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I have an issue decrypting the message. I created a certificate using the following command. makecert -sk Mynewkey -n "CN=TestCert" test.cer -ss my -pe

Error at this following line. mime.GetPart(1) is null. Error message with LastErrorText is : Failed to get MIME message part

Here is my decryption code.

        Chilkat.Mime mime = new Chilkat.Mime();

        // Any string passed to UnlockComponent begins the 30-day trial
        mime.UnlockComponent("30-day trial");
        if (result != null)
        {
            mime.LoadMime(Encoding.UTF8.GetString(result.Body));
        }
        // Unwrap the security.  
        // The results are stored within the Mime object and can be queried
        // afterwards. 
        // The UnwrapSecurity does all decryption and signature validation,
        // regardless of how complex the MIME message may be.
        bool decryptSuccess = mime.UnwrapSecurity();

        if (decryptSuccess == false)
        {
            Console.WriteLine(mime.LastErrorText);
            return;
        }

        // Save the decrypted MIME message.
        mime.SaveMime("decrypted.txt");
        // (You can convert any MIME message to XML too.)
        mime.SaveXml("decrypted.xml");

        // Get the first encrypting certificate.
        // In complex cases where the MIME is nested and contains
        // other encrypted MIME messages, there will be more than
        // one encrypting certificate.
        Chilkat.Cert cert;
        cert = mime.GetEncryptCert(0);

        // This example uses a MIME message that included a GIF attachment.
        // Save the GIF to a file.
        Chilkat.Mime gifAttachment;
        gifAttachment = mime.GetPart(1);
        gifAttachment.SaveBody("sample.gif");

asked Dec 10 '12 at 15:43

nav100's gravatar image

nav100
16334


Look at the contents of the MIME after unwrapping the security layers (i.e. after calling UnwrapSecurity). Is the MIME multipart? If not, then obviously there are no sub-parts. If so, is there only 1 sub-part? The first sub-part is at index 0.

Also, make sure you understand the very basics of MIME -- such as: What is a multipart MIME message.

Also, to view the MIME, either save it to a file via the SaveMime method, or write it to a string via the GetMime method.

link

answered Dec 10 '12 at 15:50

chilkat's gravatar image

chilkat ♦♦
11.8k316358420

Thank you. It is multipart message. mime.GetPart(0) works. How can I extract message if there are multiple files? In this example I know this is .gif file. How can I find the file type and save it to disk? Could you please let me know.

(Dec 10 '12 at 17:24) nav100
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Asked: Dec 10 '12 at 15:43

Seen: 1,800 times

Last updated: Dec 10 '12 at 17:24

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