Example Auth Lib

auth.rb

#
# Simple Authentication library
#
require 'digest'
require 'securerandom'

class Auth

  def initialize(opts)
    @salt_length=opts[:salt_length] || 32
  end

  def self.gen_salt()
    return SecureRandom.hex(@salt_length) 
  end

  def self.gen_hash(salt,shake)
    return "sha256$#{salt}$" + Digest::SHA256.hexdigest(salt+shake)
  end

  def self.get_salt(hash)
    salt = hash.split('$')[1]
    return salt
  end

  def self.get_algo(hash)
    algo = hash.split('$')[0]
    return algo
  end

  def self.get_hash(hash)
    hash = hash.split('$')[3]
    return hash
  end

  def self.hash_ok?(dbhash,shake)
    algo =self.get_algo(dbhash)
    salt = self.get_salt(dbhash)

    newhash = self.gen_hash(salt,shake)
    if newhash == dbhash
      return true
    else
      return false
    end

  end

end