pem-to-p12

#!/usr/bin/env ruby
# frozen_string_literal: true

# Copyright (c) 2011 The University of Manchester, UK.
#
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#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
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#  * Redistributions of source code must retain the above copyright notice,
#    this list of conditions and the following disclaimer.
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#  * Redistributions in binary form must reproduce the above copyright notice,
#    this list of conditions and the following disclaimer in the documentation
#    and/or other materials provided with the distribution.
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#  * Neither the names of The University of Manchester nor the names of its
#    contributors may be used to endorse or promote products derived from this
#    software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# Author: Robert Haines

require 'rubygems'
require 'openssl'
require 'optparse'
require 'io/console'

options = {}
opts = OptionParser.new do |opt|
  opt.banner = 'Usage: pem-to-p12 [options] pem-file'
  opt.separator '  Convert the supplied pem file into p12 format where ' \
    '[options] can be:'
  opt.on('-o FILENAME', '--out=FILENAME', 'The file in which to store the ' \
    'output. If this is not specified it will be written to the ' \
    'terminal.') do |val|
    options[:out] = val.chomp
  end
  opt.on('-p PASSWORD', '--password=PASSWORD', 'The export password for the ' \
    'p12 file. If not specified it will be asked for.') do |val|
    options[:password] = val.chomp
  end
  opt.on_tail('-h', '-?', '--help', 'Show this help message.') do
    puts opts
    exit
  end
  opt.on_tail('-v', '--version', 'Show the version.') do
    puts '2.0'
    exit
  end
end

opts.parse!

infile = ARGV.shift
if infile.nil?
  warn opts
  exit(1)
else
  data = File.read(infile.chomp)
end

password = options[:password]
if password.nil?
  p1 = $stdin.getpass('Enter Export Password:')
  p2 = $stdin.getpass('Verify Export Password:')

  if p1 == p2
    password = p1
  else
    warn 'Password mismatch'
    exit(1)
  end
end

cert = OpenSSL::X509::Certificate.new(data)
pkey = OpenSSL::PKey::RSA.new(data)
p12 = OpenSSL::PKCS12.create(password, 'Imported Certificate', pkey, cert)

if options[:out]
  File.open(options[:out], 'w') { |f| f.syswrite(p12.to_der) }
else
  puts p12.to_der
end