XChaCha20-Poly1305 as defined by XChaCha20 IRTF CFRG draft 03, and IETF RFC 8439
export const KEY_BYTES: number = 32;
export const NONCE_BYTES: number = 24;
export const PLAINTEXT_BYTES_MAX: bigint = 274877906880n;
export const CIPHERTEXT_BYTES_MAX: bigint = 274877906896n;
export const AAD_BYTES_MAX: bigint = 18446744073709551615n;
export const TAG_BYTES: number = 16;
export function seal(
key: Uint8Array,
nonce: Uint8Array,
plaintext: Uint8Array,
aad: Uint8Array
): null | { ciphertext: Uint8Array; tag: Uint8Array; aad: Uint8Array };
export function open(
key: Uint8Array,
nonce: Uint8Array,
ciphertext: Uint8Array,
aad: Uint8Array,
receivedTag: Uint8Array
): null | Uint8Array;