import { RandomBase } from './randomBase.js';
export declare class ChaCha20 extends RandomBase {
    private keynonce;
    private state;
    private buffer;
    private filledBuffer;
    private counter;
    constructor(seed?: Uint8Array | undefined);
    private fillBuffer;
    private fillBufferDirect;
    protected generateBigUintByBytes(bytes: number): bigint;
    generateBigUintByBits(bits: number): bigint;
    generateBytes(array: Uint8Array): Uint8Array;
}
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