crypted-pubkey-encrypt

#!/usr/bin/env ruby
require 'openssl'
require 'base64'

message = ARGV[0]
keyloc = "#{File.dirname(__FILE__)}/keys/#{ARGV[1]}"
keysize = ARGV[2].to_i if ARGV[2]

if File.exists? keyloc
  pubkey = OpenSSL::PKey::RSA.new File.read "#{keyloc}.pub"
else
  key = OpenSSL::PKey::RSA.new keysize
  File.open keyloc, 'w' do |f|
    f.write key.to_pem(OpenSSL::Cipher::AES128.new(:CBC), ARGV[3])
  end
  File.open "#{keyloc}.pub", 'w' do |f|
    f.write key.public_key.to_pem
  end
  pubkey = key.public_key
end

ciphertext = pubkey.public_encrypt message

puts "Ciphertext: #{Base64.strict_encode64 ciphertext}"