An implementation of the BLAKE2(b/s/bp/sp) family of hash functions with:

100% stable Rust.
SIMD implementations based on Samuel Neves' blake2-avx2. These are very fast. See the Performance section below.
Portable, safe implementations for other platforms.
Dynamic CPU feature detection. Binaries include multiple implementations by default and choose the fastest one the processor supports at runtime.
All the features from the the BLAKE2 spec, like adjustable length, keying, and associated data for tree hashing.
The blake2 command line utility, published as the blake2_bin crate, with command line flags for all the BLAKE2 variants and associated data features.
no_std support. The std Cargo feature is on by default, for CPU feature detection and for implementing std::io::Write.
Support for computing multiple BLAKE2b and BLAKE2s hashes in parallel, matching the efficiency of BLAKE2bp and BLAKE2sp. See the many module in each crate.

Example

use blake2b_simd::{blake2b, Params};
let expected = "ca002330e69d3e6b84a46a56a6533fd79d51d97a3bb7cad6c2ff43b354185d6d\
                c1e723fb3db4ae0737e120378424c714bb982d9dc5bbd7a0ab318240ddd18f8d";
let hash = blake2b(b"foo");
assert_eq!(expected, &hash.to_hex());
let hash = Params::new()
    .hash_length(16)
    .key(b"The Magic Words are Squeamish Ossifrage")
    .personal(b"L. P. Waterhouse")
    .to_state()
    .update(b"foo")
    .update(b"bar")
    .update(b"baz")
    .finalize();
assert_eq!("ee8ff4e9be887297cf79348dc35dab56", &hash.to_hex());

An example using the included blake2 command line utility:

$ cargo install blake2_bin
$ echo hi | blake2 -sp
49228db2a2fa8d25e8b3b2aca5a70234c71490516eaca9cba007b27d59c532b8

To run small benchmarks yourself, run cargo +nightly bench. If you have OpenSSL, libsodium, and Clang installed on your machine, you can add --all-features to include comparison benchmarks with other native libraries.

The benches/bench_multiprocess sub-crate runs various hash functions on long inputs in memory and tries to average over many sources of variability. Here are the results from my laptop for cargo run --release (lower is better):

Intel Core i5-8250U (Kaby Lake Refresh)
libsodium version 1.0.18
OpenSSL version 1.1.1.d
rustc 1.40.0
clang 9.0.1

╭─────────────────────────┬──────────╮
│ BLAKE3                  │ 0.95 cpb │
│ blake2s_simd many::hash │ 1.31 cpb │
│ blake2s_simd BLAKE2sp   │ 1.32 cpb │
│ blake2b_simd many::hash │ 1.43 cpb │
│ blake2b_simd BLAKE2bp   │ 1.44 cpb │
│ blake2b_simd BLAKE2b    │ 2.81 cpb │
│ libsodium BLAKE2b       │ 3.07 cpb │
│ OpenSSL SHA-1           │ 3.51 cpb │
│ blake2s_simd BLAKE2s    │ 4.66 cpb │
│ OpenSSL SHA-512         │ 5.11 cpb │
╰─────────────────────────┴──────────╯

Example

Links