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get_key_last_usage

Operation

get_key_last_usage async 

get_key_last_usage(input: GetKeyLastUsageInput, plugins: list[Plugin] | None = None) -> GetKeyLastUsageOutput

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.

Note

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. CloudTrail remains the authoritative source for all API calls made to your key.

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:

  • DescribeKey

  • DisableKey

  • ScheduleKeyDeletion

Eventual consistency: The KMS API follows an eventual consistency model. For more information, see KMS eventual consistency.

Parameters:

Name Type Description Default
input GetKeyLastUsageInput

An instance of GetKeyLastUsageInput.

 required
plugins list[Plugin] | None

A list of callables that modify the configuration dynamically. Changes made by these plugins only apply for the duration of the operation execution and will not affect any other operation invocations.

 None

Returns:

Type Description
GetKeyLastUsageOutput

An instance of GetKeyLastUsageOutput.

Input

GetKeyLastUsageInput dataclass

Bases: _SerdeShape

Dataclass for GetKeyLastUsageInput structure.

Attributes

key_id class-attribute instance-attribute 
key_id: str | None = ...

Identifies the KMS key to get usage information for. To specify a KMS key, use its key ID or key ARN. Alias names are not supported.

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.

Output

GetKeyLastUsageOutput dataclass

Bases: _SerdeShape

Dataclass for GetKeyLastUsageOutput structure.

Attributes

key_creation_date class-attribute instance-attribute 
key_creation_date: datetime | None = ...

The date and time when the KMS key was created.

key_id class-attribute instance-attribute 
key_id: str | None = ...

The globally unique identifier for the KMS key.

key_last_usage class-attribute instance-attribute 
key_last_usage: KeyLastUsageData | None = ...

Contains usage information about the last time the KMS key was used for a successful cryptographic operation. If the key has not been used since tracking began, this response element is an empty object.

response_metadata class-attribute instance-attribute 
response_metadata: ResponseMetadata = ...

Metadata about the response that produced this output. Use this to recover the request identifiers a service's support team needs in order to investigate a call. Members of the metadata are individually optional.

tracking_start_date class-attribute instance-attribute 
tracking_start_date: datetime | None = ...

The date from which KMS began recording cryptographic activity for this key, or the date the KMS key was created, whichever is later.