Updated on 2022-11-10 GMT+08:00


Requests for calling an API can be authenticated using either of the following methods:

  • Token authentication: Requests are authenticated using Tokens.
  • AK/SK authentication: Requests are encrypted using an AK/SK.

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.

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, set auth.scope in the request body to project.

    "auth": { 
        "identity": { 
            "methods": [ 
            "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:

GET https://iam.ap-southeast-3.myhuaweicloud.com/v3/auth/tokens
Content-Type: application/json
X-Auth-Token: ABCDEFJ....

AK/SK-based 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.

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 used in conjunction with an AK to sign requests cryptographically. It identifies a request sender and prevents the request from being modified.

In AK/SK-based authentication, you can use an AK/SK to sign requests based on the signature algorithm or use the signing SDK to sign requests. For details about how to sign requests and use the signing SDK, see AK/SK Signing and Authentication Guide.

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