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


Dim privKey As ChilkatPrivateKey
privKey.Initialize("privKey")
success = privKey.LoadPemFile("qa_data/recipient_privkey.pem")
If success = False Then
    Log(privKey.LastErrorText)
    Return
End If


success = mime.Decrypt2(cert, privKey)
If success = False Then
    Log(mime.LastErrorText)
    Return
End If


Dim body As String = mime.GetBodyDecoded
If mime.LastMethodSuccess = False Then
    Log(mime.LastErrorText)
    Return
End If

Log(body)