/**
 * Implementation of GOST R 34.12-2015 ([RFC 7801](https://datatracker.ietf.org/doc/html/rfc7801.html)) "Kuznyechik" block cipher
 * @module
 */
import { type TArg, type TRet } from "@noble/curves/utils.js";
import type { Cipher } from "../types.js";
/** Kuznyechik (GOST R 34.12-2015) cipher */
export declare class Kuznyechik implements Cipher {
    readonly keySize = 32;
    readonly blockSize = 16;
    private roundKeys;
    /**
     * Kuznyechik (GOST R 34.12-2015) cipher
     * @param key Encryption key
     */
    constructor(key: TArg<Uint8Array>);
    encrypt(plaintext: TArg<Uint8Array>): TRet<Uint8Array>;
    decrypt(ciphertext: TArg<Uint8Array>): TRet<Uint8Array>;
}