VB.NET

Check if a MIME Entity is Encrypted (S/MIME)

Demonstrates the Chilkat Mime.IsEncrypted method, which returns whether the entity is a CMS/PKCS #7 encrypted S/MIME wrapper. It takes no arguments.

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own file.

Background: This tells you a message is encrypted and must be decrypted before its real content is available — the trigger for supplying a recipient certificate and private key to Decrypt. Reading the body without decrypting first would just yield the opaque PKCS #7 blob.

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VB.NET

Dim success As Boolean = False

'  Demonstrates the Mime.IsEncrypted method, which returns whether the entity is a CMS/PKCS #7 encrypted S/MIME wrapper.  It takes no arguments.

Dim mime As New Chilkat.Mime
success = mime.LoadMimeFile("qa_data/encrypted.eml")
If (success = False) Then
    Debug.WriteLine(mime.LastErrorText)
    Exit Sub
End If


If (mime.IsEncrypted()) Then
    Debug.WriteLine("This is an encrypted S/MIME message.")
Else
    Debug.WriteLine("This is not an encrypted S/MIME message.")
End If