HMAC是密鑰相關的哈希運算消息認證碼，輸入密鑰和信息。? 在uwp，Hmac在很多網絡使用，我最近寫qiniu SDK，把原來C#改為UWP，需要使用HMAC。 上傳文件 ~~~ <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> ~~~ 需要憑據，憑據有上傳策略 ~~~ 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;`微軟有AesCmac、HmacMd5、HmacSha1、HmacSha256、HmacSha384、HmacSha512 `MacAlgorithmProvider.OpenAlgorithm`傳入使用算法 Hmac輸入buffer，byte`CryptographicBuffer.CreateFromByteArray` Hmac密鑰`obj_mac_prov.CreateKey(buff_key_material)`