UpdateKeyDescription - AWS Key Management Service
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Updates the description of a customer master key (CMK). To see the description of a CMK, use DescribeKey.

The CMK that you use for this operation must be in a compatible key state. For details, see Key state: Effect on your CMK in the AWS Key Management Service Developer Guide.

Cross-account use: No. You cannot perform this operation on a CMK in a different AWS account.

Required permissions: kms:UpdateKeyDescription (key policy)

Related operations

Request Syntax

{ "Description": "string", "KeyId": "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.


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


New description for the CMK.

Type: String

Length Constraints: Minimum length of 0. Maximum length of 8192.

Required: Yes


Updates the description of the specified customer master key (CMK).

Specify the key ID or key 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.


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


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

HTTP Status Code: 500


The request was rejected because a specified ARN, or an ARN in a key policy, is not valid.

HTTP Status Code: 400


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

HTTP Status Code: 500


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


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

HTTP Status Code: 400


Example Request

The following example is formatted for legibility.

POST / HTTP/1.1 Host: kms.us-east-2.amazonaws.com Content-Length: 150 X-Amz-Target: TrentService.UpdateKeyDescription X-Amz-Date: 20161212T201249Z Content-Type: application/x-amz-json-1.1 Authorization: AWS4-HMAC-SHA256\ Credential=AKIAI44QH8DHBEXAMPLE/20161212/us-east-2/kms/aws4_request,\ SignedHeaders=content-type;host;x-amz-date;x-amz-target,\ Signature=cd81d09965e5df1156eb0416ec8b2e3f9dea9dbc4ca9285b472c319bcbbaec71 { "KeyId": "1234abcd-12ab-34cd-56ef-1234567890ab", "Description": "Example description that explains what this CMK is used for." }

Example Response

This example illustrates one usage of UpdateKeyDescription.

HTTP/1.1 200 OK Server: Server Date: Mon, 12 Dec 2016 20:12:50 GMT Content-Type: application/x-amz-json-1.1 Content-Length: 0 Connection: keep-alive x-amzn-RequestId: 5b089880-c0a7-11e6-89c4-3d6791a06780