chunk 1: core gameplay scripts scenes runtime assets

Assets/Scripts/Utilities/SecurePlayerPrefs.cs

@@ -0,0 +1,74 @@
+using System;
+using System.IO;
+using System.Security.Cryptography;
+using UnityEngine;
+
+public static class SecurePlayerPrefs
+{
+    private static readonly byte[] salt = new byte[] { 0x13, 0x24, 0x37, 0x48, 0x59, 0x6A, 0x7B, 0x8C };
+    private static readonly byte[] key = new byte[] { 0x6D, 0x5B, 0x35, 0x81, 0x49, 0x93, 0xD8, 0x10, 0x52, 0x7E, 0x2B, 0x19, 0x4C, 0xFA, 0x67, 0x8A };
+
+    public static void SetString(string key, string value)
+    {
+        byte[] encrypted = EncryptStringToBytes(value);
+        string encoded = Convert.ToBase64String(encrypted);
+        PlayerPrefs.SetString(key, encoded);
+    }
+
+    public static string GetString(string key, string defaultValue = "")
+    {
+        string encoded = PlayerPrefs.GetString(key, defaultValue);
+        byte[] encrypted = Convert.FromBase64String(encoded);
+        string value = DecryptStringFromBytes(encrypted);
+        return value;
+    }
+
+    private static byte[] EncryptStringToBytes(string plainText)
+    {
+        byte[] encrypted;
+        using (Aes aesAlg = Aes.Create())
+        {
+            aesAlg.Key = key;
+            aesAlg.IV = salt;
+
+            ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);
+
+            using (MemoryStream msEncrypt = new MemoryStream())
+            {
+                using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
+                {
+                    using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
+                    {
+                        swEncrypt.Write(plainText);
+                    }
+                    encrypted = msEncrypt.ToArray();
+                }
+            }
+        }
+        return encrypted;
+    }
+
+    private static string DecryptStringFromBytes(byte[] cipherText)
+    {
+        string plaintext = null;
+        using (Aes aesAlg = Aes.Create())
+        {
+            aesAlg.Key = key;
+            aesAlg.IV = salt;
+
+            ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
+
+            using (MemoryStream msDecrypt = new MemoryStream(cipherText))
+            {
+                using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
+                {
+                    using (StreamReader srDecrypt = new StreamReader(csDecrypt))
+                    {
+                        plaintext = srDecrypt.ReadToEnd();
+                    }
+                }
+            }
+        }
+        return plaintext;
+    }
+}