title: Identity - VerifyHashedPassword method does not work well
body: <p>I have really strange problem with ASP.NET Identity and EntityFramework.
  I have a login form, from which I receive username and password.
  Then I check if the user exist in the database.
  After that I call the UserManager's method VerifyHashedPassword to verify that the user password from database and that from the form are the same. Everything is OK, but for some of the users in the database, the method give me result that the given password and the hashed password are not the same (but they actually are). I just can't figure out why for some of the users password verification fails.</p>
  
  <p>Here's my code.</p>
  
  <pre><code>public async Task&lt;User&gt; FindUserAsync(string userName, string password)
      {
          User user;
  
          if (password != null)
          {
              user = await _userManager.FindByNameAsync(userName);
  
              if (user == null)
              {
                  user = await _userManager.FindByEmailAsync(userName);
              }
  
              var result = _userManager.PasswordHasher.VerifyHashedPassword(user.PasswordHash, password);
  
              if (!(result == PasswordVerificationResult.Success))
              {
                  return null;
              }
          }            
  
          return user;
      }
  </code></pre>