grantr

# A demonstration of the CurveCP handshake protocol. This protocol has many
# favorable security properties described at http://curvecp.org.
#
# In addition to its security advantages, it has the following favorable properties:
# * Needs only 2 messages (1 from client, 1 from server) before application
#   messages can be exchanged (3 before the server can send application messages)
# * Does not require the server to keep protocol state between handshake messages.
#
# An overview of the protocol:
#

tarcieri

# Experimenting with implementing semiprivate keys with RbNaCl

require 'rbnacl'
require 'hkdf'

module Semiprivate
  class WriteKey
    def initialize(seed)
      if seed.bytesize != 32
        raise ArgumentError, "seed must be 32 bytes"