ca88编程一段php加密解密的代码

作者:ca88编程

<?php  
$key = "This is supposed to be a secret key !!!";  

<?php
// 表达:PHP 写的加密函数,协助私人密钥
// 整理:http://www.111cn.net
 
function keyED($txt,$encrypt_key)
{
    $encrypt_key = md5($encrypt_key);
    $ctr=0;
    $tmp = "";
    for ($i=0;$i<strlen($txt);$i )
    {
        if ($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;$i<strlen($txt);$i )
    {
        if ($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;$i<strlen($txt);$i )
    {
        $md5 = substr($txt,$i,1);
        $i ;
        $tmp.= (substr($txt,$i,1) ^ $md5);
    }
    return $tmp;

 
$key = "YITU.org";
$string = "作者是加密字符";  
 
// 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 <Br> ";
print "解密的 text : $dec_text <Br> ";
?>

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

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

 代码如下

function encrypt($txt,$key)
{
srand((double)microtime()*1000000);
$encrypt_key = md5(rand(0,32000));
$ctr=0;
$tmp = "";
for ($i=0;$i<strlen($txt);$i )
{
if ($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);
}

print "Original text : $string <Br>n";  
print "Encrypted text : $enc_text <Br>n";  
print "Decrypted text : $dec_text <Br>n";  
?>  

print "原始字符串 : $string <Br>n";
print "加密后字串 : $enc_text <Br>n";
print "解密后字串 : $dec_text <Br>n";
?>

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