# coding: utf-8
# PyGOST -- Pure Python GOST cryptographic functions library
# Copyright (C) 2015-2016 Sergey Matveev <stargrave@stargrave.org>
#
# This program 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 3 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

from unittest import TestCase

from pygost.gost28147_mac import MAC


class TestMAC(TestCase):
    """ Test vectors generated with libgcl3 library
    """
    k = b'This is message\xFF length\x0032 bytes'

    def test_a(self):
        self.assertEqual(
            MAC(self.k, b'a').hexdigest(),
            'bd5d3b5b2b7b57af',
        )

    def test_abc(self):
        self.assertEqual(
            MAC(self.k, b'abc').hexdigest(),
            '28661e40805b1ff9',
        )

    def test_128U(self):
        self.assertEqual(
            MAC(self.k, 128 * b'U').hexdigest(),
            '1a06d1bad74580ef',
        )

    def test_13x(self):
        self.assertEqual(
            MAC(self.k, 13 * b'x').hexdigest(),
            '917ee1f1a668fbd3',
        )

    def test_parts(self):
        m = MAC(self.k)
        m.update(b'foo')
        m.update(b'bar')
        self.assertEqual(m.digest(), MAC(self.k, b'foobar').digest())

    def test_copy(self):
        m = MAC(self.k, b'foo')
        c = m.copy()
        m.update(b'barbaz')
        c.update(b'bar')
        c.update(b'baz')
        self.assertEqual(m.digest(), c.digest())