A Rust port of the password primitives used in Django Project.
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README.md

Rust DjangoHashers

Build Status

A Rust port of the password primitives used in Django Project.

Django's django.contrib.auth.models.User class has a few methods to deal with passwords, like set_password() and check_password(); DjangoHashers implements the primitive functions behind those methods. All Django's built-in hashers are supported.

This library was conceived for Django integration, but is not limited to it; you can use the password hash algorithm in any Rust project (or FFI integration), since its security model is already battle-tested.

TL;DR

Content of examples/tldr.rs:

extern crate djangohashers;
use djangohashers::*;

fn main() {
    let encoded = make_password("K2jitmJ3CBfo");
    println!("Hash: {:?}", encoded);
    let is_valid = check_password("K2jitmJ3CBfo", &encoded).unwrap();
    println!("Is valid: {:?}", is_valid);
}

Output:

$ cargo run --quiet --example tldr
Hash: "pbkdf2_sha256$30000$E2DtC4weM2DY$ZTso63dGXbq+QdVGUwq8Y05RgyUc3AsUSfswqUOZ3xc="
Is valid: true

Installation

Add the dependency to your Cargo.toml:

[dependencies]
djangohashers = "^1.0"

Reference and import:

extern crate djangohashers;

// Everything (it's not much):
use djangohashers::*;

// Or, just what you need:
use djangohashers::{check_password, make_password, Algorithm};

Compiling Features

New in 0.3.0.

By default all the hashers are enabled, but you can pick only the hashers that you need to avoid unneeded dependencies.

  • default: all hashers.
  • with_pbkdf2: only PBKDF2 and PBKDF2SHA1.
  • with_argon2: only Argon2.
  • with_bcrypt: only BCrypt and BCryptSHA256.
  • with_legacy: only SHA1, MD5, UnsaltedSHA1, UnsaltedMD5 and Crypt.
  • fpbkdf2: enables Fast PBKDF2 (requires OpenSSL, see below).
  • fuzzy_tests: only for development, enables fuzzy tests.

Fast PBKDF2 Version

Unfortunately rust-crypto’s implementation of PBKDF2 is not properly optimized: it does not adhere to the loop inlines and buffering used in modern implementations. The package fastpbkdf2 uses a C-binding of a library that requires OpenSSL.

Installation

Add the dependency to your Cargo.toml declaring the feature:

[dependencies.djangohashers]
version = "^1.0"
features = ["fpbkdf2"]

You need to install OpenSSL and set the environment variable to make it visible to the compiler; this changes depending on the operation system and package manager, for example, in macOS you may need to do something like this:

Via Homebrew:

$ brew install openssl
$ CFLAGS="-I/usr/local/opt/openssl/include" cargo ...

Via MacPorts:

$ sudo port install openssl
$ CFLAGS="-I/opt/local/include" cargo ...

For other OSs and package managers, follow the guide of how to install Python’s Cryptography dependencies, that also links against OpenSSL.

Performance

Method Encode or Check Performance
Django 1.9.4 29.5ms Baseline
djangohashers with rust-crypto 0.2.34 (default) 41.7ms 41% slower
djangohashers with fastpbkdf2 0.1.0 23.1ms 28% faster

Notes:

  • Best of 5 rounds of 100 events.
  • Built with --release.
  • PBKDF2 using SHA256 and iteration count set to 24000.
  • Django version tested with CPython 3.5.1
  • Rust/fastpbkdf2 version tested with Rust 1.6.0 and OpenSSL 1.0.2g.
  • iMac Mid 2010 with an Intel Core i3 3.2Ghz and 16GB of RAM, running OS X 10.11.3.

Compatibility

DjangoHashers passes all relevant unit tests from Django 1.4 to 2.2, there is even a line-by-line translation of tests/auth_tests/test_hashers.py.

What is not covered:

  • Upgrade/Downgrade callbacks.
  • Any 3rd-party hasher outside Django's code.
  • Some tests that makes no sense in idiomatic Rust.

Usage

API Documentation, thanks to docs.rs project!

Verifying a Hashed Password

Function signatures:

pub fn check_password(password: &str, encoded: &str) -> Result<bool, HasherError> {}
pub fn check_password_tolerant(password: &str, encoded: &str) -> bool {}

Complete version:

let password = "KRONOS"; // Sent by the user.
let encoded = "pbkdf2_sha256$24000$..."; // Fetched from DB.

match check_password(password, encoded) {
    Ok(valid) => {
        if valid {
            // Log the user in.
        } else {
            // Ask the user to try again.
        }
    }
    Err(error) => {
        // Deal with the error.
    }
}

Possible Errors:

  • HasherError::UnknownAlgorithm: anything not recognizable as an algorithm.
  • HasherError::BadHash: Hash string is corrupted.
  • HasherError::InvalidIterations: number of iterations is not a positive integer.
  • HasherError::EmptyHash: hash string is empty.
  • HasherError::InvalidArgon2Salt: Argon2 salt should be Base64 encoded.

If you want to automatically assume all errors as "invalid password", there is a shortcut for that:

if check_password_tolerant(password, encoded) {
	// Log the user in.
} else {
	// Ask the user to try again.
}

Generating a Hashed Password

Function signatures:

pub fn make_password(password: &str) -> String {}
pub fn make_password_with_algorithm(password: &str, algorithm: Algorithm) -> String {}
pub fn make_password_with_settings(password: &str, salt: &str, algorithm: Algorithm) -> String {}

Available algorithms:

  • Algorithm::PBKDF2 (default)
  • Algorithm::PBKDF2SHA1
  • Algorithm::Argon2
  • Algorithm::BCryptSHA256
  • Algorithm::BCrypt
  • Algorithm::SHA1
  • Algorithm::MD5
  • Algorithm::UnsaltedSHA1
  • Algorithm::UnsaltedMD5
  • Algorithm::Crypt

The algorithms follow the same Django naming model, minus the PasswordHasher suffix.

Using default settings (PBKDF2 algorithm, random salt):

let encoded = make_password("KRONOS");
// Returns something like:
// pbkdf2_sha256$24000$go9s3b1y1BTe$Pksk4EptJ84KDnI7ciocmhzFAb5lFoFwd6qlPOwwW4Q=

Using a defined algorithm (random salt):

let encoded = make_password_with_algorithm("KRONOS", Algorithm::BCryptSHA256);
// Returns something like:
// bcrypt_sha256$$2b$12$e5C3zfswn.CowOBbbb7ngeYbxKzJePCDHwo8AMr/SZeZCoGrk7oue

Using a defined algorithm and salt (not recommended, use it only for debug):

let encoded = make_password_with_settings("KRONOS", "seasalt", Algorithm::PBKDF2SHA1);
// Returns exactly this (remember, the salt is fixed!):
// pbkdf2_sha1$24000$seasalt$F+kiWNHXbMBcwgxsvSKFCWHnZZ0=

Warning: make_password_with_settings and make_password_core will both panic if salt is not only letters and numbers (^[A-Za-z0-9]*$).

Generating a Hashed Password based on a Django version

New in 0.2.1.

Django versions can have different number of iterations for hashers based on PBKDF2 and BCrypt algorithms; this abstraction makes possible to generate a password with the same number of iterations used in that versions.

use djangohashers::{Django, DjangoVersion};

let django = Django {version: DjangoVersion::V1_8};  // Django 1.8.
let encoded = django.make_password("KRONOS");
// Returns something like:
// pbkdf2_sha256$20000$u0C1E8jrnAYx$7KIo/fAuBJpswQyL7pTxO06ccrSjGdIe7iSqzdVub1w=
//               |||||
// ...notice the 20000 iterations, used in Django 1.8.

Available versions:

  • DjangoVersion::Current Current Django version (2.1 for DjangoHashers 0.3.2).
  • DjangoVersion::V1_4 Django 1.4
  • DjangoVersion::V1_5 Django 1.5
  • DjangoVersion::V1_6 Django 1.6
  • DjangoVersion::V1_7 Django 1.7
  • DjangoVersion::V1_8 Django 1.8
  • DjangoVersion::V1_9 Django 1.9
  • DjangoVersion::V1_10 Django 1.10
  • DjangoVersion::V1_11 Django 1.11
  • DjangoVersion::V2_0 Django 2.0
  • DjangoVersion::V2_1 Django 2.1
  • DjangoVersion::V2_2 Django 2.2

Verifying a Hash Format (pre-crypto)

Function signature:

pub fn is_password_usable(encoded: &str) -> bool {}

You can check if the password hash is properly formatted before running the expensive cryto stuff:

let encoded = "pbkdf2_sha256$24000$..."; // Fetched from DB.

if is_password_usable(encoded) {
    // Go ahead.
} else {
    // Check your database or report an issue.
}

Contributing

  • Be patient with me, I’m new to Rust and this is my first project.
  • Don't go nuts with your mad-rust-skillz, legibility is a priority.
  • Please use rustfmt in your code.
  • Always include some test case.

License

Rust DjangoHashers is released under the 3-Clause BSD License.

tl;dr: "free to use as long as you credit me".