Decrypting Data

Function

This API is used to decrypt data.

Constraints

When decrypting the data encrypted using asymmetric keys, you need to specify the key ID and encryption algorithm. If the specified key ID and encryption algorithm do not match those used for encrypting data, the decryption fails.

Calling Method

For details, see Calling APIs.

URI

POST /v1.0/{project_id}/kms/decrypt-data

**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 an 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
cipher_text	Yes	String	Ciphertext of encrypted data, which is the value of cipher_text in the data encryption output. The value matches the regular expression ^[0-9a-zA-Z+/=]{128,5648}$.
encryption_algorithm	No	String	Data encryption algorithm. Specify this parameter if only asymmetric keys are used. The default value is SYMMETRIC_DEFAULT. Possible values are as follows: SYMMETRIC_DEFAULT RSAES_OAEP_SHA_256 SM2_ENCRYPT
key_id	No	String	A 36-byte key ID which matches the regular expression ^[0-9a-z]{8}-[0-9a-z]{4}-[0-9a-z]{4}-[0-9a-z]{4}-[0-9a-z]{12}$, for example, 0d0466b0-e727-4d9c-b35d-f84bb474a37f.
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

**Table 4** Response body parameters
Parameter	Type	Description
key_id	String	Key ID.
plain_text	String	Plaintext.
plain_text_base64	String	Base64 value of the plaintext. In asymmetric encryption scenarios, if the encrypted plaintext contains invisible characters, the value is used as the decryption result.

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

Decrypt the ciphertext AgDoAG7EsEc2OHpQxz4gDFDH54Cqwaelxxxxxxx and add 123aad as the associated data. The data encryption algorithm is SYMMETRIC_DEFAULT.

{
  "cipher_text" : "AgDoAG7EsEc2OHpQxz4gDFDH54Cqwaelxxxxxxx",
  "encryption_algorithm" : "SYMMETRIC_DEFAULT",
  "additional_authenticated_data" : "123aad"
}

Example Responses

Status code: 200

Request succeeded.

{
  "key_id" : "bb6a3d22-dc93-47ac-b5bd-88df7ad35f1e",
  "plain_text" : "hello world",
  "plain_text_base64" : "aGVsbG8gd29ybGQ="
}

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.