PHP的加密解密函数。还不错
代码语言：javascript复制/**
* 加密函数
* [url=home.php?mod=space&uid=952169]@Param[/url] mixed $txt 需要加密的数据
* @param string $key 密钥
* [url=home.php?mod=space&uid=155549]@Return[/url] string 返回加密结果
*/
function encrypt($txt, $key = ''){
if (empty($txt)) return $txt;
if (is_array($txt)) $txt = serialize($txt);
if (empty($key)) $key = md5('MD5_KEY');
$chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_.";
$ikey ="-x6g6ZWm2G9g_vr0Bo.pOq3kRIxsZ6rm";
$nh1 = rand(0,64);
$nh2 = rand(0,64);
$nh3 = rand(0,64);
$ch1 = $chars{$nh1};
$ch2 = $chars{$nh2};
$ch3 = $chars{$nh3};
$nhnum = $nh1 $nh2 $nh3;
$knum = 0;$i = 0;
while(isset($key{$i})) $knum =ord($key{$i });
$mdKey = substr(md5(md5(md5($key.$ch1).$ch2.$ikey).$ch3),$nhnum%8,$knum%8 16);
$txt = base64_encode(time().'_'.$txt);
$txt = str_replace(array(' ','/','='),array('-','_','.'),$txt);
$tmp = '';
$j=0;$k = 0;
$tlen = strlen($txt);
$klen = strlen($mdKey);
for ($i=0; $i<$tlen; $i ) {
$k = $k == $klen ? 0 : $k;
$j = ($nhnum strpos($chars,$txt{$i}) ord($mdKey{$k }))d;
$tmp .= $chars{$j};
}
$tmplen = strlen($tmp);
$tmp = substr_replace($tmp,$ch3,$nh2 % $tmplen,0);
$tmp = substr_replace($tmp,$ch2,$nh1 % $tmplen,0);
$tmp = substr_replace($tmp,$ch1,$knum % $tmplen,0);
return $tmp;
}
/**
* 解密函数
* @param string $txt 需要解密的字符串
* @param string $key 密匙
* @return string 字符串类型的返回结果
*/
function decrypt($txt, $key = '', $ttl = 0){
if (empty($txt)) return $txt;
if (empty($key)) $key = md5('MD5_KEY');
$chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_.";
$ikey = "-x6g6ZWm2G9g_vr0Bo.pOq3kRIxsZ6rm";
$knum = 0;$i = 0;
$tlen = @strlen($txt);
while(isset($key{$i})) $knum =ord($key{$i });
$ch1 = @$txt{$knum % $tlen};
$nh1 = strpos($chars,$ch1);
$txt = @substr_replace($txt,'',$knum % $tlen--,1);
$ch2 = @$txt{$nh1 % $tlen};
$nh2 = @strpos($chars,$ch2);
$txt = @substr_replace($txt,'',$nh1 % $tlen--,1);
$ch3 = @$txt{$nh2 % $tlen};
$nh3 = @strpos($chars,$ch3);
$txt = @substr_replace($txt,'',$nh2 % $tlen--,1);
$nhnum = $nh1 $nh2 $nh3;
$mdKey = substr(md5(md5(md5($key.$ch1).$ch2.$ikey).$ch3),$nhnum % 8,$knum % 8 16);
$tmp = '';
$j = 0; $k = 0;
$tlen = @strlen($txt);
$klen = @strlen($mdKey);
for ($i=0; $i<$tlen; $i ) {
$k = $k == $klen ? 0 : $k;
$j = strpos($chars,$txt{$i})-$nhnum - ord($mdKey{$k });
while ($j<0) $j =64;
$tmp .= $chars{$j};
}
$tmp = str_replace(array('-','_','.'),array(' ','/','='),$tmp);
$tmp = trim(base64_decode($tmp));
if (preg_match("/d{10}_/s",substr($tmp,0,11))){
if ($ttl > 0 && (time() - substr($tmp,0,11) > $ttl)){
$tmp = null;
}else{
$tmp = substr($tmp,11);
}
}
//解密出来后先反序列化看是否是一个数组信息
$res = unserialize($tmp);
if($res){
return $res;
}else{
return $tmp;
}
}
