import { Checksum, SourceData } from "@aws-sdk/types";
export declare class Hash implements Checksum {
  private readonly algorithmIdentifier;
  private readonly secret?;
  private hash;
  constructor(algorithmIdentifier: string, secret?: SourceData);
  update(toHash: SourceData, encoding?: "utf8" | "ascii" | "latin1"): void;
  digest(): Promise<Uint8Array>;
  reset(): void;
}