There are more AWS SDK examples available in the [AWS Doc SDK Examples](https://github.com/awsdocs/aws-doc-sdk-examples) GitHub repo.
# Use `DescribeKey` with an AWS SDK or CLI
The following code examples show how to use `DescribeKey`.
Action examples are code excerpts from larger programs and must be run in context. You can see this action in context in the following code example:
+ [Learn the basics](kms_example_kms_Scenario_Basics_section.md)
------
#### [ .NET ]
**SDK for .NET**
There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/dotnetv3/KMS#code-examples).
```
using System;
using System.Threading.Tasks;
using Amazon.KeyManagementService;
using Amazon.KeyManagementService.Model;
///
/// Retrieve information about an AWS Key Management Service (AWS KMS) key.
/// You can supply either the key Id or the key Amazon Resource Name (ARN)
/// to the DescribeKeyRequest KeyId property.
///
public class DescribeKey
{
public static async Task Main()
{
var keyId = "7c9eccc2-38cb-4c4f-9db3-766ee8dd3ad4";
var request = new DescribeKeyRequest
{
KeyId = keyId,
};
var client = new AmazonKeyManagementServiceClient();
var response = await client.DescribeKeyAsync(request);
var metadata = response.KeyMetadata;
Console.WriteLine($"{metadata.KeyId} created on: {metadata.CreationDate}");
Console.WriteLine($"State: {metadata.KeyState}");
Console.WriteLine($"{metadata.Description}");
}
}
```
+ For API details, see [DescribeKey](https://docs.aws.amazon.com/goto/DotNetSDKV3/kms-2014-11-01/DescribeKey) in *AWS SDK for .NET API Reference*.
------
#### [ CLI ]
**AWS CLI**
**Example 1: To find detailed information about a KMS key**
The following `describe-key` example gets detailed information about the AWS managed key for Amazon S3 in the example account and Region. You can use this command to find details about AWS managed keys and customer managed keys.
To specify the KMS key, use the `key-id` parameter. This example uses an alias name value, but you can use a key ID, key ARN, alias name, or alias ARN in this command.
```
aws kms describe-key \
--key-id alias/aws/s3
```
Output:
```
{
"KeyMetadata": {
"AWSAccountId": "846764612917",
"KeyId": "b8a9477d-836c-491f-857e-07937918959b",
"Arn": "arn:aws:kms:us-west-2:846764612917:key/b8a9477d-836c-491f-857e-07937918959b",
"CurrentKeyMaterialId": "0b7fd7ddbac6eef27907413567cad8c810e2883dc8a7534067a82ee1142fc1e6",
"CreationDate": 2017-06-30T21:44:32.140000+00:00,
"Enabled": true,
"Description": "Default KMS key that protects my S3 objects when no other key is defined",
"KeyUsage": "ENCRYPT_DECRYPT",
"KeyState": "Enabled",
"Origin": "AWS_KMS",
"KeyManager": "AWS",
"CustomerMasterKeySpec": "SYMMETRIC_DEFAULT",
"EncryptionAlgorithms": [
"SYMMETRIC_DEFAULT"
]
}
}
```
For more information, see [Viewing keys](https://docs.aws.amazon.com/kms/latest/developerguide/viewing-keys.html) in the *AWS Key Management Service Developer Guide*.
**Example 2: To get details about an RSA asymmetric KMS key**
The following `describe-key` example gets detailed information about an asymmetric RSA KMS key used for signing and verification.
```
aws kms describe-key \
--key-id 1234abcd-12ab-34cd-56ef-1234567890ab
```
Output:
```
{
"KeyMetadata": {
"AWSAccountId": "111122223333",
"KeyId": "1234abcd-12ab-34cd-56ef-1234567890ab",
"Arn": "arn:aws:kms:us-west-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab",
"CreationDate": "2019-12-02T19:47:14.861000+00:00",
"CustomerMasterKeySpec": "RSA_2048",
"Enabled": false,
"Description": "",
"KeyState": "Disabled",
"Origin": "AWS_KMS",
"MultiRegion": false,
"KeyManager": "CUSTOMER",
"KeySpec": "RSA_2048",
"KeyUsage": "SIGN_VERIFY",
"SigningAlgorithms": [
"RSASSA_PKCS1_V1_5_SHA_256",
"RSASSA_PKCS1_V1_5_SHA_384",
"RSASSA_PKCS1_V1_5_SHA_512",
"RSASSA_PSS_SHA_256",
"RSASSA_PSS_SHA_384",
"RSASSA_PSS_SHA_512"
]
}
}
```
**Example 3: To get details about a multi-Region replica key**
The following `describe-key` example gets metadata for a multi-Region replica key. This multi-Region key is a symmetric encryption key. The output of a `describe-key` command for any multi-Region key returns information about the primary key and all of its replicas.
```
aws kms describe-key \
--key-id arn:aws:kms:ap-northeast-1:111122223333:key/mrk-1234abcd12ab34cd56ef1234567890ab
```
Output:
```
{
"KeyMetadata": {
"MultiRegion": true,
"AWSAccountId": "111122223333",
"Arn": "arn:aws:kms:ap-northeast-1:111122223333:key/mrk-1234abcd12ab34cd56ef1234567890ab",
"CreationDate": "2021-06-28T21:09:16.114000+00:00",
"CurrentKeyMaterialId": "0b7fd7ddbac6eef27907413567cad8c810e2883dc8a7534067a82ee1142fc1e6",
"Description": "",
"Enabled": true,
"KeyId": "mrk-1234abcd12ab34cd56ef1234567890ab",
"KeyManager": "CUSTOMER",
"KeyState": "Enabled",
"KeyUsage": "ENCRYPT_DECRYPT",
"Origin": "AWS_KMS",
"CustomerMasterKeySpec": "SYMMETRIC_DEFAULT",
"EncryptionAlgorithms": [
"SYMMETRIC_DEFAULT"
],
"MultiRegionConfiguration": {
"MultiRegionKeyType": "PRIMARY",
"PrimaryKey": {
"Arn": "arn:aws:kms:us-west-2:111122223333:key/mrk-1234abcd12ab34cd56ef1234567890ab",
"Region": "us-west-2"
},
"ReplicaKeys": [
{
"Arn": "arn:aws:kms:eu-west-1:111122223333:key/mrk-1234abcd12ab34cd56ef1234567890ab",
"Region": "eu-west-1"
},
{
"Arn": "arn:aws:kms:ap-northeast-1:111122223333:key/mrk-1234abcd12ab34cd56ef1234567890ab",
"Region": "ap-northeast-1"
},
{
"Arn": "arn:aws:kms:sa-east-1:111122223333:key/mrk-1234abcd12ab34cd56ef1234567890ab",
"Region": "sa-east-1"
}
]
}
}
}
```
**Example 4: To get details about an HMAC KMS key**
The following `describe-key` example gets detailed information about an HMAC KMS key.
```
aws kms describe-key \
--key-id 1234abcd-12ab-34cd-56ef-1234567890ab
```
Output:
```
{
"KeyMetadata": {
"AWSAccountId": "123456789012",
"KeyId": "1234abcd-12ab-34cd-56ef-1234567890ab",
"Arn": "arn:aws:kms:us-west-2:123456789012:key/1234abcd-12ab-34cd-56ef-1234567890ab",
"CreationDate": "2022-04-03T22:23:10.194000+00:00",
"Enabled": true,
"Description": "Test key",
"KeyUsage": "GENERATE_VERIFY_MAC",
"KeyState": "Enabled",
"Origin": "AWS_KMS",
"KeyManager": "CUSTOMER",
"CustomerMasterKeySpec": "HMAC_256",
"MacAlgorithms": [
"HMAC_SHA_256"
],
"MultiRegion": false
}
}
```
+ For API details, see [DescribeKey](https://awscli.amazonaws.com/v2/documentation/api/latest/reference/kms/describe-key.html) in *AWS CLI Command Reference*.
------
#### [ Java ]
**SDK for Java 2.x**
There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javav2/example_code/kms#code-examples).
```
/**
* Asynchronously checks if a specified key is enabled.
*
* @param keyId the ID of the key to check
* @return a {@link CompletableFuture} that, when completed, indicates whether the key is enabled or not
*
* @throws RuntimeException if an exception occurs while checking the key state
*/
public CompletableFuture isKeyEnabledAsync(String keyId) {
DescribeKeyRequest keyRequest = DescribeKeyRequest.builder()
.keyId(keyId)
.build();
CompletableFuture responseFuture = getAsyncClient().describeKey(keyRequest);
return responseFuture.whenComplete((resp, ex) -> {
if (resp != null) {
KeyState keyState = resp.keyMetadata().keyState();
if (keyState == KeyState.ENABLED) {
logger.info("The key is enabled.");
} else {
logger.info("The key is not enabled. Key state: {}", keyState);
}
} else {
throw new RuntimeException(ex);
}
}).thenApply(resp -> resp.keyMetadata().keyState() == KeyState.ENABLED);
}
```
+ For API details, see [DescribeKey](https://docs.aws.amazon.com/goto/SdkForJavaV2/kms-2014-11-01/DescribeKey) in *AWS SDK for Java 2.x API Reference*.
------
#### [ Kotlin ]
**SDK for Kotlin**
There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/kotlin/services/kms#code-examples).
```
suspend fun describeSpecifcKey(keyIdVal: String?) {
val request =
DescribeKeyRequest {
keyId = keyIdVal
}
KmsClient.fromEnvironment { region = "us-west-2" }.use { kmsClient ->
val response = kmsClient.describeKey(request)
println("The key description is ${response.keyMetadata?.description}")
println("The key ARN is ${response.keyMetadata?.arn}")
}
}
```
+ For API details, see [DescribeKey](https://sdk.amazonaws.com/kotlin/api/latest/index.html) in *AWS SDK for Kotlin API reference*.
------
#### [ PHP ]
**SDK for PHP**
There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/php/example_code/kms#code-examples).
```
/***
* @param string $keyId
* @return array
*/
public function describeKey(string $keyId)
{
try {
$result = $this->client->describeKey([
"KeyId" => $keyId,
]);
return $result['KeyMetadata'];
}catch(KmsException $caught){
if($caught->getAwsErrorMessage() == "NotFoundException"){
echo "The request was rejected because the specified entity or resource could not be found.\n";
}
throw $caught;
}
}
```
+ For API details, see [DescribeKey](https://docs.aws.amazon.com/goto/SdkForPHPV3/kms-2014-11-01/DescribeKey) in *AWS SDK for PHP API Reference*.
------
#### [ Python ]
**SDK for Python (Boto3)**
There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/python/example_code/kms#code-examples).
```
class KeyManager:
def __init__(self, kms_client):
self.kms_client = kms_client
self.created_keys = []
@classmethod
def from_client(cls) -> "KeyManager":
"""
Creates a KeyManager instance with a default KMS client.
:return: An instance of KeyManager initialized with the default KMS client.
"""
kms_client = boto3.client("kms")
return cls(kms_client)
def describe_key(self, key_id: str) -> dict[str, any]:
"""
Describes a key.
:param key_id: The ARN or ID of the key to describe.
:return: Information about the key.
"""
try:
key = self.kms_client.describe_key(KeyId=key_id)["KeyMetadata"]
return key
except ClientError as err:
logging.error(
"Couldn't get key '%s'. Here's why: %s",
key_id,
err.response["Error"]["Message"],
)
raise
```
+ For API details, see [DescribeKey](https://docs.aws.amazon.com/goto/boto3/kms-2014-11-01/DescribeKey) in *AWS SDK for Python (Boto3) API Reference*.
------
#### [ SAP ABAP ]
**SDK for SAP ABAP**
There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/sap-abap/services/kms#code-examples).
```
TRY.
" iv_key_id = 'arn:aws:kms:us-east-1:123456789012:key/1234abcd-12ab-34cd-56ef-1234567890ab'
oo_result = lo_kms->describekey( iv_keyid = iv_key_id ).
DATA(lo_key) = oo_result->get_keymetadata( ).
MESSAGE 'Retrieved key information successfully.' TYPE 'I'.
CATCH /aws1/cx_kmsnotfoundexception.
MESSAGE 'Key not found.' TYPE 'E'.
CATCH /aws1/cx_kmskmsinternalex.
MESSAGE 'An internal error occurred.' TYPE 'E'.
ENDTRY.
```
+ For API details, see [DescribeKey](https://docs.aws.amazon.com/sdk-for-sap-abap/v1/api/latest/index.html) in *AWS SDK for SAP ABAP API reference*.
------