feat: add chall, challconfig

src/chall.rs

@@ -0,0 +1,60 @@
+use clap::{ArgMatches, SubCommand, App, Arg};
+use crate::cmd::{Command, CommandError};
+use yubico_manager::Yubico;
+use yubico_manager::config::{Config, Mode, Slot};
+use std::ops::Deref;
+
+pub struct CommandImpl;
+
+impl Command for CommandImpl {
+    fn name(&self) -> &str { "chall" }
+
+    fn subcommand<'a>(&self) -> App<'a, 'a> {
+        SubCommand::with_name(self.name()).about("OpenPGP Card List subcommand")
+            .arg(Arg::with_name("challenge").long("challenge").takes_value(true).help("Challenge"))
+            .arg(Arg::with_name("challenge-hex").long("challenge-hex").takes_value(true).help("Challenge HEX"))
+            .arg(Arg::with_name("json").long("json").help("JSON output"))
+    }
+
+    fn run(&self, _arg_matches: &ArgMatches, sub_arg_matches: &ArgMatches) -> CommandError {
+        let challenge_bytes: Vec<u8>;
+        if let Some(challenge) = sub_arg_matches.value_of("challenge") {
+            challenge_bytes = challenge.as_bytes().to_vec();
+        } else if let Some(challenge_hex) = sub_arg_matches.value_of("challenge-hex") {
+            challenge_bytes = hex::decode(challenge_hex)?;
+        } else {
+            return simple_error!("Challenge must assigned");
+        }
+
+        // Challenge can not be greater than 64 bytes
+        if challenge_bytes.len() > 64 {
+            return simple_error!("Challenge bytes is: {}, more than 64", challenge_bytes.len());
+        }
+
+        let mut yubi = Yubico::new();
+
+        if let Ok(device) = yubi.find_yubikey() {
+            success!("Found key, Vendor ID: {:?} Product ID {:?}", device.vendor_id, device.product_id);
+
+            let config = Config::default()
+                .set_vendor_id(device.vendor_id)
+                .set_product_id(device.product_id)
+                .set_variable_size(true)
+                .set_mode(Mode::Sha1)
+                .set_slot(Slot::Slot2);
+
+            // In HMAC Mode, the result will always be the SAME for the SAME provided challenge
+            let hmac_result = yubi.challenge_response_hmac(&challenge_bytes, config).unwrap();
+
+            // Just for debug, lets check the hex
+            let v: &[u8] = hmac_result.deref();
+            let hex_string = hex::encode(v);
+
+            success!("{}", hex_string);
+        } else {
+            warning!("Yubikey not found");
+        }
+
+        Ok(())
+    }
+}