C#文件加密方法汇总
本文实例汇总了C#文件加密方法。分享给大家供大家参考。具体实现方法如下：
1、AES加密类
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
}
}
2、文件加密类
using System.IO;
using System;
namespace Utils
{
/// <summary>
/// 文件加密类
/// </summary>
public class FileEncrypt
{
#region 变量
/// <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;
#endregion
#region 加密文件
/// <summary>
/// 加密文件
/// </summary>
public static void EncryptFile(string path, string pwd, RefreshFileProgress refreshFileProgress)
{
try
{
if (File.Exists(path + ".temp")) File.Delete(path + ".temp");
using (FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read))
{
if (fs.Length > 0)
{
using (FileStream fsnew = new FileStream(path + ".temp", FileMode.OpenOrCreate, FileAccess.Write))
{
if (File.Exists(path + ".temp")) File.SetAttributes(path + ".temp", FileAttributes.Hidden);
int blockCount = ((int)fs.Length - 1) / encryptSize + 1;
for (int i = 0; i < blockCount; i++)
{
int size = encryptSize;
if (i == blockCount - 1) size = (int)(fs.Length - i * encryptSize);
byte[] bArr = new byte[size];
fs.Read(bArr, 0, size);
byte[] result = AES.AESEncrypt(bArr, pwd);
fsnew.Write(result, 0, result.Length);
fsnew.Flush();
refreshFileProgress(blockCount, i + 1); //更新进度
}
fsnew.Close();
fsnew.Dispose();
}
fs.Close();
fs.Dispose();
FileAttributes fileAttr = File.GetAttributes(path);
File.SetAttributes(path, FileAttributes.Archive);
File.Delete(path);
File.Move(path + ".temp", path);
File.SetAttributes(path, fileAttr);
}
}
}
catch (Exception ex)
{
File.Delete(path + ".temp");
throw ex;
}
}
#endregion
#region 解密文件
/// <summary>
/// 解密文件
/// </summary>
public static void DecryptFile(string path, string pwd, RefreshFileProgress refreshFileProgress)
{
try
{
if (File.Exists(path + ".temp")) File.Delete(path + ".temp");
using (FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read))
{
if (fs.Length > 0)
{
using (FileStream fsnew = new FileStream(path + ".temp", FileMode.OpenOrCreate, FileAccess.Write))
{
if (File.Exists(path + ".temp")) File.SetAttributes(path + ".temp", FileAttributes.Hidden);
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);
byte[] result = AES.AESDecrypt(bArr, pwd);
fsnew.Write(result, 0, result.Length);
fsnew.Flush();
refreshFileProgress(blockCount, i + 1); //更新进度
}
fsnew.Close();
fsnew.Dispose();
}
fs.Close();
fs.Dispose();
FileAttributes fileAttr = File.GetAttributes(path);
File.SetAttributes(path, FileAttributes.Archive);
File.Delete(path);
File.Move(path + ".temp", path);
File.SetAttributes(path, fileAttr);
}
}
}
catch (Exception ex)
{
File.Delete(path + ".temp");
throw ex;
}
}
#endregion
}
/// <summary>
/// 更新文件加密进度
/// </summary>
public delegate void RefreshFileProgress(int max, int value);
}
3、文件夹加密类
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using Utils;
namespace EncryptFile.Utils
{
/// <summary>
/// 文件夹加密类
/// </summary>
public class DirectoryEncrypt
{
#region 加密文件夹及其子文件夹中的所有文件
/// <summary>
/// 加密文件夹及其子文件夹中的所有文件
/// </summary>
public static void EncryptDirectory(string dirPath, string pwd, RefreshDirProgress refreshDirProgress, RefreshFileProgress refreshFileProgress)
{
string[] filePaths = Directory.GetFiles(dirPath, "*", SearchOption.AllDirectories);
for (int i = 0; i < filePaths.Length; i++)
{
FileEncrypt.EncryptFile(filePaths[i], pwd, refreshFileProgress);
refreshDirProgress(filePaths.Length, i + 1);
}
}
#endregion
#region 解密文件夹及其子文件夹中的所有文件
/// <summary>
/// 解密文件夹及其子文件夹中的所有文件
/// </summary>
public static void DecryptDirectory(string dirPath, string pwd, RefreshDirProgress refreshDirProgress, RefreshFileProgress refreshFileProgress)
{
string[] filePaths = Directory.GetFiles(dirPath, "*", SearchOption.AllDirectories);
for (int i = 0; i < filePaths.Length; i++)
{
FileEncrypt.DecryptFile(filePaths[i], pwd, refreshFileProgress);
refreshDirProgress(filePaths.Length, i + 1);
}
}
#endregion
}
/// <summary>
/// 更新文件夹加密进度
/// </summary>
public delegate void RefreshDirProgress(int max, int value);
}
4、跨线程访问控制委托
using System;
using System.Windows.Forms;
namespace Utils
{
/// <summary>
/// 跨线程访问控件的委托
/// </summary>
public delegate void InvokeDelegate();
/// <summary>
/// 跨线程访问控件类
/// </summary>
public class InvokeUtil
{
/// <summary>
/// 跨线程访问控件
/// </summary>
/// <param name="ctrl">Form对象</param>
/// <param name="de">委托</param>
public static void Invoke(Control ctrl, Delegate de)
{
if (ctrl.IsHandleCreated)
{
ctrl.BeginInvoke(de);
}
}
}
}
5、Form1.cs文件
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using Utils;
using System.Threading;
using EncryptFile.Utils;
namespace EncryptFile
{
public partial class Form1 : Form
{
#region 变量
/// <summary>
/// 一次处理的明文字节数
/// </summary>
public static int encryptSize = 10000000;
/// <summary>
/// 一次处理的密文字节数
/// </summary>
public static int decryptSize = 10000016;
#endregion
#region 构造函数
public Form1()
{
InitializeComponent();
}
#endregion
#region 加密文件
private void btnEncrypt_Click(object sender, EventArgs e)
{
#region 验证
if (txtPwd.Text == "")
{
MessageBox.Show("密码不能为空", "提示");
return;
}
if (txtPwdCfm.Text == "")
{
MessageBox.Show("确认密码不能为空", "提示");
return;
}
if (txtPwdCfm.Text != txtPwd.Text)
{
MessageBox.Show("两次输入的密码不相同", "提示");
return;
}
#endregion
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
Thread thread = new Thread(new ParameterizedThreadStart(delegate(object obj)
{
try
{
InvokeDelegate invokeDelegate = delegate()
{
pbFile.Value = 0;
lblProgressFile.Text = "0%";
pbDir.Visible = false;
lblProgressDir.Visible = false;
pbFile.Visible = false;
lblProgressFile.Visible = false;
lblShowPath.Text = "文件：" + openFileDialog1.FileName;
lblShowPath.Visible = true;
DisableBtns();
};
InvokeUtil.Invoke(this, invokeDelegate);
DateTime t1 = DateTime.Now;
FileEncrypt.EncryptFile(openFileDialog1.FileName, txtPwd.Text, RefreshFileProgress);
DateTime t2 = DateTime.Now;
string t = t2.Subtract(t1).TotalSeconds.ToString("0.00");
if (MessageBox.Show("加密成功，耗时" + t + "秒", "提示") == DialogResult.OK)
{
invokeDelegate = delegate()
{
EnableBtns();
};
InvokeUtil.Invoke(this, invokeDelegate);
}
}
catch (Exception ex)
{
if (MessageBox.Show("加密失败：" + ex.Message, "提示") == DialogResult.OK)
{
InvokeDelegate invokeDelegate = delegate()
{
EnableBtns();
};
InvokeUtil.Invoke(this, invokeDelegate);
}
}
}));
thread.Start();
}
}
#endregion
#region 解密文件
private void btnDecrypt_Click(object sender, EventArgs e)
{
#region 验证
if (txtPwd.Text == "")
{
MessageBox.Show("密码不能为空", "提示");
return;
}
#endregion
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
Thread thread = new Thread(new ParameterizedThreadStart(delegate(object obj)
{
try
{
InvokeDelegate invokeDelegate = delegate()
{
pbFile.Value = 0;
lblProgressFile.Text = "0%";
pbDir.Visible = false;
lblProgressDir.Visible = false;
pbFile.Visible = false;
lblProgressFile.Visible = false;
lblShowPath.Text = "文件：" + openFileDialog1.FileName;
lblShowPath.Visible = true;
DisableBtns();
};
InvokeUtil.Invoke(this, invokeDelegate);
DateTime t1 = DateTime.Now;
FileEncrypt.DecryptFile(openFileDialog1.FileName, txtPwd.Text, RefreshFileProgress);
DateTime t2 = DateTime.Now;
string t = t2.Subtract(t1).TotalSeconds.ToString("0.00");
if (MessageBox.Show("解密成功，耗时" + t + "秒", "提示") == DialogResult.OK)
{
invokeDelegate = delegate()
{
EnableBtns();
};
InvokeUtil.Invoke(this, invokeDelegate);
}
}
catch (Exception ex)
{
if (MessageBox.Show("解密失败：" + ex.Message, "提示") == DialogResult.OK)
{
InvokeDelegate invokeDelegate = delegate()
{
EnableBtns();
};
InvokeUtil.Invoke(this, invokeDelegate);
}
}
}));
thread.Start();
}
}
#endregion
#region 文件夹加密
private void btnEncryptDir_Click(object sender, EventArgs e)
{
#region 验证
if (txtPwd.Text == "")
{
MessageBox.Show("密码不能为空", "提示");
return;
}
if (txtPwdCfm.Text == "")
{
MessageBox.Show("确认密码不能为空", "提示");
return;
}
if (txtPwdCfm.Text != txtPwd.Text)
{
MessageBox.Show("两次输入的密码不相同", "提示");
return;
}
#endregion
if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)
{
if (MessageBox.Show(string.Format("确定加密文件夹{0}？", folderBrowserDialog1.SelectedPath),
"提示", MessageBoxButtons.OKCancel) == DialogResult.Cancel)
{
return;
}
Thread thread = new Thread(new ParameterizedThreadStart(delegate(object obj)
{
try
{
InvokeDelegate invokeDelegate = delegate()
{
pbDir.Value = 0;
lblProgressDir.Text = "0%";
pbFile.Value = 0;
lblProgressFile.Text = "0%";
pbDir.Visible = true;
lblProgressDir.Visible = true;
pbFile.Visible = false;
lblProgressFile.Visible = false;
lblShowPath.Text = "文件夹：" + folderBrowserDialog1.SelectedPath;
lblShowPath.Visible = true;
DisableBtns();
};
InvokeUtil.Invoke(this, invokeDelegate);
DateTime t1 = DateTime.Now;
DirectoryEncrypt.EncryptDirectory(folderBrowserDialog1.SelectedPath, txtPwd.Text, RefreshDirProgress, RefreshFileProgress);
DateTime t2 = DateTime.Now;
string t = t2.Subtract(t1).TotalSeconds.ToString("0.00");
if (MessageBox.Show("加密成功，耗时" + t + "秒", "提示") == DialogResult.OK)
{
invokeDelegate = delegate()
{
EnableBtns();
};
InvokeUtil.Invoke(this, invokeDelegate);
}
}
catch (Exception ex)
{
if (MessageBox.Show("加密失败:" + ex.Message, "提示") == DialogResult.OK)
{
InvokeDelegate invokeDelegate = delegate()
{
EnableBtns();
};
InvokeUtil.Invoke(this, invokeDelegate);
}
}
}));
thread.Start();
}
}
#endregion
#region 文件夹解密
private void btnDecryptDir_Click(object sender, EventArgs e)
{
#region 验证
if (txtPwd.Text == "")
{
MessageBox.Show("密码不能为空", "提示");
return;
}
#endregion
if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)
{
if (MessageBox.Show(string.Format("确定解密文件夹{0}？", folderBrowserDialog1.SelectedPath),
"提示", MessageBoxButtons.OKCancel) == DialogResult.Cancel)
{
return;
}
Thread thread = new Thread(new ParameterizedThreadStart(delegate(object obj)
{
try
{
InvokeDelegate invokeDelegate = delegate()
{
pbDir.Value = 0;
lblProgressDir.Text = "0%";
pbFile.Value = 0;
lblProgressFile.Text = "0%";
pbDir.Visible = true;
lblProgressFile.Visible = true;
pbFile.Visible = false;
lblProgressFile.Visible = false;
lblShowPath.Text = "文件夹：" + folderBrowserDialog1.SelectedPath;
lblShowPath.Visible = true;
DisableBtns();
};
InvokeUtil.Invoke(this, invokeDelegate);
DateTime t1 = DateTime.Now;
DirectoryEncrypt.DecryptDirectory(folderBrowserDialog1.SelectedPath, txtPwd.Text, RefreshDirProgress, RefreshFileProgress);
DateTime t2 = DateTime.Now;
string t = t2.Subtract(t1).TotalSeconds.ToString("0.00");
if (MessageBox.Show("解密成功，耗时" + t + "秒", "提示") == DialogResult.OK)
{
invokeDelegate = delegate()
{
EnableBtns();
};
InvokeUtil.Invoke(this, invokeDelegate);
}
}
catch (Exception ex)
{
if (MessageBox.Show("解密失败：" + ex.Message, "提示") == DialogResult.OK)
{
InvokeDelegate invokeDelegate = delegate()
{
EnableBtns();
};
InvokeUtil.Invoke(this, invokeDelegate);
}
}
}));
thread.Start();
}
}
#endregion
#region 更新文件加密进度
/// <summary>
/// 更新文件加密进度
/// </summary>
public void RefreshFileProgress(int max, int value)
{
InvokeDelegate invokeDelegate = delegate()
{
if (max > 1)
{
pbFile.Visible = true;
lblProgressFile.Visible = true;
}
else
{
pbFile.Visible = false;
lblProgressFile.Visible = false;
}
pbFile.Maximum = max;
pbFile.Value = value;
lblProgressFile.Text = value * 100 / max + "%";
};
InvokeUtil.Invoke(this, invokeDelegate);
}
#endregion
#region 更新文件夹加密进度
/// <summary>
/// 更新文件夹加密进度
/// </summary>
public void RefreshDirProgress(int max, int value)
{
InvokeDelegate invokeDelegate = delegate()
{
pbDir.Maximum = max;
pbDir.Value = value;
lblProgressDir.Text = value * 100 / max + "%";
};
InvokeUtil.Invoke(this, invokeDelegate);
}
#endregion
#region 显示密码
private void cbxShowPwd_CheckedChanged(object sender, EventArgs e)
{
if (cbxShowPwd.Checked)
{
txtPwd.PasswordChar = default(char);
txtPwdCfm.PasswordChar = default(char);
}
else
{
txtPwd.PasswordChar = '*';
txtPwdCfm.PasswordChar = '*';
}
}
#endregion
#region 关闭窗体事件
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
if (progressPanel.Visible)
{
MessageBox.Show("正在处理文件，请等待…", "提示");
e.Cancel = true;
}
}
#endregion
#region 控制按钮状态
/// <summary>
/// 禁用按钮
/// </summary>
public void DisableBtns()
{
progressPanel.Visible = true;
btnEncrypt.Enabled = false;
btnDecrypt.Enabled = false;
btnEncryptDir.Enabled = false;
btnDecryptDir.Enabled = false;
}
/// <summary>
/// 启用按钮
/// </summary>
public void EnableBtns()
{
lblShowPath.Visible = false;
progressPanel.Visible = false;
btnEncrypt.Enabled = true;
btnDecrypt.Enabled = true;
btnEncryptDir.Enabled = true;
btnDecryptDir.Enabled = true;
}
#endregion
}
}
完整实例代码点击此处本站下载。
希望本文所述对大家的C#程序设计有所帮助。
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AES简介 AES(The Advanced Encryption Standard)是美国国家标准与技术研究所用于加密电子数据的规范.它被预期能成为人们公认的加密包括金融.电信和政府数字信息的方法. AES 是一个新的可以用于保护电子数据的加密算法.明确地说,AES 是一个迭代的.对称密钥分组的密码,它可以使用128.192 和 256 位密钥,并且用 128 位(16字节)分组加密和解密数据.与公共密钥密码使用密钥对不同,对称密钥密码使用相同的密钥加密和解密数据.通过分组密码返回的加密数据
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C#的3DES加密解密算法实例代码
C#类如下: 复制代码 代码如下: using System;using System.Collections.Generic;using System.Text;using System.Security.Cryptography;using System.IO; namespace ConsoleApplication1{ /// <summary> /// 加解密类 /// </summary> public class EncryptHelper
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C#编写的Base64加密和解密类
这个C#类是一个基于Base64的加密和解密类,用户可以可以使用默认的秘钥进行加密.解密,也可以自己设定秘钥进行加密和解密,非常实用 代码一:非常精简的代码 /// <summary> /// Base64加密,解密方法 /// </summary> /// <paramname="s">输入字符串</param> /// <paramname="c">true-加密,false-解密</param&
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基于C#对用户密码使用MD5加密与解密
C#中常涉及到对用户密码的加密于解密的算法,其中使用MD5加密是最常见的的实现方式.本文总结了通用的算法并结合了自己的一点小经验,分享给大家. 一.使用16位.32位.64位MD5方法对用户名加密 1)16位的MD5加密 /// <summary> /// 16位MD5加密 /// </summary> /// <param name="password"></param> /// <returns></returns&
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C#常用字符串加密解密方法封装代码
复制代码 代码如下: //方法一//须添加对System.Web的引用//using System.Web.Security;/// <summary>/// SHA1加密字符串/// </summary>/// <param name="source">源字符串</param>/// <returns>加密后的字符串</returns>public string SHA1(string source){ r
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基于私钥加密公钥解密的RSA算法C#实现方法
本文实例讲述了基于私钥加密公钥解密的RSA算法C#实现方法,是一种应用十分广泛的算法.分享给大家供大家参考之用.具体方法如下: 一.概述 RSA算法是第一个能同时用于加密和数字签名的算法,也易于理解和操作. RSA是被研究得最广泛的公钥算法,从提出到现在已近二十年,经历了各种攻击的考验,逐渐为人们接受,普遍认为是目前最优秀的公钥方案之一.RSA的安全性依赖于大数的因子分解,但并没有从理论上证明破译RSA的难度与大数分解难度等价. RSA的安全性依赖于大数分解.公钥和私钥都是两个大素数( 大于 1
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c#多种加解密示例(md5加密解密)
复制代码 代码如下: using System;using System.Collections.Generic;using System.Globalization;using System.IO;using System.Security.Cryptography;using System.Text; /// <summary>/// 加解密/// </summary>public static class CryptHelper{ #region RSA加密 /// &
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C# RSA分段加解密实现方法详解
本文实例讲述了C# RSA分段加解密实现方法.分享给大家供大家参考,具体如下: RSA加解密: 1024位的证书,加密时最大支持117个字节,解密时为128: 2048位的证书,加密时最大支持245个字节,解密时为256. 加密时支持的最大字节数:证书位数/8 -11(比如:2048位的证书,支持的最大加密字节数:2048/8 - 11 = 245) .NET中的RSA加密算法为了提高安全性,在待加密数据前要添加一些随机数,因此,使用.NET中的RSA加密算法一次最多加密117字节数据(多于11