From 698f6cbbe1539369d8857739df11425435af1daf Mon Sep 17 00:00:00 2001
From: Robin Krahl <robin.krahl@ireas.org>
Date: Tue, 14 Jan 2020 17:31:26 +0100
Subject: Add basic usage examples

This patch adds two basic usage examples:  listing and connecting to
Nitrokey devices, and generating a one-time password.
---
 examples/otp.rs | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 examples/otp.rs

(limited to 'examples/otp.rs')

diff --git a/examples/otp.rs b/examples/otp.rs
new file mode 100644
index 0000000..819de28
--- /dev/null
+++ b/examples/otp.rs
@@ -0,0 +1,43 @@
+// Copyright (C) 2020 Robin Krahl <robin.krahl@ireas.org>
+// SPDX-License-Identifier: CC-0
+
+//! Connects to a Nitrokey device, configures an TOTP slot and generates a one-time password from
+//! it.
+
+use std::time;
+
+use nitrokey::{Authenticate, ConfigureOtp, Device, GenerateOtp};
+
+fn main() -> Result<(), nitrokey::Error> {
+    let mut manager = nitrokey::take()?;
+    let device = manager.connect()?;
+
+    // Configure the OTP slot (requires admin PIN)
+    let data = nitrokey::OtpSlotData::new(
+        1,
+        "test",
+        "3132333435363738393031323334353637383930",
+        nitrokey::OtpMode::SixDigits,
+    );
+    let mut admin = device.authenticate_admin("12345678")?;
+    admin.write_totp_slot(data, 30)?;
+    let mut device = admin.device();
+
+    // Set the time for the OTP generation
+    let time = time::SystemTime::now()
+        .duration_since(time::UNIX_EPOCH)
+        .expect("Invalid system time");
+    device.set_time(time.as_secs(), true)?;
+
+    // Generate a one-time password -- depending on the configuration, we have to set the user PIN
+    let config = device.get_config()?;
+    let otp = if config.user_password {
+        let user = device.authenticate_user("123456")?;
+        user.get_totp_code(1)
+    } else {
+        device.get_totp_code(1)
+    }?;
+    println!("Generated OTP code: {}", otp);
+
+    Ok(())
+}
-- 
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