(Visual FoxPro) Create PKCS7 Attached/Opaque Signature (S/MIME)

Create an S/MIME message with a PKCS7 attached/opaque signature.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

LOCAL loMime
LOCAL loCert
LOCAL lcPfxFilepath
LOCAL lcPfxPassword
LOCAL lnSuccess

* This example requires 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.
* There are many ways of getting a certificate object:
* from a pfx file, from .cer and private-key files, from the
* Windows registry-based certificate stores, etc.
* Load a PFX file into a certificate object.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Cert')
loCert = CreateObject('Chilkat.Cert')
lcPfxFilepath = "pfxFiles/something.pfx"
lcPfxPassword = "secret"
lnSuccess = loCert.LoadPfxFile(lcPfxFilepath,lcPfxPassword)
IF (lnSuccess = 0) THEN
    ? loCert.LastErrorText
    RELEASE loMime
    RELEASE loCert
    CANCEL
ENDIF

* Create a very simple MIME message to be signed:
lnSuccess = loMime.AddHeaderField("Subject","This is a test")
lnSuccess = 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
* 
* This is a plain-text body.

* -------------------------------------------------------------------------------

* The default hash algorithm used in the signing process is "SHA1".
* To change it, set the SigningHashAlg property:
loMime.SigningHashAlg = "SHA256"

* Convert the MIME to PKCS7 signed-data.
lnSuccess = loMime.ConvertToSigned(loCert)
IF (lnSuccess = 0) THEN
    ? loMime.LastErrorText
    RELEASE loMime
    RELEASE loCert
    CANCEL
ENDIF

* Examine the signed MIME
? "--- MIME converted to PKCS7 signed-data ---"
? loMime.GetMime()

* The MIME after signing looks like this:
* -------------------------------------------------------------------------------

* Subject: This is a test
* MyCustomHeader: abc123
* Content-Disposition: attachment; filename="smime.p7m"
* Content-Transfer-Encoding: base64
* Content-Type: application/x-pkcs7-mime;
*  name="smime.p7m"; smime-type="signed-data"
* 
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* 

* ------------------------------------------------------------------------------

RELEASE loMime
RELEASE loCert