/// <summary> /// 加密文件 /// </summary> /// <param name="inFile">待加密文件</param> /// <param name="outFile">加密后输入文件</param> /// <param name="password">加密密码</param> public static void EncryptFile(string inFile, string outFile, string password) { using (FileStream fin = File.OpenRead(inFile), fout = File.OpenWrite(outFile)) { long lSize = fin.Length; // 输入文件长度 int size = (int)lSize; byte[] bytes = new byte[BUFFER_SIZE]; // 缓存 int read = -1; // 输入文件读取数量 int value = 0; // 获取IV和salt byte[] IV = GenerateRandomBytes(16); byte[] salt = GenerateRandomBytes(16); // 创建加密对象 SymmetricAlgorithm sma = DESFile.CreateRijndael(password, salt); sma.IV = IV; // 在输出文件开始部分写入IV和salt fout.Write(IV, 0, IV.Length); fout.Write(salt, 0, salt.Length); // 创建散列加密 HashAlgorithm hasher = SHA256.Create(); using (CryptoStream cout = new CryptoStream(fout, sma.CreateEncryptor(), CryptoStreamMode.Write), chash = new CryptoStream(Stream.Null, hasher, CryptoStreamMode.Write)) { BinaryWriter bw = new BinaryWriter(cout); bw.Write(lSize); bw.Write(FC_TAG); // 读写字节块到加密流缓冲区 while ((read = fin.Read(bytes, 0, bytes.Length)) != 0) { cout.Write(bytes, 0, read); chash.Write(bytes, 0, read); value += read; } // 关闭加密流 chash.Flush(); chash.Close(); // 读取散列 byte[] hash = hasher.Hash; // 输入文件写入散列 cout.Write(hash, 0, hash.Length); // 关闭文件流 cout.Flush(); cout.Close(); } } }
private void btnEncrypt_Click(object sender, EventArgs e) { if (string.IsNullOrEmpty(txtFile.Text.Trim())) { return; } if (string.IsNullOrEmpty(txtPassword.Text.Trim())) { return; } if (chkFolder.Checked) { DialogResult dr = MessageBox.Show("Are u sure to encrypt the folder all files?", "Quesstion", MessageBoxButtons.YesNo, MessageBoxIcon.Question); if (dr == DialogResult.No) { return; } DirectoryInfo di = new DirectoryInfo(txtFile.Text.Trim()); foreach (FileInfo fi in di.GetFiles()) { string inFile = fi.FullName; string outFile = inFile + ".edward"; string password = txtPassword.Text; DESFile.EncryptFile(inFile, outFile, password);//加密文件 //删除加密前的文件 File.Delete(inFile); } } else { string inFile = txtFile.Text; string outFile = inFile + ".edward"; string password = txtPassword.Text; DESFile.EncryptFile(inFile, outFile, password);//加密文件 //删除加密前的文件 File.Delete(inFile); } txtFile.Text = string.Empty; txtPassword.Text = string.Empty; MessageBox.Show("加密成功"); }
/// <summary> /// 解密文件 /// </summary> /// <param name="inFile">待解密文件</param> /// <param name="outFile">解密后输出文件</param> /// <param name="password">解密密码</param> public static void DecryptFile(string inFile, string outFile, string password) { // 创建打开文件流 using (FileStream fin = File.OpenRead(inFile), fout = File.OpenWrite(outFile)) { int size = (int)fin.Length; byte[] bytes = new byte[BUFFER_SIZE]; int read = -1; int value = 0; int outValue = 0; byte[] IV = new byte[16]; fin.Read(IV, 0, 16); byte[] salt = new byte[16]; fin.Read(salt, 0, 16); SymmetricAlgorithm sma = DESFile.CreateRijndael(password, salt); sma.IV = IV; value = 32; long lSize = -1; // 创建散列对象, 校验文件 HashAlgorithm hasher = SHA256.Create(); using (CryptoStream cin = new CryptoStream(fin, sma.CreateDecryptor(), CryptoStreamMode.Read), chash = new CryptoStream(Stream.Null, hasher, CryptoStreamMode.Write)) { // 读取文件长度 BinaryReader br = new BinaryReader(cin); lSize = br.ReadInt64(); ulong tag = br.ReadUInt64(); if (FC_TAG != tag) { throw new CryptoHelpException("文件被破坏"); } long numReads = lSize / BUFFER_SIZE; long slack = (long)lSize % BUFFER_SIZE; for (int i = 0; i < numReads; ++i) { read = cin.Read(bytes, 0, bytes.Length); fout.Write(bytes, 0, read); chash.Write(bytes, 0, read); value += read; outValue += read; } if (slack > 0) { read = cin.Read(bytes, 0, (int)slack); fout.Write(bytes, 0, read); chash.Write(bytes, 0, read); value += read; outValue += read; } chash.Flush(); chash.Close(); fout.Flush(); fout.Close(); byte[] curHash = hasher.Hash; // 获取比较和旧的散列对象 byte[] oldHash = new byte[hasher.HashSize / 8]; read = cin.Read(oldHash, 0, oldHash.Length); if ((oldHash.Length != read) || (!CheckByteArrays(oldHash, curHash))) { throw new CryptoHelpException("文件被破坏"); } } if (outValue != lSize) { throw new CryptoHelpException("文件大小不匹配"); } } }
private void btnDecrypt_Click(object sender, EventArgs e) { if (string.IsNullOrEmpty(txtFile.Text.Trim())) { return; } if (string.IsNullOrEmpty(txtPassword.Text.Trim())) { return; } if (chkFolder.Checked) { DialogResult dr = MessageBox.Show("Are u sure to dencrypt the folder all files?", "Quesstion", MessageBoxButtons.YesNo, MessageBoxIcon.Question); if (dr == DialogResult.No) { return; } DirectoryInfo di = new DirectoryInfo(txtFile.Text.Trim()); foreach (FileInfo fi in di.GetFiles()) { if (fi.Extension != ".edward") { continue; } string inFile = fi.FullName; string outFile = inFile.Substring(0, inFile.LastIndexOf('.') + 1); string password = txtPassword.Text; if (File.Exists(outFile)) { try { File.Delete(outFile); } catch (Exception) { } } DESFile.DecryptFile(inFile, outFile, password); //解密文件 //删除解密前的文件 File.Delete(inFile); } } else { FileInfo fi = new FileInfo(txtFile.Text.Trim()); if (fi.Extension != ".edward") { MessageBox.Show("make sure the file extension is '.edawrd'", "Extension not match", MessageBoxButtons.OK, MessageBoxIcon.Exclamation); return; } string inFile = txtFile.Text; string outFile = inFile.Substring(0, inFile.LastIndexOf('.') + 1); string password = txtPassword.Text; if (File.Exists(outFile)) { try { File.Delete(outFile); } catch (Exception) { } } DESFile.DecryptFile(inFile, outFile, password);//解密文件 //删除解密前的文件 File.Delete(inFile); } txtFile.Text = string.Empty; txtPassword.Text = string.Empty; MessageBox.Show("解密成功"); }