Rust Programming Cookbook

How to do it ...

Let's repeat a few steps from the SHA256 library from the previous recipe:

1. First, let's take care of the Rust part. Open rust-digest/Cargo.toml to add ring, a dependency for the hashing part, as well as the crate-type configuration for cross-compilation:

[lib]name = "digest"crate-type = ["cdylib"][dependencies]libc = "0.2"ring = "0.14"

2. Next, let's look at the Rust code. Just as in other recipes in this chapter, we are creating a fast way to generate an SHA digest via Rust to be used from Node.js:

use std::ffi::{CStr, CString};use std::os::raw::c_char;use ring::digest;#[no_mangle]pub extern "C" fn digest(data: *mut c_char) -> *mut c_char {    unsafe {        let data = CStr::from_ptr(data); let signature = digest::digest(&digest::SHA256, ...