Initial commit

Utils/PasswordHash.cs

@@ -0,0 +1,64 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Security.Cryptography;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Utils
+{
+    public class PasswordHash
+    {
+        private static Random random = new Random();
+
+        public static byte[] getNextSalt()
+        {
+            byte[] salt = new byte[20];
+            random.NextBytes(salt);
+            return salt;
+        }
+
+        public static byte[] Hash(string password, byte[] salt)
+        {
+            HashAlgorithm algorithm = new SHA256Managed();
+
+            byte[] bytePassword = Encoding.UTF8.GetBytes(password);
+            byte[] plainTextWithSaltBytes = new byte[bytePassword.Length + salt.Length];
+
+            for (int i = 0; i < bytePassword.Length; i++)
+            {
+                plainTextWithSaltBytes[i] = bytePassword[i];
+            }
+
+            for (int i = 0; i < salt.Length; i++)
+            {
+                plainTextWithSaltBytes[bytePassword.Length + i] = salt[i];
+            }
+
+            return algorithm.ComputeHash(plainTextWithSaltBytes);
+        }
+
+        public static bool Compare(string password, byte[] salt, byte[] hashed)
+        {
+            if (password == null) return false;
+            if (hashed == null) return false;
+
+            byte[] hashedNew = Hash(password, salt);
+
+            if (hashedNew.Length != hashed.Length)
+            {
+                return false;
+            }
+
+            for (int i = 0; i < hashedNew.Length; i++)
+            {
+                if (hashedNew[i] != hashed[i])
+                {
+                    return false;
+                }
+            }
+
+            return true;
+        }
+    }
+}