module Roda::RodaPlugins::Sessions

def self.split_secret(name, secret)

Split given secret into a cipher secret and an hmac secret. 
def self.split_secret(name, secret)
  raise RodaError, "sessions plugin :#{name} option must be a String" unless secret.is_a?(String)
  raise RodaError, "invalid sessions plugin :#{name} option length: #{secret.bytesize}, must be >=64" unless secret.bytesize >= 64
  hmac_secret = secret = secret.dup.force_encoding('BINARY')
  cipher_secret = secret.slice!(0, 32)
  [cipher_secret.freeze, hmac_secret.freeze]
end