# SPDX-FileCopyrightText: 2015 Legrandin <helderijs@gmail.com>
# SPDX-License-Identifier: BSD-2-Clause

from binascii import unhexlify

import pytest

from Crypto.Cipher import AES, ARC2, CAST, DES, DES3, Blowfish
from Crypto.Hash import SHAKE128
from Crypto.SelfTest.loader import load_test_vectors_wycheproof, wycheproof_id
from Crypto.SelfTest.st_common import wycheproof_warnings
from Crypto.Util._bytes import tobytes
from Crypto.Util.strxor import strxor


def get_tag_random(tag, length):
    return SHAKE128.new(data=tobytes(tag)).read(length)


class TestEax:
    key_128 = get_tag_random("key_128", 16)
    key_192 = get_tag_random("key_192", 16)
    nonce_96 = get_tag_random("nonce_128", 12)
    data_128 = get_tag_random("data_128", 16)

    def test_loopback_128(self):
        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        pt = get_tag_random("plaintext", 16 * 100)
        ct = cipher.encrypt(pt)

        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        pt2 = cipher.decrypt(ct)
        assert pt == pt2

    def test_loopback_64(self):
        cipher = DES3.new(self.key_192, DES3.MODE_EAX, nonce=self.nonce_96)
        pt = get_tag_random("plaintext", 8 * 100)
        ct = cipher.encrypt(pt)

        cipher = DES3.new(self.key_192, DES3.MODE_EAX, nonce=self.nonce_96)
        pt2 = cipher.decrypt(ct)
        assert pt == pt2

    def test_nonce(self):
        # If not passed, the nonce is created randomly
        cipher = AES.new(self.key_128, AES.MODE_EAX)
        nonce1 = cipher.nonce
        cipher = AES.new(self.key_128, AES.MODE_EAX)
        nonce2 = cipher.nonce
        assert len(nonce1) == 16
        assert nonce1 != nonce2

        cipher = AES.new(self.key_128, AES.MODE_EAX, self.nonce_96)
        ct = cipher.encrypt(self.data_128)

        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        assert ct == cipher.encrypt(self.data_128)

    def test_nonce_must_be_bytes(self):
        with pytest.raises(TypeError):
            AES.new(self.key_128, AES.MODE_EAX, nonce="test12345678")

    def test_nonce_length(self):
        # nonce can be of any length (but not empty)
        with pytest.raises(ValueError):
            AES.new(self.key_128, AES.MODE_EAX, nonce=b"")

        for x in range(1, 128):
            cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=bytes([1]) * x)
            cipher.encrypt(bytes([1]))

    def test_block_size_128(self):
        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        assert cipher.block_size == AES.block_size

    def test_block_size_64(self):
        cipher = DES3.new(self.key_192, AES.MODE_EAX, nonce=self.nonce_96)
        assert cipher.block_size == DES3.block_size

    def test_nonce_attribute(self):
        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        assert cipher.nonce == self.nonce_96

        # By default, a 16 bytes long nonce is randomly generated
        nonce1 = AES.new(self.key_128, AES.MODE_EAX).nonce
        nonce2 = AES.new(self.key_128, AES.MODE_EAX).nonce
        assert len(nonce1) == 16
        assert nonce1 != nonce2

    def test_unknown_parameters(self):
        with pytest.raises(TypeError):
            AES.new(self.key_128, AES.MODE_EAX, self.nonce_96, 7)
        with pytest.raises(TypeError):
            AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96, unknown=7)

        # But some are only known by the base cipher
        # (e.g. use_aesni consumed by the AES module)
        AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96, use_aesni=False)

    def test_null_encryption_decryption(self):
        for func in "encrypt", "decrypt":
            cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
            result = getattr(cipher, func)(b"")
            assert result == b""

    def test_either_encrypt_or_decrypt(self):
        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        cipher.encrypt(b"")
        with pytest.raises(TypeError):
            cipher.decrypt(b"")

        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        cipher.decrypt(b"")
        with pytest.raises(TypeError):
            cipher.encrypt(b"")

    def test_data_must_be_bytes(self):
        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        with pytest.raises(TypeError):
            cipher.encrypt("test1234567890-*")

        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        with pytest.raises(TypeError):
            cipher.decrypt("test1234567890-*")

    def test_mac_len(self):
        # Invalid MAC length
        with pytest.raises(ValueError):
            AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96, mac_len=2 - 1)
        with pytest.raises(ValueError):
            AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96, mac_len=16 + 1)

        # Valid MAC length
        for mac_len in range(2, 16 + 1):
            cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96, mac_len=mac_len)
            _, mac = cipher.encrypt_and_digest(self.data_128)
            assert len(mac) == mac_len

        # Default MAC length
        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        _, mac = cipher.encrypt_and_digest(self.data_128)
        assert len(mac) == 16

    def test_invalid_mac(self):
        from Crypto.Util.strxor import strxor_c

        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        ct, mac = cipher.encrypt_and_digest(self.data_128)

        invalid_mac = strxor_c(mac, 0x01)

        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        with pytest.raises(ValueError):
            cipher.decrypt_and_verify(ct, invalid_mac)

    def test_hex_mac(self):
        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        mac_hex = cipher.hexdigest()
        assert cipher.digest() == unhexlify(mac_hex)

        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        cipher.hexverify(mac_hex)

    def test_message_chunks(self):
        # Validate that both associated data and plaintext/ciphertext
        # can be broken up in chunks of arbitrary length

        auth_data = get_tag_random("authenticated data", 127)
        plaintext = get_tag_random("plaintext", 127)

        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        cipher.update(auth_data)
        ciphertext, ref_mac = cipher.encrypt_and_digest(plaintext)

        def break_up(data, chunk_length):
            return [data[i : i + chunk_length] for i in range(0, len(data), chunk_length)]

        # Encryption
        for chunk_length in 1, 2, 3, 7, 10, 13, 16, 40, 80, 128:
            cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)

            for chunk in break_up(auth_data, chunk_length):
                cipher.update(chunk)
            pt2 = b""
            for chunk in break_up(ciphertext, chunk_length):
                pt2 += cipher.decrypt(chunk)
            assert plaintext == pt2
            cipher.verify(ref_mac)

        # Decryption
        for chunk_length in 1, 2, 3, 7, 10, 13, 16, 40, 80, 128:
            cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)

            for chunk in break_up(auth_data, chunk_length):
                cipher.update(chunk)
            ct2 = b""
            for chunk in break_up(plaintext, chunk_length):
                ct2 += cipher.encrypt(chunk)
            assert ciphertext == ct2
            assert cipher.digest() == ref_mac

    def test_bytearray(self):
        # Encrypt
        key_ba = bytearray(self.key_128)
        nonce_ba = bytearray(self.nonce_96)
        header_ba = bytearray(self.data_128)
        data_ba = bytearray(self.data_128)

        cipher1 = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        cipher1.update(self.data_128)
        ct = cipher1.encrypt(self.data_128)
        tag = cipher1.digest()

        cipher2 = AES.new(key_ba, AES.MODE_EAX, nonce=nonce_ba)
        key_ba[:3] = b"\xff\xff\xff"
        nonce_ba[:3] = b"\xff\xff\xff"
        cipher2.update(header_ba)
        header_ba[:3] = b"\xff\xff\xff"
        ct_test = cipher2.encrypt(data_ba)
        data_ba[:3] = b"\x99\x99\x99"
        tag_test = cipher2.digest()

        assert ct == ct_test
        assert tag == tag_test
        assert cipher1.nonce == cipher2.nonce

        # Decrypt
        key_ba = bytearray(self.key_128)
        nonce_ba = bytearray(self.nonce_96)
        header_ba = bytearray(self.data_128)
        ct_ba = bytearray(ct)
        tag_ba = bytearray(tag)
        del data_ba

        cipher3 = AES.new(key_ba, AES.MODE_EAX, nonce=nonce_ba)
        key_ba[:3] = b"\xff\xff\xff"
        nonce_ba[:3] = b"\xff\xff\xff"
        cipher3.update(header_ba)
        header_ba[:3] = b"\xff\xff\xff"
        pt_test = cipher3.decrypt(ct_ba)
        ct_ba[:3] = b"\xff\xff\xff"
        cipher3.verify(tag_ba)

        assert pt_test == self.data_128

    def test_memoryview(self):
        # Encrypt
        key_mv = memoryview(bytearray(self.key_128))
        nonce_mv = memoryview(bytearray(self.nonce_96))
        header_mv = memoryview(bytearray(self.data_128))
        data_mv = memoryview(bytearray(self.data_128))

        cipher1 = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        cipher1.update(self.data_128)
        ct = cipher1.encrypt(self.data_128)
        tag = cipher1.digest()

        cipher2 = AES.new(key_mv, AES.MODE_EAX, nonce=nonce_mv)
        key_mv[:3] = b"\xff\xff\xff"
        nonce_mv[:3] = b"\xff\xff\xff"
        cipher2.update(header_mv)
        header_mv[:3] = b"\xff\xff\xff"
        ct_test = cipher2.encrypt(data_mv)
        data_mv[:3] = b"\x99\x99\x99"
        tag_test = cipher2.digest()

        assert ct == ct_test
        assert tag == tag_test
        assert cipher1.nonce == cipher2.nonce

        # Decrypt
        key_mv = memoryview(bytearray(self.key_128))
        nonce_mv = memoryview(bytearray(self.nonce_96))
        header_mv = memoryview(bytearray(self.data_128))
        ct_mv = memoryview(bytearray(ct))
        tag_mv = memoryview(bytearray(tag))
        del data_mv

        cipher3 = AES.new(key_mv, AES.MODE_EAX, nonce=nonce_mv)
        key_mv[:3] = b"\xff\xff\xff"
        nonce_mv[:3] = b"\xff\xff\xff"
        cipher3.update(header_mv)
        header_mv[:3] = b"\xff\xff\xff"
        pt_test = cipher3.decrypt(ct_mv)
        ct_mv[:3] = b"\x99\x99\x99"
        cipher3.verify(tag_mv)

        assert pt_test == self.data_128

    def test_output_param(self):
        pt = b"5" * 128
        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        ct = cipher.encrypt(pt)
        tag = cipher.digest()

        output = bytearray(128)
        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        res = cipher.encrypt(pt, output=output)
        assert ct == output
        assert res is None

        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        res = cipher.decrypt(ct, output=output)
        assert pt == output
        assert res is None

        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        res, tag_out = cipher.encrypt_and_digest(pt, output=output)
        assert ct == output
        assert res is None
        assert tag == tag_out

        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        res = cipher.decrypt_and_verify(ct, tag, output=output)
        assert pt == output
        assert res is None

    def test_output_param_memoryview(self):
        pt = b"5" * 128
        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        ct = cipher.encrypt(pt)

        output = memoryview(bytearray(128))
        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        cipher.encrypt(pt, output=output)
        assert ct == output

        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        cipher.decrypt(ct, output=output)
        assert pt == output

    def test_output_param_neg(self):
        LEN_PT = 16

        pt = b"5" * LEN_PT
        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        ct = cipher.encrypt(pt)

        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        with pytest.raises(TypeError):
            cipher.encrypt(pt, output=b"0" * LEN_PT)

        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        with pytest.raises(TypeError):
            cipher.decrypt(ct, output=b"0" * LEN_PT)

        shorter_output = bytearray(LEN_PT - 1)
        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        with pytest.raises(ValueError):
            cipher.encrypt(pt, output=shorter_output)
        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        with pytest.raises(ValueError):
            cipher.decrypt(ct, output=shorter_output)


class TestEaxFSM:
    key_128 = get_tag_random("key_128", 16)
    nonce_96 = get_tag_random("nonce_128", 12)
    data_128 = get_tag_random("data_128", 16)

    def test_valid_init_encrypt_decrypt_digest_verify(self):
        # No authenticated data, fixed plaintext
        # Verify path INIT->ENCRYPT->DIGEST
        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        ct = cipher.encrypt(self.data_128)
        mac = cipher.digest()

        # Verify path INIT->DECRYPT->VERIFY
        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        cipher.decrypt(ct)
        cipher.verify(mac)

    def test_valid_init_update_digest_verify(self):
        # No plaintext, fixed authenticated data
        # Verify path INIT->UPDATE->DIGEST
        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        cipher.update(self.data_128)
        mac = cipher.digest()

        # Verify path INIT->UPDATE->VERIFY
        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        cipher.update(self.data_128)
        cipher.verify(mac)

    def test_valid_full_path(self):
        # Fixed authenticated data, fixed plaintext
        # Verify path INIT->UPDATE->ENCRYPT->DIGEST
        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        cipher.update(self.data_128)
        ct = cipher.encrypt(self.data_128)
        mac = cipher.digest()

        # Verify path INIT->UPDATE->DECRYPT->VERIFY
        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        cipher.update(self.data_128)
        cipher.decrypt(ct)
        cipher.verify(mac)

    def test_valid_init_digest(self):
        # Verify path INIT->DIGEST
        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        cipher.digest()

    def test_valid_init_verify(self):
        # Verify path INIT->VERIFY
        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        mac = cipher.digest()

        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        cipher.verify(mac)

    def test_valid_multiple_encrypt_or_decrypt(self):
        for method_name in "encrypt", "decrypt":
            for auth_data in (None, b"333", self.data_128, self.data_128 + b"3"):
                cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
                if auth_data is not None:
                    cipher.update(auth_data)
                method = getattr(cipher, method_name)
                method(self.data_128)
                method(self.data_128)
                method(self.data_128)
                method(self.data_128)

    def test_valid_multiple_digest_or_verify(self):
        # Multiple calls to digest
        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        cipher.update(self.data_128)
        first_mac = cipher.digest()
        for _x in range(4):
            assert first_mac == cipher.digest()

        # Multiple calls to verify
        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        cipher.update(self.data_128)
        for _x in range(5):
            cipher.verify(first_mac)

    def test_valid_encrypt_and_digest_decrypt_and_verify(self):
        # encrypt_and_digest
        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        cipher.update(self.data_128)
        ct, mac = cipher.encrypt_and_digest(self.data_128)

        # decrypt_and_verify
        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        cipher.update(self.data_128)
        pt = cipher.decrypt_and_verify(ct, mac)
        assert self.data_128 == pt

    def test_invalid_mixing_encrypt_decrypt(self):
        # Once per method, with or without assoc. data
        for method1_name, method2_name in (("encrypt", "decrypt"), ("decrypt", "encrypt")):
            for assoc_data_present in (True, False):
                cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
                if assoc_data_present:
                    cipher.update(self.data_128)
                getattr(cipher, method1_name)(self.data_128)
                with pytest.raises(TypeError):
                    getattr(cipher, method2_name)(self.data_128)

    def test_invalid_encrypt_or_update_after_digest(self):
        for method_name in "encrypt", "update":
            cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
            cipher.encrypt(self.data_128)
            cipher.digest()
            with pytest.raises(TypeError):
                getattr(cipher, method_name)(self.data_128)

            cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
            cipher.encrypt_and_digest(self.data_128)

    def test_invalid_decrypt_or_update_after_verify(self):
        cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
        ct = cipher.encrypt(self.data_128)
        mac = cipher.digest()

        for method_name in "decrypt", "update":
            cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
            cipher.decrypt(ct)
            cipher.verify(mac)
            with pytest.raises(TypeError):
                getattr(cipher, method_name)(self.data_128)

            cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
            cipher.decrypt_and_verify(ct, mac)
            with pytest.raises(TypeError):
                getattr(cipher, method_name)(self.data_128)


class TestVectorsPaper:
    """Class exercising the EAX test vectors found in
    http://www.cs.ucdavis.edu/~rogaway/papers/eax.pdf"""

    test_vectors_hex = [
        (
            "6bfb914fd07eae6b",
            "",
            "",
            "e037830e8389f27b025a2d6527e79d01",
            "233952dee4d5ed5f9b9c6d6ff80ff478",
            "62EC67F9C3A4A407FCB2A8C49031A8B3",
        ),
        (
            "fa3bfd4806eb53fa",
            "f7fb",
            "19dd",
            "5c4c9331049d0bdab0277408f67967e5",
            "91945d3f4dcbee0bf45ef52255f095a4",
            "BECAF043B0A23D843194BA972C66DEBD",
        ),
        (
            "234a3463c1264ac6",
            "1a47cb4933",
            "d851d5bae0",
            "3a59f238a23e39199dc9266626c40f80",
            "01f74ad64077f2e704c0f60ada3dd523",
            "70C3DB4F0D26368400A10ED05D2BFF5E",
        ),
        (
            "33cce2eabff5a79d",
            "481c9e39b1",
            "632a9d131a",
            "d4c168a4225d8e1ff755939974a7bede",
            "d07cf6cbb7f313bdde66b727afd3c5e8",
            "8408DFFF3C1A2B1292DC199E46B7D617",
        ),
        (
            "aeb96eaebe2970e9",
            "40d0c07da5e4",
            "071dfe16c675",
            "cb0677e536f73afe6a14b74ee49844dd",
            "35b6d0580005bbc12b0587124557d2c2",
            "FDB6B06676EEDC5C61D74276E1F8E816",
        ),
        (
            "d4482d1ca78dce0f",
            "4de3b35c3fc039245bd1fb7d",
            "835bb4f15d743e350e728414",
            "abb8644fd6ccb86947c5e10590210a4f",
            "bd8e6e11475e60b268784c38c62feb22",
            "6EAC5C93072D8E8513F750935E46DA1B",
        ),
        (
            "65d2017990d62528",
            "8b0a79306c9ce7ed99dae4f87f8dd61636",
            "02083e3979da014812f59f11d52630da30",
            "137327d10649b0aa6e1c181db617d7f2",
            "7c77d6e813bed5ac98baa417477a2e7d",
            "1A8C98DCD73D38393B2BF1569DEEFC19",
        ),
        (
            "54b9f04e6a09189a",
            "1bda122bce8a8dbaf1877d962b8592dd2d56",
            "2ec47b2c4954a489afc7ba4897edcdae8cc3",
            "3b60450599bd02c96382902aef7f832a",
            "5fff20cafab119ca2fc73549e20f5b0d",
            "DDE59B97D722156D4D9AFF2BC7559826",
        ),
        (
            "899a175897561d7e",
            "6cf36720872b8513f6eab1a8a44438d5ef11",
            "0de18fd0fdd91e7af19f1d8ee8733938b1e8",
            "e7f6d2231618102fdb7fe55ff1991700",
            "a4a4782bcffd3ec5e7ef6d8c34a56123",
            "B781FCF2F75FA5A8DE97A9CA48E522EC",
        ),
        (
            "126735fcc320d25a",
            "ca40d7446e545ffaed3bd12a740a659ffbbb3ceab7",
            "cb8920f87a6c75cff39627b56e3ed197c552d295a7",
            "cfc46afc253b4652b1af3795b124ab6e",
            "8395fcf1e95bebd697bd010bc766aac3",
            "22E7ADD93CFC6393C57EC0B3C17D6B44",
        ),
    ]

    test_vectors = [[unhexlify(x) for x in tv] for tv in test_vectors_hex]

    def test(self):
        for assoc_data, pt, ct, mac, key, nonce in self.test_vectors:
            # Encrypt
            cipher = AES.new(key, AES.MODE_EAX, nonce, mac_len=len(mac))
            cipher.update(assoc_data)
            ct2, mac2 = cipher.encrypt_and_digest(pt)
            assert ct == ct2
            assert mac == mac2

            # Decrypt
            cipher = AES.new(key, AES.MODE_EAX, nonce, mac_len=len(mac))
            cipher.update(assoc_data)
            pt2 = cipher.decrypt_and_verify(ct, mac)
            assert pt == pt2


def load_wycheproof_vectors():
    def filter_tag(group):
        return group["tagSize"] // 8

    return load_test_vectors_wycheproof(
        ("Cipher", "wycheproof"),
        "aes_eax_test.json",
        "Wycheproof EAX",
        group_tag={"tag_size": filter_tag},
    )


class TestVectorsWycheproof:
    _id = "None"

    def warn(self, tv):
        if tv.warning and wycheproof_warnings():
            import warnings

            warnings.warn("Wycheproof warning: %s (%s)" % (self._id, tv.comment))

    def check_encrypt(self, tv):
        self._id = "Wycheproof Encrypt EAX Test #" + str(tv.id)

        try:
            cipher = AES.new(tv.key, AES.MODE_EAX, tv.iv, mac_len=tv.tag_size)
        except ValueError as e:
            assert len(tv.iv) == 0 and "Nonce cannot be empty" in str(e)
            return

        cipher.update(tv.aad)
        ct, tag = cipher.encrypt_and_digest(tv.msg)
        if tv.valid:
            assert ct == tv.ct
            assert tag == tv.tag
            self.warn(tv)

    def check_decrypt(self, tv):
        self._id = "Wycheproof Decrypt EAX Test #" + str(tv.id)

        try:
            cipher = AES.new(tv.key, AES.MODE_EAX, tv.iv, mac_len=tv.tag_size)
        except ValueError as e:
            assert len(tv.iv) == 0 and "Nonce cannot be empty" in str(e)
            return

        cipher.update(tv.aad)
        try:
            pt = cipher.decrypt_and_verify(tv.ct, tv.tag)
        except ValueError:
            assert not tv.valid
        else:
            assert tv.valid
            assert pt == tv.msg
            self.warn(tv)

    def check_corrupt_decrypt(self, tv):
        self._id = "Wycheproof Corrupt Decrypt EAX Test #" + str(tv.id)
        if len(tv.iv) == 0 or len(tv.ct) < 1:
            return
        cipher = AES.new(tv.key, AES.MODE_EAX, tv.iv, mac_len=tv.tag_size)
        cipher.update(tv.aad)
        ct_corrupt = strxor(tv.ct, b"\x00" * (len(tv.ct) - 1) + b"\x01")
        with pytest.raises(ValueError):
            cipher.decrypt_and_verify(ct_corrupt, tv.tag)

    @pytest.mark.parametrize("tv", load_wycheproof_vectors(), ids=wycheproof_id)
    def test(self, tv):
        self.check_encrypt(tv)
        self.check_decrypt(tv)
        self.check_corrupt_decrypt(tv)


# EAX with ciphers other than AES, for each of their key sizes
other_ciphers = [(DES, DES.key_size)]
for factory in DES3, ARC2, CAST, Blowfish:
    other_ciphers += [(factory, ks) for ks in factory.key_size]


class TestOtherCiphers:
    @pytest.mark.parametrize(
        "factory, key_size",
        other_ciphers,
        ids=["%s_%d" % (f.__name__.split(".")[-1], ks) for f, ks in other_ciphers],
    )
    def test(self, factory, key_size):
        cipher = factory.new(get_tag_random("cipher", key_size), factory.MODE_EAX, nonce=b"nonce")
        ct, mac = cipher.encrypt_and_digest(b"plaintext")

        cipher = factory.new(get_tag_random("cipher", key_size), factory.MODE_EAX, nonce=b"nonce")
        pt2 = cipher.decrypt_and_verify(ct, mac)

        assert pt2 == b"plaintext"