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 Long
success = 0

Dim mime As New ChilkatMime
success = mime.LoadMimeFile("qa_data/encrypted.eml")
If (success = 0) Then
    Debug.Print 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 ChilkatCert
success = cert.LoadFromFile("qa_data/recipient.cer")
If (success = 0) Then
    Debug.Print cert.LastErrorText
    Exit Sub
End If

Dim privKey As New PrivateKey
success = privKey.LoadPemFile("qa_data/recipient_privkey.pem")
If (success = 0) Then
    Debug.Print privKey.LastErrorText
    Exit Sub
End If

success = mime.Decrypt2(cert,privKey)
If (success = 0) Then
    Debug.Print mime.LastErrorText
    Exit Sub
End If

Dim body As String
body = mime.GetBodyDecoded()
If (mime.LastMethodSuccess = 0) Then
    Debug.Print mime.LastErrorText
    Exit Sub
End If

Debug.Print body