ed448Params.context

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

context 成员表示要与消息关联的可选上下文数据。Node.js 的 Web Crypto API 实现仅支持零长度上下文，这等同于根本不提供上下文。

【The context member represents the optional context data to associate with the message. The Node.js Web Crypto API implementation only supports zero-length context which is equivalent to not providing context at all.】