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(Visual Basic 6.0) PKCS11 Certificate ChainSee more PKCS11 ExamplesDemonstrates 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.
' 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. Dim pkcs11 As New ChilkatPkcs11 ' 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. pkcs11.SharedLibPath = "bit4xpki.dll" Dim success As Long success = pkcs11.Initialize() If (success = 0) Then Debug.Print pkcs11.LastErrorText Exit Sub End If ' Pass -1 for the slotID to open a session on the first non-empty slot. Dim slotID As Long slotID = -1 ' Open a session. Dim readWrite As Long readWrite = 1 success = pkcs11.OpenSession(slotID,readWrite) If (success = 0) Then Debug.Print pkcs11.LastErrorText Exit Sub End If ' Make it an authenticated session by calling Login. Dim userType As Long userType = 1 ' Make sure to use the correct PIN for your smart card.. Dim pin As String pin = "0000" success = pkcs11.Login(userType,pin) If (success = 0) Then Debug.Print pkcs11.LastErrorText success = pkcs11.CloseSession() Exit Sub End If ' Get the certificate (on the smart card) that has a private key. Dim cert As New ChilkatCert success = pkcs11.FindCert("privateKey","",cert) If (success = 1) Then Debug.Print "Cert with private key: " & cert.SubjectCN Else Debug.Print "No certificates having a private key were found." success = pkcs11.CloseSession() Exit Sub End If ' 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: Dim certVault As New ChilkatXmlCertVault ' 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.. success = certVault.AddCertFile("someDir/caIntermediateCert.cer") ' ... success = certVault.AddCertFile("someDir/caCert.cer") ' (Your code should check the return value to make sure it succeeded.) success = cert.UseCertVault(certVault) If (success = 0) Then Debug.Print cert.LastErrorText success = pkcs11.CloseSession() Exit Sub End If ' -------------------------------------------------------------------------- ' 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. success = pkcs11.Logout() If (success = 0) Then Debug.Print pkcs11.LastErrorText success = pkcs11.CloseSession() Exit Sub End If ' When finished, close the session. ' It is important to close the session (memory leaks will occur if the session is not properly closed). success = pkcs11.CloseSession() If (success = 0) Then Debug.Print pkcs11.LastErrorText Exit Sub End If Debug.Print "Success." |
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