import BigInteger from 'bigi';
import { Curve, Point } from 'ecurve';
import { ECSignatureType } from '../../types';
export declare const ecdsaSign: ({ curve, hash, d, nonce, }: {
    curve: Curve;
    hash: Buffer;
    d: BigInteger;
    nonce: number;
}) => ECSignatureType;
/**
 * Calculate pubkey extraction parameter.
 *
 * When extracting a pubkey from a signature, we have to
 * distinguish four different cases. Rather than putting this
 * burden on the verifier, Bitcoin includes a 2-bit value with the
 * signature.
 *
 * This function simply tries all four cases and returns the value
 * that resulted in a successful pubkey recovery.
 */
export declare const calcPubKeyRecoveryParam: ({ curve, e, signature, Q, }: {
    curve: Curve;
    e: BigInteger;
    signature: ECSignatureType;
    Q: Point;
}) => number;