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    // Copyright 2015-2017 Parity Technologies (UK) Ltd.
    // This file is part of Parity.

    // Parity is free software: you can redistribute it and/or modify
    // it under the terms of the GNU General Public License as published by
    // the Free Software Foundation, either version 3 of the License, or
    // (at your option) any later version.

    // Parity 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 General Public License for more details.

    // You should have received a copy of the GNU General Public License
    // along with Parity.  If not, see <http://www.gnu.org/licenses/>.

    use std::fmt;

    #[derive(Debug)]
    /// Crypto error
    pub enum Error {
    	/// Invalid secret key
    	InvalidSecret,
    	/// Invalid public key
    	InvalidPublic,
    	/// Invalid address
    	InvalidAddress,
    	/// Invalid EC signature
    	InvalidSignature,
    	/// Invalid AES message
    	InvalidMessage,
    	/// IO Error
    	Io(::std::io::Error),
    	/// Custom
    	Custom(String),
    }

    impl fmt::Display for Error {
    	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
    		let msg = match *self {
    			Error::InvalidSecret => "Invalid secret".into(),
    			Error::InvalidPublic => "Invalid public".into(),
    			Error::InvalidAddress => "Invalid address".into(),
    			Error::InvalidSignature => "Invalid EC signature".into(),
    			Error::InvalidMessage => "Invalid AES message".into(),
    			Error::Io(ref err) => format!("I/O error: {}", err),
    			Error::Custom(ref s) => s.clone(),
    		};

    		f.write_fmt(format_args!("Crypto error ({})", msg))
    	}
    }

    impl From<::secp256k1::Error> for Error {
    	fn from(e: ::secp256k1::Error) -> Error {
    		match e {
    			::secp256k1::Error::InvalidMessage => Error::InvalidMessage,
    			::secp256k1::Error::InvalidPublicKey => Error::InvalidPublic,
    			::secp256k1::Error::InvalidSecretKey => Error::InvalidSecret,
    			_ => Error::InvalidSignature,
    		}
    	}
    }

    impl From<::std::io::Error> for Error {
    	fn from(err: ::std::io::Error) -> Error {
    		Error::Io(err)
    	}
    }

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