using System;

using Isopoh.Cryptography.Argon2;

using System.Security.Cryptography;

using System.Text;

​

public class Program

{

    // https://datatracker.ietf.org/doc/html/rfc4648#section-5

    public static string UriSafeBase64Encode(byte[] bytes)

    {

        return Convert.ToBase64String(bytes)

            .Replace("+", "-")

            .Replace("/", "_")

            .Replace("=", "");

    }

    public static byte[] UriSafeBase64Decode(string data)

    {

        string[] pads = {"", "=", "==", "==="};

        var d = data

            .Replace("-", "+")

            .Replace("_", "/");

        var pad = d.Length & 0x0003;

        if(pad>0)

        d += pads[4-pad];

        return Convert.FromBase64String(d);

    }

    public static void Main()

    {

        var salt = RandomNumberGenerator.GetBytes(32);

        var encodedsalt = UriSafeBase64Encode(salt);

        var password = "pippo";

        var passwordBytes = Encoding.UTF8.GetBytes(password);

        var secret = Encoding.UTF8.GetBytes("secret");

        var config = new Argon2Config

        {

            Type = Argon2Type.DataIndependentAddressing,

            Version = Argon2Version.Nineteen,

            TimeCost = 10,

            MemoryCost = 32768,

            Lanes = 5,

            Threads = Environment.ProcessorCount, // higher than "Lanes" doesn't help (or hurt)

            Password = passwordBytes,

            Salt = salt, // >= 8 bytes if not null

            Secret = secret, // from somewhere

            AssociatedData = null, // from somewhere

            HashLength = 20 // >= 4

        };

        var argon2A = new Argon2(config);

        string hashString;

        using(var hashA = argon2A.Hash())

        {

            hashString = config.EncodeString(hashA.Buffer);

            //var hashString = UriSafeBase64Encode(hashA.Buffer);

            Console.WriteLine(hashString);

        }

        //var passwordHash = Argon2.Hash(password);

        //Console.WriteLine(passwordHash.GetType());

        if (Argon2.Verify(hashString, passwordBytes, 5))

        {

            Console.WriteLine("OK");

        }

    }

}