# 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 binascii

import pytest

from cryptography.hazmat.backends.interfaces import HMACBackend
from cryptography.hazmat.primitives import hashes, hmac

from .utils import generate_hmac_test
from ...utils import load_hash_vectors


@pytest.mark.supported(
    only_if=lambda backend: backend.hmac_supported(hashes.MD5()),
    skip_message="Does not support MD5",
)
@pytest.mark.requires_backend_interface(interface=HMACBackend)
class TestHMACMD5(object):
    test_hmac_md5 = generate_hmac_test(
        load_hash_vectors,
        "HMAC",
        [
            "rfc-2202-md5.txt",
        ],
        hashes.MD5(),
    )


@pytest.mark.supported(
    only_if=lambda backend: backend.hmac_supported(hashes.SHA1()),
    skip_message="Does not support SHA1",
)
@pytest.mark.requires_backend_interface(interface=HMACBackend)
class TestHMACSHA1(object):
    test_hmac_sha1 = generate_hmac_test(
        load_hash_vectors,
        "HMAC",
        [
            "rfc-2202-sha1.txt",
        ],
        hashes.SHA1(),
    )


@pytest.mark.supported(
    only_if=lambda backend: backend.hmac_supported(hashes.SHA224()),
    skip_message="Does not support SHA224",
)
@pytest.mark.requires_backend_interface(interface=HMACBackend)
class TestHMACSHA224(object):
    test_hmac_sha224 = generate_hmac_test(
        load_hash_vectors,
        "HMAC",
        [
            "rfc-4231-sha224.txt",
        ],
        hashes.SHA224(),
    )


@pytest.mark.supported(
    only_if=lambda backend: backend.hmac_supported(hashes.SHA256()),
    skip_message="Does not support SHA256",
)
@pytest.mark.requires_backend_interface(interface=HMACBackend)
class TestHMACSHA256(object):
    test_hmac_sha256 = generate_hmac_test(
        load_hash_vectors,
        "HMAC",
        [
            "rfc-4231-sha256.txt",
        ],
        hashes.SHA256(),
    )


@pytest.mark.supported(
    only_if=lambda backend: backend.hmac_supported(hashes.SHA384()),
    skip_message="Does not support SHA384",
)
@pytest.mark.requires_backend_interface(interface=HMACBackend)
class TestHMACSHA384(object):
    test_hmac_sha384 = generate_hmac_test(
        load_hash_vectors,
        "HMAC",
        [
            "rfc-4231-sha384.txt",
        ],
        hashes.SHA384(),
    )


@pytest.mark.supported(
    only_if=lambda backend: backend.hmac_supported(hashes.SHA512()),
    skip_message="Does not support SHA512",
)
@pytest.mark.requires_backend_interface(interface=HMACBackend)
class TestHMACSHA512(object):
    test_hmac_sha512 = generate_hmac_test(
        load_hash_vectors,
        "HMAC",
        [
            "rfc-4231-sha512.txt",
        ],
        hashes.SHA512(),
    )


@pytest.mark.supported(
    only_if=lambda backend: backend.hmac_supported(hashes.BLAKE2b(
        digest_size=64
    )),
    skip_message="Does not support BLAKE2",
)
@pytest.mark.requires_backend_interface(interface=HMACBackend)
class TestHMACBLAKE2(object):
    def test_blake2b(self, backend):
        h = hmac.HMAC(b"0" * 64, hashes.BLAKE2b(digest_size=64), backend)
        h.update(b"test")
        digest = h.finalize()
        assert digest == binascii.unhexlify(
            b"b5319122f8a24ba134a0c9851922448104e25be5d1b91265c0c68b22722f0f29"
            b"87dba4aeaa69e6bed7edc44f48d6b1be493a3ce583f9c737c53d6bacc09e2f32"
        )

    def test_blake2s(self, backend):
        h = hmac.HMAC(b"0" * 32, hashes.BLAKE2s(digest_size=32), backend)
        h.update(b"test")
        digest = h.finalize()
        assert digest == binascii.unhexlify(
            b"51477cc5bdf1faf952cf97bb934ee936de1f4d5d7448a84eeb6f98d23b392166"
        )