Decrypting gzip file


I am fetching an XML file form an external source which is encrypted using gzip, in my application

How can I decrypt it and extract the XMP out of it to parse it.

I am using .NET 3.5 with C#
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You could try to use ZLib through a C++ DLL called from your .Net assembly :

Or, probably could you do it in 2 step:
1. unzip with System.IO.Compression.GZipStream class
2. decrypt using System.Security.Cryptography.RijndaelManaged class

I'm not 100% sure the second solution would work (let's give a try) but the first will in any cases.
Decompression can be performed by either GZipStream or DeflateStream classes depending on the format of compressed data.
As for extracting XMP you could load xml in XmlDocument and use SelectSingleNode() with XPath expression to find this node.
Amandeep Singh BhullarCommented:

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Wait a minute, I thought we were talking about files encrypted with gzip and not only compressed. Else of course, it is far more easier.
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