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PKCS11 Certificate Chain

See more PKCS11 Examples

Demonstrates how to make CA certs available for the certificate chain to be included when creating a signature (using a PKCS11 compatible smart card / USB token) such as for PDF, XMLDSig, etc.

Note: This example requires Chilkat v9.5.0.88 or later.

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llSuccess = .F.

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

// Note: Chilkat's PKCS11 implementation runs on Windows, Linux, Mac OS X, and other supported operating systems.

loPkcs11 = createobject("CkPkcs11")

// You will use the DLL (or shared lib) provided by your smart card vendor, or a DLL compatible with your smart card.
// On Windows, if the DLL is located in C:\Windows\System32, specify only the filename.
// Otherwise provide the full path.
loPkcs11.SharedLibPath = "bit4xpki.dll"

llSuccess = loPkcs11.Initialize()
if (llSuccess = .F.) then
    ? loPkcs11.LastErrorText
    release loPkcs11
    return
endif

// Pass -1 for the slotID to open a session on the first non-empty slot.
lnSlotID = -1

// Open a session.
llReadWrite = .T.
llSuccess = loPkcs11.OpenSession(lnSlotID,llReadWrite)
if (llSuccess = .F.) then
    ? loPkcs11.LastErrorText
    release loPkcs11
    return
endif

// Make it an authenticated session by calling Login.
lnUserType = 1
// Make sure to use the correct PIN for your smart card..
lcPin = "0000"
llSuccess = loPkcs11.Login(lnUserType,lcPin)
if (llSuccess = .F.) then
    ? loPkcs11.LastErrorText
    llSuccess = loPkcs11.CloseSession()
    release loPkcs11
    return
endif

// Get the certificate (on the smart card) that has a private key.
loCert = createobject("CkCert")
llSuccess = loPkcs11.FindCert("privateKey","",loCert)
if (llSuccess = .T.) then
    ? "Cert with private key: " + loCert.SubjectCN
else
    ? "No certificates having a private key were found."
    llSuccess = loPkcs11.CloseSession()
    release loPkcs11
    release loCert
    return
endif

// If the certificates in the chain of authentication were contained on the smart card,
// then Chilkat would already have them (via the FindCert function) and the certs in the chain will be automatically used
// as needed when signing occurs.

// If you have CA certs located elsewhere, such as in .cer files, you can make them available to Chilkat in the following way:

loCertVault = createobject("CkXmlCertVault")
// Please review the methods available in the XML certificate vault class.  Different methods exist for adding certificates
// from various sources, such as PEM, PFX, or in-memory sources..
llSuccess = loCertVault.AddCertFile("someDir/caIntermediateCert.cer")
// ...
llSuccess = loCertVault.AddCertFile("someDir/caCert.cer")
// (Your code should check the return value to make sure it succeeded.)

llSuccess = loCert.UseCertVault(loCertVault)
if (llSuccess = .F.) then
    ? loCert.LastErrorText
    llSuccess = loPkcs11.CloseSession()
    release loPkcs11
    release loCert
    release loCertVault
    return
endif

// --------------------------------------------------------------------------
// At this point, we have the cert (and certs in the chain of authentication) to be used for signing.
// The code for using the certificate in creating the digital signature, such as for a PDF, XML, etc., go here...

// --------------------------------------------------------------------------

// Revert to an unauthenticated session by calling Logout.
llSuccess = loPkcs11.Logout()
if (llSuccess = .F.) then
    ? loPkcs11.LastErrorText
    llSuccess = loPkcs11.CloseSession()
    release loPkcs11
    release loCert
    release loCertVault
    return
endif

// When finished, close the session.
// It is important to close the session (memory leaks will occur if the session is not properly closed).
llSuccess = loPkcs11.CloseSession()
if (llSuccess = .F.) then
    ? loPkcs11.LastErrorText
    release loPkcs11
    release loCert
    release loCertVault
    return
endif

? "Success."


release loPkcs11
release loCert
release loCertVault