PKCS7 Encrypt MIME

Encrypt MIME using a digital certificate to create PKCS7 encrypted S/MIME.

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Dim mime As New Chilkat.Mime()

Dim success As Boolean
success = mime.UnlockComponent("Anything for 30-day trial.")
If (success = false) Then
    TextBox1.Text = TextBox1.Text & mime.LastErrorText & vbCrLf
    Exit Sub
End If


'  Build a simple MIME message to be encrypted:
mime.AddHeaderField("Content-Type","text/plain")
mime.AddHeaderField("abc","123")
mime.SetBody("This is a test")

'  A digital certificate is required to create PKCS7 encrypted MIME.
'  It can come from a variety of sources: .cer file, .pfx file, PEM files,
'  an in-memory representation, or directly from a Windows
'  registry-based certificate store.

'  This example will load a certificate object from a .cer file.
'  Note: Only the public-key is required to encrypt.  (Decryption
'  requires a private key.)

Dim cert As New Chilkat.Cert()
success = cert.LoadFromFile("myCert.cer")
If (success = false) Then
    TextBox1.Text = TextBox1.Text & cert.LastErrorText & vbCrLf
    Exit Sub
End If


'  Encrypt the MIME:
success = mime.Encrypt(cert)
If (success = false) Then
    TextBox1.Text = TextBox1.Text & mime.LastErrorText & vbCrLf
    Exit Sub
End If


'  Display the MIME:
TextBox1.Text = TextBox1.Text & mime.GetMime() & vbCrLf

'  The resulting S/MIME looks something like this:
'  
abc: 123
Content-Disposition: attachment; filename="smime.p7m"
Content-Transfer-Encoding: base64
Content-Type: application/x-pkcs7-mime;
 name="smime.p7m"

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