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GenerateDataKey

Last updated: 2022-01-18 17:21:46

1. API Description

Domain name for API request: kms.tencentcloudapi.com.

This API generates a data key, which you can use to encrypt local data.

A maximum of 100 requests can be initiated per second for this API.

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2. Input Parameters

The following request parameter list only provides API request parameters and some common parameters. For the complete common parameter list, see Common Request Parameters.
This document describes the parameters for Signature V1. It's recommended to use the V3 signature, which provides higher security. Note that for Signature V3, the common parameters need to be placed in the HTTP Header. See details.

Parameter Name Required Type Description
Action Yes String Common parameter. The value used for this API: GenerateDataKey.
Version Yes String Common parameter. The value used for this API: 2019-01-18.
Region Yes String Common parameter. For more information, please see the list of regions supported by the product.
KeyId Yes String Globally unique CMK ID
KeySpec No String Specifies the encryption algorithm and size of the DataKey. Valid values: AES_128, AES_256. Either KeySpec or NumberOfBytes must be specified.
NumberOfBytes No Integer Length of the DataKey. If both NumberOfBytes and KeySpec are specified, NumberOfBytes will prevail. Minimum value: 1; maximum value: 1024. Either KeySpec or NumberOfBytes must be specified.
EncryptionContext No String JSON string of key-value pair. If this field is used, the same string should be entered when the returned DataKey is decrypted.
EncryptionPublicKey No String PEM-encoded public key (2048-bit RSA/SM2 key), which can be used to encrypt the Plaintext returned. If this field is left empty, the Plaintext will not be encrypted.
EncryptionAlgorithm No String Asymmetric encryption algorithm. Valid values: SM2(C1C3C2), RSAES_PKCS1_V1_5, RSAES_OAEP_SHA_1, and RSAES_OAEP_SHA_256. This field is used with EncryptionPublicKey for encryption. If it is left empty, a SM2 public key will be used by default.

3. Output Parameters

Parameter Name Type Description
KeyId String Globally unique CMK ID
Plaintext String If EncryptionPublicKey is left empty, a Base64-encoded ciphertext will be returned. To get the plaintext, you need to decode the ciphertext first.
If EncryptionPublicKey is specified, this field will return the Base64-encoded ciphertext encrypted with the specified public key. To get the plaintext, you need to decode the ciphertext and upload the corresponding private key.
CiphertextBlob String Ciphertext of the data key, which should be kept by yourself. KMS does not host user data keys. You can call the Decrypt API to get the plaintext of the data key from CiphertextBlob.
RequestId String The unique request ID, which is returned for each request. RequestId is required for locating a problem.

4. Example

Example1 Generating a DEK

This example shows you how to generate a DEK using the specified CMK.

Input Example

https://kms.tencentcloudapi.com/?Action=GenerateDataKey
&KeyId=23e80852-1e38-11e9-b129-5cb9019b4b01
&KeySpec=AES_256
&<Common request parameters>

Output Example

{
  "Response": {
    "RequestId": "fe11aa29-0cc2-4204-bfea-6ebb30cc00d7",
    "KeyId": "23e80852-1e38-11e9-b129-5cb9019b4b01",
    "Plaintext": "uW9wqntw+FAgnfsIrxOpOA==",
    "CiphertextBlob": "g2F8eQk44QrTbfj09TL17AZyFPgs8BTtZe2j27Wuw1YzTBCxnd0T/gwFQSasmtzxZi6mmvD7DCjCE+LxJmdhXQ==-k-fKVP3WIlGpg8m9LMW4jEkQ==-k-h/nUfRbaTUY7/KWXwuSK1Py+ZFRTK5WQiUz6yQE5XBFUN3UwPOUbl8P3A3caow2rlqTjUw=="
  }
}

5. Developer Resources

SDK

TencentCloud API 3.0 integrates SDKs that support various programming languages to make it easier for you to call APIs.

Command Line Interface

6. Error Code

The following only lists the error codes related to the API business logic. For other error codes, see Common Error Codes.

Error Code Description
FailedOperation.EncryptionError Encryption failed.
InternalError Internal error.
InvalidParameter Invalid parameter.
InvalidParameterValue.InvalidKeyId Invalid KeyId.
ResourceUnavailable.CmkDisabled The CMK has been disabled.
ResourceUnavailable.CmkNotFound The CMK does not exist.
ResourceUnavailable.KeyPendingDelete The key is not available as it’s pending deleted.
UnauthorizedOperation Unauthorized operation.
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