tiny-keccak

An implementation of sha3, shake, keccak and KangarooTwelve functions.

Documentation

The Keccak-f[1600] permutation is fully unrolled; it's nearly as fast as the Keccak team's optimized permutation.

Building

cargo build

Usage

Add this to your Cargo.toml:

[dependencies]
tiny-keccak = "1.5"

Example

use tiny_keccak::Keccak;

fn main() {
    let mut sha3 = Keccak::new_sha3_256();

    sha3.update("hello".as_ref());
    sha3.update(&[b' ']);
    sha3.update("world".as_ref());

    let mut res: [u8; 32] = [0; 32];
    sha3.finalize(&mut res);

    let expected: &[u8] = &[
        0x64, 0x4b, 0xcc, 0x7e, 0x56, 0x43, 0x73, 0x04,
        0x09, 0x99, 0xaa, 0xc8, 0x9e, 0x76, 0x22, 0xf3,
        0xca, 0x71, 0xfb, 0xa1, 0xd9, 0x72, 0xfd, 0x94,
        0xa3, 0x1c, 0x3b, 0xfb, 0xf2, 0x4e, 0x39, 0x38
    ];

    assert_eq!(&res, expected);
}

Benchmarks

Benchmarked with rust-crypto sha3 on:

MacBook Pro (Retina, 15-inch, Mid 2015)
2,5 GHz Intel Core i7
16 GB 1600 MHz DDR3
Intel Iris Pro 1536 MB

Benchmark code is available here

running 4 tests
test rust_crypto_sha3_256_input_32_bytes   ... bench:         677 ns/iter (+/- 113) = 47 MB/s
test rust_crypto_sha3_256_input_4096_bytes ... bench:      17,619 ns/iter (+/- 4,174) = 232 MB/s
test tiny_keccak_sha3_256_input_32_bytes   ... bench:         569 ns/iter (+/- 204) = 56 MB/s
test tiny_keccak_sha3_256_input_4096_bytes ... bench:      17,185 ns/iter (+/- 4,575) = 238 MB/s

Why tiny-keccak is twice faster? It's optimized with:

• loop unwinding
• removed bounds checking