How Do I Use An Already Existing Authentication Table In Mysql For Wordpress

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ASP.NET

PHP

Hi
I am looking for something which may look wierd to some guyz.
I already have a pre-existing ASP.NET website that is using authentication and the database is MySQL

Now that i have madeanother website which is based on WooCommerce and Wordpress
I am having an authentication Page and a Table in Database too.

But for the ease of my users and simplification of interface,
I want to have the user's Login data to be the same.

The Problem i am facing here is, WP uses the user password in hashed format which is encrypted and decrypted internally.
How do i achieve this for my already existing ASP.NET project !

Thanks in advance.