/**
 * Challenge-response authentication for node identity verification.
 * Interface in brightchain-lib; ECDSA implementation in brightchain-api-lib.
 *
 * All binary parameters use Uint8Array for browser compatibility.
 *
 * @see Requirements 9.1, 9.2, 9.4
 */
export interface INodeAuthenticator {
    /** Generate a random challenge nonce */
    createChallenge(): Uint8Array;
    /** Sign a challenge with the node's private key */
    signChallenge(challenge: Uint8Array, privateKey: Uint8Array): Promise<Uint8Array>;
    /** Verify a signature against a public key */
    verifySignature(challenge: Uint8Array, signature: Uint8Array, publicKey: Uint8Array): Promise<boolean>;
    /** Get the node ID derived from a public key */
    deriveNodeId(publicKey: Uint8Array): string;
}
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