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POS/Mime Encrypting a string
 

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    <p>I have been tasked with encrypting a string using S/Mime encryption. Eons ago, the firm I work for bought a component for this (from IPWorks) but we have had untold bundles of grief getting their component to play nicely on our servers. Not a functionality issue, more licensing.</p> <p>So in short, I must do it myself. I have trawled the MSDN and forums and put together the following code. Unfortunately the output it creates is not what I expect. Lots of Korean and special characters that I would not expect.</p> <pre><code>public string EncryptString(string toEncrypt, string key) { // Convert the body to bytes byte[] bodyBytes = Encoding.ASCII.GetBytes(toEncrypt); // Encrypt the body var envelopedCms = new EnvelopedCms(new ContentInfo(bodyBytes)); var certificate = new X509Certificate2(Encoding.ASCII.GetBytes(key)); var recipient = new CmsRecipient(certificate); envelopedCms.Encrypt(recipient); byte[] encryptedBytes = envelopedCms.Encode(); var msg = new MailMessage(); var ms = new MemoryStream(encryptedBytes); var av = new AlternateView(ms, "application/pkcs7-mime; smime-type=enveloped-data;name=smime.p7m; content-transfer-encoding=Base64; content-disposition=attachment; fileName=smime.p7m;"); msg.AlternateViews.Add(av); return new StreamReader(msg.AlternateViews[0].ContentStream).ReadToEnd(); } </code></pre> <p>Can anyone see an obvious blunder here?</p> <p>I am not "married" to this code so if you have an alternate suggestion to how I might do this fire away.</p> <p>Kindness and thanks,</p> <p>Dan</p>
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    1. CODon't passing a byte[] into the X509 constructor try to parse the byte[] as a X509 certificate, is 'key' actually a certificate or are you trying to encrypt using an arbitrary string? Not sure if this might help: http://msdn.microsoft.com/en-us/library/ms180959.aspx
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    2. COThanks Laz, but yes it is a certificate read into a string
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    3. COI guess the other question is, can you decode the output from your encode routine?
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