首页 / 网页编程 / PHP / 具有时效性的php加密解密函数代码

复制代码 代码如下:
<？php
function encode_pass（$tex,$key,$type="encode",$expiry=0）{
    $chrArr=array（"a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z",
                  "A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z",
                  "0","1","2","3","4","5","6","7","8","9"）;
    if（$type=="decode"）{
        if（strlen（$tex）<14）return false;
        $verity_str=substr（$tex, 0,8）;
        $tex=substr（$tex, 8）;
        if（$verity_str！=substr（md5（$tex）,0,8））{
            //完整性验证失败
            return false;
        }   
    }
    $key_b=$type=="decode"？substr（$tex,0,6）:$chrArr[rand（）%62].$chrArr[rand（）%62].$chrArr[rand（）%62].$chrArr[rand（）%62].$chrArr[rand（）%62].$chrArr[rand（）%62];

    $rand_key=$key_b.$key;   
    //设置时间选项
    $modnum=0;$modCount=0;$modCountStr="";
    if（$expiry>0）{
        if（$type=="decode"）{
            $modCountStr=substr（$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 $psa;
echo " 解密：";
echo encode_pass（$psa,"taintainxousad","decode",120）;
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