text: # -----------------------------------------------------------------------------
  # The MIT License (MIT)
  # Copyright (c) 2018 Robbie Coenmans
  #
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the "Software"), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in all
  # copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  # SOFTWARE.
  # -----------------------------------------------------------------------------
  
  import argparse
  import OpenSSL
  
  def read_certificate(ca_cert):
      with open(ca_cert, mode='rb') as file:
          return OpenSSL.crypto.load_certificate(OpenSSL.crypto.FILETYPE_PEM, file.read())
  
  def read_private_key(ca_key, passphrase=None):
      with open(ca_key, mode='rb') as file:
          return OpenSSL.crypto.load_privatekey(OpenSSL.crypto.FILETYPE_PEM, file.read(), passphrase=passphrase)
  
  def export_to_pkcs12(filename, key, cert, passphrase=None):
      pkcs = OpenSSL.crypto.PKCS12()
      pkcs.set_privatekey(key)
      pkcs.set_certificate(cert)
      with open(filename, 'wb') as file:
          file.write(pkcs.export(passphrase=passphrase))
  
  if __name__ == '__main__':
      parser = argparse.ArgumentParser(description='pkcsutil converts a PEM formatted certificate/private key to PKCS12.')
      parser.add_argument('--key',  help='Private key filename, PEM encoded.')
      parser.add_argument('--cert', help='Certificate filename, PEM encoded.')
      parser.add_argument('--passphrase', help='Passphrase for the private key.', default='')
      parser.add_argument('--out',  help='Output filename (.pfx).')
  
      args = parser.parse_args()
      key_path   = args.key
      cert_path  = args.cert
      passphrase = args.passphrase
      out_path   = args.out
  
      if len(key_path) == 0 or len(cert_path) == 0 or len(out_path) == 0:
          parser.print_usage()
          exit(1)
  
      if len(passphrase) == 0:
          passphrase = None
      else:
          passphrase = passphrase.encode()
  
      key  = read_private_key(key_path, passphrase)
      cert = read_certificate(cert_path)
      export_to_pkcs12(out_path, key, cert, passphrase)
  