(Visual FoxPro) Create CMS (PKCS7) Detached MIME Signature

Demonstrates how to add a CMS detached signature to MIME.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL loMime
LOCAL loCert
LOCAL lnSuccess

* This example assumes the Chilkat API to have been previously unlocked.
* See Global Unlock Sample for sample code.

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Mime')
loMime = CreateObject('Chilkat.Mime')

* Load a certificate w/ private key for signing.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Cert')
loCert = CreateObject('Chilkat.Cert')
lnSuccess = loCert.LoadPfxFile("qa_data/pfx/ecc256_12345.p12","12345")
IF (lnSuccess <> 1) THEN
    ? loCert.LastErrorText
    RELEASE loMime
    RELEASE loCert
    CANCEL
ENDIF

? "Cert: " + loCert.SubjectDN

* Create a simple MIME message to be signed:
loMime.AddHeaderField("Subject","This is a test")
loMime.AddHeaderField("MyCustomHeader","abc123")
loMime.ContentType = "text/plain"
loMime.SetBody("This is a plain-text body.")

* Examine the MIME prior to signing:
? "--- MIME prior to signing ---"
? loMime.GetMime()

* The MIME prior to signing looks like this:

* Subject: This is a test
* MyCustomHeader: abc123
* Content-Type: text/plain; format=flowed
* 
* This is a plain-text body.

* Use SHA256 as the hash algorithm in the CMS signature.
loMime.SigningHashAlg = "SHA256"

* Add a detached signature:
lnSuccess = loMime.AddDetachedSignature(loCert)
IF (lnSuccess = 0) THEN
    ? loMime.LastErrorText
    RELEASE loMime
    RELEASE loCert
    CANCEL
ENDIF

* Examine the MIME with detached signature:
? "--- MIME with detached signature ---"
? loMime.GetMime()

* Content-Type: multipart/signed; boundary="----=_NextPart_6e3_c655_9641494d.b4f00501";
*  protocol="application/x-pkcs7-signature";
*  micalg=sha256
* 
* ------=_NextPart_6e3_c655_9641494d.b4f00501
* Subject: This is a test
* MyCustomHeader: abc123
* Content-Type: text/plain; format=flowed
* 
* This is a plain-text body.
* ------=_NextPart_6e3_c655_9641494d.b4f00501
* Content-Transfer-Encoding: base64
* Content-Type: application/x-pkcs7-signature; name="smime.p7s"
* Content-Disposition: attachment; filename="smime.p7s"
* 
* MIID7AYJKoZIhvcNAQcCoIID3TCCA9kCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg
* ggJxMIICbTCCAhOgAwIBAgIJAJuS2kgOoyr+MAkGByqGSM49BAEwWzELMAkGA1UEBhMCQVUxEzAR
* BgNVBAgTClNvbWUtU3RhdGUxITAfBgNVBAoTGEludGVybmV0IFdpZGdpdHMgUHR5IEx0ZDEUMBIG
* A1UEAxMLZWNjMjU2LXRlc3QwHhcNMTYwODIzMTU0OTM5WhcNNDQwMTA4MTU0OTM5WjBbMQswCQYD
* VQQGEwJBVTETMBEGA1UECBMKU29tZS1TdGF0ZTEhMB8GA1UEChMYSW50ZXJuZXQgV2lkZ2l0cyBQ
* dHkgTHRkMRQwEgYDVQQDEwtlY2MyNTYtdGVzdDBZMBMGByqGSM49AgEGCCqGSM49AwEHA0IABARy
* Hd86A7+qQ4DlIfKynZaFGdGLpkU3GlQwqaVD6GIJg3QIDhaWEksYtZ9OWjNHn9a6+i/P9o5/NrdI
* SP0VWDWjgcAwgb0wHQYDVR0OBBYEFGmd2DfK4c3VBTVn8ebKH2BTmRicMIGNBgNVHSMEgYUwgYKA
* FGmd2DfK4c3VBTVn8ebKH2BTmRicoV+kXTBbMQswCQYDVQQGEwJBVTETMBEGA1UECBMKU29tZS1T
* dGF0ZTEhMB8GA1UEChMYSW50ZXJuZXQgV2lkZ2l0cyBQdHkgTHRkMRQwEgYDVQQDEwtlY2MyNTYt
* dGVzdIIJAJuS2kgOoyr+MAwGA1UdEwQFMAMBAf8wCQYHKoZIzj0EAQNJADBGAiEAhuiwGy0lZKtK
* LA13Ffc8AMTK7NsePPSfs0clXlZUR78CIQDXsJXpYsJ7tlTeockrK+6099sG/gGFTRPiQYU8juyf
* LzGCAT8wggE7AgEBMGgwWzELMAkGA1UEBhMCQVUxEzARBgNVBAgTClNvbWUtU3RhdGUxITAfBgNV
* BAoTGEludGVybmV0IFdpZGdpdHMgUHR5IEx0ZDEUMBIGA1UEAxMLZWNjMjU2LXRlc3QCCQCbktpI
* DqMq/jANBglghkgBZQMEAgEFAKBpMBgGCSqGSIb3DQEJAzELBgkqhkiG9w0BBwEwHAYJKoZIhvcN
* AQkFMQ8XDTIyMDUwODE0MzM1NFowLwYJKoZIhvcNAQkEMSIEIMvNpYuymLvF68aFFe+l3NEQTdkB
* 7T8U6/j+Y5FgDlIUMAoGCCqGSM49BAMCBEYwRAIgQ6migEn3Le9ciIVUP/qc2JZAJZWjpulJXY9Q
* IZJ3XK0CIGZwpLOgiv7ES8958hqT9a/q7aPc1xmkaZHtsat/k+Ki
* 
* ------=_NextPart_6e3_c655_9641494d.b4f00501--

RELEASE loMime
RELEASE loCert