/**
 * This file contains functions for importing and exporting node's native
 * `ed25519` crypto keys in `der` format used to sign and verify ledger
 * records when executing in node environment.
 * In ledger transport we use raw keys without prefixes encoded in
 * base64, 44 characters in length.
 * Native `der` keys created with `crypto` library are prefixed with an ASN.1
 * hex prefixes when exported or imported:
 * - public key: `302a300506032b6570032100`
 * - private key: `302e020100300506032b657004220420`
 * So we need to strip this prefix when we export `der` key to raw key,
 * or prepend when we import `der` key from raw key.
 * see: https://datatracker.ietf.org/doc/html/rfc8410 (sections 9 and 10)
 */
import { KeyObject } from 'crypto';
/**
 * Exports public `der` key to raw key format
 * @param key public key in `der`format
 * @returns public key in raw format
 */
export declare function exportPublicKey(key: KeyObject): string;
/**
 * Exports private `der` key to raw key format
 * @param key private key in `der` format
 * @returns private key in raw format
 */
export declare function exportPrivateKey(key: KeyObject): string;
/**
 * Imports public `der` key from raw key format
 * @param key public key in raw format
 * @returns public key in `der` format
 */
export declare function importPublicKey(key: string, format?: string): KeyObject;
/**
 * Imports private `der` key from raw key format
 * @param key private key in raw format
 * @returns private key in `der` format
 */
export declare function importPrivateKey(key: string): KeyObject;