Find matching binary parts of a file regardless of offset

BinarySubset.cs

namespace BinarySubset
{
    internal class Program
    {
        static void Main(string[] args)
        {
            const int minBytes = 15;
            const int minUniques = 5;
            var uniqueBytes = new bool[256];

            var aFile = File.ReadAllBytes(args[0]);
            var bFile = File.ReadAllBytes(args[1]);

            for (var aIndex = 0; aIndex < aFile.Length; aIndex++)
            {
                for (var bIndex = 0; bIndex < bFile.Length; bIndex++)
                {
                    if (bFile[bIndex] == aFile[aIndex])
                    {
                        // Start matching
                        Array.Clear(uniqueBytes);
                        var aMatchIndex = aIndex;
                        var bMatchIndex = bIndex;
                        var length = 0;
                        while (aMatchIndex < aFile.Length && bMatchIndex < bFile.Length && aFile[aMatchIndex] == bFile[bMatchIndex])
                        {
                            uniqueBytes[aFile[aMatchIndex]] = true;
                            aMatchIndex++;
                            bMatchIndex++;
                            length++;
                        }
                        if (length >= minBytes)
                        {
                            var foundUniques = uniqueBytes.Count(b => b == true);
                            if (foundUniques > minUniques)
                                Console.WriteLine($"Matched {length} bytes with {foundUniques} unique bytes at {aIndex} (A) and {bIndex} (B)");
                        }
                    }
                }
            }
        }
    }
}