ScryptElixir

Elixir wrapper for the Scrypt key derivation function. https://www.tarsnap.com/scrypt.html

Usage

This library provides raw scrypt hashing functionality as well as an implementation of the original suggested KDF.

• hash/6 is a lower level function that allows for a custom salt length and derived key length. The result is the raw binary scrypt hash. This function allows for custom salts and derived key lengths.
• kdf/4 is a function that creates an Scrypt header that utilizes HMAC to ensure hash integrity. This implementation enforces a 32 byte salt length and 64 byte derived key length.
• kdf/5 creates an Scrypt header, but allows for a custom 32 byte salt.
• verify?/6 validates an Scrypt hash using the supplied parameters, returning a boolean.
• verify_kdf?/2 validates an Scrypt header using the supplied password.

Both functions rely on a core set of parameters:

• password - the core binary being hashed
• salt - a pseudo-randomly generated string of bytes used for hashing
• logN - exponent for CPU/memory cost (2^logN)
• r - blocksize

Installation

The package can be installed by adding scrypt_elixir to your list of dependencies in mix.exs:

def deps do
  [
    {:scrypt_elixir, "~> 0.1.0"}
  ]
end

Documentation can be found at https://hexdocs.pm/scrypt_elixir.