CryptoStream - GZipStream, Possible???

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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

[Marc Gravell]

Re: CryptoStream - GZipStream, Possible???

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

[Marc Gravell]

Re: CryptoStream - GZipStream, Possible???

Like so:

Rijndael r = Rijndael.Create ();
Console.WriteLi ne("IV: " + r.IV);
Console.WriteLi ne("Key: " + r.Key);
using(FileStrea m raw = File.Create("fo o.bar"))
using(CryptoStr eam cs = new CryptoStream(ra w,
r.CreateEncrypt or(), CryptoStreamMod e.Write))
using(GZipStrea m gzip = new GZipStream(cs,
CompressionMode .Compress))
using(StreamWri ter writer = new StreamWriter(gz ip)) {
for(int i = 0 ; i < 100 ; i++) {
writer.WriteLin e("Line {0} - blah blah blah blah",
i);
}
writer.Close();
gzip.Close();
cs.Close();
raw.Close();
}

Console.WriteLi ne("Size: " + new
FileInfo("foo.b ar").Length);

using(FileStrea m raw = File.OpenRead(" foo.bar"))
using(CryptoStr eam cs = new CryptoStream(ra w,
r.CreateDecrypt or(), CryptoStreamMod e.Read))
using(GZipStrea m gzip = new GZipStream(cs,
CompressionMode .Decompress))
using (StreamReader reader = new StreamReader(gz ip))
{
string line;
while((line = reader.ReadLine ()) != null) {
Console.WriteLi ne(line);
}
}