ecdh_wrapper 0.0.9

ECDH wrapper library
Documentation 
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// errors.rs - ecdh errors
// Copyright (C) 2018  David Anthony Stainton.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

use std::error::{Error};
use std::fmt;


#[derive(Debug)]
pub enum KeyError {
    InvalidKeyType,
    InvalidSize,
    InvalidPublicKey,
    PemError(pem::Error),
    IoError(std::io::Error),
}

impl fmt::Display for KeyError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        use self::KeyError::*;
        match self {
            InvalidKeyType => write!(f, "Invalid key type."),
            InvalidSize => write!(f, "Invalid authentication message size."),
            InvalidPublicKey => write!(f, "The given public key was invalid."),
            IoError(x) => x.fmt(f),
            PemError(x) => x.fmt(f),
        }
    }
}


impl Error for KeyError {
    fn description(&self) -> &str {
        "I'm a command error."
    }

    fn cause(&self) -> Option<&Error> {
        use self::KeyError::*;
        match self {
            InvalidKeyType => None,
            InvalidSize => None,
            InvalidPublicKey => None,
            IoError(x) => x.source(),
            PemError(x) => x.source(),
        }
    }
}

impl From<std::io::Error> for KeyError {
    fn from(error: std::io::Error) -> Self {
        KeyError::IoError(error)
    }
}

impl From<pem::Error> for KeyError {
    fn from(error: pem::Error) -> Self {
        KeyError::PemError(error)
    }
}