Adds PasswordHasher + DbSetup

Core/Core.csproj

@@ -19,8 +19,4 @@
     <PackageReference Include="npgsql" Version="9.0.2" />
   </ItemGroup>
 
-  <ItemGroup>
-    <Folder Include="Entities\" />
-  </ItemGroup>
-
 </Project>

Core/Entities/Users/Class1.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Core.Entities.Users
+{
+    public class User
+    {
+        public int Id { get; set; }
+        public string Email { get; set; }
+        public string PasswordHash { get; set; }
+        public string SecurityStamp { get; set; }
+        public bool EmailConfirmed { get; set; }
+        public DateTime CreatedDate { get; set; }
+        public DateTime? LastLoginDate { get; set; }
+    }
+
+    public class Tenant
+    {
+        public int Id { get; set; }
+        public string ConnectionString { get; set; }
+        public DateTime CreatedDate { get; set; }
+        public int CreatedBy { get; set; }
+        public bool IsActive { get; set; }
+    }
+
+    public class UserTenant
+    {
+        public int UserId { get; set; }
+        public int TenantId { get; set; }
+        public DateTime CreatedDate { get; set; }
+    }
+}

Core/Entities/Users/PasswordHasher.cs

@@ -0,0 +1,47 @@
+namespace Core.Entities.Users
+{
+    public static class PasswordHasher
+    {
+        private const int _saltSize = 16; // 128 bit
+        private const int _keySize = 32;  // 256 bit
+        private const int _iterations = 100000;
+
+        public static string HashPassword(string password)
+        {
+            using (var algorithm = new System.Security.Cryptography.Rfc2898DeriveBytes(
+                password,
+                _saltSize,
+                _iterations,
+                System.Security.Cryptography.HashAlgorithmName.SHA256))
+            {
+                var key = Convert.ToBase64String(algorithm.GetBytes(_keySize));
+                var salt = Convert.ToBase64String(algorithm.Salt);
+
+                return $"{_iterations}.{salt}.{key}";
+            }
+        }
+
+        public static bool VerifyPassword(string hash, string password)
+        {
+            var parts = hash.Split('.', 3);
+            if (parts.Length != 3)
+            {
+                return false;
+            }
+
+            var iterations = Convert.ToInt32(parts[0]);
+            var salt = Convert.FromBase64String(parts[1]);
+            var key = Convert.FromBase64String(parts[2]);
+
+            using (var algorithm = new System.Security.Cryptography.Rfc2898DeriveBytes(
+                password,
+                salt,
+                iterations,
+                System.Security.Cryptography.HashAlgorithmName.SHA256))
+            {
+                var keyToCheck = algorithm.GetBytes(_keySize);
+                return keyToCheck.SequenceEqual(key);
+            }
+        }
+    }
+}