PHP 写的加密函数,支持私人密钥

发布时间：2009-12-01 17:20:36，阅读人数：321

代码如下:
PHP:

// 说明：PHP 写的加密函数,支持私人密钥
// 整理：http://icyboy.0fees.net

function keyED($txt,$encrypt_key)
{
$encrypt_key = md5($encrypt_key);
$ctr=0;
$tmp = "";
for ($i=0;$i
{
if ($ctr==strlen($encrypt_key)) $ctr=0;
$tmp.= substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1);
$ctr++;
}
return $tmp;
}

function encrypt($txt,$key)
{
srand((double)microtime()*1000000);
$encrypt_key = md5(rand(0,32000));
$ctr=0;
$tmp = "";
for ($i=0;$i
{
if ($ctr==strlen($encrypt_key)) $ctr=0;
$tmp.= substr($encrypt_key,$ctr,1) . (substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1));
$ctr++;
}
return keyED($tmp,$key);
}

function decrypt($txt,$key)
{
$txt = keyED($txt,$key);
$tmp = "";
for ($i=0;$i
{
$md5 = substr($txt,$i,1);
$i++;
$tmp.= (substr($txt,$i,1) ^ $md5);
}
return $tmp;
}

$key = "www.yitu.org";
$string = "我是加密字符";

// encrypt $string, and store it in $enc_text
$enc_text = encrypt($string,$key);

// decrypt the encrypted text $enc_text, and store it in $dec_text
$dec_text = decrypt($enc_text,$key);

print "加密的 text : $enc_text 
“;
print “解密的 text : $dec_text 
“;
?>

每一次加密后的结果是不一样的,大大加强了密码的安全性.