124 lines
3.7 KiB
Rust
124 lines
3.7 KiB
Rust
// Copyright 2015, 2016 Parity Technologies (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 as well as common hash constants.
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extern crate sha3 as sha3_ext;
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use std::io;
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use tiny_keccak::Keccak;
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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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/// The SHA3 of the RLP encoding of empty data.
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pub const SHA3_NULL_RLP: H256 = H256( [0x56, 0xe8, 0x1f, 0x17, 0x1b, 0xcc, 0x55, 0xa6, 0xff, 0x83, 0x45, 0xe6, 0x92, 0xc0, 0xf8, 0x6e, 0x5b, 0x48, 0xe0, 0x1b, 0x99, 0x6c, 0xad, 0xc0, 0x01, 0x62, 0x2f, 0xb5, 0xe3, 0x63, 0xb4, 0x21] );
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/// The SHA3 of the RLP encoding of empty list.
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pub const SHA3_EMPTY_LIST_RLP: H256 = H256( [0x1d, 0xcc, 0x4d, 0xe8, 0xde, 0xc7, 0x5d, 0x7a, 0xab, 0x85, 0xb5, 0x67, 0xb6, 0xcc, 0xd4, 0x1a, 0xd3, 0x12, 0x45, 0x1b, 0x94, 0x8a, 0x74, 0x13, 0xf0, 0xa1, 0x42, 0xfd, 0x40, 0xd4, 0x93, 0x47] );
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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: AsRef<[u8]> {
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fn sha3(&self) -> H256 {
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let mut ret: H256 = H256::zero();
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self.sha3_into(&mut *ret);
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ret
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}
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fn sha3_into(&self, dest: &mut [u8]) {
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let input: &[u8] = self.as_ref();
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unsafe {
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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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/// Calculate SHA3 of given stream.
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pub fn sha3(r: &mut io::BufRead) -> Result<H256, io::Error> {
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let mut output = [0u8; 32];
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let mut input = [0u8; 1024];
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let mut sha3 = Keccak::new_keccak256();
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// read file
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loop {
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let some = try!(r.read(&mut input));
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if some == 0 {
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break;
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}
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sha3.update(&input[0..some]);
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}
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sha3.finalize(&mut output);
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Ok(output.into())
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}
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#[cfg(test)]
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mod tests {
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use std::fs;
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use std::io::{Write, BufReader};
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use super::*;
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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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#[test]
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fn should_sha3_a_file() {
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// given
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use devtools::RandomTempPath;
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let path = RandomTempPath::new();
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// Prepare file
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{
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let mut file = fs::File::create(&path).unwrap();
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file.write_all(b"something").unwrap();
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}
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let mut file = BufReader::new(fs::File::open(&path).unwrap());
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// when
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let hash = sha3(&mut file).unwrap();
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// then
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assert_eq!(format!("{:?}", hash), "68371d7e884c168ae2022c82bd837d51837718a7f7dfb7aa3f753074a35e1d87");
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}
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}
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