Low-level SigV4 request signing implementations. Customers will not generally need to use this crate directly. If you
need to manually sign requests, [aws-sig-auth](https://crates.io/crates/aws-sig-auth) offers a higher level interface
for signing.
This crate is part of the [AWS SDK for Rust](https://awslabs.github.io/aws-sdk-rust/) and the [smithy-rs](https://github.com/awslabs/smithy-rs) code generator. In most cases, it should not be used directly.