Encrypt MIME for Multiple Recipients

See more MIME Examples

Demonstrates encrypting the current MIME entity for several recipients at once. A certificate is added for each recipient with AddEncryptCert, and EncryptN then produces a single CMS/PKCS #7 message that each recipient can independently decrypt.

The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Dim success As Long
success = 0

Dim mime As New ChilkatMime
success = mime.SetBodyFromPlainText("This message will be encrypted.")
If (success = 0) Then
    Debug.Print mime.LastErrorText
    Exit Sub
End If

'  Add a certificate for each intended recipient.  Every recipient receives an independently
'  wrapped copy of the message key.
Dim cert1 As New ChilkatCert
success = cert1.LoadFromFile("qa_data/recipient1.cer")
If (success = 0) Then
    Debug.Print cert1.LastErrorText
    Exit Sub
End If

success = mime.AddEncryptCert(cert1)
If (success = 0) Then
    Debug.Print mime.LastErrorText
    Exit Sub
End If

Dim cert2 As New ChilkatCert
success = cert2.LoadFromFile("qa_data/recipient2.cer")
If (success = 0) Then
    Debug.Print cert2.LastErrorText
    Exit Sub
End If

success = mime.AddEncryptCert(cert2)
If (success = 0) Then
    Debug.Print mime.LastErrorText
    Exit Sub
End If

'  Encrypt for every added recipient at once.
success = mime.EncryptN()
If (success = 0) Then
    Debug.Print mime.LastErrorText
    Exit Sub
End If

success = mime.SaveMime("qa_output/encrypted_multi.eml")
If (success = 0) Then
    Debug.Print mime.LastErrorText
    Exit Sub
End If

Debug.Print "Message encrypted for multiple recipients."