前言

最近搞一点东西要用到对称加密，于是在网上找到一个不错的对称加密方法，分享给大家。

/**
 * 简单对称加密算法之加密
 * @param String $string 需要加密的字串
 * @param String $skey 加密EKY
 * @author Anyon Zou <zoujingli@qq.com>
 * @date 2013-08-13 19:30
 * @update 2014-10-10 10:10
 * @return String
 */
function encode($string = '', $skey = 'cxphp') {
    $strArr = str_split(base64_encode($string));
    $strCount = count($strArr);
    foreach (str_split($skey) as $key => $value)
        $key < $strCount && $strArr[$key].=$value;
    return str_replace(array('=', '+', '/'), array('O0O0O', 'o000o', 'oo00o'), join('', $strArr));
}

/**
 * 简单对称加密算法之解密
 * @param String $string 需要解密的字串
 * @param String $skey 解密KEY
 * @author Anyon Zou <zoujingli@qq.com>
 * @date 2013-08-13 19:30
 * @update 2014-10-10 10:10
 * @return String
 */
function decode($string = '', $skey = 'cxphp') {
    $strArr = str_split(str_replace(array('O0O0O', 'o000o', 'oo00o'), array('=', '+', '/'), $string), 2);
    $strCount = count($strArr);
    foreach (str_split($skey) as $key => $value)
        $key <= $strCount  && isset($strArr[$key]) && $strArr[$key][1] === $value && $strArr[$key] = $strArr[$key][0];
    return base64_decode(join('', $strArr));
}

echo '<pre>';
$str = '56,15123365247,54,四大古典风格';
echo "string : " . $str . " <br />";
echo "encode : " . ($enstring = encode($str)) . '<br />';
echo "decode : " . decode($enstring);
die();

安全URL解码

/**
 * 安全URL编码
 * @param string $data
 * @author Anyon <zoujingli@qq.com>
 * @date 2017/06/26
 * @return string
 */
function encode($data) {
    return str_replace(array('+', '/', '='), array('-', '_', ''), base64_encode(serialize($data)));
}

/**
 * 安全URL解码
 * @param string $string
 * @author Anyon <zoujingli@qq.com>
 * @date 2017/06/26
 * @return string
 */
function decode($string) {
    $data = str_replace(array('-', '_'), array('+', '/'), $string);
    $mod4 = strlen($data) % 4;
    ($mod4) && $data .= substr('====', $mod4);
    return unserialize(base64_decode($data));
}

UTF8三十六进制

/**
 * UTF8字符串加密
 * @param string $string
 * @author Anyon <zoujingli@qq.com>
 * @date 2017/06/26
 * @return string
 */
function encode($string) {
    $chars = '';
    $len = strlen($string = iconv('utf-8', 'gbk', $string));
    for ($i = 0; $i < $len; $i++) {
        $chars .= str_pad(base_convert(ord($string[$i]), 10, 36), 2, 0, 0);
    }
    return strtoupper($chars);
}

/**
 * UTF8字符串解密
 * @param string $string
 * @author Anyon <zoujingli@qq.com>
 * @date 2017/06/26
 * @return string
 */
function decode($string) {
    $chars = '';
    foreach (str_split($string, 2) as $char) {
        $chars .= chr(intval(base_convert($char, 36, 10)));
    }
    return iconv('gbk', 'utf-8', $chars);
}

2021年1月14日

看到了一个新的对称加密函数

    //字符串加密
function lockString($txt,$key)
{
    $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";
    $nh = rand(0,64);
    $ch = $chars[$nh];
    $mdKey = md5($key.$ch);
    $mdKey = substr($mdKey,$nh%8, $nh%8+7);
    $txt = base64_encode($txt);
    $tmp = '';
    $i=0;$j=0;$k = 0;
    for ($i=0; $i<strlen($txt); $i++) {
        $k = $k == strlen($mdKey) ? 0 : $k;
        $j = ($nh+strpos($chars,$txt[$i])+ord($mdKey[$k++]))%64;
        $tmp .= $chars[$j];
    }
    return urlencode($ch.$tmp);
}

/**对字符串进行解密。
 * @param $txt
 * @param string $key
 * @return bool|string
 */
 function unlockString($txt,$key)
{
    $txt = urldecode($txt);
    $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";
    $ch = $txt[0];
    $nh = strpos($chars,$ch);
    $mdKey = md5($key.$ch);
    $mdKey = substr($mdKey,$nh%8, $nh%8+7);
    $txt = substr($txt,1);
    $tmp = '';
    $i=0;$j=0; $k = 0;
    for ($i=0; $i<strlen($txt); $i++) {
        $k = $k == strlen($mdKey) ? 0 : $k;
        $j = strpos($chars,$txt[$i])-$nh - ord($mdKey[$k++]);
        while ($j<0) $j+=64;
        $tmp .= $chars[$j];
    }
    return base64_decode($tmp);
}