PHP Encryption & Decryption problems

[kle_3187]

Hi all,

 

This is the first time ive ever done PHP and am really finding it tough! 

 

Basically for my uni cw I have to encrypt a string on the client side and send it to the server to be decrypted.

 

In order to do this I made an array and then icremented each ASCII value by 5.  Then I imploded this to a string in order to send it to the server but when I try to decrypt its not reading in the encrypted string value.

 

eg. K encrypted is 80 server side decryption is 70 when it should be 75!

 

I would be so greatful of any help as im desperately trying to pass my programming module.

 

Many Thanks

 

Kylie

 

[flyhoney]

Can you post the code you have so far?

[Yesideez]

Welcome!

 

I see it's your first post - a good idea is to post your code (surround it with

 and 

tags!!!) so others can see what you have so far and maybe see where the problem lies.

[kle_3187]

Yeh sure, i think its something silly im doing wrong but ive looked at it so much now I can't see the problem.  Thank you 

Client

<?

$host = "localhost";

$port = 10024;

 

$name = "Kylie Evans";

$arr = array ('K','y','l','i','e','','E','v','a','n','s');

$string = implode("",$arr);

 

echo $arr;

 

print_r($arr);

//echo $arr[0];

//echo $arr[1];

//echo $arr[2];

//echo $arr[3];

//echo $arr[4];

//echo $arr[5];

//echo $arr[6];

//echo $arr[7];

//echo $arr[8];

//echo $arr[9];

//echo $arr[10];

//echo $arr[11];

 

$i=0;

foreach ($arr as $letter)

{   

$strChar = ord($arr[$i]) +5;

echo "Letter: " . $letter . "<br />";

echo "Value: " . $value. "<br />";

$i++;

$arr[$i] = $a;

}

 

// For Loop to convert each char into ascii then increase number

 

for ($i = 0; $i < strlen($arr); $i++) {

       

$strChar = ord($arr[$i]);

 

+ $strCharNumber; 

 

  $strChar = bin2hex(chr($strChar));

 

//        $strcode = $strcode & $strChar;

}

 

echo $strChar;

 

// create socket

$socket = socket_create(AF_INET, SOCK_STREAM, 0) or die("Could not create socket\n");

 

$ret = socket_connect($socket, $host, $port);

 

socket_write($socket, $string);

 

// close sockets

 

socket_close($socket);

?>

 

Server

<?

// set some variables

$host = "localhost";

$port = 10024;

//$arr = Kylie Evans;

 

//$arr = array ('K','y','l','i','e','','E','v','a','n','s');

 

  $string = 'K,y,l,i,e,E,v,a,n,s';

  $a = explode(',', $string);

  $info = print_r($a, true);

  //echo "<pre>$info</pre>";

echo $arr;

 

$i=0;

//foreach ($arr as $letter)

{   

$value = ord($arr[$i]) -5 ;

  echo "Letter: " . $letter . "<br />";

  echo "Value: " . $value. "<br />";

$i++;

}

 

echo $strChar;

 

//For Loop to convert each char into Bin then decrease number

 

for ($i = 0; $i < strlen($arr); $i++) {

       

$strChar = ord($arr[$i]);

 

+ $strCharNumber; 

 

 

$strChar = bin2hex(chr($strChar));

 

        $strcode = $strcode & $strChar;

}

 

// don't timeout!

set_time_limit(0);

// create socket

$socket = socket_create(AF_INET, SOCK_STREAM, 0) or die("Could not create socket\n");

 

// bind socket to port

$result = socket_bind($socket, $host, $port) or die("Could not bind to socket\n");

 

// start listening for connections

$result = socket_listen($socket, 3) or die("Could not set up socket listener\n");

 

// accept incoming connections

// spawn another socket to handle communication

$spawn = socket_accept($socket) or die("Could not accept incoming connection\n");

 

// read client input

$input = socket_read($spawn, 1024) or die("Could not read input\n");

 

// clean up input string

$input = trim($input);

echo $input;

 

// close sockets

socket_close($spawn);

socket_close($socket);

?>

[kle_3187]

Hi Yesideez

 

Sorry I didnt see your post regarding tags I will make sure I use them in the future!

 

I think i see where my problem is in a sense that its not displaying the incremented ASCII value so K would become F when it is encrypted and therefore the server is just reading it as K -5.