Uso de CreateGrant con un AWS SDK o una CLI

        public static async Task Main()
        {
            var client = new AmazonKeyManagementServiceClient();

            // The identity that is given permission to perform the operations
            // specified in the grant.
            var grantee = "arn:aws:iam::111122223333:role/ExampleRole";

            // The identifier of the AWS KMS key to which the grant applies. You
            // can use the key ID or the Amazon Resource Name (ARN) of the KMS key.
            var keyId = "7c9eccc2-38cb-4c4f-9db3-766ee8dd3ad4";

            var request = new CreateGrantRequest
            {
                GranteePrincipal = grantee,
                KeyId = keyId,

                // A list of operations that the grant allows.
                Operations = new List<string>
                {
                    "Encrypt",
                    "Decrypt",
                },
            };

            var response = await client.CreateGrantAsync(request);

            string grantId = response.GrantId; // The unique identifier of the grant.
            string grantToken = response.GrantToken; // The grant token.

            Console.WriteLine($"Id: {grantId}, Token: {grantToken}");
        }
    }

Creación de una concesión

En el siguiente ejemplo de create-grant se crea una concesión que permite al usuario exampleUser utilizar el comando decrypt de la clave de KMS del ejemplo 1234abcd-12ab-34cd-56ef-1234567890ab. La entidad principal que se va a dar de baja es el rol adminRole. La concesión utiliza la limitación de concesión EncryptionContextSubset para permitir este permiso solo cuando el contexto de cifrado de la solicitud decrypt incluye un par clave-valor "Department": "IT".

aws kms create-grant \
    --key-id 1234abcd-12ab-34cd-56ef-1234567890ab \
    --grantee-principal arn:aws:iam::123456789012:user/exampleUser \
    --operations Decrypt \
    --constraints EncryptionContextSubset={Department=IT} \
    --retiring-principal arn:aws:iam::123456789012:role/adminRole

Salida:

{
    "GrantId": "1a2b3c4d2f5e69f440bae30eaec9570bb1fb7358824f9ddfa1aa5a0dab1a59b2",
    "GrantToken": "<grant token here>"
}

Para ver información detallada sobre la concesión, utilice el comando list-grants.

Para obtener más información, consulte Concesiones en AWS KMS en la Guía para desarrolladores de AWS Key Management Service.

    /**
     * Grants permissions to a specified principal on a customer master key (CMK) asynchronously.
     *
     * @param keyId             The unique identifier for the customer master key (CMK) that the grant applies to.
     * @param granteePrincipal  The principal that is given permission to perform the operations that the grant permits on the CMK.
     * @return A {@link CompletableFuture} that, when completed, contains the ID of the created grant.
     * @throws RuntimeException If an error occurs during the grant creation process.
     */
    public CompletableFuture<String> grantKeyAsync(String keyId, String granteePrincipal) {
        List<GrantOperation> grantPermissions = List.of(
            GrantOperation.ENCRYPT,
            GrantOperation.DECRYPT,
            GrantOperation.DESCRIBE_KEY
        );

        CreateGrantRequest grantRequest = CreateGrantRequest.builder()
            .keyId(keyId)
            .name("grant1")
            .granteePrincipal(granteePrincipal)
            .operations(grantPermissions)
            .build();

        CompletableFuture<CreateGrantResponse> responseFuture = getAsyncClient().createGrant(grantRequest);
        responseFuture.whenComplete((response, ex) -> {
            if (ex == null) {
                logger.info("Grant created successfully with ID: " + response.grantId());
            } else {
                if (ex instanceof KmsException kmsEx) {
                    throw new RuntimeException("Failed to create grant: " + kmsEx.getMessage(), kmsEx);
                } else {
                    throw new RuntimeException("An unexpected error occurred: " + ex.getMessage(), ex);
                }
            }
        });

        return responseFuture.thenApply(CreateGrantResponse::grantId);
    }

suspend fun createNewGrant(
    keyIdVal: String?,
    granteePrincipalVal: String?,
    operation: String,
): String? {
    val operationOb = GrantOperation.fromValue(operation)
    val grantOperationList = ArrayList<GrantOperation>()
    grantOperationList.add(operationOb)

    val request =
        CreateGrantRequest {
            keyId = keyIdVal
            granteePrincipal = granteePrincipalVal
            operations = grantOperationList
        }

    KmsClient { region = "us-west-2" }.use { kmsClient ->
        val response = kmsClient.createGrant(request)
        return response.grantId
    }
}

    /***
     * @param string $keyId
     * @param string $granteePrincipal
     * @param array $operations
     * @param array $grantTokens
     * @return Result
     */
    public function createGrant(string $keyId, string $granteePrincipal, array $operations, array $grantTokens = [])
    {
        $args = [
            'KeyId' => $keyId,
            'GranteePrincipal' => $granteePrincipal,
            'Operations' => $operations,
        ];
        if($grantTokens){
            $args['GrantTokens'] = $grantTokens;
        }
        try{
            return $this->client->createGrant($args);
        }catch(KmsException $caught){
            if($caught->getAwsErrorMessage() == "InvalidGrantTokenException"){
                echo "The request was rejected because the specified grant token is not valid.\n";
            }
            throw $caught;
        }
    }

class GrantManager:
    def __init__(self, kms_client):
        self.kms_client = kms_client

    @classmethod
    def from_client(cls) -> "GrantManager":
        """
        Creates a GrantManager instance with a default KMS client.

        :return: An instance of GrantManager initialized with the default KMS client.
        """
        kms_client = boto3.client("kms")
        return cls(kms_client)


    def create_grant(
        self, key_id: str, principal: str, operations: [str]
    ) -> dict[str, str]:
        """
        Creates a grant for a key that lets a principal generate a symmetric data
        encryption key.

        :param key_id: The ARN or ID of the key.
        :param principal: The principal to grant permission to.
        :param operations: The operations to grant permission for.
        :return: The grant that is created.
        """
        try:
            return self.kms_client.create_grant(
                KeyId=key_id,
                GranteePrincipal=principal,
                Operations=operations,
            )
        except ClientError as err:
            logger.error(
                "Couldn't create a grant on key %s. Here's why: %s",
                key_id,
                err.response["Error"]["Message"],
            )
            raise