using System;
using LibHac.Crypto;
using LibHac.Util;
using Xunit;

namespace LibHac.Tests;

public class AesCmac
{
    public static readonly TheoryData<TestData> TestVectors = new TheoryData<TestData>
    {
        new TestData
        {
            Key = "2B7E151628AED2A6ABF7158809CF4F3C".ToBytes(),
            Message = "".ToBytes(),
            Expected = "BB1D6929E95937287FA37D129B756746".ToBytes()
        },
        new TestData
        {
            Key = "2B7E151628AED2A6ABF7158809CF4F3C".ToBytes(),
            Message = "6BC1BEE22E409F96E93D7E117393172A".ToBytes(),
            Expected = "070A16B46B4D4144F79BDD9DD04A287C".ToBytes(),
            Length = 0x10
        },
        new TestData
        {
            Key = "2B7E151628AED2A6ABF7158809CF4F3C".ToBytes(),
            Message = "6BC1BEE22E409F96E93D7E117393172AAE2D8A571E03AC9C9EB76FAC45AF8E5130C81C46A35CE411".ToBytes(),
            Expected = "DFA66747DE9AE63030CA32611497C827".ToBytes(),
            Length = 0x28
        },
        new TestData
        {
            Key = "2B7E151628AED2A6ABF7158809CF4F3C".ToBytes(),
            Message = "6BC1BEE22E409F96E93D7E117393172AAE2D8A571E03AC9C9EB76FAC45AF8E5130C81C46A35CE411E5FBC1191A0A52EFF69F2445DF4F9B17AD2B417BE66C3710".ToBytes(),
            Expected = "51F0BEBF7E3B9D92FC49741779363CFE".ToBytes(),
            Length = 0x40
        },
        new TestData
        {
            Key = "2B7E151628AED2A6ABF7158809CF4F3C".ToBytes(),
            Message = "00000000006BC1BEE22E409F96E93D7E117393172A0000000000".ToBytes(),
            Expected = "070A16B46B4D4144F79BDD9DD04A287C".ToBytes(),
            Start = 5,
            Length = 0x10
        },
        new TestData
        {
            Key = "2B7E151628AED2A6ABF7158809CF4F3C".ToBytes(),
            Message = "00000000006BC1BEE22E409F96E93D7E117393172A0000000000000000000000".ToBytes(),
            Expected = "070A16B46B4D4144F79BDD9DD04A287C".ToBytes(),
            Start = 5,
            Length = 0x10
        }
    };

    [Theory]
    [MemberData(nameof(TestVectors))]
    public static void TestCmacTestVectors(TestData data)
    {
        byte[] actual = new byte[0x10];

        Aes.CalculateCmac(actual, data.Message.AsSpan(data.Start, data.Length), data.Key);

        Assert.Equal(data.Expected, actual);
    }

    public struct TestData
    {
        public byte[] Key;
        public byte[] Message;
        public byte[] Expected;
        public int Start;
        public int Length;
    }
}