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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;
    use secp256k1::key;
    use rustc_serialize::hex::ToHex;
    use keccak::Keccak256;
    use super::{Secret, Public, Address, SECP256K1, Error};

    pub fn public_to_address(public: &Public) -> Address {
    	let hash = public.keccak256();
    	let mut result = Address::default();
    	result.copy_from_slice(&hash[12..]);
    	result
    }

    /// secp256k1 key pair
    pub struct KeyPair {
    	secret: Secret,
    	public: Public,
    }

    impl fmt::Display for KeyPair {
    	fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
    		writeln!(f, "secret:  {}", self.secret.to_hex())?;
    		writeln!(f, "public:  {}", self.public.to_hex())?;
    		write!(f, "address: {}", self.address().to_hex())
    	}
    }

    impl KeyPair {
    	/// Create a pair from secret key
    	pub fn from_secret(secret: Secret) -> Result<KeyPair, Error> {
    		let context = &SECP256K1;
    		let s: key::SecretKey = key::SecretKey::from_slice(context, &secret[..])?;
    		let pub_key = key::PublicKey::from_secret_key(context, &s)?;
    		let serialized = pub_key.serialize_vec(context, false);

    		let mut public = Public::default();
    		public.copy_from_slice(&serialized[1..65]);

    		let keypair = KeyPair {
    			secret: secret,
    			public: public,
    		};

    		Ok(keypair)
    	}

    	pub fn from_secret_slice(slice: &[u8]) -> Result<KeyPair, Error> {
    		Self::from_secret(Secret::from_slice(slice)?)
    	}

    	pub fn from_keypair(sec: key::SecretKey, publ: key::PublicKey) -> Self {
    		let context = &SECP256K1;
    		let serialized = publ.serialize_vec(context, false);
    		let secret = Secret::from(sec);
    		let mut public = Public::default();
    		public.copy_from_slice(&serialized[1..65]);

    		KeyPair {
    			secret: secret,
    			public: public,
    		}
    	}

    	pub fn secret(&self) -> &Secret {
    		&self.secret
    	}

    	pub fn public(&self) -> &Public {
    		&self.public
    	}

    	pub fn address(&self) -> Address {
    		public_to_address(&self.public)
    	}
    }

    #[cfg(test)]
    mod tests {
    	use std::str::FromStr;
    	use {KeyPair, Secret};

    	#[test]
    	fn from_secret() {
    		let secret = Secret::from_str("a100df7a048e50ed308ea696dc600215098141cb391e9527329df289f9383f65").unwrap();
    		let _ = KeyPair::from_secret(secret).unwrap();
    	}

    	#[test]
    	fn keypair_display() {
    		let expected =
    "secret:  a100df7a048e50ed308ea696dc600215098141cb391e9527329df289f9383f65
    public:  8ce0db0b0359ffc5866ba61903cc2518c3675ef2cf380a7e54bde7ea20e6fa1ab45b7617346cd11b7610001ee6ae5b0155c41cad9527cbcdff44ec67848943a4
    address: 5b073e9233944b5e729e46d618f0d8edf3d9c34a".to_owned();
    		let secret = Secret::from_str("a100df7a048e50ed308ea696dc600215098141cb391e9527329df289f9383f65").unwrap();
    		let kp = KeyPair::from_secret(secret).unwrap();
    		assert_eq!(format!("{}", kp), expected);
    	}
    }

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