authnz-u2f 0.2.8

Rust FIDO U2F Library. Edited for Authnz
Documentation 
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use std::fmt;

#[derive(Debug)]
pub enum U2fError {
  Asm1DecoderError,
  BadSignature,
  RandomSecureBytesError,
  InvalidReservedByte,
  ChallengeExpired,
  WrongKeyHandler,
  InvalidClientData,
  InvalidSignatureData,
  InvalidUserPresenceByte,
  BadCertificate,
  NotTrustedAnchor,
  CounterTooLow,
  OpenSSLNoCurveName,
  InvalidPublicKey,
  WebpkiError(webpki::Error),
  RingError(ring::error::Unspecified),
}

impl fmt::Display for U2fError {
  fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
    match &self {
      U2fError::Asm1DecoderError => write!(f, "ASM1 Decoder error"),
      U2fError::BadSignature => write!(f, "Not able to verify signature"),
      U2fError::RandomSecureBytesError => write!(f, "Not able to generate random bytes"),
      U2fError::InvalidReservedByte => write!(f, "Invalid Reserved Byte"),
      U2fError::ChallengeExpired => write!(f, "Challenge Expired"),
      U2fError::WrongKeyHandler => write!(f, "Wrong Key Handler"),
      U2fError::InvalidClientData => write!(f, "Invalid Client Data"),
      U2fError::InvalidSignatureData => write!(f, "Invalid Signature Data"),
      U2fError::InvalidUserPresenceByte => write!(f, "Invalid User Presence Byte"),
      U2fError::BadCertificate => write!(f, "Failed to parse certificate"),
      U2fError::NotTrustedAnchor => write!(f, "Not Trusted Anchor"),
      U2fError::CounterTooLow => write!(f, "Counter too low"),
      U2fError::InvalidPublicKey => write!(f, "Invalid public key"),
      U2fError::OpenSSLNoCurveName => write!(f, "OpenSSL no curve name"),
      U2fError::WebpkiError(e) => e.fmt(f),
      U2fError::RingError(e) => e.fmt(f),
    }
  }
}