(Visual FoxPro) 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.

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

LOCAL loMime
LOCAL lnSuccess
LOCAL loCert1
LOCAL loCert2

* 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')

* Build a simple MIME message to be encrypted:
lnSuccess = loMime.AddHeaderField("Content-Type","text/plain")
lnSuccess = 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:
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Cert')
loCert1 = CreateObject('Chilkat.Cert')
lnSuccess = loCert1.LoadFromFile("myCert.cer")
IF (lnSuccess = 0) THEN
    ? loCert1.LastErrorText
    RELEASE loMime
    RELEASE loCert1
    CANCEL
ENDIF

* Load another cert ...
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Cert')
loCert2 = CreateObject('Chilkat.Cert')
lnSuccess = loCert2.LoadFromFile("anotherCert.cer")
IF (lnSuccess = 0) THEN
    ? loCert2.LastErrorText
    RELEASE loMime
    RELEASE loCert1
    RELEASE loCert2
    CANCEL
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
    RELEASE loMime
    RELEASE loCert1
    RELEASE loCert2
    CANCEL
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"
* 
* MIID4QYJKoZIhvcNAQcDoIID0jCCA84CAQAxggNlMIIBgQIBADBpMFUxCzAJBgNVBAYTAlpBMSUw
* IwYDVQQKExxUaGF3dGUgQ29uc3VsdGluZyAoUHR5KSBMdGQuMR8wHQYDVQQDExZUaGF3dGUgQ29k
* ZSBTaWduaW5nIENBAhB4ouTcAmLszrGi170k1deSMA0GCSqGSIb3DQEBAQUABIIBAKnOPgmISrNH
* Hd+zESvH5dl5TvBLCxLuIuH6cuZdowHzCqAUzaYFdn1rp88Vvu2x3s6WOvzje/+dE1x0YjEpeqxd
* ufehlb6Jl9ucxSMWARWMxWGxu0eZGJVt+SBBrVddqdtrIU9lVt5rBxkU67P8PxgbwdNCX3qJENRO
* P/rvp5ngoCkpIxeGqSkPvWv+CA3IXS8FPs8Sl4HNPiAj3e9RBm2MxI1u4cn1HvgGg8yHgHLMG5JF
* LzGsmotSQaqEwq2JtOlkjfOwEI+ZhbWQupj6gen2aGc5sW3J26H1usxtV2TQ7WRRxqnZGmlh20dW
* 4lo3kITYI+iapGlJXmrlDYh2CjkwggHcAgEAMIHDMIGuMQswCQYDVQQGEwJVUzELMAkGA1UECBMC
* VVQxFzAVBgNVBAcTDlNhbHQgTGFrZSBDaXR5MR4wHAYDVQQKExVUaGUgVVNFUlRSVVNUIE5ldHdv
* cmsxITAfBgNVBAsTGGh0dHA6Ly93d3cudXNlcnRydXN0LmNvbTE2MDQGA1UEAxMtVVROLVVTRVJG
* aXJzdC1DbGllbnQgQXV0aGVudGljYXRpb24gYW5kIEVtYWlsAhAj50QEWUPwA+jXOiL8sMwXMA0G
* CSqGSIb3DQEBAQUABIIBAFQ1cydWC4M9tdgAlCN03kP8eyuXajwT+5ByhOcJhjuCABg7U8w4Rx28
* braGqV+TCBxjyMsqD0KcW49VT6ZHMpQ1yN8R72qDsidmfm9w3u0jVgsaaBkTJXMy4COY/3cZWmYG
* dL3Qty8uFeQYddytt6UPJpGJZYsrdFG2doe6qHiRtAxxPrd0GmQRcGvxyDdsojkoBlTMbfwaXOI3
* xepR/oh60x/3npUCsl2VpNPfo6oZoej6YZGEuz2MvuWvXVhvuqoTqXGwGDgYMxwTbPwklqZiJtsK
* r5Ep3NlWAQX8MGWL0H+NC22cqJuqUCL05yqyAv+JMCpZGAwOVb/wiVNjpAIwYAYJKoZIhvcNAQcB
* MBkGCCqGSIb3DQMCMA0CAToECA5NAJY12cU+gDgZFUc+nsQUUbiR1GH8iBVLI+XWlja9TXEe1Hzt
* NlsOylRVBDzjNxUtX/zC0YR7bs+2Cf4JbyuMOA==

RELEASE loMime
RELEASE loCert1
RELEASE loCert2