B4X

ScMinidriver - Find and Load Certificate from Smart Card or USB Token

See more ScMinidriver Examples

Demonstrates how to find and load a specific certificate located on a smart card or USB token. B4X

Dim success As Boolean = False

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

Dim scmd As ChilkatScMinidriver
scmd.Initialize

'  Reader names (smart card readers or USB tokens) can be discovered
'  via List Readers or Find Smart Cards
Dim readerName As String = "SCM Microsystems Inc. SCR33x USB Smart Card Reader 0"
success = scmd.AcquireContext(readerName)
If success = False Then
    Log(scmd.LastErrorText)
    Return
End If


'  If successful, the name of the currently inserted smart card is available:
Log("Card name: " & scmd.CardName)

'  If desired, perform regular PIN authentication with the smartcard.
'  For more details about smart card PIN authentication, see the Smart Card PIN Authentication Example
Dim retval As Int = scmd.PinAuthenticate("user", "000000")
If retval <> 0 Then
    Log("PIN Authentication failed.")
End If


'  You can find a cerficate using any of the following certificate parts:
'  "subjectDN" -- The full distinguished name of the cert.
'  "subjectDN_withTags" -- Same as above, but in a format that includes the subject part tags, such as the "CN=" in "CN=something"
'  "subjectCN" -- The common name part (CN) of the certificate's subject.
'  "serial" -- The certificate serial number.
'  "serial:issuerCN" -- The certificate serial number + the issuer's common name, delimited with a colon char.
'  These are the same certificate parts that can be retrieved by listing certificates on the smart card (or USB token).
'  See List Certificates on Smart Card Example
Dim certPart As String = "subjectCN"
Dim partValue As String = "PIVKey E42D60A759D39147A26E0AF2FB1183C5"

'  If the certificate is found, it is loaded into the cert object.
Dim cert As ChilkatCert
cert.Initialize("cert")
success = scmd.FindCert(certPart, partValue, cert)
If success = False Then
    Log("Failed to find the certificate.")
Else
    Log("Successfully loaded the cert object from the smart card / USB token.")

    '  Note: When successful, the cert object is internally linked to the ScMinidriver object's authenticated session.
    '  The cert object can now be used to sign or do other cryptographic operations that occur on the smart card / USB token.
    '  If your application calls PinDeauthenticate or DeleteContext, the cert will no longer be able to sign on the smart card
    '  because the smart card ScMinidriver session will no longer be authenticated or deleted.
End If


'  ...
'  ...
'  ...

'  When finished with operations that required authentication, you may if you wish, deauthenticate the session.
success = scmd.PinDeauthenticate("user")
If success = False Then
    Log(scmd.LastErrorText)
End If


'  Delete the context when finished with the card.
success = scmd.DeleteContext
If success = False Then
    Log(scmd.LastErrorText)
End If