I refer to ExecuteLogin method (LoginViewModel.cs) in Crosslight Business project template. It has CreateEncryptedAccount(username, password) to create the encrypted account, to hash the password from the client side.

You can implement your own custom password hasher by creating a class which derives BasicWebApiAuthenticator, then override CreateEncryptedAccount

public override IAccount CreateEncryptedAccount(string username, string password)
    {
        //return this.GetDefaultAuthenticator().CreateEncryptedAccount(username, password);
        IHashCryptographicService cryptoService = ServiceProvider.GetService<IHashCryptographicService>();
            
        // assign signature with encrypted password 
        string signature = ...;
            
        var account = new Account(username, this.AccountServiceId, new Dictionary<string, object> { { Account.PasswordHash, signature } });

        if (this.AccountServiceId != this.ServiceId)
            account.Properties[Account.AuthenticatorServiceIdentifier] = this.ServiceId;

        return account;
    }

Hope this helps.

On top of Yudi's response, of course, you'll also need to create a custom class that derives from WebApiAccountService where you need to override the RegisterDefaultAuthenticator and GetDefaultAuthenticator methods, to link the default authenticator to the one you created in the step above. See the following example.

public class MyWebApiAccountService : WebApiAccountService
{

    protected override void RegisterDefaultAuthenticator()    {
        this.AuthenticationService.Register<CustomWebApiAuthenticator>(this.AccountServiceId);
    }
     
    protected override WebApiAuthenticator GetDefaultAuthenticator()
    {
        return this.AuthenticationService.GetAuthenticator<CustomWebApiAuthenticator>();
    }


}

Finally, remember to replace the new authenticator in the AppService.

           
ServiceProvider.AddService<IAccountService, MyWebApiAccountService>();

And that's the beauty of IoC design pattern which is heavily used in Crosslight. It allows you to extend or replace most functionalities in Crosslight, just like that.

Hope this helps.

Glad to hear everything works out great for you!

If you've submitted any Crosslight apps to Store, please let us know and we'd love to see it in action. :)