Decrypting a DEK
Function
This API is used to decrypt DEKs using specified CMKs.
Calling Method
For details, see Calling APIs.
URI
POST /v1.0/{project_id}/kms/decrypt-datakey
Parameter |
Mandatory |
Type |
Description |
---|---|---|---|
project_id |
Yes |
String |
Project ID |
Request Parameters
Parameter |
Mandatory |
Type |
Description |
---|---|---|---|
X-Auth-Token |
Yes |
String |
User token. It can be obtained by calling the IAM API used to obtain a user token. The value of X-Subject-Token in the response header is the user token. |
Parameter |
Mandatory |
Type |
Description |
---|---|---|---|
key_id |
Yes |
String |
A 36-byte key ID which matches the regular expression ^[0-9a-z]{8}-[0-9a-z]{4}-[0-9a-z]{4}-[0-9a-z]{4}-[0-9a-z]{12}$, for example, 0d0466b0-e727-4d9c-b35d-f84bb474a37f. |
cipher_text |
Yes |
String |
Hexadecimal string of the DEK ciphertext and the metadata. It is the value of cipher_text in the encryption result. |
datakey_cipher_length |
Yes |
String |
Number of bytes of a key. The value ranges from 1 to 1024, for example, 64. |
additional_authenticated_data |
No |
String |
Non-sensitive extra data used for authentication. The value is a random string with at most 128 bytes. |
sequence |
No |
String |
A 36-byte serial number of a request message, for example, 919c82d4-8046-4722-9094-35c3c6524cff |
Response Parameters
Status code: 200
Parameter |
Type |
Description |
---|---|---|
data_key |
String |
Hexadecimal string of the plaintext of a DEK |
datakey_length |
String |
Length of a plaintext DEK, in bytes. |
datakey_dgst |
String |
Hexadecimal string corresponding to the SHA-256 hash value of the plaintext of a DEK. |
Status code: 400
Parameter |
Type |
Description |
---|---|---|
error |
Object |
Error message |
Parameter |
Type |
Description |
---|---|---|
error_code |
String |
Error code returned by the error request |
error_msg |
String |
Error information returned by the error request |
Status code: 401
Parameter |
Type |
Description |
---|---|---|
error |
Object |
Error message |
Parameter |
Type |
Description |
---|---|---|
error_code |
String |
Error code returned by the error request |
error_msg |
String |
Error information returned by the error request |
Status code: 403
Parameter |
Type |
Description |
---|---|---|
error |
Object |
Error message |
Parameter |
Type |
Description |
---|---|---|
error_code |
String |
Error code returned by the error request |
error_msg |
String |
Error information returned by the error request |
Status code: 404
Parameter |
Type |
Description |
---|---|---|
error |
Object |
Error message |
Parameter |
Type |
Description |
---|---|---|
error_code |
String |
Error code returned by the error request |
error_msg |
String |
Error information returned by the error request |
Status code: 500
Parameter |
Type |
Description |
---|---|---|
error |
Object |
Error message |
Parameter |
Type |
Description |
---|---|---|
error_code |
String |
Error code returned by the error request |
error_msg |
String |
Error information returned by the error request |
Status code: 502
Parameter |
Type |
Description |
---|---|---|
error |
Object |
Error message |
Parameter |
Type |
Description |
---|---|---|
error_code |
String |
Error code returned by the error request |
error_msg |
String |
Error information returned by the error request |
Status code: 504
Parameter |
Type |
Description |
---|---|---|
error |
Object |
Error message |
Parameter |
Type |
Description |
---|---|---|
error_code |
String |
Error code returned by the error request |
error_msg |
String |
Error information returned by the error request |
Example Requests
Decrypt a ciphertext DEK into a 64-byte plaintext DEK using the key whose ID is 0d0466b0-e727-4d9c-b35d-f84bb474a37f and add 123aad as the associated data.
{ "key_id" : "0d0466b0-e727-4d9c-b35d-f84bb474a37f", "cipher_text" : "020098005273E14E6E8E95F5463BECDC27E80AFxxxxxxxxxx...", "datakey_cipher_length" : "64", "additional_authenticated_data" : "123aad" }
Example Responses
Status code: 200
Request succeeded.
{ "data_key" : "000000e724d9cb35df84bb474a37fXXX...", "datakey_length" : "64", "datakey_dgst" : "F5A5FD42D16A20302798EF6ED3099XXX..." }
SDK Sample Code
The SDK sample code is as follows.
Decrypt a ciphertext DEK into a 64-byte plaintext DEK using the key whose ID is 0d0466b0-e727-4d9c-b35d-f84bb474a37f and add 123aad as the associated data.
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package com.huaweicloud.sdk.test; import com.huaweicloud.sdk.core.auth.ICredential; import com.huaweicloud.sdk.core.auth.BasicCredentials; import com.huaweicloud.sdk.core.exception.ConnectionException; import com.huaweicloud.sdk.core.exception.RequestTimeoutException; import com.huaweicloud.sdk.core.exception.ServiceResponseException; import com.huaweicloud.sdk.kms.v2.region.KmsRegion; import com.huaweicloud.sdk.kms.v2.*; import com.huaweicloud.sdk.kms.v2.model.*; public class DecryptDatakeySolution { public static void main(String[] args) { // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security. // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment String ak = System.getenv("CLOUD_SDK_AK"); String sk = System.getenv("CLOUD_SDK_SK"); String projectId = "{project_id}"; ICredential auth = new BasicCredentials() .withProjectId(projectId) .withAk(ak) .withSk(sk); KmsClient client = KmsClient.newBuilder() .withCredential(auth) .withRegion(KmsRegion.valueOf("<YOUR REGION>")) .build(); DecryptDatakeyRequest request = new DecryptDatakeyRequest(); DecryptDatakeyRequestBody body = new DecryptDatakeyRequestBody(); body.withAdditionalAuthenticatedData("123aad"); body.withDatakeyCipherLength("64"); body.withCipherText("020098005273E14E6E8E95F5463BECDC27E80AFxxxxxxxxxx..."); body.withKeyId("0d0466b0-e727-4d9c-b35d-f84bb474a37f"); request.withBody(body); try { DecryptDatakeyResponse response = client.decryptDatakey(request); System.out.println(response.toString()); } catch (ConnectionException e) { e.printStackTrace(); } catch (RequestTimeoutException e) { e.printStackTrace(); } catch (ServiceResponseException e) { e.printStackTrace(); System.out.println(e.getHttpStatusCode()); System.out.println(e.getRequestId()); System.out.println(e.getErrorCode()); System.out.println(e.getErrorMsg()); } } } |
Decrypt a ciphertext DEK into a 64-byte plaintext DEK using the key whose ID is 0d0466b0-e727-4d9c-b35d-f84bb474a37f and add 123aad as the associated data.
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# coding: utf-8 import os from huaweicloudsdkcore.auth.credentials import BasicCredentials from huaweicloudsdkkms.v2.region.kms_region import KmsRegion from huaweicloudsdkcore.exceptions import exceptions from huaweicloudsdkkms.v2 import * if __name__ == "__main__": # The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security. # In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment ak = os.environ["CLOUD_SDK_AK"] sk = os.environ["CLOUD_SDK_SK"] projectId = "{project_id}" credentials = BasicCredentials(ak, sk, projectId) client = KmsClient.new_builder() \ .with_credentials(credentials) \ .with_region(KmsRegion.value_of("<YOUR REGION>")) \ .build() try: request = DecryptDatakeyRequest() request.body = DecryptDatakeyRequestBody( additional_authenticated_data="123aad", datakey_cipher_length="64", cipher_text="020098005273E14E6E8E95F5463BECDC27E80AFxxxxxxxxxx...", key_id="0d0466b0-e727-4d9c-b35d-f84bb474a37f" ) response = client.decrypt_datakey(request) print(response) except exceptions.ClientRequestException as e: print(e.status_code) print(e.request_id) print(e.error_code) print(e.error_msg) |
Decrypt a ciphertext DEK into a 64-byte plaintext DEK using the key whose ID is 0d0466b0-e727-4d9c-b35d-f84bb474a37f and add 123aad as the associated data.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 |
package main import ( "fmt" "github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic" kms "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/kms/v2" "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/kms/v2/model" region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/kms/v2/region" ) func main() { // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security. // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment ak := os.Getenv("CLOUD_SDK_AK") sk := os.Getenv("CLOUD_SDK_SK") projectId := "{project_id}" auth := basic.NewCredentialsBuilder(). WithAk(ak). WithSk(sk). WithProjectId(projectId). Build() client := kms.NewKmsClient( kms.KmsClientBuilder(). WithRegion(region.ValueOf("<YOUR REGION>")). WithCredential(auth). Build()) request := &model.DecryptDatakeyRequest{} additionalAuthenticatedDataDecryptDatakeyRequestBody:= "123aad" request.Body = &model.DecryptDatakeyRequestBody{ AdditionalAuthenticatedData: &additionalAuthenticatedDataDecryptDatakeyRequestBody, DatakeyCipherLength: "64", CipherText: "020098005273E14E6E8E95F5463BECDC27E80AFxxxxxxxxxx...", KeyId: "0d0466b0-e727-4d9c-b35d-f84bb474a37f", } response, err := client.DecryptDatakey(request) if err == nil { fmt.Printf("%+v\n", response) } else { fmt.Println(err) } } |
For SDK sample code of more programming languages, see the Sample Code tab in API Explorer. SDK sample code can be automatically generated.
Status Codes
Status Code |
Description |
---|---|
200 |
Request succeeded. |
400 |
Invalid request parameters. |
401 |
Username and password are required for the requested page. |
403 |
Authentication failed. |
404 |
The resource does not exist. |
500 |
Internal service error. |
502 |
Failed to complete the request. The server receives an invalid response from the upstream server. |
504 |
Gateway timed out. |
Error Codes
See Error Codes.
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