import type { KeyPair } from '../auth';
export declare const sha256: (data: string | Buffer) => Buffer;
export declare const ripemd160: (data: string | Buffer) => Buffer;
export declare const doubleSha256: (data: string | Buffer) => Buffer;
export declare const hmacSha256: (key: string | Buffer, data: string | Buffer) => Buffer;
/**
 * Generate a cryptographically secure key pair using ECC secp256k1
 * @returns A key pair with private key in WIF format and public key in Steem format
 */
export declare const generateKeyPair: () => KeyPair;
/**
 * Sign a message with a private key using ECC secp256k1
 * @param message - The message to sign (string or Buffer)
 * @param privateKey - Private key in WIF format
 * @returns Hexadecimal signature string
 */
export declare const sign: (message: string | Buffer, privateKey: string) => string;
/**
 * Verify a message signature with a public key
 * @param message - The message that was signed (string or Buffer)
 * @param signature - Hexadecimal signature string
 * @param publicKey - Public key in Steem format (e.g., "STM...")
 * @returns True if signature is valid, false otherwise
 */
export declare const verify: (message: string | Buffer, signature: string, publicKey: string) => boolean;