export declare class SHA1 {
    private _h0;
    private _h1;
    private _h2;
    private _h3;
    private _h4;
    private _length;
    private _offset;
    private _shift;
    private _block;
    digest(): string;
    update(chunk: ArrayLike<number>): void;
    private _write(byte);
    private _processBlock();
}
