# @smithy/signature-v4 [![NPM version](https://img.shields.io/npm/v/@smithy/signature-v4/latest.svg)](https://www.npmjs.com/package/@smithy/signature-v4) [![NPM downloads](https://img.shields.io/npm/dm/@smithy/signature-v4.svg)](https://www.npmjs.com/package/@smithy/signature-v4) This package contains an implementation of the [AWS Signature Version 4](https://docs.aws.amazon.com/AmazonS3/latest/API/sig-v4-authenticating-requests.html) authentication scheme. It is internal to Smithy-TypeScript generated clients, and not generally intended for standalone usage outside this context. For custom usage, inspect the interface of the SignatureV4 class.