/**
 * Node.js Crypto adapter for Node.js environments
 * Uses @noble/ed25519 for Ed25519 operations
 * Requires Node.js 19+ or Node.js 18 with --experimental-global-webcrypto flag
 */
import { CryptoAdapter, KeyPair } from './adapter.js';
/**
 * Node.js Crypto implementation using Node.js built-in APIs and @noble/ed25519
 * Uses Buffer for base64 encoding and crypto.randomBytes for random generation
 *
 * Requirements:
 * - Node.js 19+ (crypto.subtle available globally)
 * - OR Node.js 18 with --experimental-global-webcrypto flag
 *
 * @example
 * ```typescript
 * import { RondevuAPI } from '@xtr-dev/rondevu-client'
 * import { NodeCryptoAdapter } from '@xtr-dev/rondevu-client/node'
 *
 * const crypto = new NodeCryptoAdapter()
 * const keyPair = await crypto.generateKeyPair()
 *
 * const api = new RondevuAPI(
 *   'https://signal.example.com',
 *   keyPair,
 *   crypto
 * )
 * ```
 */
export declare class NodeCryptoAdapter implements CryptoAdapter {
    constructor();
    /**
     * Generate a new Ed25519 key pair locally
     */
    generateKeyPair(): Promise<KeyPair>;
    /**
     * Sign a message using Ed25519
     */
    signMessage(privateKey: string, message: string): Promise<string>;
    /**
     * Verify an Ed25519 signature
     */
    verifySignature(publicKey: string, message: string, signature: string): Promise<boolean>;
    /**
     * Convert hex string to bytes
     * @throws Error if hex string is invalid
     */
    hexToBytes(hex: string): Uint8Array;
    /**
     * Convert bytes to hex string
     */
    bytesToHex(bytes: Uint8Array): string;
    bytesToBase64(bytes: Uint8Array): string;
    base64ToBytes(base64: string): Uint8Array;
    randomBytes(length: number): Uint8Array;
}