之前做iOS使用的是AES+RSA加密，這次flutter使用sha1驗籤
php給的文件。php通過hash_hmac方法直接傳入兩個引數token和資料，token對資料字串加密獲得簽名。
function signature(array $data, $token)
{
    $signStr = '';
    ksort($data);
    foreach ($data as $key=>$val){
        if(!is_scalar($val)){
            $val = json_encode($val);
        }
        $signStr .= $key . $val;
    }
    return strtoupper(bin2hex(hash_hmac('sha1', $signStr, $token, true)));
}

flutter中解決 解密出來的結果是103c6e83fa9c75a1f20486f950faaddafd9e3f65 
 
跟php驗籤成功
    const token = "qmbn6jmgxidclbarne9srczb92yz53pe";
 Map parameters = {
 "auth_name": "qqqqqqq",
 "APP-ID": "123456",
 };
 //獲得字典中所有key並排序
 List attrKeys = parameters.keys.toList();
 attrKeys.sort();
 
 //獲得字典中資料的字串
 String parameterStr = '';
 for (var i = 0; i < attrKeys.length; i++) {
 parameterStr += "${attrKeys[i]}${parameters[attrKeys[i]]}";
 }

 var key = utf8.encode(token);
 var bytes = utf8.encode(parameterStr);
 //使用token對字典加密
 var hmacSha1 = Hmac(sha1, key);
 Digest sha1Result = hmacSha1.convert(bytes);
    //轉大寫字串
    var sha1ResultStr = sha1Result.toString().toUpperCase();
 print("sha1ResultStr
 
:$sha1ResultStr");