76 lines
2.3 KiB
Rust
76 lines
2.3 KiB
Rust
// Copyright 2015, 2016 Ethcore (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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//! Wrapper around tiny-keccak crate.
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extern crate sha3 as sha3_ext;
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use std::mem::uninitialized;
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use bytes::{BytesConvertable, Populatable};
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use hash::{H256, FixedHash};
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use self::sha3_ext::*;
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/// Get the SHA3 (i.e. Keccak) hash of the empty bytes string.
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pub const SHA3_EMPTY: H256 = H256( [0xc5, 0xd2, 0x46, 0x01, 0x86, 0xf7, 0x23, 0x3c, 0x92, 0x7e, 0x7d, 0xb2, 0xdc, 0xc7, 0x03, 0xc0, 0xe5, 0x00, 0xb6, 0x53, 0xca, 0x82, 0x27, 0x3b, 0x7b, 0xfa, 0xd8, 0x04, 0x5d, 0x85, 0xa4, 0x70] );
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/// Types implementing this trait are sha3able.
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///
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/// ```
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/// extern crate ethcore_util as util;
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/// use std::str::FromStr;
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/// use util::sha3::*;
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/// use util::hash::*;
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///
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/// fn main() {
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/// assert_eq!([0u8; 0].sha3(), H256::from_str("c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470").unwrap());
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/// }
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/// ```
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pub trait Hashable {
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/// Calculate SHA3 of this object.
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fn sha3(&self) -> H256;
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/// Calculate SHA3 of this object and place result into dest.
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fn sha3_into(&self, dest: &mut [u8]) {
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self.sha3().copy_to(dest);
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}
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}
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impl<T> Hashable for T where T: BytesConvertable {
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fn sha3(&self) -> H256 {
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unsafe {
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let mut ret: H256 = uninitialized();
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self.sha3_into(ret.as_slice_mut());
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ret
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}
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}
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fn sha3_into(&self, dest: &mut [u8]) {
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unsafe {
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let input: &[u8] = self.as_slice();
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sha3_256(dest.as_mut_ptr(), dest.len(), input.as_ptr(), input.len());
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}
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}
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}
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#[test]
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fn sha3_empty() {
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assert_eq!([0u8; 0].sha3(), SHA3_EMPTY);
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}
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#[test]
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fn sha3_as() {
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assert_eq!([0x41u8; 32].sha3(), From::from("59cad5948673622c1d64e2322488bf01619f7ff45789741b15a9f782ce9290a8"));
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}
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