Authentication
You can use either of the following authentication methods when calling APIs:
- 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. AK/SK-based authentication is recommended because it is more secure than token-based authentication.
Token-based Authentication
![](https://support.huaweicloud.com/intl/en-us/my-kualalumpur-1-api-lts/public_sys-resources/note_3.0-en-us.png)
The validity period of a token is 24 hours. When using a token for authentication, cache it to prevent frequently calling the IAM API used to obtain a user token.
A token is used to acquire temporary permissions. During API authentication using a token, the token is added to requests to get permissions for calling the API.
You can obtain a token by calling the Obtaining User Token API. When you call the API, 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 calling other APIs. For example, if the token is ABCDEFJ...., X-Auth-Token: ABCDEFJ.... can be added to a request as follows:
POST https://iam.my-kualalumpur-1.cloudalphai4.tmone.com.my/v3/auth/tokens Content-Type: application/json X-Auth-Token: ABCDEFJ....
AK/SK-based Authentication
![](https://support.huaweicloud.com/intl/en-us/my-kualalumpur-1-api-lts/public_sys-resources/note_3.0-en-us.png)
AK/SK-based authentication supports API requests with a body no larger than 12 MB. For API requests with a larger body, you should use token-based authentication.
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, which is a unique identifier used in conjunction with a secret access key to sign requests cryptographically.
- SK: secret access key used in conjunction with an AK to sign requests cryptographically. It identifies a request sender and prevents the request from being modified.
![](https://support.huaweicloud.com/intl/en-us/my-kualalumpur-1-api-lts/public_sys-resources/notice_3.0-en-us.png)
The signing SDK is only used for signing requests and is different from the SDKs provided by services.
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