Authenticate Signature Maintenance Request For Free

In the API Gateway console, choose the name of your API. In the Resources pane, choose a method (such as GET or POST) that you want to activate IAM authentication for. In the Method Execution pane, choose Method Request. Under Settings, for Authorization, choose the pencil icon (Edit).

Sign in to the API Gateway console at . Choose your API. Note your API's invoke URL. Verify your API's response. You should see the text "Hello from Lambda!" in your browser.

Construct a request to AWS. Calculate the signature using your secret access key. Send the request to Amazon S3. Include your access key ID and the signature in your request.

The Amazon S3 REST API uses a custom HTTP scheme based on a keyed-HMAC (Hash Message Authentication Code) for authentication. To authenticate a request, you first concatenate selected elements of the request to form a string. You then use your AWS secret access key to calculate the HMAC of that string.

Once the API is deployed, the client must: Sign the user into the user pool. Obtain an identity or access for the user. Call the API method using the , usually set to the request's authorization header.

SIGv4A goes through a similar scoped credentials derivation process as SIGv4, except that it derives a credential that is valid for a single service, on a single day, and then it adds another step to derive a public-private ECDSA key pair from that scoped credential.

You can also verify the digital signature by using the public key of the KMS key outside of AWS KMS. Use the GetPublicKey operation to download the public key in the asymmetric KMS key and then use the public key to verify the signature outside of AWS KMS.