Request Syntax Request Parameters Response Syntax Response Elements Errors Examples See Also

GetParametersForImport

Returns the public key and an import token you need to import or reimport key material for a KMS key.

By default, KMS keys are created with key material that AWS KMS generates. This operation supports Importing key material, an advanced feature that lets you generate and import the cryptographic key material for a KMS key.

Before calling GetParametersForImport, use the CreateKey operation with an Origin value of EXTERNAL to create a KMS key with no key material. You can import key material for a symmetric encryption KMS key, HMAC KMS key, asymmetric encryption KMS key, or asymmetric signing KMS key. You can also import key material into a multi-Region key of any supported type. However, you can't import key material into a KMS key in a custom key store. You can also use GetParametersForImport to get a public key and import token to reimport the original key material into a KMS key whose key material expired or was deleted.

GetParametersForImport returns the items that you need to import your key material.

The public key (or "wrapping key") of an RSA key pair that KMS generates.

You will use this public key to encrypt ("wrap") your key material while it's in transit to AWS KMS.
A import token that ensures that AWS KMS can decrypt your key material and associate it with the correct KMS key.

The public key and its import token are permanently linked and must be used together. Each public key and import token set is valid for 24 hours. The expiration date and time appear in the ParametersValidTo field in the GetParametersForImport response. You cannot use an expired public key or import token in an ImportKeyMaterial request. If your key and token expire, send another GetParametersForImport request.

GetParametersForImport requires the following information:

The key ID of the KMS key for which you are importing the key material.
The key spec of the public key ("wrapping key") that you will use to encrypt your key material during import.
The wrapping algorithm that you will use with the public key to encrypt your key material.

You can use the same or a different public key spec and wrapping algorithm each time you import or reimport the same key material.

The KMS key that you use for this operation must be in a compatible key state. For details, see Key states of AWS KMS keys in the AWS Key Management Service Developer Guide.

Cross-account use: No. You cannot perform this operation on a KMS key in a different AWS account.

Required permissions: kms:GetParametersForImport (key policy)

Related operations:

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

Request Syntax


{
   "KeyId": "string",
   "WrappingAlgorithm": "string",
   "WrappingKeySpec": "string"
}

Request Parameters

For information about the parameters that are common to all actions, see Common Parameters.

The request accepts the following data in JSON format.

Note

In the following list, the required parameters are described first.

KeyId

The identifier of the KMS key that will be associated with the imported key material. The Origin of the KMS key must be EXTERNAL.

All KMS key types are supported, including multi-Region keys. However, you cannot import key material into a KMS key in a custom key store.

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.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 2048.

Required: Yes

WrappingAlgorithm

The algorithm you will use with the RSA public key (PublicKey) in the response to protect your key material during import. For more information, see Select a wrapping algorithm in the AWS Key Management Service Developer Guide.

For RSA_AES wrapping algorithms, you encrypt your key material with an AES key that you generate, then encrypt your AES key with the RSA public key from AWS KMS. For RSAES wrapping algorithms, you encrypt your key material directly with the RSA public key from AWS KMS.

The wrapping algorithms that you can use depend on the type of key material that you are importing. To import an RSA private key, you must use an RSA_AES wrapping algorithm.

RSA_AES_KEY_WRAP_SHA_256 — Supported for wrapping RSA and ECC key material.
RSA_AES_KEY_WRAP_SHA_1 — Supported for wrapping RSA and ECC key material.
RSAES_OAEP_SHA_256 — Supported for all types of key material, except RSA key material (private key).

You cannot use the RSAES_OAEP_SHA_256 wrapping algorithm with the RSA_2048 wrapping key spec to wrap ECC_NIST_P521 key material.
RSAES_OAEP_SHA_1 — Supported for all types of key material, except RSA key material (private key).

You cannot use the RSAES_OAEP_SHA_1 wrapping algorithm with the RSA_2048 wrapping key spec to wrap ECC_NIST_P521 key material.
RSAES_PKCS1_V1_5 (Deprecated) — As of October 10, 2023, AWS KMS does not support the RSAES_PKCS1_V1_5 wrapping algorithm.

Type: String

Required: Yes

WrappingKeySpec

The type of RSA public key to return in the response. You will use this wrapping key with the specified wrapping algorithm to protect your key material during import.

Use the longest RSA wrapping key that is practical.

You cannot use an RSA_2048 public key to directly wrap an ECC_NIST_P521 private key. Instead, use an RSA_AES wrapping algorithm or choose a longer RSA public key.

Type: String

Valid Values: RSA_2048 | RSA_3072 | RSA_4096 | SM2

Required: Yes

Response Syntax


{
   "ImportToken": blob,
   "KeyId": "string",
   "ParametersValidTo": number,
   "PublicKey": blob
}

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.

ImportToken

The import token to send in a subsequent ImportKeyMaterial request.

Type: Base64-encoded binary data object

Length Constraints: Minimum length of 1. Maximum length of 6144.

KeyId

The Amazon Resource Name (key ARN) of the KMS key to use in a subsequent ImportKeyMaterial request. This is the same KMS key specified in the GetParametersForImport request.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 2048.

ParametersValidTo

The time at which the import token and public key are no longer valid. After this time, you cannot use them to make an ImportKeyMaterial request and you must send another GetParametersForImport request to get new ones.

Type: Timestamp

PublicKey

The public key to use to encrypt the key material before importing it with ImportKeyMaterial.

Type: Base64-encoded binary data object

Length Constraints: Minimum length of 1. Maximum length of 4096.

Errors

For information about the errors that are common to all actions, see Common Errors.

DependencyTimeoutException

The system timed out while trying to fulfill the request. You can retry the request.

HTTP Status Code: 500

InvalidArnException

The request was rejected because a specified ARN, or an ARN in a key policy, is not valid.

HTTP Status Code: 400

KMSInternalException

The request was rejected because an internal exception occurred. The request can be retried.

HTTP Status Code: 500

KMSInvalidStateException

The request was rejected because the state of the specified resource is not valid for this request.

This exceptions means one of the following:

The key state of the KMS key is not compatible with the operation.

To find the key state, use the DescribeKey operation. For more information about which key states are compatible with each AWS KMS operation, see Key states of AWS KMS keys in the AWS Key Management Service Developer Guide .
For cryptographic operations on KMS keys in custom key stores, this exception represents a general failure with many possible causes. To identify the cause, see the error message that accompanies the exception.

HTTP Status Code: 400

NotFoundException

The request was rejected because the specified entity or resource could not be found.

HTTP Status Code: 400

UnsupportedOperationException

The request was rejected because a specified parameter is not supported or a specified resource is not valid for this operation.

HTTP Status Code: 400

Examples

The following examples are formatted for legibility.

Example Request

This example illustrates one usage of GetParametersForImport.


POST / HTTP/1.1
Host: kms.us-east-2.amazonaws.com
Content-Length: 121
X-Amz-Target: TrentService.GetParametersForImport
X-Amz-Date: 20231130T225216Z
Content-Type: application/x-amz-json-1.1
Authorization: AWS4-HMAC-SHA256\
 Credential=AKIAI44QH8DHBEXAMPLE/20161130/us-east-2/kms/aws4_request,\
 SignedHeaders=content-type;host;x-amz-date;x-amz-target,\
 Signature=5bcc8e7669b6de719091ad27ae0145daa319f881010958208e960329341421d5

{
  "WrappingAlgorithm": "RSAES_OAEP_SHA_256",
  "KeyId": "1234abcd-12ab-34cd-56ef-1234567890ab",
  "WrappingKeySpec": "RSA_4096"
}

Example Response

This example illustrates one usage of GetParametersForImport.


HTTP/1.1 200 OK
Server: Server
Date: Wed, 30 Jul 2023 22:52:17 GMT
Content-Type: application/x-amz-json-1.1
Content-Length: 2892
Connection: keep-alive
x-amzn-RequestId: a46d61e0-b74f-11e6-b0c0-3343f53dee45

{
  "ImportToken": "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",
  "KeyId": "arn:aws:kms:us-east-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab",
  "ParametersValidTo": 1.480632737044E9,
  "PublicKey": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAvH3Yj0wbkLEpUl95Cv1cJVjsVNSjwGq3tCLnzXfhVwVvmzGN8pYj3U8nKwgouaHbBWNJYjP5VutbbkKS4Kv4GojwZBJyHN17kmxo8yTjRmjR15SKIQ8cqRA2uaERMLnpztIXdZp232PQPbWGxDyXYJ0aJ5EFSag+iSK341kr2kFTpINN7T1ZaX9vfXBdGR+VtkRKMWoHQeWzHrPZ+3irvpXNCKxGUxmPNsJSjPUhuSXT5+0VrY/LEYLQ5lUTrhU6z5/OK0kzaCc66DXc5ipSloS4Xyg+QcYSMxe9xuqO5HtzFImUSKBm1W6eDT6lHnSbpi7vXzNbIX7pWxKw9nmQvQIDAQAB"
}