tencent cloud


Last updated: 2023-03-24 16:02:41

1. API Description

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

This API is used to decrypt the ciphertext and obtain the plaintext data.

A maximum of 300 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.

Parameter Name Required Type Description
Action Yes String Common Params. The value used for this API: Decrypt.
Version Yes String Common Params. The value used for this API: 2019-01-18.
Region No String Common Params. This parameter is not required for this API.
CiphertextBlob Yes String The ciphertext data to be decrypted.
EncryptionContext No String JSON string of key-value pair. If this parameter is specified for Encrypt, the same parameter needs to be provided when the Decrypt API is called. The maximum length is 1,024 bytes.
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 ciphertext is returned), SM2_C1C3C2_ASN1 (C1C3C2 ASN1 ciphertext is returned), RSAES_PKCS1_V1_5, RSAES_OAEP_SHA_1, and RSAES_OAEP_SHA_256. This field is used in combination with EncryptionPublicKey for encryption. If it is left empty, an 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.
RequestId String The unique request ID, which is returned for each request. RequestId is required for locating a problem.

4. Example

Example1 Decrypting

Decrypt ciphertext.

Input Example

&<Common request parameters>

Output Example

    "Response": {
        "KeyId": "23e80852-1e38-11e9-b129-5cb9019b4b01",
        "Plaintext": "dGVzdCUyMHBsYWluJTIwdGV4dA==",
        "RequestId": "1b580852-1e38-11e9-b129-5cb9019b4b00"

5. Developer Resources


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.InvalidCiphertext Incorrect ciphertext format
ResourceUnavailable.CmkDisabled The CMK has been disabled.
ResourceUnavailable.CmkNotFound The CMK does not exist.
UnauthorizedOperation Unauthorized operation.
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