title: Migrating existing users from MVC 4 SimpleMembership to MVC 5 ASP.NET Identity
body: <p>I have an <strong>MVC 4 site</strong> that currently implements <strong>SimpleMembership</strong>. In the next iteration of the site I would like to <strong>upgrade to MVC 5 and ASP.NET Identity</strong>. Both sites have the same machine key in web.config. The SimpleMembership SQL tables have a column for <strong>Password</strong> <em>and</em> <strong>PaswordSalt</strong> the ASP.NET Identity tables have a column for <code>PasswordHash</code> which seems to be a combination of <strong>Password + PasswordSalt</strong>. </p>
  
  <p>I tried concatenating the <strong>Password</strong> and <strong>PasswordSlat</strong> together from the old site but this doesn’t work. </p>
  
  <p>My question is, </p>
  
  <p><strong>how do I migrate my existing user’s passwords from the old site to the new site?</strong></p>