($s,$i,1)) & 0xf];
    }
  return $r;
}

############################################
## Coverts the submit hash to binary data ##
############################################
function hexToString ($h) {
  $r = "";
  for ($i= (substr($h,0, 2)== "0x") ? 2 : 0; $i<strlen($h); $i+=2) {
    $r .= chr(base_convert(substr($h, $i, 2), 16, 10));
    }
  return $r;
}

?>