加密代码

最新推荐文章于 2025-05-22 17:15:34 发布

wangdetian168

最新推荐文章于 2025-05-22 17:15:34 发布

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CC 4.0 BY-SA版权

文章标签：加密 random string class byte c

本文链接：https://blog.youkuaiyun.com/wangdetian168/article/details/1660231

本文提供了一系列实用的C#代码片段，包括了字符串的MD5和SHA1加密方法，判断HTTP请求是否为文件上传请求的方法，以及生成验证码图片和随机字符串的功能。这些代码简洁高效，适用于多种应用场景。

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public static class Hash
{
  public static string md5(string s)
  {
   return FormsAuthentication.HashPasswordForStoringInConfigFile(s, "MD5").ToLower();
  }
  public static string sha1(string s)
  {
   return FormsAuthentication.HashPasswordForStoringInConfigFile(s, "SHA1").ToLower();
  }
}

public static class HTTP
{
  public static HttpWorkerRequest GetWokerRequest()
  {
   return (HttpContext.Current as IServiceProvider).GetService(typeof(HttpWorkerRequest)) as HttpWorkerRequest;
  }

  public static bool IsUploadRequest(HttpRequest r)
  {
   return r.ContentType.ToLower().StartsWith("multipart/form-data");
  }
}

public static class RandCodeBuilder
{
  public static byte[] BuildImage(string s)
  {
   Bitmap bm = new Bitmap(76, 24, PixelFormat.Format32bppArgb);
   Graphics g = Graphics.FromImage(bm);
   Random r = new Random();

   g.Clear(Color.White);
   /*
   for (int i = 0; i < 50; i++)
   {
    int x1 = r.Next(bm.Width);
    int x2 = r.Next(bm.Width);
    int y1 = r.Next(bm.Height);
    int y2 = r.Next(bm.Height);
    g.DrawLine(new Pen(Color.FromArgb(r.Next())), x1, y1, x2, y2);
   }
   */
   for (int i = 0; i < 200; i++)
   {
    int x = r.Next(bm.Width);
    int y = r.Next(bm.Height);
    bm.SetPixel(x, y, Color.Silver);
   }

   int j = r.Next(1, 4);
   Font f = new Font("Courier New", 14, FontStyle.Bold);
   LinearGradientBrush lgb = new LinearGradientBrush(new Rectangle(0, 0, 76, 24), Color.DarkGreen, Color.DarkSeaGreen, 1.2f, true);
   g.DrawString(s, f, lgb, 0, 0);
   //g.DrawRectangle(new Pen(Color.Silver), 0, 0, 70, 22);

   MemoryStream ms = new MemoryStream();
   bm.Save(ms, ImageFormat.Gif);
   return ms.ToArray();
  }
}

public static class Text
{
  private static char[] seeds = { '0','1','2','3','4','5','6','7','8','9', 'a','b','c','d','e','f','g','h','i','j', 'k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z' };

  public static string RandString(int len)
  {
   StringBuilder sb = new StringBuilder(36);
   Random r = new Random();
   for (int i = 0; i < len; i++)
   {
    sb.Append(seeds[r.Next(36)]);
   }
   return sb.ToString();
  }
}