challenge_response 0.5.46

Perform HMAC-SHA1 and OTP challenges with YubiKey, OnlyKey and NitroKey, in pure Rust.
Documentation 
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#[cfg(all(feature = "nusb", not(target_os = "windows")))]
use nusb::Error as nusbError;
#[cfg(any(feature = "rusb", target_os = "windows"))]
use rusb::Error as usbError;
use std::error;
use std::fmt;
use std::io::Error as ioError;

#[derive(Debug)]
pub enum ChallengeResponseError {
    IOError(ioError),
    #[cfg(any(feature = "rusb", target_os = "windows"))]
    UsbError(usbError),
    #[cfg(all(feature = "nusb", not(target_os = "windows")))]
    NusbError(nusbError),
    CommandNotSupported,
    DeviceNotFound,
    OpenDeviceError,
    CanNotWriteToDevice,
    CanNotReadFromDevice,
    WrongCRC,
    ConfigNotWritten,
    ListDevicesError,
}

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(any(feature = "rusb", target_os = "windows"))]
            ChallengeResponseError::UsbError(ref err) => write!(f, "USB  error: {}", err),
            #[cfg(all(feature = "nusb", not(target_os = "windows")))]
            ChallengeResponseError::NusbError(ref err) => write!(f, "NUSB 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"),
            ChallengeResponseError::ListDevicesError => write!(f, "Could not list available devices"),
        }
    }
}

impl error::Error for ChallengeResponseError {
    fn cause(&self) -> Option<&dyn error::Error> {
        match *self {
            #[cfg(any(feature = "rusb", target_os = "windows"))]
            ChallengeResponseError::UsbError(ref err) => Some(err),
            #[cfg(all(feature = "nusb", not(target_os = "windows")))]
            ChallengeResponseError::NusbError(ref err) => Some(err),
            _ => None,
        }
    }
}

impl From<ioError> for ChallengeResponseError {
    fn from(err: ioError) -> ChallengeResponseError {
        ChallengeResponseError::IOError(err)
    }
}

#[cfg(any(feature = "rusb", target_os = "windows"))]
impl From<usbError> for ChallengeResponseError {
    fn from(err: usbError) -> ChallengeResponseError {
        ChallengeResponseError::UsbError(err)
    }
}

#[cfg(all(feature = "nusb", not(target_os = "windows")))]
impl From<nusbError> for ChallengeResponseError {
    fn from(err: nusbError) -> ChallengeResponseError {
        ChallengeResponseError::NusbError(err)
    }
}