module Bundler::Random::Formatter

def hex(n=nil)

prng.hex #=> "91dc3bfb4de5b11d029d376634589b61"
prng = Random.new
# or
Random.hex #=> "eb693ec8252cd630102fd0d0fb7c3485"

require 'bundler/vendor/securerandom/lib/random/formatter'

The result may contain 0-9 and a-f.

It may be larger in the future.
If _n_ is not specified or is nil, 16 is assumed.

The length of the resulting hexadecimal string is twice of _n_.
The argument _n_ specifies the length, in bytes, of the random number to be generated.

Generate a random hexadecimal string. 
def hex(n=nil)
  random_bytes(n).unpack1("H*")
end