CODEWITHSUNDEEP
c#serializationencryption
user3350005
user3350005

Reputation: 1

Serializing to memory and then encrypting

Object p=new Object();
//stream-this is the stream to the file.

using (MemoryStream ms = new MemoryStream())
{
     BinaryFormatter msSeri = new BinaryFormatter();
     msSeri.Serialize(ms, p);

     DESCryptoServiceProvider cryptic = new DESCryptoServiceProvider();
     cryptic.Key = ASCIIEncoding.ASCII.GetBytes("ABCDEFGH");
     cryptic.IV = ASCIIEncoding.ASCII.GetBytes("ABCDEFGH");       
     CryptoStream crStream = new                        
     CryptoStream(ms,cryptic.CreateEncryptor(),CryptoStreamMode.Write);
     byte[] data = ASCIIEncoding.ASCII.GetBytes(ms.ToString());
     crStream.Write(data,0,data.Length);
     crStream.Close();
     BinaryFormatter seri = new BinaryFormatter();
     if (stream != null)
         seri.Serialize(stream, seri.Deserialize(crStream));
}

I need to serialize to file only the encrypted data,so i've tried to serialize to memory first,then encrypt,then serialize to file. i got Argument exception in this line-

seri.Serialize(stream, seri.Deserialize(crStream));

i'm new at this,any help will be welcomed. i dont know if how i did it is even correct,i used examples i found all over the web.

Upvotes: 0

Views: 336

Answers (1)

demonplus
demonplus

Reputation: 5801

        string path = "D:\\changeit.txt";
        Object p = new Object();

        using (Stream stream = File.Create(path))
        {           
            DESCryptoServiceProvider cryptic = new DESCryptoServiceProvider();
            cryptic.Key = ASCIIEncoding.ASCII.GetBytes("ABCDEFGH");
            cryptic.IV = ASCIIEncoding.ASCII.GetBytes("ABCDEFGH");
            using (CryptoStream crStream = new
                  CryptoStream(stream, cryptic.CreateEncryptor(), CryptoStreamMode.Write))
            {
                byte[] data = ASCIIEncoding.ASCII.GetBytes(stream.ToString());
                crStream.Write(data, 0, data.Length);

                BinaryFormatter seri = new BinaryFormatter();
                seri.Serialize(crStream, p);
            }
        }

Basically you need one FileStream and one CryptoStream. And use using(), no close().

Example for deserializing:

        using (Stream readStream = File.OpenRead(path))
        {
            DESCryptoServiceProvider cryptic = new DESCryptoServiceProvider();
            cryptic.Key = ASCIIEncoding.ASCII.GetBytes("ABCDEFGH");
            cryptic.IV = ASCIIEncoding.ASCII.GetBytes("ABCDEFGH");
            using (CryptoStream crStream = 
                new CryptoStream(readStream, cryptic.CreateDecryptor(), CryptoStreamMode.Read))
            {
                byte[] data = ASCIIEncoding.ASCII.GetBytes(readStream.ToString());
                crStream.Read(data, 0, data.Length);

                BinaryFormatter formatter = new BinaryFormatter();
                object obj = formatter.Deserialize(crStream);                    
            }
        }

Upvotes: 1

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