HMAC是密钥相关的哈希运算消息认证码，输入密钥和信息。  在uwp，Hmac在很多网络使用，我最近写qiniu SDK，把原来C#改为UWP，需要使用HMAC。 上传文件 ~~~ <form method="post" action="http://upload.qiniu.com/" enctype="multipart/form-data"> <input name="key" type="hidden" value="<resource_key>"> <input name="x:<custom_name>" type="hidden" value="<custom_value>"> <input name="token" type="hidden" value="<upload_token>"> <input name="file" type="file" /> <input name="crc32" type="hidden" /> <input name="accept" type="hidden" /> </form> ~~~ 需要凭据，凭据有上传策略 ~~~ string str_alg_name = MacAlgorithmNames.HmacSha1; MacAlgorithmProvider obj_mac_prov = MacAlgorithmProvider.OpenAlgorithm(str_alg_name); IBuffer buff_msg = CryptographicBuffer.CreateFromByteArray(path_and_query_bytes); IBuffer buff_key_material = CryptographicBuffer.CreateFromByteArray(mac.SecretKey); CryptographicKey hmac_key = obj_mac_prov.CreateKey(buff_key_material); IBuffer hmac = CryptographicEngine.Sign(hmac_key, buff_msg); byte[] digest = hmac.ToArray(); ~~~ `string str_alg_name = MacAlgorithmNames.HmacSha1;`微软有AesCmac、HmacMd5、HmacSha1、HmacSha256、HmacSha384、HmacSha512 `MacAlgorithmProvider.OpenAlgorithm`传入使用算法 Hmac输入buffer，byte`CryptographicBuffer.CreateFromByteArray` Hmac密钥`obj_mac_prov.CreateKey(buff_key_material)`