Initial commit with sha256 implementation.

.gitignore

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+/target
+Cargo.lock

Cargo.toml

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+[package]
+name = "hexihasher"
+version = "0.1.0"
+authors = ["Bill Thiede <git@xinu.tv>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+sha2 = "0.8.1"
+faster-hex = "0.4.1"

src/lib.rs

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+//! This module contains various helpers for generating the hashes in hex representation.
+use faster_hex;
+use sha2;
+use sha2::Digest;
+
+/// Return hex string representation of the sha256 hash of v.
+/// ```
+/// use hexihasher;
+/// let s = hexihasher::sha256(&[0, 1, 2, 3][..]);
+///
+/// assert_eq!(s, "054edec1d0211f624fed0cbca9d4f9400b0e491c43742af2c5b0abebf0c990d8");
+/// ```
+pub fn sha256(v: &[u8]) -> String {
+    // create a Sha256 object
+    let mut hasher = sha2::Sha256::new();
+
+    // write input message
+    hasher.input(v);
+
+    // read hash digest and consume hasher
+    let result = hasher.result();
+    faster_hex::hex_string(&result).expect("failed to hash")
+}