import { type TArg, type TRet } from "@li0ard/gost3413";
/**
 * Encrypts data using Cipher Feedback (CFB) mode with Kuznyechik cipher
 *
 * @param key Encryption key
 * @param data Data to be encrypted
 * @param iv Initialization vector
 */
export declare const encryptCFB: (key: TArg<Uint8Array>, data: TArg<Uint8Array>, iv: TArg<Uint8Array>) => TRet<Uint8Array>;
/**
 * Decrypts data using Cipher Feedback (CFB) mode with Kuznyechik cipher
 *
 * @param key Encryption key
 * @param data Data to be decrypted
 * @param iv Initialization vector
 */
export declare const decryptCFB: (key: TArg<Uint8Array>, data: TArg<Uint8Array>, iv: TArg<Uint8Array>) => TRet<Uint8Array>;