Authentication
Requests for calling an API can be authenticated using either of the following methods:
- Token-based authentication: Requests are authenticated using a token.
- AK/SK-based authentication: Requests are authenticated by encrypting the request body using an AK/SK pair.
Token-based Authentication

- The validity period of a token is 24 hours. When using a token for authentication, cache it to prevent frequently calling the Identity and Access Management (IAM) API for obtaining a user token.
- Ensure that the token is valid when you use it. Using a token that will soon expire may cause API calling failures.
A token specifies temporary permissions in a computer system. During API authentication using a token, the token is added to requests to get permissions for calling the API.
When calling the API to obtain a user token, you must set auth.scope in the request body to project.
{ "auth": { "identity": { "methods": [ "password" ], "password": { "user": { "name": "username", "password": "********", "domain": { "name": "domainname" } } } }, "scope": { "project": { "name": "xxxxxxxx" } } } }
After a token is obtained, the X-Auth-Token header field must be added to requests to specify the token when other APIs are called. For example, if the token is ABCDEFG...., add X-Auth-Token: ABCDEFG.... to a request as follows:
GET https://iam.ap-southeast-3.myhuaweicloud.com/v3.0/OS-USER/users Content-Type: application/json X-Auth-Token: ABCDEFJ....
AK/SK-based Authentication

- AK/SK-based authentication supports API requests with a body not larger than 12 MB. For API requests with a larger body, token-based authentication is recommended.
- You can use the AK/SK in either a permanent or temporary access key. If you are using a temporary access key, configure the X-Security-Token field whose value is the security_token of the temporary access key.
In AK/SK-based authentication, AK/SK is used to sign requests and the signature is then added to the requests for authentication.
- AK: access key ID. It is a unique ID associated with an SK. AK is used together with SK to sign requests.
- SK: secret access key. It is used together with an access key ID to identify a sender who initiates a request and to cryptographically sign requests, preventing the request from being modified.
In AK/SK-based authentication, you can sign requests either using an AK/SK pair based on the signature algorithm or using the signing SDK. For details about how to sign requests and use the signing SDK, see AK/SK Signing and Authentication Guide.

Unlike the SDKs provided by services, the signing SDK is only used for signing requests.
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