Decrypt S/MIME with an Explicit Certificate and Private Key

See more MIME Examples

Loads a CMS/PKCS #7 encrypted S/MIME message and decrypts it back to the original MIME content.

Decrypt2 accepts the certificate and its private key directly as arguments.

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 Boolean = False

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


'  Decrypt using an explicitly supplied certificate and private key.  The 1st argument is the
'  certificate and the 2nd is its private key.
Dim cert As New Chilkat.Cert
success = cert.LoadFromFile("qa_data/recipient.cer")
If (success = False) Then
    Debug.WriteLine(cert.LastErrorText)
    Exit Sub
End If


Dim privKey As New Chilkat.PrivateKey
success = privKey.LoadPemFile("qa_data/recipient_privkey.pem")
If (success = False) Then
    Debug.WriteLine(privKey.LastErrorText)
    Exit Sub
End If


success = mime.Decrypt2(cert,privKey)
If (success = False) Then
    Debug.WriteLine(mime.LastErrorText)
    Exit Sub
End If


Dim body As String = mime.GetBodyDecoded()
If (mime.LastMethodSuccess = False) Then
    Debug.WriteLine(mime.LastErrorText)
    Exit Sub
End If

Debug.WriteLine(body)