frmcrypto.cs

在设计程序时,需要经常计算一个字串的哈希值,得到加密文本,生成加密过的配置文件或都转换EXCEL文件到SQL数据库等等,根据自己习惯定制部分功能,由于时间关系,没有详细说明

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Security.Cryptography;
using System.IO;

namespace LingangTools
{
    public partial class FrmCrypto : Form
    {
        byte[] Key, IV;
        private bool isTextContent = true;

        public FrmCrypto()
        {
            InitializeComponent();
        }

        private void txt_GetKeyAndIv_Click(object sender, EventArgs e)
        {
            if (!string.IsNullOrEmpty(txt_Password.Text))
            {
                MD5 md5 = MD5.Create();
                Key = md5.ComputeHash(System.Text.Encoding.Default.GetBytes(txt_Password.Text));
                string textTransfered = txt_Password.Text + "lingang";
                IV = md5.ComputeHash(System.Text.Encoding.Default.GetBytes(textTransfered));

                System.Text.StringBuilder sb = new StringBuilder();
                for (int i = 0; i < Key.Length; i++)
                {
                    sb.Append(Key[i]);
                    if (i < Key.Length - 1)
                        sb.Append(",");
                }
                txt_Key.Text = sb.ToString();
                txt_KeyBase64.Text = System.Convert.ToBase64String(Key);

                sb = new StringBuilder();
                for (int i = 0; i < IV.Length; i++)
                {
                    sb.Append(IV[i]);
                    if (i < IV.Length - 1)
                        sb.Append(",");
                }
                txt_Iv.Text = sb.ToString();
                txt_IvBase64.Text = System.Convert.ToBase64String(IV);

                btn_Crypto.Enabled = true;
            }
            else
            {
                MessageBox.Show("初始密码不能为空，请输入密钥后再进行加密或生成密钥操作", "不能为空");
            }
        }

        private void btn_Crypto_Click(object sender, EventArgs e)
        {
            try
            {
                if (!string.IsNullOrEmpty(txt_PlainText.Text))
                {
                    Rijndael sa = Rijndael.Create();
                    sa.Key = Key;
                    sa.IV = IV;

                    if (isTextContent)
                    {
                        byte[] plainBytes = System.Text.Encoding.Default.GetBytes(txt_PlainText.Text);
                        System.IO.MemoryStream msOutput = new System.IO.MemoryStream();
                        CryptoStream cs = new CryptoStream(msOutput, sa.CreateEncryptor(), CryptoStreamMode.Write);

                        byte[] cryptoBytes;

                        try
                        {
                            cs.Write(plainBytes, 0, plainBytes.Length);
                            cs.Close();//必须关闭后才能读取
                            cryptoBytes = msOutput.ToArray();
                            System.Text.StringBuilder sb = new StringBuilder();
                            for (int i = 0; i < cryptoBytes.Length; i++)
                            {
                                sb.Append(cryptoBytes[i]);
                                if (i < cryptoBytes.Length - 1)
                                    sb.Append(",");
                            }
                            txt_BinaryCryptoText.Text = sb.ToString();
                            txt_Base64CryptoText.Text = System.Convert.ToBase64String(cryptoBytes);
                        }
                        catch (Exception ex)
                        {
                            MessageBox.Show(ex.Message);
                        }
                        finally
                        {
                            msOutput.Close();
                        }
                    }
                    else
                    {
                        if (System.IO.File.Exists(txt_PlainText.Text))
                        {
                            FileStream fsInput = new FileStream(txt_PlainText.Text, FileMode.Open);
                            BinaryReader brInput = new BinaryReader(fsInput);

                            string cryptoFileName = System.IO.Path.GetFileNameWithoutExtension(txt_PlainText.Text) + ".enc";
                            string cryptoFullFileName = System.IO.Path.GetDirectoryName(txt_PlainText.Text) + "\\" + cryptoFileName;

                            FileStream fsOutput = new FileStream(cryptoFullFileName, FileMode.Create);
                            CryptoStream cs = new CryptoStream(fsOutput, sa.CreateEncryptor(), CryptoStreamMode.Write);
                            BinaryWriter brOuput = new BinaryWriter(cs);

                            try
                            {
                                if (fsInput.Length < int.MaxValue)
                                {
                                    brOuput.Write(brInput.ReadBytes((int)fsInput.Length));
                                }
                                else
                                {
                                    long segment = fsInput.Length % int.MaxValue;
                                    long segmentLastLength = fsInput.Length - segment * int.MaxValue;
                                    for (long i = 0; i < segment; i++)
                                    {
                                        brOuput.Write(brInput.ReadBytes(int.MaxValue));
                                    }

                                    brOuput.Write(brInput.ReadBytes((int)segmentLastLength));
                                }
                                MessageBox.Show(string.Format("文件已经保存为：{0}", cryptoFileName), "加密成功");
                            }
                            catch (Exception ex)
                            {
                                MessageBox.Show(ex.Message);
                            }
                            finally
                            {
                                brOuput.Close();
                                cs.Close();
                                fsOutput.Close();
                                brInput.Close();
                                fsInput.Close();
                            }
                        }
                        else
                        {
                            MessageBox.Show("所选的文件不存在！", "文件不存在");
                        }
                    }
                }
                else
                {
                    MessageBox.Show("没有需要加密的内容，请输入内容或选择文件后，再进行加密操作！", "加密内容为空");
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void btn_CopyAsCode_Click(object sender, EventArgs e)
        {
            try
            {
                StringBuilder sb = new StringBuilder();
                sb.Append("byte [] Key ={").Append(txt_Key.Text).Append("};").Append(System.Environment.NewLine);
                sb.Append("byte [] IV ={").Append(txt_Iv.Text).Append("};").Append(System.Environment.NewLine);
                sb.Append("System.Security.Cryptography.Rijndael sa = System.Security.Cryptography.Rijndael.Create();").Append(System.Environment.NewLine);
                sb.Append("sa.Key = Key;").Append(System.Environment.NewLine);
                sb.Append("sa.IV = IV;").Append(System.Environment.NewLine);
                sb.Append("System.IO.MemoryStream ms = new System.IO.MemoryStream();").Append(System.Environment.NewLine);
                sb.Append("System.Security.Cryptography.CryptoStream cs = new System.Security.Cryptography.CryptoStream(ms, sa.CreateEncryptor(), CryptoStreamMode.Write);").Append(System.Environment.NewLine);
                sb.Append("byte [] plainBytes = new byte[]{11,11,11};").Append(System.Environment.NewLine);
                sb.Append("byte [] cryptoBytes;").Append(System.Environment.NewLine);
                sb.Append("try").Append(System.Environment.NewLine); ;
                sb.Append("{").Append(System.Environment.NewLine);
                sb.Append("    cs.Write(plainBytes, 0, plainBytes.Length);").Append(System.Environment.NewLine);
                sb.Append("    cs.Close();//必须关闭后才能读取").Append(System.Environment.NewLine);
                sb.Append("    cryptoBytes = ms.ToArray();").Append(System.Environment.NewLine);
                sb.Append("}").Append(System.Environment.NewLine);
                sb.Append("catch (Exception ex)").Append(System.Environment.NewLine);
                sb.Append("{").Append(System.Environment.NewLine);
                sb.Append("    throw ex;").Append(System.Environment.NewLine);
                sb.Append("}").Append(System.Environment.NewLine);
                sb.Append("finally").Append(System.Environment.NewLine);
                sb.Append("{").Append(System.Environment.NewLine);
                sb.Append("    ms.Close();").Append(System.Environment.NewLine);
                sb.Append("}");
                FrmTextBox frm = new FrmTextBox();
                frm.MyText = sb.ToString();
                frm.ShowDialog();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void txt_Base64CryptoText_DoubleClick(object sender, EventArgs e)
        {
            Clipboard.SetText(txt_Base64CryptoText.Text);
        }

        private void txt_BinaryCryptoText_DoubleClick(object sender, EventArgs e)
        {
            Clipboard.SetText(txt_BinaryCryptoText.Text);
        }

        private void radioButton_Text_CheckedChanged(object sender, EventArgs e)
        {
            isTextContent = radioButton_Text.Checked;
            btn_OpenFile.Enabled = !isTextContent;
        }

        private void btn_OpenFile_Click(object sender, EventArgs e)
        {
            if (ofd_OpenFile.ShowDialog() == DialogResult.OK)
            {
                txt_PlainText.Text = ofd_OpenFile.FileName;
            }
        }
    }
}