# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.


from __future__ import absolute_import, division, print_function

import os

import pytest

from cryptography.hazmat.primitives.asymmetric import rsa

from ...utils import load_pkcs1_vectors, load_vectors_from_file


class TestRSA(object):
    @pytest.mark.parametrize(
        "pkcs1_example",
        load_vectors_from_file(
            os.path.join(
                "asymmetric", "RSA", "pkcs-1v2-1d2-vec", "pss-vect.txt"),
            load_pkcs1_vectors
        )
    )
    def test_load_pss_vect_example_keys(self, pkcs1_example):
        secret, public = pkcs1_example

        skey = rsa.RSAPrivateKey(**secret)
        pkey = rsa.RSAPublicKey(**public)
        pkey2 = skey.public_key()

        assert skey and pkey and pkey2

        assert skey.modulus
        assert skey.modulus == pkey.modulus
        assert skey.modulus == skey.n
        assert skey.public_exponent == pkey.public_exponent
        assert skey.public_exponent == skey.e
        assert skey.private_exponent == skey.d

        assert pkey.modulus
        assert pkey.modulus == pkey2.modulus
        assert pkey.modulus == pkey.n
        assert pkey.public_exponent == pkey2.public_exponent
        assert pkey.public_exponent == pkey.e

        assert skey.key_size
        assert skey.key_size == pkey.key_size
        assert skey.key_size == pkey2.key_size

        assert skey.p * skey.q == skey.modulus

    def test_invalid_private_key_argument_types(self):
        with pytest.raises(TypeError):
            rsa.RSAPrivateKey(None, None, None, None, None)

    def test_invalid_public_key_argument_types(self):
        with pytest.raises(TypeError):
            rsa.RSAPublicKey(None, None)

    def test_invalid_private_key_argument_values(self):
        # Start with p=3, q=5, private_exponent=14, public_exponent=7,
        # modulus=15. Then change one value at a time to test the bounds.

        # Test a modulus < 3.
        with pytest.raises(ValueError):
            rsa.RSAPrivateKey(
                p=3,
                q=5,
                private_exponent=14,
                public_exponent=7,
                modulus=2
            )

        # Test a modulus != p * q.
        with pytest.raises(ValueError):
            rsa.RSAPrivateKey(
                p=3,
                q=5,
                private_exponent=14,
                public_exponent=7,
                modulus=16
            )

        # Test a p > modulus.
        with pytest.raises(ValueError):
            rsa.RSAPrivateKey(
                p=16,
                q=5,
                private_exponent=14,
                public_exponent=7,
                modulus=15
            )

        # Test a q > modulus.
        with pytest.raises(ValueError):
            rsa.RSAPrivateKey(
                p=3,
                q=16,
                private_exponent=14,
                public_exponent=7,
                modulus=15
            )

        # Test a private_exponent > modulus
        with pytest.raises(ValueError):
            rsa.RSAPrivateKey(
                p=3,
                q=5,
                private_exponent=16,
                public_exponent=7,
                modulus=15
            )

        # Test a public_exponent < 3
        with pytest.raises(ValueError):
            rsa.RSAPrivateKey(
                p=3,
                q=5,
                private_exponent=14,
                public_exponent=1,
                modulus=15
            )

        # Test a public_exponent > modulus
        with pytest.raises(ValueError):
            rsa.RSAPrivateKey(
                p=3,
                q=5,
                private_exponent=14,
                public_exponent=17,
                modulus=15
            )

        # Test a public_exponent that is not odd.
        with pytest.raises(ValueError):
            rsa.RSAPrivateKey(
                p=3,
                q=5,
                private_exponent=14,
                public_exponent=6,
                modulus=15
            )

    def test_invalid_public_key_argument_values(self):
        # Start with public_exponent=7, modulus=15. Then change one value at a
        # time to test the bounds.

        # Test a modulus < 3.
        with pytest.raises(ValueError):
            rsa.RSAPublicKey(public_exponent=7, modulus=2)

        # Test a public_exponent < 3
        with pytest.raises(ValueError):
            rsa.RSAPublicKey(public_exponent=1, modulus=15)

        # Test a public_exponent > modulus
        with pytest.raises(ValueError):
            rsa.RSAPublicKey(public_exponent=17, modulus=15)

        # Test a public_exponent that is not odd.
        with pytest.raises(ValueError):
            rsa.RSAPublicKey(public_exponent=6, modulus=15)