import { Buffer } from 'buffer';

declare function sha256(input: Uint8Array): Promise<Uint8Array>;
interface Keypair {
    publicKey: string;
    secretKey: string;
}
/**
 * Generate a new Ed25519 keypair
 * @returns A keypair with base58-encoded public and secret keys
 */
declare function generateKeyPair(): Keypair;
/**
 * Create a keypair from a base58-encoded private key
 * @param b58PrivateKey - Base58-encoded private key
 * @returns A keypair with base58-encoded public and secret keys
 */
declare function createKeyPairFromSecret(b58PrivateKey: string): Keypair;
/**
 * Sign data using Ed25519 with a secret key
 * @param secretKey - Base58-encoded secret key or raw Uint8Array
 * @param data - Data to sign (string, Uint8Array, or Buffer)
 * @returns Base64-encoded signature
 */
declare function signWithSecret(secretKey: string | Uint8Array, data: string | Uint8Array | Buffer): Uint8Array;

export { Keypair, createKeyPairFromSecret, generateKeyPair, sha256, signWithSecret };