[SOLVED] Password encrypter/decrypter - a little guidance please

[niallniall]

Hello,

 

A couple of people on here helped me make this yesterday: http://www.onlineworx.net/testing/gen1.php

 

It basically lets my encrypt sensitive information to passed around to my colleagues safely over the internet via email and instant messaging etc. I give trusted partners a copy of this to store locally and they can safely decrypt the information when it arrives.

 

I need the thing to be able to differentiate between capital and non capital letters but I cant figure out how to do it.

 

Here's the code:

 

<form action=" <?=$_SERVER['PHP_SELF']?>" method="post">
Make a password to send:<br />
<textarea name="user_junk" cols="20" rows="1">
</textarea>
<input type="submit" name="submit" value="encrypt"/>
</form>

<form action=" <?=$_SERVER['PHP_SELF']?>" method="post">
Unscramble password:<br />
<textarea name="user_junk" cols="20" rows="1">
</textarea>
<input type="submit" name="submit" value="decrypt"/>
<p>


<?php
if ($_POST['submit'] == "encrypt") {
$user_junk = strtolower($_POST['user_junk']);
$coded = "";
for ($i=0;$i<strlen($user_junk);$i++) {
	$char = $user_junk{$i};
	if ($char == "z") $char = "`"; // forced roll z to a
	if ($char == "9") $char = "/"; // forced roll 9 to 0
	$coded.= chr(ord($char) + 1);
}
echo "Encryted Password:<br>".$coded. "<br/><br/>";
}
if ($_POST['submit'] == "decrypt") {
$user_junk = strtolower($_POST['user_junk']);
$coded = "";
for ($i=0;$i<strlen($user_junk);$i++) {
	$char = $user_junk{$i};
	if ($char == "a") $char = "{";  // forced roll z to a
	if ($char == "0") $char = ":";  // forced roll 0 to 9
	$coded.= chr(ord($char) - 1);
}
   echo "Decrypted Password:<br>".stripslashes($coded). "<br/><br/>";
}

?>

 

Here's how I thought I could make it work! But alas it doesn't work.

 

<form action=" <?=$_SERVER['PHP_SELF']?>" method="post">
Make a password to send:<br />
<textarea name="user_junk" cols="20" rows="1">
</textarea>
<input type="submit" name="submit" value="encrypt"/>
</form>

<form action=" <?=$_SERVER['PHP_SELF']?>" method="post">
Unscramble password:<br />
<textarea name="user_junk" cols="20" rows="1">
</textarea>
<input type="submit" name="submit" value="decrypt"/>
<p>


<?php
if ($_POST['submit'] == "encrypt") {
$user_junk = strtolower($_POST['user_junk']);
$coded = "";
for ($i=0;$i<strlen($user_junk);$i++) {
	$char = $user_junk{$i};
	if ($char == "z") $char = "`"; // forced roll z to a
	if ($char == "9") $char = "/"; // forced roll 9 to 0
	$coded.= chr(ord($char) + 1);
}
echo "Encryted Password:<br>".$coded. "<br/><br/>";
}
if ($_POST['submit'] == "decrypt") {
$user_junk = strtolower($_POST['user_junk']);
$coded = "";
for ($i=0;$i<strlen($user_junk);$i++) {
	$char = $user_junk{$i};
	if ($char == "a") $char = "{";  // forced roll z to a
	if ($char == "0") $char = ":";  // forced roll 0 to 9
	$coded.= chr(ord($char) - 1);
}
   echo "Decrypted Password:<br>".stripslashes($coded). "<br/><br/>";
}

?>

 

 

 

Can one of you please help me get this thing to treat capitals and non capitals seperately.

 

Any help would me much appreciated.

 

Cheers

[niallniall]

anyone?

[Orio]

First of all, if you really need encrypting / decrypting to transfer sensitive information, don't use so simple encoding-decoding methods... Check mCrypt.

 

Anyway, you are applying strtolower() on the input so it's all going to be small case.

 

I'd do it this way tho:

 

<form action=" <?=$_SERVER['PHP_SELF']?>" method="post">
Make a password to send:<br />
<textarea name="user_junk" cols="20" rows="1">
</textarea>
<input type="submit" name="submit" value="encrypt"/>
</form>

<form action=" <?=$_SERVER['PHP_SELF']?>" method="post">
Unscramble password:<br />
<textarea name="user_junk" cols="20" rows="1">
</textarea>
<input type="submit" name="submit" value="decrypt"/>
<p>

<?php

$chars[0] = array_merge(range(65,90), range(97,122), range(48,57));
$chars[1] = array_merge(range(66,90), array(65), range(98,122), array(97), range(49,57), array(48));
array_walk($chars[0], "chr2");
array_walk($chars[0], "chr2");


if ($_POST['submit'] == "encrypt")
{
$coded = str_replace($chars[0], $chars[1], $_POST['user_junk']);
echo "Encryted Password:<br>".$coded. "<br/><br/>";
}
if ($_POST['submit'] == "decrypt")
{
$coded = str_replace($chars[1], $chars[0], $_POST['user_junk']);
echo "Decryted Password:<br>".$coded. "<br/><br/>";
}

function chr2 (&$a)
{
$a = chr($a);
}

?>

 

EDIT- for some reason it doesn't work, I'll check it later tho.

 

Orio.

[niallniall]

Did you get it to work?

[Orio]

lol it was more complicated than I've thought, I guess I was just thinking wrong. And I've learned something about str_replace()...

Anyway, this works:

 

<form action=" <?=$_SERVER['PHP_SELF']?>" method="post">
Make a password to send:<br />
<textarea name="user_junk" cols="20" rows="1">
</textarea>
<input type="submit" name="submit" value="encrypt"/>
</form>

<form action=" <?=$_SERVER['PHP_SELF']?>" method="post">
Unscramble password:<br />
<textarea name="user_junk" cols="20" rows="1">
</textarea>
<input type="submit" name="submit" value="decrypt"/>
<p>

<?php
if(!isset($_POST['submit']))
die;

$chars = array();
$regular = array_merge(range(65,90), range(97,122), range(48,57));
$temp[0] = array_merge(array(90), range(65,89), array(122), range(97,121), array(48), range(48,56));
$temp[1] = array_merge(range(66,90), array(65), range(98,122), array(97), range(49,57), array(48));
for($i=0; $i<count($temp[0]); $i++)
{
$chars[0][$regular[$i]] = $temp[0][$i];
$chars[1][$regular[$i]] = $temp[1][$i];
}



$coded = "";
$method = ($_POST['submit'] == "encrypt") ? 1 : 0;
for($i=0; $i<strlen($_POST['user_junk']); $i++)
{
$char = ord($_POST['user_junk']{$i});
if(isset($chars[$method][$char]))
	$coded .= chr($chars[$method][$char]);
}
if($method == 1)
echo "Encryted Password:<br>".$coded. "<br/><br/>";
else
echo "Decryted Password:<br>".$coded. "<br/><br/>";

?>

 

 

Enjoy,

Orio.

[niallniall]

This is my first time with a problem on this forum and I am complete php noobie. In less than a day members here have solved three different problems for me. Wow this forum is brilliant keep up the good work guys!