feat: u2f

src/digest.rs

@@ -0,0 +1,7 @@
+use sha2::{Digest, Sha256};
+
+pub fn sha256(input: &str) -> Vec<u8> {
+    let mut challenge = Sha256::default();
+    Digest::update(&mut challenge, input.as_bytes());
+    challenge.finalize().to_vec()
+}