Hi,

i've got problems with CryptoStream and GZipStream. Someone tried that? Or
got any idea why this wont work?

i tried every combination, first i used CryptoStream, after that GZipStream.
Or first i create a file with GZipStream and crypt that file. But become back
the orginal is impossible...

I hope anyone got an idea how this could work.

Thanks

Martin

They should work fine together... just make sure you gzip first, then
encrypt (encrypted data doesn't compress). What error (etc) did you
see?

Marc

Like so:

Rijndael r = Rijndael.Create();
Console.WriteLine("IV: " + r.IV);
Console.WriteLine("Key: " + r.Key);
using(FileStream raw = File.Create("foo.bar"))
using(CryptoStream cs = new CryptoStream(raw,
r.CreateEncryptor(), CryptoStreamMode.Write))
using(GZipStream gzip = new GZipStream(cs,
CompressionMode.Compress))
using(StreamWriter writer = new StreamWriter(gzip)) {
for(int i = 0 ; i < 100 ; i++) {
writer.WriteLine("Line {0} - blah blah blah blah",
i);
}
writer.Close();
gzip.Close();
cs.Close();
raw.Close();
}

Console.WriteLine("Size: " + new
FileInfo("foo.bar").Length);

using(FileStream raw = File.OpenRead("foo.bar"))
using(CryptoStream cs = new CryptoStream(raw,
r.CreateDecryptor(), CryptoStreamMode.Read))
using(GZipStream gzip = new GZipStream(cs,
CompressionMode.Decompress))
using (StreamReader reader = new StreamReader(gzip))
{
string line;
while((line = reader.ReadLine()) != null) {
Console.WriteLine(line);
}
}