twopoint 0.1.0

Encrypted UDP messaging between two endpoints using AES-128-GCM
Documentation 
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use std::io;

/// Opaque error for encryption and decryption failures.
///
/// This error is returned when AES-GCM operations fail, typically due to
/// corrupted data or authentication failures.
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Default)]
pub struct CryptoError;

impl From<aes_gcm::Error> for CryptoError {
  fn from(_: aes_gcm::Error) -> Self {
    Self
  }
}

impl From<CryptoError> for io::Error {
  fn from(_: CryptoError) -> Self {
      io::Error::new(io::ErrorKind::Other, CryptoError)
  }
}

impl std::fmt::Display for CryptoError {
  fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
    write!(f, "opaque crypto error")
  }
}

impl std::error::Error for CryptoError {}

/// Error returned when a key cannot be parsed or has an invalid format.
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum InvalidKeyError {
  /// The key length is not exactly 16 bytes.
  InvalidLength,
  /// The key contains invalid hexadecimal characters.
  InvalidHex(hex::FromHexError),
}

impl From<hex::FromHexError> for InvalidKeyError {
  fn from(e: hex::FromHexError) -> Self {
    Self::InvalidHex(e)
  }
}

impl From<InvalidKeyError> for io::Error {
  fn from(e: InvalidKeyError) -> Self {
      io::Error::new(io::ErrorKind::InvalidInput, e)
  }
}

impl std::fmt::Display for InvalidKeyError {
  fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
    match self {
      Self::InvalidLength => write!(f, "invalid key length"),
      Self::InvalidHex(e) => write!(f, "invalid key hex: {e}"),
    }
  }
}

impl std::error::Error for InvalidKeyError {}