PKCS7 Encrypt using Multiple Certificates

Encrypts MIME using multiple digital certificates. Calls AddEncryptCert once per certificate, followed by a call to EncryptN. The MIME may be decrypted by any owner of one of the certificates + its associated private key.

Download Chilkat MIME ActiveX

LOCAL loMime
LOCAL lnSuccess
LOCAL loCert1
LOCAL loCert2


loMime = CreateObject('Chilkat.Mime')

lnSuccess = loMime.UnlockComponent("Anything for 30-day trial.")
IF (lnSuccess = 0) THEN
    ? loMime.LastErrorText
    QUIT
ENDIF

*  Build a simple MIME message to be encrypted:
loMime.AddHeaderField("Content-Type","text/plain")
loMime.AddHeaderField("abc","123")
loMime.SetBody("This is a test")

*  A digital certificate is required to create PKCS7 encrypted MIME.
*  It can come from a variety of sources: .cer file, .pfx file, PEM files,
*  an in-memory representation, or directly from a Windows
*  registry-based certificate store.

*  Load one cert from a .cer file:
loCert1 = CreateObject('Chilkat.Cert')
lnSuccess = loCert1.LoadFromFile("myCert.cer")
IF (lnSuccess = 0) THEN
    ? loCert1.LastErrorText
    QUIT
ENDIF

*  Load another cert from the Windows registry store:
loCert2 = CreateObject('Chilkat.Cert')
lnSuccess = loCert2.LoadByCommonName("Chilkat Sales")
IF (lnSuccess = 0) THEN
    ? loCert2.LastErrorText
    QUIT
ENDIF

*  Tell the MIME object to use these certs for encrypting:
*  (AddEncryptCert shouldn't fail if we already know it contains
*  a valid certificate..)
lnSuccess = loMime.AddEncryptCert(loCert1)
lnSuccess = loMime.AddEncryptCert(loCert2)

*  Encrypt the MIME:
lnSuccess = loMime.EncryptN()
IF (lnSuccess = 0) THEN
    ? loMime.LastErrorText
    QUIT
ENDIF

*  Display the MIME:
? loMime.GetMime()

*  The resulting S/MIME looks something like this:
*  
abc: 123
Content-Disposition: attachment; filename="smime.p7m"
Content-Transfer-Encoding: base64
Content-Type: application/x-pkcs7-mime;
 name="smime.p7m"

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