### key待驗證
```
<?php
function urlsafe_b64decode($string) {
$data = str_replace(array('-', '_'), array('+', '/'), $string);
$mod4 = strlen($data) % 4;
if ($mod4) {
$data .= substr('====', $mod4);
}
return base64_decode($data);
}
function decode($final_message, $e_key, $i_key) {
$enc_price = urlsafe_b64decode($final_message);
$iv = substr($enc_price, 0, 16);
$p = substr($enc_price, 16, 8);
$sig = substr($enc_price, 24, 4);
$price_pad = hash_hmac("sha1", $iv, $e_key, true);
$price = $p ^ $price_pad;
$conf_sig = hash_hmac("sha1", $price . $iv, $i_key, true);
if ($conf_sig != $sig) {
return false;
}
return $price;
}
$e_key = "encrypriceencodingwhenintegratin";
$i_key = "integpriceencodingwhenintegratin";
foreach(["cHJpY2VlbmNvZGluZ3doZTzUyMb2dirzYcjALQ", "cHJpY2VlbmNvZGluZ3doZTjUy8b2dirzYXcL0Q", "cHJpY2VlbmNvZGluZ3doZTzKyOjDQx_zjiVOmw", "cHJpY2VlbmNvZGluZ3doZTrN1vbBdirz1G52-Q"] as $msg) {
echo decode($msg, $e_key, $i_key) . PHP_EOL;
}
```
附注：key生成方式
```
// 轉換一個字符串為byte數組
function getBytes($str){
$str = str_replace(PHP_EOL, '', $str);
$bytes = array();
for ($i = 0; $i < strlen($str); $i++) {
$bytes[] = ord($str[$i]);
}
return $bytes;
}
$e_key = base64_encode(implode('', getBytes('kingsoft')));
$i_key = base64_encode(implode('', getBytes('adx')));
```
```
輸出
XJwszwAM1ShpYgxpFjZCHnpjOT-uc5s7eH0PzA==
12
```
