On Dec 17, 2007 7:06 PM, Grace Shibley <[EMAIL PROTECTED]> wrote:
> Hi Everyone,
>
> We have an encryption function that was written in another language that we
> needed translated to PHP.
>
> Here's the function:
>
> function rc4 pText, pKey
> -- initialize
> repeat with i = 0 to 255
> put i into S1[i]
> end repeat
>
> put 0 into i
> repeat with n = 0 to 255
> add 1 to i
> if i > length(pkey) then put 1 into i
> put chartonum(char i of pKey) into S2[n]
> end repeat
>
> put 0 into j
> repeat with i = 0 to 255
> put (j + S1[i] + S2[i]) mod 256 into j
> put S1[i] into temp
> put S1[j] into S1[i]
> put temp into S1[j]
> end repeat
>
> -- encrypt/decrypt
> put 0 into i ; put 0 into j
> repeat for each char c in pText
> put chartonum(c) into tChar
>
> put (i + 1) mod 256 into i
> put (j + S1[i]) mod 256 into j
> put S1[i] into temp
> put S1[j] into S1[i]
> put temp into S1[j]
> put (S1[i] + S1[j]) mod 256 into t
> put S1[t] into K
>
> put numtochar(tChar bitXor K) after tOutput
> end repeat
>
> return tOutput
> end rc4
>
> Can anyone help us with this? We don't mind paying via PayPal :)
>
> Thanks!
> grace
>
function rc4($pText, $pKey) {
// initialize
$S1 = range(0, 255);
$S2 = array();
$i = 0;
for ($n=0; $n<=255; $n++) {
$i++;
if ($i > strlen($pkey))
$i = 1;
$S2[] = ord($pKey[$i]);
}
$j = 0;
for ($i=0; $i<=255; $i++) {
$j = ($j + $S1[$i] + $S2[$i]) % 256;
$temp = $S1[$i];
$S1[$i] = $S1[$j];
$S1[$j] = $temp;
}
// encrypt/decrypt
$i = $j = 0;
$tOutput = '';
foreach (str_split($pText) as $c) {
$tChar = ord($c);
$i = ($i+1) % 256;
$j = ($j+$S1[$i]) % 256;
$temp = $S1[$i];
$S1[$i] = $S1[$j];
$S1[$j] = $temp;
$t = ($S1[$i] + $S1[$j]) % 256;
$K = $S1[$t];
$tOutput .= chr($tChar ^ $K);
}
return $tOutput;
}
I don't know what language this is. I'm curious -- what is it? It
might not work; it's untested except for syntax errors.
[EMAIL PROTECTED] ;]
-Casey
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