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AWS Key Management Service
API Reference (API Version 2014-11-01)

CreateAlias

Creates a display name for a customer master key (CMK). You can use an alias to identify a CMK in selected operations, such as Encrypt and GenerateDataKey.

Each CMK can have multiple aliases, but each alias points to only one CMK. The alias name must be unique in the AWS account and region. To simplify code that runs in multiple regions, use the same alias name, but point it to a different CMK in each region.

Because an alias is not a property of a CMK, you can delete and change the aliases of a CMK without affecting the CMK. Also, aliases do not appear in the response from the DescribeKey operation. To get the aliases of all CMKs, use the ListAliases operation.

An alias must start with the word alias followed by a forward slash (alias/). The alias name can contain only alphanumeric characters, forward slashes (/), underscores (_), and dashes (-). Alias names cannot begin with aws; that alias name prefix is reserved by Amazon Web Services (AWS).

The alias and the CMK it is mapped to must be in the same AWS account and the same region. You cannot perform this operation on an alias in a different AWS account.

To map an existing alias to a different CMK, call UpdateAlias.

Request Syntax

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{ "AliasName": "string", "TargetKeyId": "string" }

Request Parameters

For information about the parameters that are common to all actions, see Common Parameters.

The request accepts the following data in JSON format.

Note

In the following list, the required parameters are described first.

AliasName

String that contains the display name. The name must start with the word "alias" followed by a forward slash (alias/). Aliases that begin with "alias/AWS" are reserved.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 256.

Pattern: ^[a-zA-Z0-9:/_-]+$

Required: Yes

TargetKeyId

Identifies the CMK for which you are creating the alias. This value cannot be an alias.

Specify the key ID or the Amazon Resource Name (ARN) of the CMK.

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 CMK, use ListKeys or DescribeKey.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 2048.

Required: Yes

Response Elements

If the action is successful, the service sends back an HTTP 200 response with an empty HTTP body.

Errors

For information about the errors that are common to all actions, see Common Errors.

AlreadyExistsException

The request was rejected because it attempted to create a resource that already exists.

HTTP Status Code: 400

DependencyTimeoutException

The system timed out while trying to fulfill the request. The request can be retried.

HTTP Status Code: 500

InvalidAliasNameException

The request was rejected because the specified alias name is not valid.

HTTP Status Code: 400

KMSInternalException

The request was rejected because an internal exception occurred. The request can be retried.

HTTP Status Code: 400

KMSInvalidStateException

The request was rejected because the state of the specified resource is not valid for this request.

For more information about how key state affects the use of a CMK, see How Key State Affects Use of a Customer Master Key in the AWS Key Management Service Developer Guide.

HTTP Status Code: 400

LimitExceededException

The request was rejected because a limit was exceeded. For more information, see Limits in the AWS Key Management Service Developer Guide.

HTTP Status Code: 400

NotFoundException

The request was rejected because the specified entity or resource could not be found.

HTTP Status Code: 400

Examples

Example Request

The following example is formatted for legibility.

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POST / HTTP/1.1 Host: kms.us-west-2.amazonaws.com Content-Length: 87 X-Amz-Target: TrentService.CreateAlias X-Amz-Date: 20160517T204220Z Content-Type: application/x-amz-json-1.1 Authorization: AWS4-HMAC-SHA256\ Credential=AKIAI44QH8DHBEXAMPLE/20160517/us-west-2/kms/aws4_request,\ SignedHeaders=content-type;host;x-amz-date;x-amz-target,\ Signature=ca7bcf1e8d5364dc3f0d881c05bdadf36f498c6c6a8b576a060142d9b2199123 { "TargetKeyId": "1234abcd-12ab-34cd-56ef-1234567890ab", "AliasName": "alias/ExampleAlias" }

Example Response

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HTTP/1.1 200 OK Server: Server Date: Tue, 17 May 2016 20:42:25 GMT Content-Type: application/x-amz-json-1.1 Content-Length: 0 Connection: keep-alive x-amzn-RequestId: dcb07ca7-1c6f-11e6-8540-77c363708b91

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: