Example #1
0
        /// <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))
            {
                byte [] bfilename = Encoding.Default.GetBytes(Path.GetFileName(inFile) + "\n");
                fout.Write(bfilename, 0, bfilename.Length);
                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 = CryptoHelp.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();
                }
            }
        }
Example #2
0
        private void btnStart_Click(object sender, EventArgs e)
        {
            if (this.txtFile.Text.Equals(""))
            {
                if (this.rbtnDecrypt.Checked)
                {
                    this.statusLblContext.Text = "请选择要解密的文件";
                }
                else
                {
                    this.statusLblContext.Text = "请选择要加密的文件";
                }
                return;
            }
            if (!(System.IO.File.Exists(this.txtFile.Text.Trim()) || System.IO.Directory.Exists(this.txtFile.Text.Trim())))
            {
                this.statusLblContext.Text = "你选择的文件或者目录不存在";
                return;
            }
            if (this.txtPwd.Text.Equals(""))
            {
                if (this.rbtnDecrypt.Checked)
                {
                    this.statusLblContext.Text = "请输入要解密的密码";
                }
                else
                {
                    this.statusLblContext.Text = "请输入要加密的密码";
                }
                return;
            }
            SaveFileDialog savefile = new SaveFileDialog();

            if (this.rbtnDecrypt.Checked)
            {
                string file = CryptoHelp.DecryptFileName(this.txtFile.Text.Trim());
                if ("" == file)
                {
                    file = "*";
                }
                savefile.Filter = string.Format("所有文件(*.{0})|*.{0}", System.IO.Path.GetExtension(file));
            }
            else
            {
                savefile.Filter = "密码文件(*.rg)|*.rg";
            }

            string path = "";

            if (savefile.ShowDialog() == DialogResult.OK)
            {
                path = savefile.FileName;
                Thread th = new Thread(new ThreadStart(Wait));
                th.Start();
                try
                {
                    if (this.rbtnDecrypt.Checked)
                    {
                        hotManager.CryptoHelp.DecryptFile(this.txtFile.Text, path, this.txtPwd.Text);
                    }
                    else
                    {
                        hotManager.CryptoHelp.EncryptFile(this.txtFile.Text, path, this.txtPwd.Text);
                    }
                    this.statusLblContext.Text = "操作完成";
                }
                catch
                {
                    this.statusLblContext.Text = "操作失败";
                }
                th.Abort();
            }
        }
Example #3
0
        /// <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;

                fin.Read(bytes, 0, 1024);
                string file = Encoding.Default.GetString(bytes);
                file = file.Remove(file.IndexOf("\n"));
                byte [] bytef = Encoding.Default.GetBytes(file + "\n");

                fin.Seek(bytef.Length, SeekOrigin.Begin);
                byte[] IV = new byte[16];
                fin.Read(IV, 0, 16);
                byte[] salt = new byte[16];
                fin.Read(salt, 0, 16);

                SymmetricAlgorithm sma = CryptoHelp.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");
                }
            }
        }