import type { ICryptoHelper } from 'gdc-common-utils-ts/interfaces/ICryptoHelper';
/**
 * Node.js implementation of the low-level crypto helper contract used by
 * `CryptographyService` and managed wallet adapters.
 */
export declare class NodeCryptoHelper implements ICryptoHelper {
    /**
     * Returns cryptographically secure random bytes from the Node runtime.
     */
    getRandomBytes(byteCount: number): Promise<Uint8Array>;
    /**
     * Computes a digest for the provided string using one Node-supported hash algorithm.
     */
    digestString(data: string, algorithm: string): Promise<string>;
    /**
     * Returns a cryptographically secure UUID v4 from the Node runtime.
     */
    randomUUID(): string;
}