解密和下载我在C#中使用AES加密的文件时出现问题 [英] Problem while decrypt and downloading files that I encrypt using AES in C#
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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: < br $>
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: < br $>
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.
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