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This is a purely Rust-based library that provides both variants of the state-of-the-art Argon2 hashing algorithm, suitable for password hashing and password-based key derivation.



Via cargo:

$ cargo install --features "simd"

From git:

$ git clone $ARGON_DIR && cd $ARGON_DIR
$ cargo build --features "simd"


From examples/

extern crate argon2rs;

pub fn main() {
    let (password, salt) = ("argon2i!", "delicious salt");
    println!("argon2i_simple(\"{}\", \"{}\"):", password, salt);
    for byte in argon2rs::argon2i_simple(&password, &salt).iter() {
        print!("{:02x}", byte);


argon2i_simple("argon2i!", "delicious salt"):

There are two variants of Argon2 that differ in the manner by which reference indices are computed during block-filling rounds. Argon2d does this in a faster but data-dependent fashion that could be vulnerable to side-channel attacks, whereas Argon2i ("i" denoting independence from plaintext input) works slower but is immune to such attacks and is therefore the preferred choice for password hashing.


  • [x] Parallelize.
  • [x] Incorporate SIMD into compression function.
  • [x] Zero-on-drop trait for sensitive(s): Matrix
  • [x] Constant-time verification API.
  • [x] Benchmarks.
  • [ ] Support NEON and SIMD on other arches.
  • [ ] Fuzz.
  • [ ] Prove safety of unchecked accesses in Block, Matrix.


Our primary benchmarks are single- and multi-threaded runs of Argon2i with default parameters against the reference implementation. In order to compile and run this, first pull in the C sources:

$ git submodule init
$ git submodule update benches/cargon/phc-winner-argon2

and then benchmark with Cargo as usual:

$ rustc --version
rustc 1.11.0-dev (4b240fe96 2016-06-08)

$ export RUSTFLAGS='-C target-feature=+avx'
$ cargo bench --features="simd bench_ref"

# output trimmed for brevity

     Running target/release/versus_cargon-b5955411e1594c85

running 5 tests
test ensure_identical_hashes ... ignored
test bench_argon2rs_i        ... bench:   9,547,031 ns/iter (+/- 15,964)
test bench_argon2rs_threaded ... bench:   4,584,163 ns/iter (+/- 398,803)
test bench_cargon_i          ... bench:  10,013,015 ns/iter (+/- 177,482)
test bench_cargon_threaded   ... bench:   3,753,022 ns/iter (+/- 48,688)

test result: ok. 0 passed; 0 failed; 0 ignored; 2 measured


"Argon2: The Memory-Hard Function for Password Hashing and Other Applications"

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