How to migrate users from ASP.NET MVC+EF+MSSQL to PHP+MySQL?

Question

PHP

There is an ASP.NET MVC site that works with MSSQL database through Entity Framework. Also used asp.net identity. It needs to be rewritten in php + mysql. This transfer should not affect the user. The issue of transferring users is of concern - their contact data + password hashes and the algorithm by which these hashes are obtained. Are there any ideas how this can be done? All data about users with password hashes is in the database and it is not a problem to take them out. But how to check the authenticity of the user's password after importing these hashes into a site in php is not clear.

Answer 1

launch a new version of the site secretly, when users log in to the old site, use their password to make a new hash for the new version of the site. who did not come in the near future - reset the password, let them restore it.