Invalid length for a Base-64 char array or string.

Question

I'm learning MVC and for creating Login and Register with Custom Existing Database I followed this tutorial and created custom User Manager and Sign In Manager. It allowed me to register a user properly and users are saved in my db properly. But password is saved as string without encryption as user entered it and also while login CheckPasswordAsync returns System.FormatException: Invalid length for a Base-64 char array or string. For Implementing UserPasswordStore I followed this tutorial code for my custom signinmanager and User store is

public class CustomUserManager : UserManager<MyAppUser>
{
    public CustomUserManager(IUserStore<MyAppUser> store) : base(store) { }

    internal static CustomUserManager Create()
    {
        return new CustomUserManager(new CustomUserStore());
    }

    public override Task<bool> CheckPasswordAsync(MyAppUser user, string password)
    {
        return base.CheckPasswordAsync(user, password);
    }
}

public class CustomUserStore : IUserStore<MyAppUser>, IUserPasswordStore<MyAppUser>
{
    private LearningDBContext database;

    public Task CreateAsync(MyAppUser user)
    {
        try
        {
            var context = userStore.Context as LearningDBContext;
            context.MyAppUsers.Add(user);
            context.Configuration.ValidateOnSaveEnabled = false;
            return context.SaveChangesAsync();
        }
        catch { }
        return Task.FromResult<bool>(true);
    }

    #endregion


    #region Password Store Region
    public Task SetPasswordHashAsync(MyAppUser user, string passwordHash)
    {
        var identityUser = ToIdentityUser(user);
        var task = userStore.HasPasswordAsync(identityUser);
        setMyAppUser(user, identityUser);
        return Task.FromResult(0);
    }

    private void setMyAppUser(MyAppUser user, IdentityUser identityUser)
    {
        user.Password = identityUser.PasswordHash;
        user.Id = identityUser.Id;
        user.UserName = identityUser.UserName;
    }

    public Task<string> GetPasswordHashAsync(MyAppUser user)
    {
        var identityUser = ToIdentityUser(user);
        var task = userStore.GetPasswordHashAsync(identityUser);
        setMyAppUser(user, identityUser);
        return task;
    }

    public Task<bool> HasPasswordAsync(MyAppUser user)
    {
        var identityUser = ToIdentityUser(user);
        var task = userStore.HasPasswordAsync(identityUser);
        setMyAppUser(user, identityUser);
        return task;
    }

    private IdentityUser ToIdentityUser(MyAppUser user)
    {
        return new IdentityUser()
        {
            Id = user.Id,
            PasswordHash = user.Password,
            UserName = user.UserName
        };
    }
    #endregion
}

and in controller I'm calling

var result = await SignInManager.PasswordSignInAsync(model.Email, model.Password, model.RememberMe, false);

I can't figure out the reason. Can anybody help?

Answer 1

Thanks to help from @trailmax I was able to solve this problem. I was saving password directly and as I was using default implementation without overriding system was checking for hashed password. So, I needed to either save hashed password or override CheckPassword method for checking manually. It works both ways.