/**
 * @name naclOpen
 * @summary Opens a message using the receiver's secretKey and nonce
 * @description
 * Returns a message sealed by the sender, using the receiver's `secret` and `nonce`.
 * @example
 * <BR>
 *
 * ```javascript
 * import { naclOpen } from '@polkadot/util-crypto';
 *
 * naclOpen([...], [...], [...]); // => [...]
 * ```
 */
export declare function naclOpen(sealed: Uint8Array, nonce: Uint8Array, senderBoxPublic: Uint8Array, receiverBoxSecret: Uint8Array): Uint8Array | null;