method FlattenedEncrypt.prototype.setAdditionalAuthenticatedDataimport { FlattenedEncrypt } from "https://dotland.deno.dev/x/jose@v5.9.2/index.ts"; setAdditionalAuthenticatedData(aad: Uint8Array): thisSets the Additional Authenticated Data on the FlattenedEncrypt object. Parametersaad: Uint8ArrayAdditional Authenticated Data. Returnsthis