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(Excel) PKCS11 Find Certificate with Key Usage on Smart Card or USB TokenSee more PKCS11 ExamplesDemonstrates how to find and return the 1st certificate on a smart card or USB token with a desired intended key usage. Note: This example requires Chilkat v9.5.0.91 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 Chilkat.Pkcs11 Set pkcs11 = Chilkat.NewPkcs11 pkcs11.SharedLibPath = "aetpkss1.dll" success = pkcs11.Initialize() If (success = False) Then Debug.Print pkcs11.LastErrorText Exit Sub End If ' We need to call Discover to get the slot ID. ' (A slot is a smart card reader or USB token.) onlyTokensPresent = True Dim json As Chilkat.JsonObject Set json = Chilkat.NewJsonObject success = pkcs11.Discover(onlyTokensPresent,json) If (success = False) Then Debug.Print pkcs11.LastErrorText Exit Sub End If ' Make sure we have at least one slot. If (json.SizeOfArray("slot") <= 0) Then Debug.Print "No occuplied slots." Exit Sub End If ' Get the ID of the 1st slot slotID = json.IntOf("slot[0].id") ' Open a session. readWrite = True success = pkcs11.OpenSession(slotID,readWrite) If (success = False) Then Debug.Print pkcs11.LastErrorText Exit Sub End If ' 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". userType = 1 pin = "0000" success = pkcs11.Login(userType,pin) If (success = False) Then Debug.Print pkcs11.LastErrorText success = pkcs11.CloseSession() Exit Sub End If ' -------------------------------------------------------------------------- Dim cert As Chilkat.Cert Set cert = Chilkat.NewCert ' Find a certificate with an intended key usage. ' Possible key usages to find are: ' ' DigitalSignature ' NonRepudiation ' KeyEncipherment ' DataEncipherment ' CertificateSigning ' CrlSigning ' ' To find a cert having any one of several usages, pass a comma-separated list of usages: success = pkcs11.FindCert("keyUsage","NonRepudiation,DigitalSignature",cert) If (success = True) Then Debug.Print "Cert with private key: "; cert.SubjectCN Else Debug.Print "No certificates having the intended key usage were found." End If ' -------------------------------------------------------------------------- ' Revert to an unauthenticated session by calling Logout. success = pkcs11.Logout() If (success = False) 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 = False) Then Debug.Print pkcs11.LastErrorText Exit Sub End If Debug.Print "Success." |
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