# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.

from __future__ import absolute_import, division, print_function

import pytest

import six

from cryptography.exceptions import AlreadyFinalized
from cryptography.hazmat.primitives import padding


class TestPKCS7(object):
    @pytest.mark.parametrize("size", [127, 4096, -2])
    def test_invalid_block_size(self, size):
        with pytest.raises(ValueError):
            padding.PKCS7(size)

    @pytest.mark.parametrize(
        ("size", "padded"),
        [
            (128, b"1111"),
            (128, b"1111111111111111"),
            (128, b"111111111111111\x06"),
            (128, b""),
            (128, b"\x06" * 6),
            (128, b"\x00" * 16),
        ],
    )
    def test_invalid_padding(self, size, padded):
        unpadder = padding.PKCS7(size).unpadder()
        with pytest.raises(ValueError):
            unpadder.update(padded)
            unpadder.finalize()

    def test_non_bytes(self):
        padder = padding.PKCS7(128).padder()
        with pytest.raises(TypeError):
            padder.update(u"abc")
        unpadder = padding.PKCS7(128).unpadder()
        with pytest.raises(TypeError):
            unpadder.update(u"abc")

    def test_zany_py2_bytes_subclass(self):
        class mybytes(bytes):  # noqa: N801
            def __str__(self):
                return "broken"

        str(mybytes())
        padder = padding.PKCS7(128).padder()
        padder.update(mybytes(b"abc"))
        unpadder = padding.PKCS7(128).unpadder()
        unpadder.update(mybytes(padder.finalize()))
        assert unpadder.finalize() == b"abc"

    @pytest.mark.parametrize(
        ("size", "unpadded", "padded"),
        [
            (128, b"1111111111", b"1111111111\x06\x06\x06\x06\x06\x06"),
            (
                128,
                b"111111111111111122222222222222",
                b"111111111111111122222222222222\x02\x02",
            ),
            (128, b"1" * 16, b"1" * 16 + b"\x10" * 16),
            (128, b"1" * 17, b"1" * 17 + b"\x0F" * 15),
        ],
    )
    def test_pad(self, size, unpadded, padded):
        padder = padding.PKCS7(size).padder()
        result = padder.update(unpadded)
        result += padder.finalize()
        assert result == padded

    @pytest.mark.parametrize(
        ("size", "unpadded", "padded"),
        [
            (128, b"1111111111", b"1111111111\x06\x06\x06\x06\x06\x06"),
            (
                128,
                b"111111111111111122222222222222",
                b"111111111111111122222222222222\x02\x02",
            ),
        ],
    )
    def test_unpad(self, size, unpadded, padded):
        unpadder = padding.PKCS7(size).unpadder()
        result = unpadder.update(padded)
        result += unpadder.finalize()
        assert result == unpadded

    def test_use_after_finalize(self):
        padder = padding.PKCS7(128).padder()
        b = padder.finalize()
        with pytest.raises(AlreadyFinalized):
            padder.update(b"")
        with pytest.raises(AlreadyFinalized):
            padder.finalize()

        unpadder = padding.PKCS7(128).unpadder()
        unpadder.update(b)
        unpadder.finalize()
        with pytest.raises(AlreadyFinalized):
            unpadder.update(b"")
        with pytest.raises(AlreadyFinalized):
            unpadder.finalize()

    def test_large_padding(self):
        padder = padding.PKCS7(2040).padder()
        padded_data = padder.update(b"")
        padded_data += padder.finalize()

        for i in six.iterbytes(padded_data):
            assert i == 255

        unpadder = padding.PKCS7(2040).unpadder()
        data = unpadder.update(padded_data)
        data += unpadder.finalize()

        assert data == b""

    def test_bytearray(self):
        padder = padding.PKCS7(128).padder()
        unpadded = bytearray(b"t" * 38)
        padded = (
            padder.update(unpadded)
            + padder.update(unpadded)
            + padder.finalize()
        )
        unpadder = padding.PKCS7(128).unpadder()
        final = unpadder.update(padded) + unpadder.finalize()
        assert final == unpadded + unpadded


class TestANSIX923(object):
    @pytest.mark.parametrize("size", [127, 4096, -2])
    def test_invalid_block_size(self, size):
        with pytest.raises(ValueError):
            padding.ANSIX923(size)

    @pytest.mark.parametrize(
        ("size", "padded"),
        [
            (128, b"1111"),
            (128, b"1111111111111111"),
            (128, b"111111111111111\x06"),
            (128, b"1111111111\x06\x06\x06\x06\x06\x06"),
            (128, b""),
            (128, b"\x06" * 6),
            (128, b"\x00" * 16),
        ],
    )
    def test_invalid_padding(self, size, padded):
        unpadder = padding.ANSIX923(size).unpadder()
        with pytest.raises(ValueError):
            unpadder.update(padded)
            unpadder.finalize()

    def test_non_bytes(self):
        padder = padding.ANSIX923(128).padder()
        with pytest.raises(TypeError):
            padder.update(u"abc")
        unpadder = padding.ANSIX923(128).unpadder()
        with pytest.raises(TypeError):
            unpadder.update(u"abc")

    def test_zany_py2_bytes_subclass(self):
        class mybytes(bytes):  # noqa: N801
            def __str__(self):
                return "broken"

        str(mybytes())
        padder = padding.ANSIX923(128).padder()
        padder.update(mybytes(b"abc"))
        unpadder = padding.ANSIX923(128).unpadder()
        unpadder.update(mybytes(padder.finalize()))
        assert unpadder.finalize() == b"abc"

    @pytest.mark.parametrize(
        ("size", "unpadded", "padded"),
        [
            (128, b"1111111111", b"1111111111\x00\x00\x00\x00\x00\x06"),
            (
                128,
                b"111111111111111122222222222222",
                b"111111111111111122222222222222\x00\x02",
            ),
            (128, b"1" * 16, b"1" * 16 + b"\x00" * 15 + b"\x10"),
            (128, b"1" * 17, b"1" * 17 + b"\x00" * 14 + b"\x0F"),
        ],
    )
    def test_pad(self, size, unpadded, padded):
        padder = padding.ANSIX923(size).padder()
        result = padder.update(unpadded)
        result += padder.finalize()
        assert result == padded

    @pytest.mark.parametrize(
        ("size", "unpadded", "padded"),
        [
            (128, b"1111111111", b"1111111111\x00\x00\x00\x00\x00\x06"),
            (
                128,
                b"111111111111111122222222222222",
                b"111111111111111122222222222222\x00\x02",
            ),
        ],
    )
    def test_unpad(self, size, unpadded, padded):
        unpadder = padding.ANSIX923(size).unpadder()
        result = unpadder.update(padded)
        result += unpadder.finalize()
        assert result == unpadded

    def test_use_after_finalize(self):
        padder = padding.ANSIX923(128).padder()
        b = padder.finalize()
        with pytest.raises(AlreadyFinalized):
            padder.update(b"")
        with pytest.raises(AlreadyFinalized):
            padder.finalize()

        unpadder = padding.ANSIX923(128).unpadder()
        unpadder.update(b)
        unpadder.finalize()
        with pytest.raises(AlreadyFinalized):
            unpadder.update(b"")
        with pytest.raises(AlreadyFinalized):
            unpadder.finalize()

    def test_bytearray(self):
        padder = padding.ANSIX923(128).padder()
        unpadded = bytearray(b"t" * 38)
        padded = (
            padder.update(unpadded)
            + padder.update(unpadded)
            + padder.finalize()
        )
        unpadder = padding.ANSIX923(128).unpadder()
        final = unpadder.update(padded) + unpadder.finalize()
        assert final == unpadded + unpadded