C# MD5 加密

using System;

using System.Drawing;

using System.Security.Cryptography;

using System.Windows.Forms;
namespace WinFormMD5

{

    public partial class FormMD5 : Form

    {

        private MD5CryptoServiceProvider md5Hash;

        private MaskedTextBox maskedText;

        private TextBox textMD5;

        public FormMD5()

        {

            InitializeComponent();

            md5Hash = new MD5CryptoServiceProvider();

            maskedText = new MaskedTextBox();

            maskedText.Dock = DockStyle.Top;

            maskedText.TextAlign = HorizontalAlignment.Center;

            maskedText.ShortcutsEnabled = true;

            maskedText.KeyDown += new KeyEventHandler(maskedText_KeyDown);

            this.Controls.Add(maskedText);

            textMD5 = new TextBox();

            textMD5.Dock = DockStyle.Bottom;

            textMD5.TextAlign = HorizontalAlignment.Center;

            textMD5.ReadOnly = true;

            textMD5.ShortcutsEnabled = true;

            this.Controls.Add(textMD5);

            this.HelpButton = true;

            this.MaximizeBox = false;

            this.MinimizeBox = false;

            this.AutoScaleMode = AutoScaleMode.Font; // 根据字体的维度控制缩放。

            this.Font = new Font(Font.Name, 12F);

            this.ClientSize = new Size(192, 52);

            this.AutoSizeMode = AutoSizeMode.GrowAndShrink; // 禁用手动调整大小。

            this.SizeGripStyle = SizeGripStyle.Hide; // 隐藏调整大小手柄。

            this.StartPosition = FormStartPosition.CenterScreen; // 在桌面居中显示。

        }

        private void maskedText_KeyDown(object sender, KeyEventArgs e)

        {

            switch (e.KeyData)

            {

                case Keys.Enter:

                    byte[] pwdBytes = System.Text.Encoding.UTF8.GetBytes(maskedText.Text);

                    pwdBytes = md5Hash.ComputeHash(pwdBytes);

                    textMD5.Text = Convert.ToBase64String(pwdBytes).TrimEnd('='); // 无值字符“=”用于尾部的空白。

                    break;

                case (Keys.Control | Keys.L):

                    maskedText.TextAlign = HorizontalAlignment.Left; // 文本居左。

                    break;

                case (Keys.Control | Keys.E):

                    maskedText.TextAlign = HorizontalAlignment.Center; // 文本居中。

                    break;

                case (Keys.Control | Keys.R):

                    maskedText.TextAlign = HorizontalAlignment.Right; // 文本居右。

                    break;

            }

        }

        protected override void OnHelpButtonClicked(System.ComponentModel.CancelEventArgs e)

        {

            base.OnHelpButtonClicked(e);

            e.Cancel = true;

            using (FontDialog fontDialog = new FontDialog())

            {

                fontDialog.Font = this.Font;

                fontDialog.ShowEffects = false;

                if (fontDialog.ShowDialog(this) == DialogResult.OK)

                {

                    this.Font = fontDialog.Font;

                    int sw = TextRenderer.MeasureText(textMD5.Text, this.Font).Width;

                    this.ClientSize = new Size(sw, maskedText.Height + textMD5.Height);

                    Size ws = Screen.GetWorkingArea(this).Size - this.Size;

                    this.DesktopLocation = new Point(ws.Width / 2, ws.Height / 2);

                }

            }

        }

    }

}