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extern crate sha3 as sha3_ext;
use std::io;
use tiny_keccak::Keccak;
use hash::{H256, FixedHash};
use self::sha3_ext::*;
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] );
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] );
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] );
pub trait Hashable {
fn sha3(&self) -> H256;
fn sha3_into(&self, dest: &mut [u8]) {
self.sha3().copy_to(dest);
}
}
impl<T> Hashable for T where T: AsRef<[u8]> {
fn sha3(&self) -> H256 {
let mut ret: H256 = H256::zero();
self.sha3_into(&mut *ret);
ret
}
fn sha3_into(&self, dest: &mut [u8]) {
let input: &[u8] = self.as_ref();
unsafe {
sha3_256(dest.as_mut_ptr(), dest.len(), input.as_ptr(), input.len());
}
}
}
pub fn sha3(r: &mut io::BufRead) -> Result<H256, io::Error> {
let mut output = [0u8; 32];
let mut input = [0u8; 1024];
let mut sha3 = Keccak::new_keccak256();
loop {
let some = r.read(&mut input)?;
if some == 0 {
break;
}
sha3.update(&input[0..some]);
}
sha3.finalize(&mut output);
Ok(output.into())
}
#[cfg(test)]
mod tests {
use std::fs;
use std::io::{Write, BufReader};
use super::*;
#[test]
fn sha3_empty() {
assert_eq!([0u8; 0].sha3(), SHA3_EMPTY);
}
#[test]
fn sha3_as() {
assert_eq!([0x41u8; 32].sha3(), From::from("59cad5948673622c1d64e2322488bf01619f7ff45789741b15a9f782ce9290a8"));
}
#[test]
fn should_sha3_a_file() {
use devtools::RandomTempPath;
let path = RandomTempPath::new();
{
let mut file = fs::File::create(&path).unwrap();
file.write_all(b"something").unwrap();
}
let mut file = BufReader::new(fs::File::open(&path).unwrap());
let hash = sha3(&mut file).unwrap();
assert_eq!(format!("{:?}", hash), "68371d7e884c168ae2022c82bd837d51837718a7f7dfb7aa3f753074a35e1d87");
}
}