Problem Decrypting Data

Hi,

I am a newbie to working with CryptLib and was wondering if someone could
help me figure out what I am doing wrong decrypting data. I've followed the
documentation very carefully and seem to be doing everything correct. But,
well, obviously I am not.

This is a simple password encryption using C# [1]. Pretty much the most
basic usage of the library, from what I can tell.

The one part I am not following to the letter is that I am calling the
cryptSetAttribute methods *before* I call cryptPushData.

But when I reverse those two calls, I get an error (and not the expected
error telling me I need a password, rather error -21 (No Permission to
Perform this Operation.))

Any help would be greatly appreciated. I've tried every variation of this
code that I can imagine. The full source of the entire (short, simple)
console application is here:
http://csharp.pastebin.com/m472c8e42


[1]
        static string DecryptData(string encodedData, string password)
        {
            byte[] envelopedData = StringToBytes(encodedData);
            int envelope = crypt.CreateEnvelope(crypt.UNUSED,
crypt.FORMAT_CRYPTLIB);
            crypt.SetAttribute(envelope, crypt.ENVINFO_DATASIZE,
envelopedData.Length);
            crypt.SetAttributeString(envelope, crypt.ENVINFO_PASSWORD,
password);
            int bytesCopied = 0;
            try
            {
                bytesCopied = crypt.PushData(envelope, envelopedData);
            }
            catch (CryptException cexc)
            {
                Console.WriteLine(cexc.ToString());
            }

            crypt.FlushData(envelope);
            byte[] messageBuffer = new byte[envelopedData.Length];
            bytesCopied = crypt.PopData(envelope, messageBuffer,
messageBuffer.Length);
            string unencryptedData =
ASCIIEncoding.ASCII.GetString(messageBuffer);
            crypt.DestroyEnvelope(envelope);
            return unencryptedData;
        }

--
Patrick Burrows

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