Authentication
Requests for calling an API can be authenticated using either of the following methods:
- Token authentication: Requests are authenticated using a token.
- Access Key ID/Secret Access Key (AK/SK) authentication: Requests are authenticated by encrypting the request body using an AK/SK.
AK/SK Authentication

- AK/SK authentication supports API requests with a body no larger than 12 MB. For API requests with a larger body, use token authentication.
- You can use the AK/SK in a permanent or temporary access key. The X-Security-Token field must be configured if the AK/SK in a temporary access key is used, and the field value is security_token of the temporary access key.
In AK/SK authentication, the 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.

The signing SDK is only used for signing requests and is different from the SDKs provided by services.
Token Authentication

- The validity period of a token is 24 hours. When using a token for authentication, cache it to prevent frequently calling the IAM API for obtaining a user token.
- Ensure that the token is valid while you use it. Using a token that will soon expire may cause API calling failures.
A token specifies temporary permissions in a computer system. Token authentication adds the token in a request as its header during API calling to obtain permissions to use APIs.
When calling the API used 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, add X-Auth-Token to the request header to specify the token when calling other APIs. For example, if the token is ABCDEFJ...., X-Auth-Token: ABCDEFG.... can be added to the request header as follows:
POST https://iam.ap-southeast-1.myhuaweicloud.com/v3.0/OS-USER/users POST https://iam.eu-west-101.myhuaweicloud.com/v3.0/OS-USER/users Content-Type: application/json X-Auth-Token: ABCDEFG....
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