/// <reference types="node" />
import DidPublicKeyModel from '../models/DidPublicKeyModel';
import KeyUsage from '../KeyUsage';
import { PrivateKey } from 'did-auth-jose-kenhuang';
/**
 * Class containing reusable cryptographic operations.
 */
export default class Cryptography {
    /**
     * SHA256 hash function.
     */
    static sha256hash(value: Buffer): Buffer;
    /**
     * Generates a random pair of SECP256K1 public-private key-pair in JWK format.
     * NOTE: The public key returned is wrapped as a DidPublicKeyModel for convenient usage.
     * @returns Public key, followed by private key.
     */
    static generateKeyPairJwk(keyId: string, usage: KeyUsage): Promise<[DidPublicKeyModel, PrivateKey]>;
    /**
     * Generates a random pair of SECP256K1 public-private key-pair in HEX format.
     * @returns Public key, followed by private key.
     */
    static generateKeyPairHex(keyId: string, usage: KeyUsage): Promise<[DidPublicKeyModel, string]>;
    /**
     * Signs the given content using the given private key.
     * @param content Content to be signed.
     * @param privateKey A SECP256K1 private-key either in HEX string format or JWK format.
     */
    static sign(content: string, privateKey: string | PrivateKey): Promise<string>;
    /**
     * Verifies that the given signature matches the given content being signed.
     * @param content Content signed.
     * @param encodedSignature Encoded signature.
     * @param publicKey The public key to be used for verification.
     * @returns true if signature is successfully verified, false otherwise.
     */
    static verifySignature(content: string, encodedSignature: string, publicKey: DidPublicKeyModel): Promise<boolean>;
}