PHP加密解密类(密文只有大小写字母和数字)，支持中文加密

 

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<?php/** * MrPmvc加密解密类 * @author 狂奔的蜗牛 * @email  [e-mail] * @version alpha * Usage: *      $key = new KEY('adfasdfs', 30);        $e_txt = $key->encode('中文哦..aaaa');        echo $e_txt.'<br/>';        echo $key->decode($e_txt); */class KEY {    private $expire = 0, $key = 'secret';    public function __construct($key_str = null, $time_to_live = null) {        if ($key_str) {            self::setKey($key_str);        }        if ($time_to_live) {            self::setExpire($time_to_live);        }    }    public  function setExpire($time_to_live) {        $this->expire = floatval($time_to_live);    }    public  function setKey($key_str) {        $this->key = (string) $key_str;    }    public  function encode($tex, $key = null, $expire = 0) {        $key = $key ? $key : $this->key;        $expire = $expire ? $expire : $this->expire;        $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');        $tex.="~#~" . sprintf('%010d', $expire ? $expire + time() : 0) . "~#~";        $key_b = $chrArr[rand() % 62] . $chrArr[rand() % 62] . $chrArr[rand() % 62] . $chrArr[rand() % 62] . $chrArr[rand() % 62] . $chrArr[rand() % 62];        $rand_key = $key_b . $key;        $rand_key = md5($rand_key);        $texlen = strlen($tex);        $reslutstr = "";        for ($i = 0; $i < $texlen; $i++) {            $reslutstr.=$tex{$i} ^ $rand_key{$i % 32};        }        $reslutstr = trim($key_b . base64_encode($reslutstr), "==");        $reslutstr = substr(md5($reslutstr), 0, 8) . $reslutstr;        return $reslutstr;    }    public  function decode($tex, $key = null) {        $key = $key ? $key : $this->key;        if (strlen($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;        }        $key_b = substr($tex, 0, 6);        $rand_key = $key_b . $key;        $rand_key = md5($rand_key);        $tex = base64_decode(substr($tex, 6));        $texlen = strlen($tex);        $reslutstr = "";        for ($i = 0; $i < $texlen; $i++) {            $reslutstr.=$tex{$i} ^ $rand_key{$i % 32};        }        $expiry_arr = array();        preg_match('/^(.*)~#~(\d{10})~#~$/', $reslutstr, $expiry_arr);        if (count($expiry_arr) != 3) {            //过期时间完整性验证失败            return false;        } else {            $tex_time = $expiry_arr[2];            if ($tex_time > 0 && $tex_time - time() <= 0) {                //验证码过期                return false;            } else {                $reslutstr = $expiry_arr[1];            }        }        return $reslutstr;    }}

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