Function extract_sha256 

pub fn extract_sha256(salt: &[u8], ikm: &[u8]) -> [u8; 32]

Extract a fixed-length pseudorandom key from input keying material

This is the first phase of HKDF. It takes some source of initial keying material and derives from it a fixed-length pseudorandom key.

Arguments

• salt - Optional salt value (can be empty)
• ikm - Input keying material

Returns

A 32-byte pseudorandom key

Example

use crypto_async_rs::hkdf;

let salt = b"random-salt";
let ikm = b"input-key-material";
let prk = hkdf::extract_sha256(salt, ikm);