aesGcmParams.additionalData

• 类型：<ArrayBuffer> | <TypedArray> | <DataView> | <Buffer> | <undefined>

使用 AES-GCM 方法时，additionalData 是额外输入，它不会被加密，但会包含在数据的认证中。additionalData 的使用是可选的。

【With the AES-GCM method, the additionalData is extra input that is not encrypted but is included in the authentication of the data. The use of additionalData is optional.】