Encrypts plaintext by using a symmetric key.
Usage notes
- Keys outside Key Management Service (KMS) instances: To perform cryptographic operations, use Alibaba Cloud SDK to call operations.
- Keys in KMS instances: To perform cryptographic operations, use one of the following methods:
- Method 1 (recommended): Use KMS Instance SDK to call KMS Instance API operations. For more information, see KMS Instance SDK and KMS Instance API.
- Method 2: Use Alibaba Cloud SDK to call operations. The authentication method supports only RAM roles whose trusted entities are Alibaba Cloud services. For more information, see Create a RAM role for a trusted Alibaba Cloud service.
QPS limits
You can call this operation up to 750 times per second per account. If the number of the calls per second exceeds the limit, throttling is triggered. As a result, your business may be affected. We recommend that you take note of the limit when you call this operation.
Description
- KMS uses the primary version of a specified key to encrypt data.
- Only data of 6 KB or less can be encrypted. For example, you can call this operation to encrypt Rivest-Shamir-Adleman (RSA) keys, database passwords, or other sensitive information.
- If you want to migrate encrypted data between regions, you can call the Encrypt operation to encrypt the data key plaintext that is transferred from the source region in the destination region. In this case, the data key ciphertext is generated in the destination region. You can also call the Decrypt operation to decrypt the data key ciphertext in the destination region.
Debugging
Request parameters
Parameter |
Type |
Required |
Example |
Description |
Action | String | Yes | Encrypt | The operation that you want to perform. Set the value to Encrypt. |
KeyId | String | Yes | key-hzz630494463ejqjx**** | The ID, alias, or Alibaba Cloud Resource Name (ARN) of the key. For more information, see Manage a key alias. Note When you access a key within another Alibaba Cloud account, you must enter the ARN of the key. The key ARN is in the acs:kms:${region}:${account}:key/${keyid} format. |
Plaintext | String | Yes | SGVsbG8gd29y**** | The plaintext. The plaintext must be Base64 encoded. |
EncryptionContext | Map | No | {"Example":"Example"} | The encryption context. The value is a JSON string that consists of key-value pairs. If you configure this parameter, an equivalent value is required when you call the Decrypt operation. For more information, see EncryptionContext. |
Response parameters
Parameter |
Type |
Example |
Description |
KeyVersionId | String | 86a9efd9-3d16-4894-bd4f-1fc43f3f**** | The version ID of the key that is used to encrypt the plaintext. The primary version of the key is used. |
KeyId | String | key-hzz630494463ejqjx**** | The ID of the key. If KeyId is set to the alias or ARN of the key, the ID of the key is returned. |
CiphertextBlob | String | DZhOWVmZDktM2QxNi00ODk0LWJkNGYtMWZjNDNmM2YyYWJmaaSl+TztSIMe43nbTH/Z1Wr4XfLftKhAciUmDQXuMRl4WTvKhxjMThjK**** | The ciphertext that is encrypted by using the primary key version. |
RequestId | String | 475f1620-b9d3-4d35-b5c6-3fbdd941423d | The request ID. |
Examples
Sample requests
http(s)://[Endpoint]/?Action=Encrypt
&KeyId=key-hzz630494463ejqjx****
&Plaintext=SGVsbG8gd29y****
&Common request parameters
Sample success responses
XML
format
HTTP/1.1 200 OK
Content-Type:application/xml
<EncryptResponse>
<KeyVersionId>86a9efd9-3d16-4894-bd4f-1fc43f3f****</KeyVersionId>
<KeyId>key-hzz630494463ejqjx****</KeyId>
<CiphertextBlob>DZhOWVmZDktM2QxNi00ODk0LWJkNGYtMWZjNDNmM2YyYWJmaaSl+TztSIMe43nbTH/Z1Wr4XfLftKhAciUmDQXuMRl4WTvKhxjMThjK****</CiphertextBlob>
<RequestId>475f1620-b9d3-4d35-b5c6-3fbdd941423d</RequestId>
</EncryptResponse>
JSON
format
HTTP/1.1 200 OK
Content-Type:application/json
{
"KeyVersionId" : "86a9efd9-3d16-4894-bd4f-1fc43f3f****",
"KeyId" : "key-hzz630494463ejqjx****",
"CiphertextBlob" : "DZhOWVmZDktM2QxNi00ODk0LWJkNGYtMWZjNDNmM2YyYWJmaaSl+TztSIMe43nbTH/Z1Wr4XfLftKhAciUmDQXuMRl4WTvKhxjMThjK****",
"RequestId" : "475f1620-b9d3-4d35-b5c6-3fbdd941423d"
}
Error codes
HTTP status code |
Error code |
Error message |
Description |
400 | InvalidParameter | The specified parameter is invalid. | The specified parameter is invalid. |
404 | Forbidden.KeyNotFound | The specified Key is not found. | The key does not exist. |
404 | Forbidden.AliasNotFound | The specified Alias is not found. | The specified alias is not found. |
For a list of error codes, see Service error codes.