(DataFlex) Find Certificate on Smartcard Currenty in Reader

Finds the certificates on smartcards currently in readers.

Note: This example requires Chilkat v9.5.0.77 or greater.

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

Use ChilkatAx-win32.pkg

Procedure Test
    Handle hoCsp
    Variant vSt
    Handle hoSt
    Boolean iSuccess
    Integer i
    Integer iNumProviders
    Handle hoCertStore
    Integer iNumContainers
    String sKeyContainerName
    Variant vCert
    Handle hoCert
    String sTemp1
    Boolean bTemp1

    // This newer example is a much better way to get the certificate on a smartcard or USB token

    // This example requires that we already know the name of the CSP (Cryptographic Service Provider) for the smartcard.
    // It is often the "Microsoft Base Smart Card Crypto Provider".  You can see what CSP's are registered on your system with this code:

    Get Create (RefClass(cComChilkatCsp)) To hoCsp
    If (Not(IsComObjectCreated(hoCsp))) Begin
        Send CreateComObject of hoCsp
    End
    Get Create (RefClass(cComChilkatStringTable)) To hoSt
    If (Not(IsComObjectCreated(hoSt))) Begin
        Send CreateComObject of hoSt
    End

    Get pvComObject of hoSt to vSt
    Get ComGetProviders Of hoCsp vSt To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoCsp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Iterate over the CSP names..
    Move 0 To i
    Get ComCount Of hoSt To iNumProviders
    While (i < iNumProviders)
        Get ComStringAt Of hoSt i To sTemp1
        Showln i ": " sTemp1
        Move (i + 1) To i
    Loop

    // --------------------------
    // This newer example is a much better way to get the certificate on a smartcard or USB token

    // We'll assume our smartcard is accessed through the "Microsoft Base Smart Card Crypto Provider"
    // Also, we'll assume that the certificate has been installed into the default current user Windows
    // certificate store by following the instructions provided by the smartcard vendor.
    // (The certificate does not contain the private key.  The certificate should be installed in the
    // Windows current user certificate store.  It will also be on the smartcard, and the associated private
    // key is only on the smartcard.)
    // 

    // First open the Current User Certificate Store.  We'll need it soon..
    Get Create (RefClass(cComChilkatCertStore)) To hoCertStore
    If (Not(IsComObjectCreated(hoCertStore))) Begin
        Send CreateComObject of hoCertStore
    End
    Get ComOpenCurrentUserStore Of hoCertStore True To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoCertStore To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Create a Csp object and set the ProviderName equal to our desired CSP name.
    // (setting the ProviderName selects the desired CSP.)
    Set ComProviderName Of hoCsp To "Microsoft Base Smart Card Crypto Provider"

    // Iterate over the key containers managed by this CSP.
    // These will be the key containers for the cards currently inserted into the reader(s).
    // If only one smartcard reader exists, and a smartcard is inserted, there should be one
    // key container.
    Get ComNumKeyContainers Of hoCsp To iNumContainers

    Showln "numContainers = " iNumContainers

    Move 0 To i
    While (i < iNumContainers)
        // For each key container, get the key container name and then find the certificate
        // in the Current User Certicate Store with the matching key container name.
        Get ComNthKeyContainerName Of hoCsp i To sKeyContainerName

        Get ComFindCertByKeyContainer Of hoCertStore sKeyContainerName To vCert
        If (IsComObject(vCert)) Begin
            Get Create (RefClass(cComChilkatCert)) To hoCert
            Set pvComObject Of hoCert To vCert
        End
        Get ComLastMethodSuccess Of hoCertStore To bTemp1
        If (bTemp1 = True) Begin
            Get ComSubjectCN Of hoCert To sTemp1
            Showln "Certificate in reader: " sTemp1
            Send Destroy of hoCert
        End

        Move (i + 1) To i
    Loop



End_Procedure