Unity3D 使用AES方式加密与解密文件

今天小编为大家介绍如何把保存的文件采用AES 方式加密/解密
   1.新建一个unity3d项目，新建一个Test.unity场景，场景里面需要有一个摄像机，并且在摄像机上附加一个SaveAESFile.cs组件类，另外还需要在项目新建一个Resources文件夹，这个文件夹为了存放加密的文件。

       


   2.首先需要一个辅助类AES.cs和一个实体类People.cs,然后代码如下：

      ①AES.cs代码如下：

using System;using System.IO;using System.Security.Cryptography;using System.Text; namespace Utils{    /// <summary>    /// AES加密解密    /// </summary>    public class AES    {        #region 加密        #region 加密字符串        /// <summary>        /// AES 加密(高级加密标准，是下一代的加密算法标准，速度快，安全级别高，目前 AES 标准的一个实现是 Rijndael 算法)        /// </summary>        /// <param name="EncryptString">待加密密文</param>        /// <param name="EncryptKey">加密密钥</param>        public static string AESEncrypt(string EncryptString, string EncryptKey)        {            return Convert.ToBase64String(AESEncrypt(Encoding.Default.GetBytes(EncryptString), EncryptKey));        }        #endregion         #region 加密字节数组        /// <summary>        /// AES 加密(高级加密标准，是下一代的加密算法标准，速度快，安全级别高，目前 AES 标准的一个实现是 Rijndael 算法)        /// </summary>        /// <param name="EncryptString">待加密密文</param>        /// <param name="EncryptKey">加密密钥</param>        public static byte[] AESEncrypt(byte[] EncryptByte, string EncryptKey)        {            if (EncryptByte.Length == 0) { throw (new Exception("明文不得为空")); }            if (string.IsNullOrEmpty(EncryptKey)) { throw (new Exception("密钥不得为空")); }            byte[] m_strEncrypt;            byte[] m_btIV = Convert.FromBase64String("Rkb4jvUy/ye7Cd7k89QQgQ==");            byte[] m_salt = Convert.FromBase64String("gsf4jvkyhye5/d7k8OrLgM==");            Rijndael m_AESProvider = Rijndael.Create();            try            {                MemoryStream m_stream = new MemoryStream();                PasswordDeriveBytes pdb = new PasswordDeriveBytes(EncryptKey, m_salt);                ICryptoTransform transform = m_AESProvider.CreateEncryptor(pdb.GetBytes(32), m_btIV);                CryptoStream m_csstream = new CryptoStream(m_stream, transform, CryptoStreamMode.Write);                m_csstream.Write(EncryptByte, 0, EncryptByte.Length);                m_csstream.FlushFinalBlock();                m_strEncrypt = m_stream.ToArray();                m_stream.Close(); m_stream.Dispose();                m_csstream.Close(); m_csstream.Dispose();            }            catch (IOException ex) { throw ex; }            catch (CryptographicException ex) { throw ex; }            catch (ArgumentException ex) { throw ex; }            catch (Exception ex) { throw ex; }            finally { m_AESProvider.Clear(); }            return m_strEncrypt;        }        #endregion        #endregion         #region 解密        #region 解密字符串        /// <summary>        /// AES 解密(高级加密标准，是下一代的加密算法标准，速度快，安全级别高，目前 AES 标准的一个实现是 Rijndael 算法)        /// </summary>        /// <param name="DecryptString">待解密密文</param>        /// <param name="DecryptKey">解密密钥</param>        public static string AESDecrypt(string DecryptString, string DecryptKey)        {            return Convert.ToBase64String(AESDecrypt(Encoding.Default.GetBytes(DecryptString), DecryptKey));        }        #endregion         #region 解密字节数组        /// <summary>        /// AES 解密(高级加密标准，是下一代的加密算法标准，速度快，安全级别高，目前 AES 标准的一个实现是 Rijndael 算法)        /// </summary>        /// <param name="DecryptString">待解密密文</param>        /// <param name="DecryptKey">解密密钥</param>        public static byte[] AESDecrypt(byte[] DecryptByte, string DecryptKey)        {            if (DecryptByte.Length == 0) { throw (new Exception("密文不得为空")); }            if (string.IsNullOrEmpty(DecryptKey)) { throw (new Exception("密钥不得为空")); }            byte[] m_strDecrypt;            byte[] m_btIV = Convert.FromBase64String("Rkb4jvUy/ye7Cd7k89QQgQ==");            byte[] m_salt = Convert.FromBase64String("gsf4jvkyhye5/d7k8OrLgM==");            Rijndael m_AESProvider = Rijndael.Create();            try            {                MemoryStream m_stream = new MemoryStream();                PasswordDeriveBytes pdb = new PasswordDeriveBytes(DecryptKey, m_salt);                ICryptoTransform transform = m_AESProvider.CreateDecryptor(pdb.GetBytes(32), m_btIV);                CryptoStream m_csstream = new CryptoStream(m_stream, transform, CryptoStreamMode.Write);                m_csstream.Write(DecryptByte, 0, DecryptByte.Length);                m_csstream.FlushFinalBlock();                m_strDecrypt = m_stream.ToArray();                m_stream.Close(); m_stream.Dispose();                m_csstream.Close(); m_csstream.Dispose();            }            catch (IOException ex) { throw ex; }            catch (CryptographicException ex) { throw ex; }            catch (ArgumentException ex) { throw ex; }            catch (Exception ex) { throw ex; }            finally { m_AESProvider.Clear(); }            return m_strDecrypt;        }        #endregion        #endregion     }}

②People.cs 代码如下：

using System;namespace Assets{    [Serializable]     public class People    {        public People()        {        }        public int ID;        public string Name;        public int Age;    }}

 3.直接是SaveAESFile.cs的核心代码

using UnityEngine;using Assets;using System.Text;using System;using System.IO;using Utils; public class SaveAESFile : MonoBehaviour{     public string FilePath = "";    private People _people;    private string info = "";     /// <summary>    /// AES 密码保存    /// </summary>    private const string _password = "qq123";     /// <summary>    /// 一次处理的明文字节数    /// </summary>    public static readonly int encryptSize = 10000000;    /// <summary>    /// 一次处理的密文字节数    /// </summary>    public static readonly int decryptSize = 10000016;      void Awake()    {        FilePath = Application.dataPath + @"/Resources/SaveAESFile.json";    }     void OnGUI()    {        // 文本显示        GUI.Label(new Rect(50, 200, 200, 50), info);          // 第一个文字按钮        GUI.color = Color.yellow;  //按钮文字颜色          GUI.backgroundColor = Color.red; //按钮背景颜色         if (GUI.Button(new Rect(50, 250, 200, 30), "保存加密文件"))        {            info = "保存加密文件！";            AESSaveFile();        }         // 第二个图片按钮        GUI.color = Color.white;  //按钮文字颜色          GUI.backgroundColor = Color.red; //按钮背景颜色         if (GUI.Button(new Rect(50, 300, 200, 30), "显示解密文件"))        {            ShowAESFile();            info = "显示解密文件！";            People temp = _people;            info = "ID:" + _people.ID + "   " + "Name:" + _people.Name + "    " + "Age:" + _people.Age;        }     }      void AESSaveFile()    {        AddData();        byte[] texts = new byte[] { };        try        {            string autoSaveJson = JsonUtility.ToJson(_people);            //加密            texts = Utils.AES.AESEncrypt(Encoding.UTF8.GetBytes(autoSaveJson), _password);        }        catch (Exception e)        {            Debug.LogError("Message:" + e.Message);        }        if (File.Exists(FilePath))        {            File.Delete(FilePath);        }        using (FileStream fs = new FileStream(FilePath, FileMode.OpenOrCreate, FileAccess.Write))        {            if (fs != null)            {                fs.Write(texts, 0, texts.Length);                fs.Flush();                fs.Dispose();            }        }    }     void ShowAESFile()    {        try        {            string DecrypText = string.Empty;            using (FileStream fs = new FileStream(FilePath, FileMode.Open, FileAccess.Read))            {                if (fs.Length > 0)                {                    int blockCount = ((int)fs.Length - 1) / decryptSize + 1;                    for (int i = 0; i < blockCount; i++)                    {                        int size = decryptSize;                        if (i == blockCount - 1) size = (int)(fs.Length - i * decryptSize);                        byte[] bArr = new byte[size];                        fs.Read(bArr, 0, size);                        //解密                        byte[] result = AES.AESDecrypt(bArr, _password);                        DecrypText += Encoding.UTF8.GetString(result);                    }                    fs.Close();                    fs.Dispose();                }            }            _people = JsonUtility.FromJson<People>(DecrypText);        }        catch (Exception e)        {            Debug.LogError("Message:" + e.Message);        }    }     void AddData()    {        _people = new People();        _people.ID = 1;        _people.Name = "小白兔";        _people.Age = 18;    }}

  4.最后便是执行项目看效果啦！
    ①点击解密保存文件，我们会发现在Resources下面会生成一个.json文件，如图下：
    
        


        
         
    ②当我们点击按钮解密显示文件时，会发现加密的文件的内容被解密，如图下：