function openimport { open } from "https://deno.land/x/chacha20_poly1305@v0.2.0/mod.ts"; open(key: Uint8Array,nonce: Uint8Array,ciphertext: Uint8Array,aad: Uint8Array,receivedTag: Uint8Array,): null | Uint8ArrayParameterskey: Uint8Arraynonce: Uint8Arrayciphertext: Uint8Arrayaad: Uint8ArrayreceivedTag: Uint8ArrayReturnsnull | Uint8Array