function chacha20poly1305Sealimport { chacha20poly1305Seal } from "https://deno.land/x/xchacha20_poly1305@v0.2.0/deps.ts"; chacha20poly1305Seal(key: Uint8Array,nonce: Uint8Array,plaintext: Uint8Array,aad: Uint8Array,): null | { ciphertext: Uint8Array; tag: Uint8Array; aad: Uint8Array; }Parameterskey: Uint8Arraynonce: Uint8Arrayplaintext: Uint8Arrayaad: Uint8ArrayReturnsnull | { ciphertext: Uint8Array; tag: Uint8Array; aad: Uint8Array; }