createAlias method

Future<void> createAlias({ required String aliasName, required String targetKeyId, })

Creates a friendly name for a KMS key. You can use an alias to identify a KMS key in the KMS console, in the DescribeKey operation and in cryptographic operations, such as Encrypt and GenerateDataKey. You can also change the KMS key that's associated with the alias (UpdateAlias) or delete the alias (DeleteAlias) at any time. These operations don't affect the underlying KMS key.

You can associate the alias with any customer managed key in the same Amazon Web Services Region. Each alias is associated with only one KMS key at a time, but a KMS key can have multiple aliases. A valid KMS key is required. You can't create an alias without a KMS key.

The alias must be unique in the account and Region, but you can have aliases with the same name in different Regions. For detailed information about aliases, see Aliases in KMS in the Key Management Service Developer Guide.

This operation does not return a response. To get the alias that you created, use the ListAliases operation.

The KMS key that you use for this operation must be in a compatible key state. For details, see Key states of KMS keys in the Key Management Service Developer Guide.

Cross-account use: No. You cannot perform this operation on an alias in a different Amazon Web Services account.

Required permissions

• kms:CreateAlias on the alias (IAM policy).
• kms:CreateAlias on the KMS key (key policy).

For details, see Controlling access to aliases in the Key Management Service Developer Guide.

Related operations:

• DeleteAlias
• ListAliases
• UpdateAlias

Eventual consistency: The KMS API follows an eventual consistency model. For more information, see KMS eventual consistency.

May throw AlreadyExistsException. May throw DependencyTimeoutException. May throw InvalidAliasNameException. May throw KMSInternalException. May throw KMSInvalidStateException. May throw LimitExceededException. May throw NotFoundException.

Parameter aliasName : Specifies the alias name. This value must begin with alias/ followed by a name, such as alias/ExampleAlias. The AliasName value must be string of 1-256 characters. It can contain only alphanumeric characters, forward slashes (/), underscores (_), and dashes (-). The alias name cannot begin with alias/aws/. The alias/aws/ prefix is reserved for Amazon Web Services managed keys.

Parameter targetKeyId : Associates the alias with the specified customer managed key. The KMS key must be in the same Amazon Web Services Region.

A valid key ID is required. If you supply a null or empty string value, this operation returns an error.

For help finding the key ID and ARN, see Find the key ID and key ARN in the Key Management Service Developer Guide .

Specify the key ID or key ARN of the KMS key.

For example:

• Key ID: 1234abcd-12ab-34cd-56ef-1234567890ab
• Key ARN: arn:aws:kms:us-east-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab

To get the key ID and key ARN for a KMS key, use ListKeys or DescribeKey.

Implementation

Future<void> createAlias({
  required String aliasName,
  required String targetKeyId,
}) async {
  final headers = <String, String>{
    'Content-Type': 'application/x-amz-json-1.1',
    'X-Amz-Target': 'TrentService.CreateAlias'
  };
  await _protocol.send(
    method: 'POST',
    requestUri: '/',
    exceptionFnMap: _exceptionFns,
    // TODO queryParams
    headers: headers,
    payload: {
      'AliasName': aliasName,
      'TargetKeyId': targetKeyId,
    },
  );
}