SSH key generation in ruby

simple_ssh_keygen_wrapper.rb

# This isnt meant to provide all options, just my simple wrapper for personal purposes

def generate_ssh_key
  type = 'rsa'
  bits = 4096
  comment = 'example@example.com'
  
  system("ssh-keygen -t #{type} -b #{bits} -C #{comment}")
end

# If you wanna specify an output file

def generate_ssh_key_with_file
  type = 'rsa'
  bits = 4096
  comment = 'example@example.com'
  output = '/home/user/example_user'
  
  system("ssh-keygen -t #{type} -b #{bits} -C #{comment} -f #{output}")
end

## All one method

def generate_ssh_key_with_file(output = nil)
  type = 'rsa'
  bits = 4096
  comment = 'example@example.com'
  
  output = " -f #{output}" if output
  
  system("ssh-keygen -t #{type} -b #{bits} -C #{comment}#{output}")
end

using_pure_ruby.rb

require 'openssl'                                                  
                                                                   
key = OpenSSL::PKey::RSA.new(4096)                                 
                                                                   
open('private_key.pem', 'w') { |io| io.write key.to_pem }          
open('public_key.pem', 'w') { |io| io.write key.public_key.to_pem }

#####################################################################
# Unfortunately, this only purely generates an RSA key              #
# Based on my findings, I could either load a libray like Net::SSH  #
# Or simply write a wrapped around ssh-keygen                       #
#####################################################################

# After looking @
# https://github.com/bensie/sshkey/blob/master/lib/sshkey.rb
# It appears to create a pure ruby implementation is a little much