PasswordlessWebLogin/Base64UrlConverter.cs

namespace Passwordless;

public static class Base64UrlConverter
{
    public static byte[] Decode(string value)
    {
        var base64 = value
            .Replace('-', '+')
            .Replace('_', '/');
        
        if (base64.Length % 4 != 0)
        {
            base64 += new string('=', 4 - base64.Length % 4);
        }
        
        return Convert.FromBase64String(base64);
    }

    public static string Encode(byte[] value)
    {
        var base64 = Convert.ToBase64String(value);

        return base64
            .Replace('+', '-')
            .Replace('/', '_')
            .TrimEnd('=');
    }
}