/**
 * deriveSymmetricKey derives a MRAE AEAD symmetric key suitable for use with the asymmetric
 * box primitives from the provided X25519 public and private keys.
 */
export declare function deriveSymmetricKey(publicKey: Uint8Array, privateKey: Uint8Array): Uint8Array;
/**
 * boxSeal boxes ("seals") the provided additional data and plaintext via
 * Deoxys-II-256-128 using a symmetric key derived from the provided
 * X25519 public and private keys.
 */
export declare function boxSeal(nonce: Uint8Array, plainText: Uint8Array, associateData: Uint8Array, publicKey: Uint8Array, privateKey: Uint8Array): Uint8Array;
/**
 * boxOpen unboxes ("opens") the provided additional data and plaintext via
 * Deoxys-II-256-128 using a symmetric key derived from the provided
 * X25519 public and private keys.
 */
export declare function boxOpen(nonce: Uint8Array, ciperText: Uint8Array, associateData: Uint8Array, publicKey: Uint8Array, privateKey: Uint8Array): Uint8Array;