Argon2 password hashing wrapper for Erlang.

Argon2 is a password-hashing function that summarizes the state of the art in the design of memory-hard functions and can be used to hash passwords for credential storage, key derivation, or other applications.

It has a simple design aimed at the highest memory filling rate and effective use of multiple computing units, while still providing defense against tradeoff attacks (by exploiting the cache and memory organization of the recent processors).

The Argon2 document gives detailed specs and design rationale.

eArgon2 supports OTP release 20 and later with dirty scheduler enabled.

This is because eArgon2 is using ERL_NIF_DIRTY_JOB_CPU_BOUND. However we are working on a new version that will bypass this limitation.

Dirty NIF support is available only when the emulator is configured with dirty scheduler support.

As of ERTS version 9.0, dirty scheduler support is enabled by default on the runtime system with SMP support.

The Erlang runtime without SMP support does not support dirty schedulers even when the dirty scheduler support is explicitly enabled. To check at runtime for the presence of dirty scheduler threads, code can use the enif_system_info() API function.

Install OTP release 20 or later. Install all common Development Tools (make, gcc).

> git clone https://github.com/ergenius/eargon2.git eargon2
> cd eargon2
> git submodule update --init --recursive
> make

%% Don't forget to include eargon2.hrl in your erlang module
%% for getting access to all eargon2 definitions.
include_lib("eargon2.hrl").

%% Hash
HashResult = eargon2:hash(TCost, MCost, Parallelism, Pwd, Salt, HashLen, ?EARGON2_RESULT_TYPE_BOTH, ?EARGON2_HASH_TYPE_ARGON2_D, ?EARGON2_VERSION_NUMBER);
case HashResult of 
	{ok, RawHash, EncodedHash} -> do_something;
	{error, ErrorCode} -> do_nothing
end.	

%% Verify
case eargon2:verify(EncodedHash, Pwd) of 
	ok -> do_something;
	{error, ErrorCode} -> stop_doing_anything
end.	

Creating a new Cryptocurrency written in Erlang.

1. Continuously fix bugs and tune performance.
2. Write more testing units.
3. Finish and improve documentation.
4. Find alternatives for older Erlang versions not supporting ERL_NIF_DIRTY_JOB_CPU_BOUND
5. Update project when Argon2 library is updated.

Except for the components listed below, the Erlang Argon2 wrapper code included in this repository is copyright (c) 2018 Madalin Grigore-Enescu and dual licensed under the CC0 License and the Apache 2.0 License. For more info see the LICENSE file.

The C implementation of Argon2 is copyright (c) 2015 Daniel Dinu, Dmitry Khovratovich (main authors), Jean-Philippe Aumasson and Samuel Neves, and dual licensed under the CC0 License and the Apache 2.0 License.

The string encoding routines in argon2/src/encoding.c are copyright (c) 2015 Thomas Pornin, and under CC0 License.

The BLAKE2 code in argon2/src/blake2/ is copyright (c) Samuel Neves, 2013-2015, and under CC0 License.

All licenses are therefore GPL-compatible.