Begin script abstraction

ReallifeGamemode.Server.Common/PasswordHasher.cs

@@ -0,0 +1,40 @@
+using Microsoft.AspNetCore.Cryptography.KeyDerivation;
+using System;
+using System.Collections.Generic;
+using System.Security.Cryptography;
+using System.Text;
+
+namespace ReallifeGamemode.Server.Common
+{
+  public class PasswordHasher
+  {
+    public static byte[] GetNewSalt(int length = 256)
+    {
+      if ((length % 8) != 0)
+      {
+        throw new ArgumentException("Length mus be completely divisble through 8");
+      }
+
+      var salt = new byte[length / 8];
+
+      using (var rng = RandomNumberGenerator.Create())
+      {
+        rng.GetBytes(salt);
+      }
+
+      return salt;
+    }
+
+    public static string HashPassword(string password, byte[] salt, int length = 512)
+    {
+      if ((length % 8) != 0)
+      {
+        throw new ArgumentException("Length mus be completely divisble through 8");
+      }
+
+      var hashedPassword = KeyDerivation.Pbkdf2(password, salt, KeyDerivationPrf.HMACSHA512, 50000, length / 8);
+
+      return Convert.ToBase64String(hashedPassword);
+    }
+  }
+}