export interface HashFunction {
  readonly blockSize: number;
  readonly update: (_: Uint8Array) => HashFunction;
  readonly digest: () => Uint8Array;
}
export declare class Sha1 implements HashFunction {
  readonly blockSize: number;
  private readonly impl;
  constructor(firstData?: Uint8Array);
  update(data: Uint8Array): Sha1;
  digest(): Uint8Array;
}
export declare class Sha256 implements HashFunction {
  readonly blockSize: number;
  private readonly impl;
  constructor(firstData?: Uint8Array);
  update(data: Uint8Array): Sha256;
  digest(): Uint8Array;
}
export declare class Sha512 implements HashFunction {
  readonly blockSize: number;
  private readonly impl;
  constructor(firstData?: Uint8Array);
  update(data: Uint8Array): Sha512;
  digest(): Uint8Array;
}