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; &n