解密和下载我在C＃中使用AES加密的文件时出现问题

本文介绍了解密和下载我在C＃中使用AES加密的文件时出现问题的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

protected void Button1_Click(object sender, EventArgs e) { string filename = DropDownList1.SelectedItem.Value; string filePath = Path.Combine(Server.MapPath("~/cloudfiles"), filename); // key for decryption byte[] Key = Encoding.UTF8.GetBytes("asdf!@#$1234ASDF"); //UnicodeEncoding ue = new UnicodeEncoding(); FileStream fs = new FileStream(filePath, FileMode.Open); AesManaged rmCryp = new AesManaged(); CryptoStream cs = new CryptoStream(fs, rmCryp.CreateDecryptor(Key, Key), CryptoStreamMode.Read); try { // Decrypt & Download Here Response.Clear(); Response.ContentType = "application/octet-stream"; // Response.AddHeader("Content-Disposition","attachment; filename=" + Path.GetFileName(filePath) + Path.GetExtension(filePath)); Response.AddHeader("Content-Disposition", "attachment; filename=myfile" + Path.GetExtension(filePath)); int data; while ((data = cs.ReadByte()) != -1) { Response.OutputStream.WriteByte((byte)data); Response.Flush(); } cs.Close(); fs.Close(); } catch (Exception ex) { Response.Write(ex.Message); } finally { cs.Close(); fs.Close(); } }

我尝试了什么：

What I have tried:

Hi all For my research work im doing about a access control model and it uses AES symmetric key encryption for encrypting the file while uploading and decryption while downloading.As im a newbie i have used a available algorithm and when im downloading file it is larger than original file and it has a content of the web page also.As an example if i encrypt text file when im downloading it embedded with web page content.can any one help me with that ? here is my code for file decryption.

推荐答案

1234ASDF）; // UnicodeEncoding ue = new UnicodeEncoding（）; FileStream fs = new FileStream（filePath，FileMode.Open）; AesManaged rmCryp = new AesManaged（）; CryptoStream cs = new CryptoStream（fs，rmCryp.CreateDecryptor（Key） ，Key），CryptoStreamMode.Read）; try { // Decrypt& Download Here Response.Clear（）; Response.ContentType =application / octet-stream; // Response.AddHeader（Content-Disposition，attachment; filename =+ Path.GetFileName（filePath）+ Path.GetExtension（filePath））; 响应。 AddHeader（Content-Disposition，attachment; filename = myfile+ Path.GetExtension（filePath））; int data; while（（data = cs.ReadByte（））！= -1 ） { Response.OutputStream.WriteByte（（字节）的数据）; Response.Flush（）; } cs.Close（）; fs.Close（）; } catch（Exception ex） { Response.Write（ex.Message）; } 最后 { cs.Close（）; fs.Close（）; } } 1234ASDF"); //UnicodeEncoding ue = new UnicodeEncoding(); FileStream fs = new FileStream(filePath, FileMode.Open); AesManaged rmCryp = new AesManaged(); CryptoStream cs = new CryptoStream(fs, rmCryp.CreateDecryptor(Key, Key), CryptoStreamMode.Read); try { // Decrypt & Download Here Response.Clear(); Response.ContentType = "application/octet-stream"; // Response.AddHeader("Content-Disposition","attachment; filename=" + Path.GetFileName(filePath) + Path.GetExtension(filePath)); Response.AddHeader("Content-Disposition", "attachment; filename=myfile" + Path.GetExtension(filePath)); int data; while ((data = cs.ReadByte()) != -1) { Response.OutputStream.WriteByte((byte)data); Response.Flush(); } cs.Close(); fs.Close(); } catch (Exception ex) { Response.Write(ex.Message); } finally { cs.Close(); fs.Close(); } }

我尝试了什么：

What I have tried:

Hi all For my research work im doing about a access control model and it uses AES symmetric key encryption for encrypting the file while uploading and decryption while downloading.As im a newbie i have used a available algorithm and when im downloading file it is larger than original file and it has a content of the web page also.As an example if i encrypt text file when im downloading it embedded with web page content.can any one help me with that ? here is my code for file decryption.