Updated on 2025-08-08 GMT+08:00

Verifying a Signature

Function

This API is used to verify the signature of a message or digest using the public key of an asymmetric key.

Constraints

Only the asymmetric key whose key_usage is SIGN_VERIFY can be used for signature verification.

SM2 keys can only be used to sign message digests.

Calling Method

For details, see Calling APIs.

URI

POST /v1.0/{project_id}/kms/verify

Table 1 Path Parameters

Parameter

Mandatory

Type

Description

project_id

Yes

String

Project ID

Request Parameters

Table 2 Request header 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.

Table 3 Request body parameters

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.

message

Yes

String

Message digest or message to be signed. The message must be smaller than 4,096 bytes and in Base64 format.

signature

Yes

String

Value of signature to be valued, which is in Base64 format.

signing_algorithm

Yes

String

Signature algorithm. Possible values are as follows:

RSASSA_PSS_SHA_256

RSASSA_PSS_SHA_384

RSASSA_PSS_SHA_512

RSASSA_PKCS1_V1_5_SHA_256

RSASSA_PKCS1_V1_5_SHA_384

RSASSA_PKCS1_V1_5_SHA_512

ECDSA_SHA_256

ECDSA_SHA_384

ECDSA_SHA_512

SM2DSA_SM3

message_type

No

String

Message type. The default value is DIGEST. Possible values are as follows:

DIGEST: message digest

RAW: message

sequence

No

String

A 36-byte serial number of a request message, for example, 919c82d4-8046-4722-9094-35c3c6524cff

Response Parameters

Status code: 200

Table 4 Response body parameters

Parameter

Type

Description

key_id

String

Key ID

signature_valid

String

Whether the verification signature is valid.

true: The signature is valid.

false: The signature is invalid.

Status code: 400

Table 5 Response body parameters

Parameter

Type

Description

error

Object

Error message

Table 6 ErrorDetail

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

Table 7 Response body parameters

Parameter

Type

Description

error

Object

Error message

Table 8 ErrorDetail

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

Table 9 Response body parameters

Parameter

Type

Description

error

Object

Error message

Table 10 ErrorDetail

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

Table 11 Response body parameters

Parameter

Type

Description

error

Object

Error message

Table 12 ErrorDetail

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

Table 13 Response body parameters

Parameter

Type

Description

error

Object

Error message

Table 14 ErrorDetail

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

Table 15 Response body parameters

Parameter

Type

Description

error

Object

Error message

Table 16 ErrorDetail

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

Table 17 Response body parameters

Parameter

Type

Description

error

Object

Error message

Table 18 ErrorDetail

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

Verify the signatures of messages and digests using the key whose ID is 0d0466b0-e727-4d9c-b35d-f84bb474a37f and the RSASSA_PKCS1_V1_5_SHA_256 algorithm.

{
  "key_id" : "0d0466b0-e727-4d9c-b35d-f84bb474a37f",
  "signing_algorithm" : "RSASSA_PKCS1_V1_5_SHA_256",
  "signature" : "jFUqQESGBc0j6k9BozzrP9YL4qk8/W9DZRvK6XXX...",
  "message" : "MmFiZWE0ZjI3ZGIxYTkzY2RmYmEzM2YwMTA1YmJjYw=="
}

Example Responses

Status code: 200

Request succeeded.

{
  "key_id" : "0d0466b0-e727-4d9c-b35d-f84bb474a37f",
  "signature_valid" : "true"
}

SDK Sample Code

The SDK sample code is as follows.

Verify the signatures of messages and digests using the key whose ID is 0d0466b0-e727-4d9c-b35d-f84bb474a37f and the RSASSA_PKCS1_V1_5_SHA_256 algorithm.

 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
45
46
47
48
49
50
51
52
53
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 ValidateSignatureSolution {

    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();
        ValidateSignatureRequest request = new ValidateSignatureRequest();
        VerifyRequestBody body = new VerifyRequestBody();
        body.withSigningAlgorithm(VerifyRequestBody.SigningAlgorithmEnum.fromValue("RSASSA_PKCS1_V1_5_SHA_256"));
        body.withSignature("jFUqQESGBc0j6k9BozzrP9YL4qk8/W9DZRvK6XXX...");
        body.withMessage("MmFiZWE0ZjI3ZGIxYTkzY2RmYmEzM2YwMTA1YmJjYw==");
        body.withKeyId("0d0466b0-e727-4d9c-b35d-f84bb474a37f");
        request.withBody(body);
        try {
            ValidateSignatureResponse response = client.validateSignature(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());
        }
    }
}

Verify the signatures of messages and digests using the key whose ID is 0d0466b0-e727-4d9c-b35d-f84bb474a37f and the RSASSA_PKCS1_V1_5_SHA_256 algorithm.

 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
# 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 = ValidateSignatureRequest()
        request.body = VerifyRequestBody(
            signing_algorithm="RSASSA_PKCS1_V1_5_SHA_256",
            signature="jFUqQESGBc0j6k9BozzrP9YL4qk8/W9DZRvK6XXX...",
            message="MmFiZWE0ZjI3ZGIxYTkzY2RmYmEzM2YwMTA1YmJjYw==",
            key_id="0d0466b0-e727-4d9c-b35d-f84bb474a37f"
        )
        response = client.validate_signature(request)
        print(response)
    except exceptions.ClientRequestException as e:
        print(e.status_code)
        print(e.request_id)
        print(e.error_code)
        print(e.error_msg)

Verify the signatures of messages and digests using the key whose ID is 0d0466b0-e727-4d9c-b35d-f84bb474a37f and the RSASSA_PKCS1_V1_5_SHA_256 algorithm.

 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
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.ValidateSignatureRequest{}
	request.Body = &model.VerifyRequestBody{
		SigningAlgorithm: model.GetVerifyRequestBodySigningAlgorithmEnum().RSASSA_PKCS1_V1_5_SHA_256,
		Signature: "jFUqQESGBc0j6k9BozzrP9YL4qk8/W9DZRvK6XXX...",
		Message: "MmFiZWE0ZjI3ZGIxYTkzY2RmYmEzM2YwMTA1YmJjYw==",
		KeyId: "0d0466b0-e727-4d9c-b35d-f84bb474a37f",
	}
	response, err := client.ValidateSignature(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.