AdditionalData Property

Additional data to send when performing symmetric encryption or decryption.

Syntax

 googlekms.getAdditionalData([callback])
 googlekms.setAdditionalData( additionalData_Buffer, [callback])

Default Value

""

Callback

The 'callback' parameter specifies a function which will be called when the operation completes (or an error is encountered). If the 'callback' parameter is not specified, then the method will block and will not return until the operation completes (or an error is encountered).

The callback for the getAdditionalData([callback]) method is defined as:

function(err, buffer){ }

'err' is the error that occurred. If there was no error, then 'err' is 'null'.

'buffer' is the value returned by the method.

The callback for the setAdditionalData([callback]) method is defined as:

function(err){ }

'err' is the error that occurred. If there was no error, then 'err' is 'null'.

'err' has 2 properties which hold detailed information:

err.code
err.message

Remarks

This property can be set before calling Encrypt or Decrypt with a symmetric key to have the server include the specified data, known as additional authenticated data, when performing the cryptographic operation. If such data is provided during encryption, it must also be provided in order to successfully decrypt the data. Refer to the Google Cloud KMS documentation for more information.

Up to 65536 bytes of data may be provided. Note that this property is ignored when asymmetric encryption or decryption is performed.

This property is not available at design time.

Data Type

Buffer