import { ec as EC } from 'elliptic';
declare const secp256k1: EC;
import BN from 'bn.js';
import { PublicKey } from './key_public';
type ECPoint = ReturnType<typeof secp256k1.g.mul>;
/**
 * Constant-time buffer comparison to prevent timing attacks.
 * Returns true only if a.length === b.length and a[i] === b[i] for all i.
 */
export declare function constantTimeCompare(a: Buffer | Uint8Array, b: Buffer | Uint8Array): boolean;
export declare class PrivateKey {
    d: BN;
    public_key?: PublicKey;
    /**
     * @private see static functions
     * @param {BN} d
     */
    constructor(d: BN);
    static fromBuffer(buf: Buffer): PrivateKey;
    /** @arg {string} seed - any length string. This is private, the same seed produces the same private key every time. */
    static fromSeed(seed: string): PrivateKey;
    static isWif(text: string): boolean;
    /**
     * @throws {AssertError|Error} parsing key
     * @return {string} Wallet Import Format (still a secret, Not encrypted)
     */
    static fromWif(private_wif: string): PrivateKey;
    toWif(): string;
    /** Alias for {@link toWif} */
    toString(): string;
    /**
     * @return {Point}
     */
    toPublicKeyPoint(): ECPoint;
    toPublic(): PublicKey;
    toBuffer(): Buffer;
    /** ECIES */
    get_shared_secret(public_key: PublicKey | string): Buffer;
    /** @throws {Error} - overflow of the key could not be derived */
    child(offset: Buffer): PrivateKey;
    static fromHex(hex: string): PrivateKey;
    toHex(): string;
    toPublicKey(): PublicKey;
}
export {};