B4X

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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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 ChilkatMime
mime.Initialize
success = mime.LoadMimeFile("qa_data/encrypted.eml")
If success = False Then
    Log(mime.LastErrorText)
    Return
End If


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