feat: add nusb support

Cargo.toml

@@ -20,10 +20,16 @@ include = [
 name = "challenge_response"
 path = "src/lib.rs"
 
+[features]
+rusb = ["dep:rusb"]
+nusb = ["dep:nusb"]
+default = ["rusb"]
+
 [dependencies]
 rand = "0.8"
 bitflags = "2.4"
-rusb = "0.9"
+rusb = { version = "0.9", optional = true }
+nusb = { version = "0.1", optional = true }
 structure = "0.1"
 aes = "0.8"
 block-modes = "0.9"

src/configure.rs

@@ -1,9 +1,9 @@
 use config::Command;
 use hmacmode::HmacKey;
-use manager::Frame;
 use otpmode::Aes128Key;
 use sec::crc16;
 use std;
+use usb::Frame;
 
 const FIXED_SIZE: usize = 16;
 const UID_SIZE: usize = 6;
@@ -48,7 +48,7 @@ const SIZEOF_CONFIG: usize = 52;
 impl DeviceModeConfig {
     #[doc(hidden)]
     pub fn to_frame(&mut self, command: Command) -> Frame {
-        let mut payload = [0; crate::manager::PAYLOAD_SIZE];
+        let mut payload = [0; crate::usb::PAYLOAD_SIZE];
         // First set CRC.
         self.crc = {
             let first_fields = unsafe {

src/error.rs

@@ -1,3 +1,4 @@
+#[cfg(feature = "rusb")]
 use rusb::Error as usbError;
 use std::error;
 use std::fmt;
@@ -6,11 +7,13 @@ use std::io::Error as ioError;
 #[derive(Debug)]
 pub enum ChallengeResponseError {
     IOError(ioError),
+    #[cfg(feature = "rusb")]
     UsbError(usbError),
     CommandNotSupported,
     DeviceNotFound,
     OpenDeviceError,
     CanNotWriteToDevice,
+    CanNotReadFromDevice,
     WrongCRC,
     ConfigNotWritten,
 }
@@ -19,12 +22,14 @@ impl fmt::Display for ChallengeResponseError {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match *self {
             ChallengeResponseError::IOError(ref err) => write!(f, "IO error: {}", err),
+            #[cfg(feature = "rusb")]
             ChallengeResponseError::UsbError(ref err) => write!(f, "USB  error: {}", err),
             ChallengeResponseError::DeviceNotFound => write!(f, "Device not found"),
             ChallengeResponseError::OpenDeviceError => write!(f, "Can not open device"),
             ChallengeResponseError::CommandNotSupported => write!(f, "Command Not Supported"),
             ChallengeResponseError::WrongCRC => write!(f, "Wrong CRC"),
             ChallengeResponseError::CanNotWriteToDevice => write!(f, "Can not write to Device"),
+            ChallengeResponseError::CanNotReadFromDevice => write!(f, "Can not read from Device"),
             ChallengeResponseError::ConfigNotWritten => write!(f, "Configuration has failed"),
         }
     }
@@ -33,6 +38,7 @@ impl fmt::Display for ChallengeResponseError {
 impl error::Error for ChallengeResponseError {
     fn cause(&self) -> Option<&dyn error::Error> {
         match *self {
+            #[cfg(feature = "rusb")]
             ChallengeResponseError::UsbError(ref err) => Some(err),
             _ => None,
         }
@@ -45,6 +51,7 @@ impl From<ioError> for ChallengeResponseError {
     }
 }
 
+#[cfg(feature = "rusb")]
 impl From<usbError> for ChallengeResponseError {
     fn from(err: usbError) -> ChallengeResponseError {
         ChallengeResponseError::UsbError(err)