[ aws . kms ]

update-alias

Description

Associates an existing KMS alias with a different KMS key. Each alias is associated with only one KMS key at a time, although a KMS key can have multiple aliases. The alias and the KMS key must be in the same Amazon Web Services account and Region.

Note

Adding, deleting, or updating an alias can allow or deny permission to the KMS key. For details, see Using ABAC in KMS in the Key Management Service Developer Guide .

The current and new KMS key must be the same type (both symmetric or both asymmetric), and they must have the same key usage (ENCRYPT_DECRYPT or SIGN_VERIFY ). This restriction prevents errors in code that uses aliases. If you must assign an alias to a different type of KMS key, use DeleteAlias to delete the old alias and CreateAlias to create a new alias.

You cannot use UpdateAlias to change an alias name. To change an alias name, use DeleteAlias to delete the old alias and CreateAlias to create a new alias.

Because an alias is not a property of a KMS key, you can create, update, and delete the aliases of a KMS key without affecting the KMS key. Also, aliases do not appear in the response from the DescribeKey operation. To get the aliases of all KMS keys in the account, use the ListAliases operation.

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

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

Required permissions

• kms:UpdateAlias on the alias (IAM policy).

• kms:UpdateAlias on the current KMS key (key policy).

• kms:UpdateAlias on the new KMS key (key policy).

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

Related operations:

• CreateAlias

• DeleteAlias

• ListAliases

See also: AWS API Documentation

See ‘aws help’ for descriptions of global parameters.

Synopsis

  update-alias
--alias-name <value>
--target-key-id <value>
[--cli-input-json | --cli-input-yaml]
[--generate-cli-skeleton <value>]

Options

--alias-name (string)

Identifies the alias that is changing its KMS key. This value must begin with alias/ followed by the alias name, such as alias/ExampleAlias . You cannot use UpdateAlias to change the alias name.

--target-key-id (string)

Identifies the customer managed key to associate with the alias. You don’t have permission to associate an alias with an Amazon Web Services managed key .

The KMS key must be in the same Amazon Web Services account and Region as the alias. Also, the new target KMS key must be the same type as the current target KMS key (both symmetric or both asymmetric) and they must have the same key usage.

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 .

To verify that the alias is mapped to the correct KMS key, use ListAliases .

--cli-input-json | --cli-input-yaml (string) Reads arguments from the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, those values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally. This may not be specified along with --cli-input-yaml.

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. Similarly, if provided yaml-input it will print a sample input YAML that can be used with --cli-input-yaml. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command.

See ‘aws help’ for descriptions of global parameters.

Examples

To associate an alias with a different CMK

The following update-alias example associates the alias alias/test-key with a different CMK.

• The --alias-name parameter specifies the alias. The alias name value must begin with alias/.

• The --target-key-id parameter specifies the CMK to associate with the alias. You don’t need to specify the current CMK for the alias.

  aws kms update-alias \
      --alias-name alias/test-key \
      --target-key-id 1234abcd-12ab-34cd-56ef-1234567890ab
  

This command produces no output. To find the alias, use the list-aliases command.

For more information, see Working with Aliases in the AWS Key Management Service Developer Guide.

Output

None