verdiginiz metni, bir anahtara göre şifreleyebilen ve daha sonra verdiginiz anahtarla metini tekrar okunabilir hale getirebilen sınıf.
class.encrypt.php
<?php
// *****************************************************************************
// Copyright 2003-2004 by A J Marston <http://www.tonymarston.net>
// Distributed under the GNU General Public Licence
// *****************************************************************************
session_start();
class Encryption {
var $scramble1; // 1st string of ASCII characters
var $scramble2; // 2nd string of ASCII characters
var $errors; // array of error messages
var $adj; // 1st adjustment value (optional)
var $mod; // 2nd adjustment value (optional)
// ****************************************************************************
// class constructor
// ****************************************************************************
function encryption ()
{
$this->errors = array();
// Each of these two strings must contain the same characters, but in a different order.
// Use only printable characters from the ASCII table.
// Do not use single quote, double quote or backslash as these have special meanings in PHP.
// Each character can only appear once in each string EXCEPT for the first character
// which must be duplicated at the end (this gets round a bijou problemette when the
// first character of the password is also the first character in $scramble1).
$this->scramble1 = '! #$%&()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[]^_`abcdefghijklmnopqrstuvwxyz{|}~!';
$this->scramble2 = 'f^jAE]okIOzU[2&q1{3`h5w_794p@6s8?BgP>dFV=m D<TcS%Ze|r:lGK/uCy.Jx)HiQ!#$~(;Lt-R}Ma,NvW+Ynb*0Xf';
if (strlen($this->scramble1) <> strlen($this->scramble2)) {
$this->errors[] = '** SCRAMBLE1 is not same length as SCRAMBLE2 **';
} // if
$this->adj = 1.75; // this value is added to the rolling fudgefactors
$this->mod = 3; // if divisible by this the adjustment is made negative
} // constructor
// ****************************************************************************
function decrypt ($key, $source)
// decrypt string into its original form
{
//DebugBreak();
// convert $key into a sequence of numbers
$fudgefactor = $this->_convertKey($key);
if ($this->errors) return;
if (empty($source)) {
$this->errors[] = 'No value has been supplied for decryption';
return;
} // if
$target = null;
$factor2 = 0;
for ($i = 0; $i < strlen($source); $i++) {
// extract a character from $source
$char2 = substr($source, $i, 1);
// identify its position in $scramble2
$num2 = strpos($this->scramble2, $char2);
if ($num2 === false) {
$this->errors[] = "Source string contains an invalid character ($char2)";
return;
} // if
if ($num2 == 0) {
// use the last occurrence of this letter, not the first
$num2 = strlen($this->scramble1)-1;
} // if
// get an adjustment value using $fudgefactor
$adj = $this->_applyFudgeFactor($fudgefactor);
$factor1 = $factor2 + $adj; // accumulate in $factor1
$num1 = round($factor1 * -1) + $num2; // generate offset for $scramble1
$num1 = $this->_checkRange($num1); // check range
$factor2 = $factor1 + $num2; // accumulate in $factor2
// extract character from $scramble1
$char1 = substr($this->scramble1, $num1, 1);
// append to $target string
$target .= $char1;
//echo "char1=$char1, num1=$num1, adj= $adj, factor1= $factor1, num2=$num2, char2=$char2, factor2= $factor2<br />\n";
} // for
return rtrim($target);
} // decrypt
// ****************************************************************************
function encrypt ($key, $source, $sourcelen = 0)
// encrypt string into a garbled form
{
//DebugBreak();
// convert $key into a sequence of numbers
$fudgefactor = $this->_convertKey($key);
if ($this->errors) return;
if (empty($source)) {
$this->errors[] = 'No value has been supplied for encryption';
return;
} // if
// pad $source with spaces up to $sourcelen
while (strlen($source) < $sourcelen) {
$source .= ' ';
} // while
$target = null;
$factor2 = 0;
for ($i = 0; $i < strlen($source); $i++) {
// extract a character from $source
$char1 = substr($source, $i, 1);
// identify its position in $scramble1
$num1 = strpos($this->scramble1, $char1);
if ($num1 === false) {
$this->errors[] = "Source string contains an invalid character ($char1)";
return;
} // if
// get an adjustment value using $fudgefactor
$adj = $this->_applyFudgeFactor($fudgefactor);
$factor1 = $factor2 + $adj; // accumulate in $factor1
$num2 = round($factor1) + $num1; // generate offset for $scramble2
$num2 = $this->_checkRange($num2); // check range
$factor2 = $factor1 + $num2; // accumulate in $factor2
// extract character from $scramble2
$char2 = substr($this->scramble2, $num2, 1);
// append to $target string
$target .= $char2;
//echo "char1=$char1, num1=$num1, adj= $adj, factor1= $factor1, num2=$num2, char2=$char2, factor2= $factor2<br />\n";
} // for
return $target;
} // encrypt
// ****************************************************************************
function getAdjustment ()
// return the adjustment value
{
return $this->adj;
} // setAdjustment
// ****************************************************************************
function getModulus ()
// return the modulus value
{
return $this->mod;
} // setModulus
// ****************************************************************************
function setAdjustment ($adj)
// set the adjustment value
{
$this->adj = (float)$adj;
} // setAdjustment
// ****************************************************************************
function setModulus ($mod)
// set the modulus value
{
$this->mod = (int)abs($mod); // must be a positive whole number
} // setModulus
// ****************************************************************************
// private methods
// ****************************************************************************
function _applyFudgeFactor (&$fudgefactor)
// return an adjustment value based on the contents of $fudgefactor
// NOTE: $fudgefactor is passed by reference so that it can be modified
{
$fudge = array_shift($fudgefactor); // extract 1st number from array
$fudge = $fudge + $this->adj; // add in adjustment value
$fudgefactor[] = $fudge; // put it back at end of array
if (!empty($this->mod)) { // if modifier has been supplied
if ($fudge % $this->mod == 0) { // if it is divisible by modifier
$fudge = $fudge * -1; // make it negative
} // if
} // if
return $fudge;
} // _applyFudgeFactor
// ****************************************************************************
function _checkRange ($num)
// check that $num points to an entry in $this->scramble1
{
$num = round($num); // round up to nearest whole number
// indexing starts at 0, not 1, so subtract 1 from string length
$limit = strlen($this->scramble1)-1;
while ($num > $limit) {
$num = $num - $limit; // value too high, so reduce it
} // while
while ($num < 0) {
$num = $num + $limit; // value too low, so increase it
} // while
return $num;
} // _checkRange
// ****************************************************************************
function _convertKey ($key)
// convert $key into an array of numbers
{
if (empty($key)) {
$this->errors[] = 'No value has been supplied for the encryption key';
return;
} // if
$array[] = strlen($key); // first entry in array is length of $key
$tot = 0;
for ($i = 0; $i < strlen($key); $i++) {
// extract a character from $key
$char = substr($key, $i, 1);
// identify its position in $scramble1
$num = strpos($this->scramble1, $char);
if ($num === false) {
$this->errors[] = "Key contains an invalid character ($char)";
return;
} // if
$array[] = $num; // store in output array
$tot = $tot + $num; // accumulate total for later
} // for
$array[] = $tot; // insert total as last entry in array
return $array;
} // _convertKey
// ****************************************************************************
} // end Encryption
// ****************************************************************************
?>Kullanım<?php $metin="Sifrelenmek Istiyorum"; $mod=10; $adj=0.5; $key="Anahtar"; $len=10; $crypt=new Encryption(); $crypt->setAdjustment($adj); $crypt->setModulus($mod); $sifrelenmis=$crypt->encrypt($key, $metin, $len); echo $sifrelenmis; echo "<br>"; $eskiMetin=$crypt->decrypt($key,$sifrelenmis); echo $eskiMetin; ?>
