#!/usr/bin/env python

# Copyright (C) 2016 g10 Code GmbH

#

# This file is part of GPGME.

#

# GPGME is free software; you can redistribute it and/or modify it

# under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# GPGME is distributed in the hope that it will be useful, but WITHOUT

# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY

# or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General

# Public License for more details.

#

# You should have received a copy of the GNU Lesser General Public

# License along with this program; if not, see <http://www.gnu.org/licenses/>.

from __future__ import absolute_import, print_function, unicode_literals

del absolute_import, print_function, unicode_literals

import sys

import random

import gpg

import support

if len(sys.argv) == 2:

    nbytes = int(sys.argv[1])

else:

    nbytes = 100000

c = gpg.Context()

ntoread = nbytes

def read_cb(amount):

    global ntoread

    chunk = ntoread if ntoread < amount else amount

    ntoread -= chunk

    assert ntoread >= 0

    assert chunk >= 0

    return bytes(bytearray(random.randrange(256) for i in range(chunk)))

nwritten = 0

def write_cb(data):

    global nwritten

    nwritten += len(data)

    return len(data)

source = gpg.Data(cbs=(read_cb, None, None, lambda: None))

sink = gpg.Data(cbs=(None, write_cb, None, lambda: None))

keys = []

keys.append(c.get_key("A0FF4590BB6122EDEF6E3C542D727CC768697734", False))

keys.append(c.get_key("D695676BDCEDCC2CDD6152BCFE180B1DA9E3B0B2", False))

c.op_encrypt(keys, gpg.constants.ENCRYPT_ALWAYS_TRUST, source, sink)

result = c.op_encrypt_result()

assert not result.invalid_recipients, \

    "Invalid recipient encountered: {}".format(result.invalid_recipients.fpr)

assert ntoread == 0

if support.verbose:

    sys.stderr.write(

        "plaintext={} bytes, ciphertext={} bytes\n".format(nbytes, nwritten))