Creating a CMK in AWS Key Management Service

The following example uses the AWS SDK for GoCreateKey method, which implements the CreateKey operation, to create a customer master key (CMK). Since the example only encrypts a small amount of data, a CMK is fine for our purposes. For larger amounts of data, use the CMK to encrypt a data encryption key (DEK).

import (
    "github.com/aws/aws-sdk-go/aws"
    "github.com/aws/aws-sdk-go/aws/session"
    "github.com/aws/aws-sdk-go/service/kms"

    "fmt"
    "os"
)

// Create an AWS KMS key (KMS key)
// Since we are only encrypting small amounts of data (4 KiB or less) directly,
// a KMS key is fine for our purposes.
// For larger amounts of data,
// use the KMS key to encrypt a data encryption key (DEK).

func main() {
    // Initialize a session in us-west-2 that the SDK will use to load
    // credentials from the shared credentials file ~/.aws/credentials.
    sess, err := session.NewSession(&aws.Config{
        Region: aws.String("us-west-2")},
    )

    // Create KMS service client
    svc := kms.New(sess)

    // Create the key
    result, err := svc.CreateKey(&kms.CreateKeyInput{
        Tags: []*kms.Tag{
            {
                TagKey:   aws.String("CreatedBy"),
                TagValue: aws.String("ExampleUser"),
            },
        },
    })

    if err != nil {
        fmt.Println("Got error creating key: ", err)
        os.Exit(1)
    }

    fmt.Println(*result.KeyMetadata.KeyId)
}

Choose Copy to save the code locally. See the complete example on GitHub.