Encrypts a data key by using a specific public key and exports the data key.

You can call the GenerateDataKeyWithoutPlaintext operation to generate a data key, which is encrypted by a CMK. If you want to distribute the data key to other regions or cryptographic modules, you can call the ExportDataKey operation to use a public key to encrypt the data key.

Then, you can import the ciphertext of the data key to the cryptographic module where the 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 it 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 ciphertext of the data key encrypted by using a CMK.
PublicKeyBlob String Yes MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAndKfC2ReLL2+y8a0+ZBBeAft/uBYo86GZiYJuflqgUzKxpyuvlo3uQkBv6b+nx+0tz8g8v7GhpPWMSW5L9mNHYsvYFsa7jTxsYdt17yj6GlUHPuMIs8hr5qbwl38IHU1iIa7nYWwE2fb3ePOvLDACRJVgGpU0yxioW80d2QD+9aU4jF5dlAahcfgsNzo2CXzCUc1+xbmNuq7Rp+H9VJB9dyYOwqnW3RhOLBo21FzpORapf0UiRlrHRpk1V6ez+aE1dofaYh/9bh0m6ioxj7j5hpZbWccuEZTMBKd+cbuBkRhJzc6Tti6qwZbDiu4fUwbZS0Tqpuo1UadiyxMW********

A Base64-encoded public key.
WrappingAlgorithm String Yes RSAES_OAEP_SHA_256

The encryption algorithm based on which you want to 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
WrappingKeySpec String Yes RSA_2048

The key type of the public key specified by PublicKeyBlob. For more information about key types, see Introduction to asymmetric keys.

Valid values:

  • RSA_2048
  • EC_SM2
EncryptionContext Json No {"Example":"Example"}

A JSON string that consists of key-value pairs. If you specify this parameter when you use a CMK to encrypt the data key, an equivalent value is required here. For more information, see EncryptionContext.

Response parameters

Parameter Type Example Description
ExportedDataKey String BQKP+1zK6+ZEMxTP5qaVzcsgXtWplYBKm0NXdSnB5FzliFxE1bSiu4dnEIlca2JpeH7yz1/S6fed630H+hIH6DoM25fTLNcKj+mFB0Xnh9m2+HN59Mn4qyTfcUeadnfCXSWcGBouhXFwcdd2rJ3n337bzTf4jm659gZu3L0i6PLuxM9p7mqdwO0cKJPfGVfhnfMz+f4alMg79WB/NNyE2lyX7/qxvV49ObNrrJbKSFiz8Djocaf0IESNLMbfYI5bXjWkJlX92DQbKhibtQW8ZOJ//ZC6t0AWcUoKL6QDm/dg5koQalcleRinpB+QadFm894sLbVZ9+N4GVs*******

The data key encrypted by using the public key and then exported.
KeyId String 202b9877-5a25-46e3-a763-e20791b5****

The ID of the CMK that is used to decrypt the specified ciphertext of the data key.

This parameter is the globally unique ID of the CMK.
KeyVersionId String 2ab1a983-7072-4bbc-a582-584b5bd8****

The ID of the CMK version that is used to decrypt the specified ciphertext of the data key.

RequestId String 4bd560a1-729e-45f1-a3d9-b2a33d61046b

The ID of the request.

Examples

Sample requests

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

Sample success responses

XML format 

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

JSON format 

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

Error codes

HTTP status code Error code Error message Description
500 InternalFailure Internal Failure. The error message returned because an internal error has occurred. Try again later. If the error persists, submit a ticket.

For a list of error codes, visit the API Error Center.