使用pfx证书加密解密问题，求大侠帮忙，万分感激

悬赏园豆：20 [已关闭问题]

我的程序首先使用.net自带的工具makecer.exe来生成带有私钥的pfx证书，然后想要使用此证书来实现RSA加密解密，但是在用公钥加密的时候没问题，用私钥解密的时候出现问题，提示或者是“该项不适于在指定状态下使用”，或者是“不正确的项”

protected void Button6_Click(object sender, EventArgs e)
{
string CurrentPath = Server.MapPath("./");//获得所在页面的当前目录，等价于Server.MapPath("")。

        CreateCertWithPrivateKey("mycer.pfx", Server.MapPath("makecert.exe"));
        ExportToPfxFile("mycer.pfx", CurrentPath+"mypfx.pfx", "123", true);
    }

    /// <summary>
    /// 根据指定的证书名和makecert全路径生成证书（包含公钥和私钥，并保存在MY存储区）
    /// </summary>
    /// <param name="subjectName"></param>
    /// <param name="makecertPath"></param>
    /// <returns></returns>
    public static bool CreateCertWithPrivateKey(string subjectName, string makecertPath)
    {
        subjectName = "CN=" + subjectName;
        string param = " -pe -ss my -n \"" + subjectName + "\" ";
        try
        {
            Process p = Process.Start(makecertPath, param);
            p.WaitForExit();
            p.Close();
        }
        catch (Exception e)
        {
          // LogRecord.putErrorLog(e.ToString(), "DataCerficate.CreateCertWithPrivateKey");
            return false;
        }
        return true;
    }

    /// <summary>
    /// 从WINDOWS证书存储区的个人MY区找到主题为subjectName的证书，
    /// 并导出为pfx文件，同时为其指定一个密码
    /// 并将证书从个人区删除(如果isDelFromstor为true)
    /// </summary>
    /// <param name="subjectName">证书主题，不包含CN=</param>
    /// <param name="pfxFileName">pfx文件名</param>
    /// <param name="password">pfx文件密码</param>
    /// <param name="isDelFromStore">是否从存储区删除</param>
    /// <returns></returns>
    public static bool ExportToPfxFile(string subjectName, string pfxFileName,
        string password, bool isDelFromStore)
    {
        subjectName = "CN=" + subjectName;
        X509Store store = new X509Store(StoreName.My, StoreLocation.CurrentUser);
        store.Open(OpenFlags.ReadWrite);
        X509Certificate2Collection storecollection = (X509Certificate2Collection)store.Certificates;
        foreach (X509Certificate2 x509 in storecollection)
        {
            if (x509.Subject == subjectName)
            {
                Debug.Print(string.Format("certificate name: {0}", x509.Subject));

                byte[] pfxByte = x509.Export(X509ContentType.Pfx, password);
                using (FileStream fileStream = new FileStream(pfxFileName, FileMode.Create))
                {
                    // Write the data to the file, byte by byte.
                    for (int i = 0; i < pfxByte.Length; i++)
                        fileStream.WriteByte(pfxByte[i]);
                    // Set the stream position to the beginning of the file.
                    fileStream.Seek(0, SeekOrigin.Begin);
                    // Read and verify the data.
                    for (int i = 0; i < fileStream.Length; i++)
                    {
                        if (pfxByte[i] != fileStream.ReadByte())
                        {
                         //   LogRecord.putErrorLog("Export pfx error while verify the pfx file!", "ExportToPfxFile");
                            fileStream.Close();
                            return false;
                        }
                    }
                    fileStream.Close();
                }
                if (isDelFromStore == true)
                    store.Remove(x509);
            }
        }
        store.Close();
        store = null;
        storecollection = null;
        return true;
    }