Checksum calculation and verification callbacks for HTTP request and response bodies sent by service clients generated by [smithy-rs](https://github.com/smithy-lang/smithy-rs).
This crate is part of the [AWS SDK for Rust](https://awslabs.github.io/aws-sdk-rust/) and the [smithy-rs](https://github.com/smithy-lang/smithy-rs) code generator. In most cases, it should not be used directly.