/**
 * Web Crypto adapter for browser environments
 * Uses @noble/ed25519 for Ed25519 operations
 */
import { CryptoAdapter, KeyPair } from './adapter.js';
/**
 * Web Crypto implementation using browser APIs and @noble/ed25519
 * Uses btoa/atob for base64 encoding and crypto.getRandomValues for random bytes
 */
export declare class WebCryptoAdapter implements CryptoAdapter {
    /**
     * 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;
}