Encryption.php
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<?php
namespace tinymeng\tools;
/**
* Name: Encryption.php.
* Author: JiaMeng <666@majiameng.com>
* Date: 2018/8/17 14:20
* Description: Tool.php.
*/
class Encryption{
/**
* Description: authcode
* @author: JiaMeng <666@majiameng.com>
* Updater:
* @param $string
* @param string $operation
* @param string $key
* @param int $expiry
* @return bool|string
*/
static public function authcode($string, $operation = 'decode', $key = 'tinymeng', $expiry = 0) {
$ckey_length = 4; // 随机密钥长度 取值 0-32;
// 加入随机密钥，可以令密文无任何规律，即便是原文和密钥完全相同，加密结果也会每次不同，增大破解难度。
// 取值越大，密文变动规律越大，密文变化 = 16 的 $ckey_length 次方
// 当此值为 0 时，则不产生随机密钥
$key = md5($key);
$keya = md5(substr($key, 0, 16));
$keyb = md5(substr($key, 16, 16));
$keyc = $ckey_length ? ($operation == 'decode' ? substr($string, 0, $ckey_length): substr(md5(microtime()), -$ckey_length)) : '';
$cryptkey = $keya.md5($keya.$keyc);
$key_length = strlen($cryptkey);
if($operation == 'decode'){
$string = base64_decode(substr($string, $ckey_length));
}else{
$a = $expiry ? $expiry + time() : 0;
$string = sprintf('%010d', $a).substr(md5($string.$keyb), 0, 16).$string;
}
$string_length = strlen($string);
$result = '';
$box = range(0, 255);
$rndkey = array();
for($i = 0; $i <= 255; $i++) {
$rndkey[$i] = ord($cryptkey[$i % $key_length]);
}
for($j = $i = 0; $i < 256; $i++) {
$j = ($j + $box[$i] + $rndkey[$i]) % 256;
$tmp = $box[$i];
$box[$i] = $box[$j];
$box[$j] = $tmp;
}
for($a = $j = $i = 0; $i < $string_length; $i++) {
$a = ($a + 1) % 256;
$j = ($j + $box[$a]) % 256;
$tmp = $box[$a];
$box[$a] = $box[$j];
$box[$j] = $tmp;
$result .= chr( ord($string[$i]) ^ ( $box[($box[$a] + $box[$j]) % 256]));
}
if($operation == 'decode') {
if((substr($result, 0, 10) == 0 || substr($result, 0, 10) - time() > 0) && substr($result, 10, 16) == substr(md5(substr($result, 26).$keyb), 0, 16)) {
return substr($result, 26);
} else {
return '';
}
} else {
return $keyc.str_replace('=', '', base64_encode($result));
}
}
}