openethereum/ethcore/crypto/src/digest.rs

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// Copyright 2015-2018 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 rcrypto::ripemd160;
use ring::digest::{self, Context, SHA256, SHA512};
use std::marker::PhantomData;
use std::ops::Deref;
/// The message digest.
pub struct Digest<T>(InnerDigest, PhantomData<T>);
enum InnerDigest {
Ring(digest::Digest),
Ripemd160([u8; 20]),
}
impl<T> Deref for Digest<T> {
type Target = [u8];
fn deref(&self) -> &Self::Target {
match self.0 {
InnerDigest::Ring(ref d) => d.as_ref(),
InnerDigest::Ripemd160(ref d) => &d[..]
}
}
}
/// Single-step sha256 digest computation.
pub fn sha256(data: &[u8]) -> Digest<Sha256> {
Digest(InnerDigest::Ring(digest::digest(&SHA256, data)), PhantomData)
}
/// Single-step sha512 digest computation.
pub fn sha512(data: &[u8]) -> Digest<Sha512> {
Digest(InnerDigest::Ring(digest::digest(&SHA512, data)), PhantomData)
}
/// Single-step ripemd160 digest computation.
pub fn ripemd160(data: &[u8]) -> Digest<Ripemd160> {
let mut hasher = Hasher::ripemd160();
hasher.update(data);
hasher.finish()
}
pub enum Sha256 {}
pub enum Sha512 {}
pub enum Ripemd160 {}
/// Stateful digest computation.
pub struct Hasher<T>(Inner, PhantomData<T>);
enum Inner {
Ring(Context),
Ripemd160(ripemd160::Ripemd160)
}
impl Hasher<Sha256> {
pub fn sha256() -> Hasher<Sha256> {
Hasher(Inner::Ring(Context::new(&SHA256)), PhantomData)
}
}
impl Hasher<Sha512> {
pub fn sha512() -> Hasher<Sha512> {
Hasher(Inner::Ring(Context::new(&SHA512)), PhantomData)
}
}
impl Hasher<Ripemd160> {
pub fn ripemd160() -> Hasher<Ripemd160> {
Hasher(Inner::Ripemd160(ripemd160::Ripemd160::new()), PhantomData)
}
}
impl<T> Hasher<T> {
pub fn update(&mut self, data: &[u8]) {
match self.0 {
Inner::Ring(ref mut ctx) => ctx.update(data),
Inner::Ripemd160(ref mut ctx) => {
use rcrypto::digest::Digest;
ctx.input(data)
}
}
}
pub fn finish(self) -> Digest<T> {
match self.0 {
Inner::Ring(ctx) => Digest(InnerDigest::Ring(ctx.finish()), PhantomData),
Inner::Ripemd160(mut ctx) => {
use rcrypto::digest::Digest;
let mut d = [0; 20];
ctx.result(&mut d);
Digest(InnerDigest::Ripemd160(d), PhantomData)
}
}
}
}