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# frozen_string_literal: true
module Spec
module Support
module Helpers
class KeyGeneratorHelper
# The components in a openssh .pub / known_host RSA public key.
RSA_COMPONENTS = ['ssh-rsa', :e, :n].freeze
attr_reader :size
def initialize(size = 2048)
@size = size
end
def generate
key = OpenSSL::PKey::RSA.generate(size)
components = RSA_COMPONENTS.map do |component|
key.respond_to?(component) ? encode_mpi(key.public_send(component)) : component
end
# Ruby tries to be helpful and adds new lines every 60 bytes :(
'ssh-rsa ' + [pack_pubkey_components(components)].pack('m').delete("\n")
end
private
# Encodes an openssh-mpi-encoded integer.
def encode_mpi(n) # rubocop:disable Naming/UncommunicativeMethodParamName
chars = []
n = n.to_i
chars << (n & 0xff) && n >>= 8 while n != 0
chars << 0 if chars.empty? || chars.last >= 0x80
chars.reverse.pack('C*')
end
# Packs string components into an openssh-encoded pubkey.
def pack_pubkey_components(strings)
(strings.flat_map { |s| [s.length].pack('N') }).zip(strings).join
end
end
end
end
end
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