declare function loadRelayKey(): Buffer;
interface EncryptedPayload {
    v: 1;
    nonce: string;
    ciphertext: string;
    tag: string;
    hmac: string;
}
declare function encrypt(plaintext: Buffer, masterKey: Buffer): EncryptedPayload;
declare function decrypt(payload: EncryptedPayload, masterKey: Buffer): Buffer;
declare function encryptJSON(data: unknown, masterKey: Buffer): EncryptedPayload;
declare function decryptJSON<T = unknown>(payload: EncryptedPayload, masterKey: Buffer): T;
declare function encryptFile(filePath: string, masterKey: Buffer): EncryptedPayload;
declare const RELAY_KEY_PATH: string;
declare function generateRelayKey(): Buffer;
declare function encodePairingString(key: Buffer): string;
declare function decodePairingString(str: string): Buffer;
declare function hashBuffer(data: Buffer): string;

export { type EncryptedPayload, RELAY_KEY_PATH, decodePairingString, decrypt, decryptJSON, encodePairingString, encrypt, encryptFile, encryptJSON, generateRelayKey, hashBuffer, loadRelayKey };