import { SecretShares } from "./types";
/**
 * Encryption utilities using AES-256-GCM and Shamir Secret Sharing
 */
/**
 * Generate a random encryption key
 */
export declare function generateEncryptionKey(): string;
/**
 * Encrypt data using AES-256-GCM
 * @param data Plaintext data to encrypt
 * @param key Encryption key (hex string)
 * @returns Encrypted data as hex string
 */
export declare function encryptAES(data: string, key: string): Promise<string>;
/**
 * Decrypt data using AES-256-GCM
 * @param encryptedData Encrypted data as hex string
 * @param key Decryption key (hex string)
 * @returns Decrypted plaintext
 */
export declare function decryptAES(encryptedData: string, key: string): Promise<string>;
/**
 * Split a secret key into shares using Shamir Secret Sharing
 * @param secret Secret to split (hex string)
 * @param threshold Number of shares needed to reconstruct (default: 2)
 * @param totalShares Total number of shares to create (default: 3)
 * @returns Object containing the shares
 */
export declare function splitSecret(secret: string, threshold?: number, totalShares?: number): SecretShares;
/**
 * Combine shares to reconstruct the secret
 * @param shares Array of share strings
 * @returns Reconstructed secret (hex string)
 */
export declare function combineShares(shares: string[]): string;
/**
 * Encrypt a share for a specific recipient using their public key
 * Note: This is a placeholder - in production, use proper ECIES encryption
 * @param share Share to encrypt
 * @param publicKey Recipient's public key (hex string)
 * @returns Encrypted share (hex string)
 */
export declare function encryptShareForRecipient(share: string, publicKey: string): Promise<string>;
/**
 * Decrypt a share encrypted for the recipient
 * @param encryptedShare Encrypted share
 * @param privateKey Recipient's private key (hex string)
 * @returns Decrypted share
 */
export declare function decryptShareFromRecipient(encryptedShare: string, privateKey: string): Promise<string>;