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PKCS11 Find Specific Certificate on Smart Card or USB Token

See more PKCS11 Examples

This example code shows how to find a particular certificate on a smart card or USB token.

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")

// Set your shared lib path -- either a full path to the DLL, .so, or .dylib,
// or just the filename if the driver is in a location that can be automatically found. (Such as in C:\Windows\System32)
loPkcs11.SharedLibPath = "C:/Program Files (x86)/Gemalto/IDGo 800 PKCS#11/IDPrimePKCS1164.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.
// 
// If we don't authenticate, then we won't be able to see the private keys, and thus
// we won't know which certificates have an associated private key stored on the smart card.

// The smart card PIN is passed to the Login method.
// userType 1 indicates a "Normal User".
lnUserType = 1
lcPin = "0000"
llSuccess = loPkcs11.Login(lnUserType,lcPin)
if (llSuccess = .F.) then
    ? loPkcs11.LastErrorText
    llSuccess = loPkcs11.CloseSession()
    release loPkcs11
    return
endif

// --------------------------------------------------------------------------
// The FindCert method can find a particular certificate in a number of different ways.
// I'll demonstrate some common ways..

// 1) In many cases you'll be working with a smart card that contains one certificate that is to be used for 
// signing, and it is the certificate that is associated with the private key also stored on the smart card (or USB token).
// There may be other certificates on the card, but these are the issuer certificates in the chain of authentication.
// You're just interested in getting the certificate with the private key.
// You can do it like this:
loCert = createobject("CkCert")
// Pass the keyword "privateKey" in the 1st argument, and an empty string in the 2nd arg.
// This returns the 1st certificate that has a private key.
llSuccess = loPkcs11.FindCert("privateKey","",loCert)
if (llSuccess = .T.) then
    ? "Cert with private key: " + loCert.SubjectCN
else
    ? "No certificates having a private key were found."
endif

// 2) Find a certificate by the Subject Common Name
llSuccess = loPkcs11.FindCert("subjectCN","Chil application account (8c9be8e0-5544-4cd0-9062-290fbff353a7)",loCert)
if (llSuccess = .T.) then
    ? "Found: " + loCert.SubjectCN
else
    ? "Not found: " + loCert.SubjectCN
endif

// 3) Find a certificate by hex serial number
llSuccess = loPkcs11.FindCert("serial","5087bf1feda006af54a02f23a851104948acc26f",loCert)
if (llSuccess = .T.) then
    ? "Found: " + loCert.SerialNumber
else
    ? "Not found: " + loCert.SerialNumber
endif

// 4) Find a certificate by hex serial number and Issuer Common Name
llSuccess = loPkcs11.FindCert("serial:issuerCN","5087bf1feda006af54a02f23a851104948acc26f:Ibanity Production Third Party Application CA",loCert)
if (llSuccess = .T.) then
    ? "Found: " + loCert.SubjectCN
else
    ? "Not found: " + loCert.SubjectCN
endif

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

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

? "Success."


release loPkcs11
release loCert