ExportDataKey - Key Management Service - Alibaba Cloud Documentation Center

Usage notes

Keys outside Key Management Service (KMS) instances: To perform cryptographic operations, use Alibaba Cloud SDK to call operations.
Keys in KMS instances: To perform cryptographic operations, use one of the following methods:
- Method 1 (recommended): Use KMS Instance SDK to call KMS Instance API operations. For more information, see KMS Instance SDK and KMS Instance API.
- Method 2: Use Alibaba Cloud SDK to call operations. The authentication method supports only RAM roles whose trusted entities are Alibaba Cloud services. For more information, see Create a RAM role for a trusted Alibaba Cloud service.

QPS limits

You can call this operation up to 750 times per second per account. If the number of the calls per second exceeds the limit, throttling is triggered. As a result, your business may be affected. We recommend that you take note of the limit when you call this operation.

Description

Call the GenerateDataKeyWithoutPlaintext operation to obtain the data key that is encrypted and protected by using a key. If you want to distribute the data key to other regions or cryptographic modules, you can call the ExportDataKey operation to obtain the data key ciphertext that is encrypted by using the specified public key.

Then, you can import the data key ciphertext to the cryptographic module where the paired private key is stored. This way, the data key is securely distributed from KMS to the cryptographic module. After the data key is imported to the cryptographic module, you can use the data key to encrypt or decrypt data.

Debugging

OpenAPI Explorer automatically calculates the signature value. For your convenience, we recommend that you call this operation in OpenAPI Explorer. OpenAPI Explorer dynamically generates the sample code of the operation for different SDKs.

Request parameters

Parameter	Type	Required	Example	Description
Action	String	Yes	ExportDataKey	The operation that you want to perform. Set the value to ExportDataKey.
CiphertextBlob	String	Yes	ODZhOWVmZDktM2QxNi00ODk0LWJkNGYtMWZjNDNmM2YyYWJmS7FmDBBQ0BkKsQrtRnidtPwirmDcS0ZuJCU41xxAAWk4Z8qsADfbV0b+i6kQmlvj79dJdGOvtX69Uycs901q********	The data key ciphertext that is encrypted by using a key.
EncryptionContext	Map	No	{"Example":"Example"}	The JSON string that consists of key-value pairs. The parameter specifies the encryption context. For more information, see EncryptionContext.
PublicKeyBlob	String	Yes	MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAndKfC2ReLL2+y8a0+ZBBeAft/uBYo86GZiYJuflqgUzKxpyuvlo3uQkBv6b+nx+0tz8g8v7GhpPWMSW5L9mNHYsvYFsa7jTxsYdt17yj6GlUHPuMIs8hr5qbwl38IHU1iIa7nYWwE2fb3ePOvLDACRJVgGpU0yxioW80d2QD+9aU4jF5dlAahcfgsNzo2CXzCUc1+xbmNuq7Rp+H9VJB9dyYOwqnW3RhOLBo21FzpORapf0UiRlrHRpk1V6ez+aE1dofaYh/9bh0m6ioxj7j5hpZbWccuEZTMBKd+cbuBkRhJzc6Tti6qwZbDiu4fUwbZS0Tqpuo1UadiyxMW********	A Base64-encoded public key.
WrappingKeySpec	String	Yes	RSA_2048	The key type of the public key that is specified by PublicKeyBlob. For more information about key types, see Introduction to asymmetric keys. Valid values: RSA_2048 EC_SM2
WrappingAlgorithm	String	Yes	RSAES_OAEP_SHA_256	The encryption algorithm based on which you use the public key specified by PublicKeyBlob to encrypt the data key. For more information about encryption algorithms, see AsymmetricDecrypt. Valid values: RSAES_OAEP_SHA_256 RSAES_OAEP_SHA_1 SM2PKE

Response parameters

Parameter	Type	Example	Description
KeyVersionId	String	2ab1a983-7072-4bbc-a582-584b5bd8****	The version ID of the key that is used to decrypt the data key ciphertext.
KeyId	String	202b9877-5a25-46e3-a763-e20791b5****	The ID of the key that is used to decrypt the data key ciphertext. The ID must be globally unique.
RequestId	String	4bd560a1-729e-45f1-a3d9-b2a33d61046b	The ID of the request.
ExportedDataKey	String	BQKP+1zK6+ZEMxTP5qaVzcsgXtWplYBKm0NXdSnB5FzliFxE1bSiu4dnEIlca2JpeH7yz1/S6fed630H+hIH6DoM25fTLNcKj+mFB0Xnh9m2+HN59Mn4qyTfcUeadnfCXSWcGBouhXFwcdd2rJ3n337bzTf4jm659gZu3L0i6PLuxM9p7mqdwO0cKJPfGVfhnfMz+f4alMg79WB/NNyE2lyX7/qxvV49ObNrrJbKSFiz8Djocaf0IESNLMbfYI5bXjWkJlX92DQbKhibtQW8ZOJ//ZC6t0AWcUoKL6QDm/dg5koQalcleRinpB+QadFm894sLbVZ9+N4GVs*******	The data key that is encrypted by using the public key.

Examples

Sample requests

http(s)://[Endpoint]/?Action=ExportDataKey
&CiphertextBlob=ODZhOWVmZDktM2QxNi00ODk0LWJkNGYtMWZjNDNmM2YyYWJmS7FmDBBQ0BkKsQrtRnidtPwirmDcS0ZuJCU41xxAAWk4Z8qsADfbV0b+i6kQmlvj79dJdGOvtX69Uycs901q********
&PublicKeyBlob=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAndKfC2ReLL2+y8a0+ZBBeAft/uBYo86GZiYJuflqgUzKxpyuvlo3uQkBv6b+nx+0tz8g8v7GhpPWMSW5L9mNHYsvYFsa7jTxsYdt17yj6GlUHPuMIs8hr5qbwl38IHU1iIa7nYWwE2fb3ePOvLDACRJVgGpU0yxioW80d2QD+9aU4jF5dlAahcfgsNzo2CXzCUc1+xbmNuq7Rp+H9VJB9dyYOwqnW3RhOLBo21FzpORapf0UiRlrHRpk1V6ez+aE1dofaYh/9bh0m6ioxj7j5hpZbWccuEZTMBKd+cbuBkRhJzc6Tti6qwZbDiu4fUwbZS0Tqpuo1UadiyxMW********
&WrappingKeySpec=RSA_2048
&WrappingAlgorithm=RSAES_OAEP_SHA_256
&Common request parameters

Sample success responses

XML format

HTTP/1.1 200 OK
Content-Type:application/xml

<ExportDataKeyResponse>
    <KeyVersionId>2ab1a983-7072-4bbc-a582-584b5bd8****</KeyVersionId>
    <KeyId>202b9877-5a25-46e3-a763-e20791b5****</KeyId>
    <RequestId>4bd560a1-729e-45f1-a3d9-b2a33d61046b</RequestId>
    <ExportedDataKey>BQKP+1zK6+ZEMxTP5qaVzcsgXtWplYBKm0NXdSnB5FzliFxE1bSiu4dnEIlca2JpeH7yz1/S6fed630H+hIH6DoM25fTLNcKj+mFB0Xnh9m2+HN59Mn4qyTfcUeadnfCXSWcGBouhXFwcdd2rJ3n337bzTf4jm659gZu3L0i6PLuxM9p7mqdwO0cKJPfGVfhnfMz+f4alMg79WB/NNyE2lyX7/qxvV49ObNrrJbKSFiz8Djocaf0IESNLMbfYI5bXjWkJlX92DQbKhibtQW8ZOJ//ZC6t0AWcUoKL6QDm/dg5koQalcleRinpB+QadFm894sLbVZ9+N4GVs*******</ExportedDataKey>
</ExportDataKeyResponse>

JSON format

HTTP/1.1 200 OK
Content-Type:application/json

{
  "KeyVersionId" : "2ab1a983-7072-4bbc-a582-584b5bd8****",
  "KeyId" : "202b9877-5a25-46e3-a763-e20791b5****",
  "RequestId" : "4bd560a1-729e-45f1-a3d9-b2a33d61046b",
  "ExportedDataKey" : "BQKP+1zK6+ZEMxTP5qaVzcsgXtWplYBKm0NXdSnB5FzliFxE1bSiu4dnEIlca2JpeH7yz1/S6fed630H+hIH6DoM25fTLNcKj+mFB0Xnh9m2+HN59Mn4qyTfcUeadnfCXSWcGBouhXFwcdd2rJ3n337bzTf4jm659gZu3L0i6PLuxM9p7mqdwO0cKJPfGVfhnfMz+f4alMg79WB/NNyE2lyX7/qxvV49ObNrrJbKSFiz8Djocaf0IESNLMbfYI5bXjWkJlX92DQbKhibtQW8ZOJ//ZC6t0AWcUoKL6QDm/dg5koQalcleRinpB+QadFm894sLbVZ9+N4GVs*******"
}

Error codes

HTTP status code	Error code	Error message	Description
400	InvalidParameter	The specified parameter is not valid.	The specified parameter is invalid.
500	InternalFailure	Internal Failure.	An internal error occurred. Try again later. If the error persists, submit a ticket.

For a list of error codes, see Service error codes.