Function

This API uses the private key of an asymmetric key to verify a signature.

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. According to the GBT32918 standard, in SM2 signature value calculation, the message digest is not an SM3 digest calculated based on the original message. Instead, it is a digest of the concatenation of Z(A) and M. Here M indicates the original message to be signed, and Z(A) indicates the hash value of user A defined in GBT32918.

URI

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

**Table 1** URI parameters
Parameter	Mandatory	Type	Description
project_id	Yes	String	Project ID

Request Parameters

**Table 2** Request header parameter
Parameter	Mandatory	Type	Description
X-Auth-Token	Yes	String	User token. The token can be obtained by calling the IAM API. (The token is the value of X-Subject-Token in the response header.)

**Table 3** Request body parameters
Parameter	Mandatory	Type	Description
key_id	Yes	String	36-byte ID of a CMK that matches the regular expression ^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$ Example: 0d0466b0-e727-4d9c-b35d-f84bb474a37f
message	Yes	String	Message digest or message to be signed. The message must be encoded using Base64 and be less than 4096 bytes.
signature	Yes	String	Signature value to be verified, which is encoded using Base64.
signing_algorithm	Yes	String	Signature algorithm. Its value can be: 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. Its value can be: DIGEST (message digest) RAW (original message)
sequence	No	String	36-byte serial number of a request message Example: 919c82d4-8046-4722-9094-35c3c6524cff

Response Parameters

Status code: 200

**Table 4** Response body parameters
Parameter	Type	Description
key_id	String	CMK ID
signature_valid	String	Whether the signature is valid. Its value can be true (valid) or false (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
error_msg	String	Error information

Status code: 401

**Table 7** Response body parameter
Parameter	Type	Description
error	Object	Error message.

**Table 8** ErrorDetail
Parameter	Type	Description
error_code	String	Error code
error_msg	String	Error information

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
error_msg	String	Error information

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
error_msg	String	Error information

Status code: 500

**Table 13** Response body parameter
Parameter	Type	Description
error	Object	Error message.

**Table 14** ErrorDetail
Parameter	Type	Description
error_code	String	Error code
error_msg	String	Error information

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
error_msg	String	Error information

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
error_msg	String	Error information

Example Request

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

Example Response

Status code: 200

The request has succeeded.

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

Status Code

Status Code	Description
200	The request has succeeded.
400	Invalid request parameters.
401	Username and password are required to access the page requested.
403	Authentication failed.
404	The requested resource does not exist or is not found.
500	Internal service error.
502	Failed to complete the request. The server receives an invalid response from the upstream server.
504	Gateway timed out.

Authenticating a Signature

Function

Constraints

URI

Request Parameters

Response Parameters

Example Request

Example Response

Status Code