HexPrefix

Elixir implementation of Ethereum’s Hex Prefix encoding

The encoding’s specification can be found in the yellow paper or in the ethereum wiki under Appendix C.

Installation

The easiest way to add HexPrefix to your project is by using Mix.

Add :hex_prefix as a dependency to your project’s mix.exs:

defp deps do
  [
    {:hex_prefix, "~> 0.1.0"}
  ]
end

And run:

$ mix deps.get

Basic Usage

Use HexPrefix.encode/1 to encode a list of nibbles using hex-prefix notation.

  ## Examples

    iex> HexPrefix.encode({[0xa, 0xb, 0xc, 0xd], false})
    <<0, 171, 205>>

    iex> HexPrefix.encode({[0xa, 0xb, 0xc, 0xd], true})
    <<32, 171, 205>>

    iex> HexPrefix.encode({[0x09, 0xa, 0xb, 0xc, 0xd], false})
    <<25, 171, 205>>

Use HexPrefix.decode/1 to decode a binary encoded via hex-prefix notation.

  ## Examples

    iex> HexPrefix.decode(<<0, 171, 205>>)
    {[0xa, 0xb, 0xc, 0xd], false}

    iex> HexPrefix.decode(<<32, 171, 205>>)
    {[0xa, 0xb, 0xc, 0xd], true}

    iex> HexPrefix.decode(<<25, 171, 205>>)
    {[0x09, 0xa, 0xb, 0xc, 0xd], false}

Contributing

1. Fork it!
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request

Author

Geoffrey Hayes (@hayesgm)

License

HexPrefix is released under the MIT License. See the LICENSE file for further details.