96 lines
3.5 KiB
PHP
96 lines
3.5 KiB
PHP
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<?php
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// ------------------------------------------------------------------------------
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// Function : str_encrypt($string) / str_decrypt($string)
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// Description : en/decrypt $data with the key in $keyfile with an rc4 algorithm
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// Return : en/decrypted string which is URL safe
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//
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// NOTE: Dec 12, 2005 (Mythos and Rini)
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// - Serious problem after upgraded from 5.0.5 to 5.1.1
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// Because of the base64_decode function, if there is space in the string
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// it ignores it. For example: base64_decode(string);
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//
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// In 5.0.5, it treats "abc" and "a bc" differently
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// In 5.1.1, it treats "abc" and "a bc" the same when decode
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// http://bugs.php.net/bug.php?id=35649
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// The original code was:
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// urlencode(base64_encode($mystr); // PROBLEM: if there is space in mystr
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// To code should have been like this:
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// base64_encode(urlencode($mystr)); // Encode any space become '+' first
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// But this won't work because there are existing encrypted data in database already
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//
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// Cause: $_GET automatically converts '%2B' into '+' automatically, when we
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// do the urldecode, it generates the space! Now when it comes to the difference
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// between 5.0.5 vs 5.1.1 base64_decode, the result is different.
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//
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// urldecode("a+bc") // a bc <-- PROBLEM, base64_decode ignores the space
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/**/define("WPF_KEY_FOR_RC4", wpf_get_cartpauj_url());
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// urldecode("a%2Bbc"); // a+bc
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//
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// Both '+' and '%2B' got the same result
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// rawurldecode("a+bc") // a+bc <-- SOLVED
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// rawurldecode("a%2Bbc"); // a+bc
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//
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// ------------------------------------------------------------------------------
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function wpf_get_cartpauj_url() {
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return (string)$_SERVER["DOCUMENT_ROOT"].substr(uniqid(''), 0, 3);
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}
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function wpf_str_encrypt($str) {
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$mystr = WPFRC4($str, WPF_KEY_FOR_RC4);
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$mystr = rawurlencode(base64_encode($mystr));
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return $mystr;
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}
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function wpf_str_decrypt($str) {
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$mystr = base64_decode(rawurldecode($str));
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$mystr = WPFRC4($mystr, WPF_KEY_FOR_RC4);
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return $mystr;
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}
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// ------------------------------------------------------------------------------
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// Function : WPFRC4($data, $key)
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// Description : ecncrypt/decrypt $data with the key in $keyfile with an rc4 algorithm
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// This was written by danzarrella in 2002 can be found on Zend.com
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// Return : string (encrypted/decrypted)
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// ------------------------------------------------------------------------------
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function WPFRC4($data, $key) {
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// initialize (modified by Simon Lee)
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$x=0; $j=0; $a=0; $temp=""; $Zcrypt="";
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for ($i=0; $i<=255; $i++) {
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$counter[$i] = "";
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}
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// $pwd = implode('', file($keyfile));
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$pwd = $key;
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$pwd_length = strlen($pwd);
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for ($i = 0; $i < 255; $i++) {
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$key[$i] = ord(substr($pwd, ($i % $pwd_length)+1, 1));
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$counter[$i] = $i;
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}
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for ($i = 0; $i < 255; $i++) {
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$x = ($x + $counter[$i] + $key[$i]) % 256;
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$temp_swap = $counter[$i];
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$counter[$i] = $counter[$x];
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$counter[$x] = $temp_swap;
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}
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for ($i = 0; $i < strlen($data); $i++) {
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$a = ($a + 1) % 256;
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$j = ($j + $counter[$a]) % 256;
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$temp = $counter[$a];
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$counter[$a] = $counter[$j];
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$counter[$j] = $temp;
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$k = $counter[(($counter[$a] + $counter[$j]) % 256)];
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$Zcipher = ord(substr($data, $i, 1)) ^ $k;
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$Zcrypt .= chr($Zcipher);
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}
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return $Zcrypt;
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}
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