Jenkins hash digest

gistfile1.txt

class Digest::Jenkins

  MAX_32_BIT = 4294967295

  def self.digest(string)
    hash = 0

    string.each_byte do |byte|
      hash += byte
      hash &= MAX_32_BIT
      hash += ((hash << 10) & MAX_32_BIT)
      hash &= MAX_32_BIT
      hash ^= hash >> 6
    end

    hash += (hash << 3 & MAX_32_BIT)
    hash &= MAX_32_BIT
    hash ^= hash >> 11
    hash += (hash << 15 & MAX_32_BIT)
    hash &= MAX_32_BIT
    hash
  end
end