replicateKey method

Future<ReplicateKeyResponse> replicateKey({
  1. required String keyId,
  2. required String replicaRegion,
  3. bool? bypassPolicyLockoutSafetyCheck,
  4. String? description,
  5. String? policy,
  6. List<Tag>? tags,
})

Replicates a multi-Region key into the specified Region. This operation creates a multi-Region replica key based on a multi-Region primary key in a different Region of the same Amazon Web Services partition. You can create multiple replicas of a primary key, but each must be in a different Region. To create a multi-Region primary key, use the CreateKey operation.

This operation supports multi-Region keys, an KMS feature that lets you create multiple interoperable KMS keys in different Amazon Web Services Regions. Because these KMS keys have the same key ID, key material, and other metadata, you can use them interchangeably to encrypt data in one Amazon Web Services Region and decrypt it in a different Amazon Web Services Region without re-encrypting the data or making a cross-Region call. For more information about multi-Region keys, see Multi-Region keys in KMS in the Key Management Service Developer Guide.

A replica key is a fully-functional KMS key that can be used independently of its primary and peer replica keys. A primary key and its replica keys share properties that make them interoperable. They have the same key ID and key material. They also have the same key spec, key usage, key material origin, and automatic key rotation status. KMS automatically synchronizes these shared properties among related multi-Region keys. All other properties of a replica key can differ, including its key policy, tags, aliases, and key state. KMS pricing and quotas for KMS keys apply to each primary key and replica key.

When this operation completes, the new replica key has a transient key state of Creating. This key state changes to Enabled (or PendingImport) after a few seconds when the process of creating the new replica key is complete. While the key state is Creating, you can manage key, but you cannot yet use it in cryptographic operations. If you are creating and using the replica key programmatically, retry on KMSInvalidStateException or call DescribeKey to check its KeyState value before using it. For details about the Creating key state, see Key states of KMS keys in the Key Management Service Developer Guide.

You cannot create more than one replica of a primary key in any Region. If the Region already includes a replica of the key you're trying to replicate, ReplicateKey returns an AlreadyExistsException error. If the key state of the existing replica is PendingDeletion, you can cancel the scheduled key deletion (CancelKeyDeletion) or wait for the key to be deleted. The new replica key you create will have the same shared properties as the original replica key.

The CloudTrail log of a ReplicateKey operation records a ReplicateKey operation in the primary key's Region and a CreateKey operation in the replica key's Region.

If you replicate a multi-Region primary key with imported key material, the replica key is created with no key material. You must import the same key material that you imported into the primary key.

To convert a replica key to a primary key, use the UpdatePrimaryRegion operation. Cross-account use: No. You cannot use this operation to create a replica key in a different Amazon Web Services account.

Required permissions:

  • kms:ReplicateKey on the primary key (in the primary key's Region). Include this permission in the primary key's key policy.
  • kms:CreateKey in an IAM policy in the replica Region.
  • To use the Tags parameter, kms:TagResource in an IAM policy in the replica Region.
Related operations Eventual consistency: The KMS API follows an eventual consistency model. For more information, see KMS eventual consistency.

May throw AlreadyExistsException. May throw DisabledException. May throw InvalidArnException. May throw KMSInternalException. May throw KMSInvalidStateException. May throw LimitExceededException. May throw MalformedPolicyDocumentException. May throw NotFoundException. May throw TagException. May throw UnsupportedOperationException.

Parameter keyId : Identifies the multi-Region primary key that is being replicated. To determine whether a KMS key is a multi-Region primary key, use the DescribeKey operation to check the value of the MultiRegionKeyType property.

Specify the key ID or key ARN of a multi-Region primary key.

For example:

  • Key ID: mrk-1234abcd12ab34cd56ef1234567890ab
  • Key ARN: arn:aws:kms:us-east-2:111122223333:key/mrk-1234abcd12ab34cd56ef1234567890ab
To get the key ID and key ARN for a KMS key, use ListKeys or DescribeKey.

Parameter replicaRegion : The Region ID of the Amazon Web Services Region for this replica key.

Enter the Region ID, such as us-east-1 or ap-southeast-2. For a list of Amazon Web Services Regions in which KMS is supported, see KMS service endpoints in the Amazon Web Services General Reference.

The replica must be in a different Amazon Web Services Region than its primary key and other replicas of that primary key, but in the same Amazon Web Services partition. KMS must be available in the replica Region. If the Region is not enabled by default, the Amazon Web Services account must be enabled in the Region. For information about Amazon Web Services partitions, see Amazon Resource Names (ARNs) in the Amazon Web Services General Reference. For information about enabling and disabling Regions, see Enabling a Region and Disabling a Region in the Amazon Web Services General Reference.

Parameter bypassPolicyLockoutSafetyCheck : Skips ("bypasses") the key policy lockout safety check. The default value is false.

For more information, see Default key policy in the Key Management Service Developer Guide. Use this parameter only when you intend to prevent the principal that is making the request from making a subsequent PutKeyPolicy request on the KMS key.

Parameter description : A description of the KMS key. The default value is an empty string (no description). The description is not a shared property of multi-Region keys. You can specify the same description or a different description for each key in a set of related multi-Region keys. KMS does not synchronize this property.

Parameter policy : The key policy to attach to the KMS key. This parameter is optional. If you do not provide a key policy, KMS attaches the default key policy to the KMS key.

The key policy is not a shared property of multi-Region keys. You can specify the same key policy or a different key policy for each key in a set of related multi-Region keys. KMS does not synchronize this property.

If you provide a key policy, it must meet the following criteria:

  • The key policy must allow the calling principal to make a subsequent PutKeyPolicy request on the KMS key. This reduces the risk that the KMS key becomes unmanageable. For more information, see Default key policy in the Key Management Service Developer Guide. (To omit this condition, set BypassPolicyLockoutSafetyCheck to true.)
  • Each statement in the key policy must contain one or more principals. The principals in the key policy must exist and be visible to KMS. When you create a new Amazon Web Services principal, you might need to enforce a delay before including the new principal in a key policy because the new principal might not be immediately visible to KMS. For more information, see Changes that I make are not always immediately visible in the Amazon Web Services Identity and Access Management User Guide.
A key policy document can include only the following characters:
  • Printable ASCII characters from the space character (\u0020) through the end of the ASCII character range.
  • Printable characters in the Basic Latin and Latin-1 Supplement character set (through \u00FF).
  • The tab (\u0009), line feed (\u000A), and carriage return (\u000D) special characters
For information about key policies, see Key policies in KMS in the Key Management Service Developer Guide. For help writing and formatting a JSON policy document, see the IAM JSON Policy Reference in the Identity and Access Management User Guide .

Parameter tags : Assigns one or more tags to the replica key. Use this parameter to tag the KMS key when it is created. To tag an existing KMS key, use the TagResource operation. To use this parameter, you must have kms:TagResource permission in an IAM policy.

Tags are not a shared property of multi-Region keys. You can specify the same tags or different tags for each key in a set of related multi-Region keys. KMS does not synchronize this property.

Each tag consists of a tag key and a tag value. Both the tag key and the tag value are required, but the tag value can be an empty (null) string. You cannot have more than one tag on a KMS key with the same tag key. If you specify an existing tag key with a different tag value, KMS replaces the current tag value with the specified one.

When you add tags to an Amazon Web Services resource, Amazon Web Services generates a cost allocation report with usage and costs aggregated by tags. Tags can also be used to control access to a KMS key. For details, see Tags in KMS.

Implementation

Future<ReplicateKeyResponse> replicateKey({
  required String keyId,
  required String replicaRegion,
  bool? bypassPolicyLockoutSafetyCheck,
  String? description,
  String? policy,
  List<Tag>? tags,
}) async {
  final headers = <String, String>{
    'Content-Type': 'application/x-amz-json-1.1',
    'X-Amz-Target': 'TrentService.ReplicateKey'
  };
  final jsonResponse = await _protocol.send(
    method: 'POST',
    requestUri: '/',
    exceptionFnMap: _exceptionFns,
    // TODO queryParams
    headers: headers,
    payload: {
      'KeyId': keyId,
      'ReplicaRegion': replicaRegion,
      if (bypassPolicyLockoutSafetyCheck != null)
        'BypassPolicyLockoutSafetyCheck': bypassPolicyLockoutSafetyCheck,
      if (description != null) 'Description': description,
      if (policy != null) 'Policy': policy,
      if (tags != null) 'Tags': tags,
    },
  );

  return ReplicateKeyResponse.fromJson(jsonResponse.body);
}