import Noise from "noise-protocol";
import type { X25519Keypair } from "./crypto.js";
export declare const HASH_OFFSET_SHA256 = 32;
export declare const HASH_LEN_SHA256 = 32;
/**
 * Test-only: makes the NEXT internal ephemeral `generateKeypair` call use
 * the provided fixed keys instead of random ones. Consumes after one use.
 * Required to reproduce official Noise test vectors.
 */
export declare function setNextEphemeralForTest(pk: Uint8Array, sk: Uint8Array): void;
export declare const NoiseXX_SHA256: typeof Noise;
/**
 * Builds a noise-protocol keypair from a raw 32-byte X25519 private scalar.
 * Computes the public key via X25519 base-point multiplication.
 */
export declare function keypairFromRawSk(rawSk: Uint8Array): X25519Keypair;