Unity、ZDatabase改良案

Encryption.cs

using UnityEngine;
using System.Collections;

public static class Encryption {

	//=================================================================================
	//保存
	//=================================================================================

	public static void SaveInt(string key, int value){
		ZDatabase.instance.WriteEnc (EncryptKey(key), value);
	}
	public static void SaveFloat(string key, float value){
		ZDatabase.instance.WriteEnc (EncryptKey(key), value);
	}
	public static void SaveBool(string key, bool value){
		ZDatabase.instance.WriteEnc (EncryptKey(key), value);
	}
	public static void SaveString(string key, string value){
		ZDatabase.instance.WriteEnc (EncryptKey(key), value);
	}
	public static void SaveVector3(string key, Vector3 value){
		ZDatabase.instance.WriteEnc (EncryptKey(key), value);
	}
	public static void SaveQuaternion(string key, Quaternion value){
		Vector3 vec3 = value.eulerAngles;
		ZDatabase.instance.WriteEnc (EncryptKey(key), vec3);
	}

	//=================================================================================
	//読み込み
	//=================================================================================

	public static int LoadInt(string key, int defult){
		return ZDatabase.instance.ReadEncInt (EncryptKey(key), defult);
	}
	public static float LoadFloat(string key, float defult){
		return ZDatabase.instance.ReadEncFloat (EncryptKey(key), defult);
	}
	public static bool LoadBool(string key, bool defult){
		return ZDatabase.instance.ReadEncBool (EncryptKey(key), defult);
	}
	public static string LoadString(string key, string defult){
		string loadStr = ZDatabase.instance.ReadEncString (EncryptKey(key));
		if(string.IsNullOrEmpty(loadStr)){
			return defult;
		}
		return loadStr; 
	}
	public static Vector3 LoadVector3(string key, Vector3 defult){
		Vector3 loadVector3 = ZDatabase.instance.ReadEncVector3 (EncryptKey(key));
		if(Vector3.Distance(loadVector3, Vector3.zero) == 0){
			return defult;
		}

		return loadVector3;
	}
	public static Quaternion LoadQuaternion(string key, Quaternion defult){

		Vector3 loadVector3 = ZDatabase.instance.ReadEncVector3 (EncryptKey(key));
		if(Vector3.Distance(loadVector3, Vector3.zero) == 0){
			return defult;
		}
			
		Quaternion qua = Quaternion.Euler (loadVector3);
		return qua;
	}

	//=================================================================================
	//Key暗号化
	//=================================================================================

	private const string PASS = "t9w5z3r5ggbuytzbghca";

	private static string EncryptKey(string sourceString)
	{
		//RijndaelManagedオブジェクトを作成
		System.Security.Cryptography.RijndaelManaged rijndael =
			new System.Security.Cryptography.RijndaelManaged();

		//パスワードから共有キーと初期化ベクタを作成
		byte[] key, iv;
		GenerateKeyFromPassword( 
		rijndael.KeySize, out key, rijndael.BlockSize, out iv);
		rijndael.Key = key;
		rijndael.IV = iv;

		//文字列をバイト型配列に変換する
		byte[] strBytes = System.Text.Encoding.UTF8.GetBytes(sourceString);

		//対称暗号化オブジェクトの作成
		System.Security.Cryptography.ICryptoTransform encryptor =
			rijndael.CreateEncryptor();
		//バイト型配列を暗号化する
		byte[] encBytes = encryptor.TransformFinalBlock(strBytes, 0, strBytes.Length);
		//閉じる
		encryptor.Dispose();

		//バイト型配列を文字列に変換して返す
		return System.Convert.ToBase64String(encBytes);
	}

	private static void GenerateKeyFromPassword( int keySize, out byte[] key, int blockSize, out byte[] iv)
	{
		//パスワードから共有キーと初期化ベクタを作成する
		//saltを決める
		byte[] salt = System.Text.Encoding.UTF8.GetBytes("saltは必ず8バイト以上");
		//Rfc2898DeriveBytesオブジェクトを作成する
		System.Security.Cryptography.Rfc2898DeriveBytes deriveBytes =
			new System.Security.Cryptography.Rfc2898DeriveBytes(PASS, salt);
		//反復処理回数を指定する デフォルトで1000回
		deriveBytes.IterationCount = 1000;

		//共有キーと初期化ベクタを生成する
		key = deriveBytes.GetBytes(keySize / 8);
		iv = deriveBytes.GetBytes(blockSize / 8);
	}

}