AspnetPasswordHasher

An implementation of password hashing compatible with ASP.NET Identity PasswordHasher.

Installation

Add this line to your application's Gemfile:

gem 'aspnet_password_hasher'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install aspnet_password_hasher

Usage

Password hashing:

hasher = AspnetPasswordHasher::PasswordHasher.new
raw_password = 'my password'
hashed_password = hasher.hash_password(raw_password)

Verify password:

hasher = AspnetPasswordHasher::PasswordHasher.new
raw_password = 'my password'
hashed_password = hasher.hash_password(raw_password)
hasher.verify_hashed_password(hashed_password, raw_password) # => :success
hasher.verify_hashed_password(hashed_password, 'bad password') # => :failed

If a hashed string with a weaker algorithm is given, report it:

hasher = AspnetPasswordHasher::PasswordHasher.new
raw_password = 'my password'
hashed_password = hasher.hash_password(raw_password)

hasher_v2 = AspnetPasswordHasher::PasswordHasher.new(mode: :v2)
hasher_v2.verify_hashed_password(hashed_password, raw_password) # => :success_rehash_needed

hasher_fewer_iters = AspnetPasswordHasher::PasswordHasher.new(iter_count: 100)
hasher_fewer_iters.verify_hashed_password(hashed_password, raw_password) # => :success_rehash_needed

You can pass parameters similar to PasswordHasher:

# compatibility mode, version 2
hasher = AspnetPasswordHasher::PasswordHasher.new(mode: :v2)

# compatibility mode, version 3 (default)
hasher = AspnetPasswordHasher::PasswordHasher.new(mode: :v3)

# custom iteration count (default is 10000)
hasher = AspnetPasswordHasher::PasswordHasher.new(iter_count: 99999)

# custom random number generator (default is SecureRandom)
hasher = AspnetPasswordHasher::PasswordHasher.new(random_number_generator: Random.new)

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and the created tag, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/kzkn/aspnet_password_hasher.

License

The gem is available as open source under the terms of the MIT License.