ASP>NET Identity: How to compare a password entered by the user with a hashed password?

I've created a table called `PasswordHistory`. Each time a user changes the password, the current password is supposed to be copied to PasswordHistory table. The policy is the most restrictive of the following 2: - User cannot use any of the last 8 passwords - or a password that it has used in the last 2 years I'd like to know how to compare a newly entered password with an existing one but that is hashed? Here's my code: ``` var _limitDate = DateTime.Now.AddYears(-2); int n = db.PasswordsHistory.Where(pwd => pwd.UserId == userId && pwd.ChangeDate > _limitDate).Count(); var pwdList = new List<PasswordHistory>(); if(n >= 8) { pwdList = db.PasswordsHistory .Where(pwd => pwd.ChangeDate > _limitDate) .ToList(); } else { pwdList = db.PasswordsHistory .OrderByDescending(pwd => pwd.ChangeDate) .Take(8) .ToList(); } if (pwdList.Count == 0) { return false; } else { foreach (var pwd in pwdList) { //compare the password entered by the user with the password stored in the PasswordHistory table } } ``` Thanks for helping