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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 json;

    #[derive(Debug, PartialEq, Clone)]
    pub enum Prf {
    	HmacSha256,
    }

    #[derive(Debug, PartialEq, Clone)]
    pub struct Pbkdf2 {
    	pub c: u32,
    	pub dklen: u32,
    	pub prf: Prf,
    	pub salt: [u8; 32],
    }

    #[derive(Debug, PartialEq, Clone)]
    pub struct Scrypt {
    	pub dklen: u32,
    	pub p: u32,
    	pub n: u32,
    	pub r: u32,
    	pub salt: [u8; 32],
    }

    #[derive(Debug, PartialEq, Clone)]
    pub enum Kdf {
    	Pbkdf2(Pbkdf2),
    	Scrypt(Scrypt),
    }

    impl From<json::Prf> for Prf {
    	fn from(json: json::Prf) -> Self {
    		match json {
    			json::Prf::HmacSha256 => Prf::HmacSha256,
    		}
    	}
    }

    impl Into<json::Prf> for Prf {
    	fn into(self) -> json::Prf {
    		match self {
    			Prf::HmacSha256 => json::Prf::HmacSha256,
    		}
    	}
    }

    impl From<json::Pbkdf2> for Pbkdf2 {
    	fn from(json: json::Pbkdf2) -> Self {
    		Pbkdf2 {
    			c: json.c,
    			dklen: json.dklen,
    			prf: From::from(json.prf),
    			salt: json.salt.into(),
    		}
    	}
    }

    impl Into<json::Pbkdf2> for Pbkdf2 {
    	fn into(self) -> json::Pbkdf2 {
    		json::Pbkdf2 {
    			c: self.c,
    			dklen: self.dklen,
    			prf: self.prf.into(),
    			salt: From::from(self.salt),
    		}
    	}
    }

    impl From<json::Scrypt> for Scrypt {
    	fn from(json: json::Scrypt) -> Self {
    		Scrypt {
    			dklen: json.dklen,
    			p: json.p,
    			n: json.n,
    			r: json.r,
    			salt: json.salt.into(),
    		}
    	}
    }

    impl Into<json::Scrypt> for Scrypt {
    	fn into(self) -> json::Scrypt {
    		json::Scrypt {
    			dklen: self.dklen,
    			p: self.p,
    			n: self.n,
    			r: self.r,
    			salt: From::from(self.salt),
    		}
    	}
    }

    impl From<json::Kdf> for Kdf {
    	fn from(json: json::Kdf) -> Self {
    		match json {
    			json::Kdf::Pbkdf2(params) => Kdf::Pbkdf2(From::from(params)),
    			json::Kdf::Scrypt(params) => Kdf::Scrypt(From::from(params)),
    		}
    	}
    }

    impl Into<json::Kdf> for Kdf {
    	fn into(self) -> json::Kdf {
    		match self {
    			Kdf::Pbkdf2(params) => json::Kdf::Pbkdf2(params.into()),
    			Kdf::Scrypt(params) => json::Kdf::Scrypt(params.into()),
    		}
    	}
    }

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