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Returns usage information about the last successful cryptographic operation performed with a specified KMS key, including the operation type, timestamp, and associated CloudTrail event ID.
The TrackingStartDate in the GetKeyLastUsage response indicates the
date from which KMS began recording cryptographic activity for a given key. Use this
value together with KeyCreationDate to understand the key's usage history:
If the KeyLastUsage response element is present, the key has been used
for a successful cryptographic operation since the TrackingStartDate. The response
includes the operation type, timestamp, and associated CloudTrail event ID.
If the KeyLastUsage response element is empty and KeyCreationDate
is on or after TrackingStartDate, the key has not been used for a successful
cryptographic operation since it was created.
If the KeyLastUsage response element is empty and KeyCreationDate
is before TrackingStartDate, there is no record of the key being used for a
successful cryptographic operation since the TrackingStartDate. However, the
key may have been used before tracking began. To determine whether the key was used
before the TrackingStartDate, examine your past CloudTrail logs.
For multi-Region KMS keys, primary and replica keys track last usage independently. Each key in a multi-Region key set maintains its own usage information.
The ReEncrypt operation uses two keys: a source key for decryption and a destination
key for encryption. Usage information is recorded for both keys independently, each
with the CloudTrail event ID from the respective key owner's account.
Do not use GetKeyLastUsage as the sole indicator when scheduling a key for
deletion. Instead, first disable
the key and monitor CloudTrail for DisabledException entries, as there
could be infrequent workflows that are dependent on the key. By looking for this exception,
you can identify potential dependencies and workload failures before they occur.
Cross-account use: No. You cannot perform this operation on a KMS key in a different Amazon Web Services account.
Required permissions: kms:GetKeyLastUsage (key policy)
Related operations:
Eventual consistency: The KMS API follows an eventual consistency model. For more information, see KMS eventual consistency.
For .NET Core this operation is only available in asynchronous form. Please refer to GetKeyLastUsageAsync.
Namespace: Amazon.KeyManagementService
Assembly: AWSSDK.KeyManagementService.dll
Version: 3.x.y.z
public virtual GetKeyLastUsageResponse GetKeyLastUsage( GetKeyLastUsageRequest request )
Container for the necessary parameters to execute the GetKeyLastUsage service method.
| Exception | Condition |
|---|---|
| DependencyTimeoutException | The system timed out while trying to fulfill the request. You can retry the request. |
| InvalidArnException | The request was rejected because a specified ARN, or an ARN in a key policy, is not valid. |
| KMSInternalException | The request was rejected because an internal exception occurred. The request can be retried. |
| NotFoundException | The request was rejected because the specified entity or resource could not be found. |
The following example retrieves usage information about the last successful cryptographic operation performed with the specified KMS key, including the operation type, timestamp, and associated AWS CloudTrail event ID.
var client = new AmazonKeyManagementServiceClient();
var response = client.GetKeyLastUsage(new GetKeyLastUsageRequest
{
KeyId = "1234abcd-12ab-34cd-56ef-1234567890ab" // The identifier of the KMS key to get usage information for. You can use the key ID or the Amazon Resource Name (ARN) of the KMS key. Alias names are not supported.
});
DateTime keyCreationDate = response.KeyCreationDate; // The date and time when the KMS key was created.
string keyId = response.KeyId; // The globally unique identifier for the KMS key.
KeyLastUsageData keyLastUsage = response.KeyLastUsage; // Contains usage information about the last time the KMS key was used for a successful cryptographic operation.
DateTime trackingStartDate = response.TrackingStartDate; // The date from which AWS KMS began recording cryptographic activity for this key, or the date the KMS key was created, whichever is later.
.NET Framework:
Supported in: 4.7.2 and newer