import type { Generator } from '../types.js';
/**
 * Serpent-256 ECB counter-mode PRF for Fortuna's generator slot.
 *
 * Each 16-byte counter value is encrypted as a plaintext block to produce
 * one block of pseudorandom output. Practical Cryptography (Ferguson &
 * Schneier, 2003) §9.4.
 *
 * Pass to `Fortuna.create({ generator: SerpentGenerator, ... })`, do not
 * call `generate()` directly outside of Fortuna.
 */
export declare const SerpentGenerator: Generator;