具有时效性的php加密解密函数代码_php技巧

<?php<BR>function encode_pass($tex,$key,$type="encode",$expiry=0){<BR>    $chrArr=array('a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',<BR>                  'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z',<BR>                  '0','1','2','3','4','5','6','7','8','9');<BR>    if($type=="decode"){<BR>        if(strlen($tex)<14)return false;<BR>        $verity_str=substr($tex, 0,8);<BR>        $tex=substr($tex, 8);<BR>        if($verity_str!=substr(md5($tex),0,8)){<BR>            //完整性验证失败<BR>            return false;<BR>        }    <BR>    }<BR>    $key_b=$type=="decode"?substr($tex,0,6):$chrArr[rand()%62].$chrArr[rand()%62].$chrArr[rand()%62].$chrArr[rand()%62].$chrArr[rand()%62].$chrArr[rand()%62];<br><br>    $rand_key=$key_b.$key;    <BR>    //设置时间选项<BR>    $modnum=0;$modCount=0;$modCountStr="";<BR>    if($expiry>0){<BR>        if($type=="decode"){<BR>         <strong>+本文来源gao@daima#com搞(%代@#码网</strong><pre>搞代gaodaima码

$modCountStr=substr($tex,6,1);
$modCount=$modCountStr==”a”?10:floor($modCountStr);
$modnum=substr($tex,7,$modCount);
$rand_key=$rand_key.(floor((time()-$modnum)/$expiry));
}else{
$modnum=time()%$expiry;
$modCount=strlen($modnum);
$modCountStr=$modCount==10?”a”:$modCount;

$rand_key=$rand_key.(floor(time()/$expiry));
}
$tex=$type==”decode”?base64_decode(substr($tex, (7+$modCount))):”xugui”.$tex;
}else{
$tex=$type==”decode”?base64_decode(substr($tex, 6)):”xugui”.$tex;
}
$rand_key=md5($rand_key);

$texlen=strlen($tex);
$reslutstr=””;
for($i=0;$i<$texlen;$i++){
$reslutstr.=$tex{$i}^$rand_key{$i%32};
}
if($type!=”decode”){
$reslutstr=trim(base64_encode($reslutstr),”==”);
$reslutstr=$modCount?$modCountStr.$modnum.$reslutstr:$reslutstr;
$reslutstr=$key_b.$reslutstr;
$reslutstr=substr(md5($reslutstr), 0,8).$reslutstr;
}else{
if(substr($reslutstr,0, 5)!=”xugui”){
return false;
}
$reslutstr=substr($reslutstr, 5);
}
return $reslutstr;
}
$psa=encode_pass(“woshi ceshi yong de “,”taintainxousad”,”encode”,120);
echo $psa;
echo “\r\n解密：”;
echo encode_pass($psa,”taintainxousad”,’decode’,120);
?>

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