PureBasic

Load Certificate from Smart Card by Key Usage

See more Certificates Examples

You may have a smartcard or USB token that contains only 2 certificates, one for signing, and one for authentication, and you wish to load the certificate for signing. This example demonstrates how to load the 1st certificate found on a smartcard that matches the intended key usage. PureBasic

IncludeFile "CkCert.pb"

Procedure ChilkatExample()

    success.i = 0

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

    cert.i = CkCert::ckCreate()
    If cert.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; If you know the smart card PIN, set it prior to loading from the smartcard/USB token.
    CkCert::setCkSmartCardPin(cert, "12345678")

    ; To load a certificate matching an intended key usage, specify the type of usage as shown below.
    ; 
    ; The possible key usage keywords are:
    ; 
    ; digitalsignature
    ; Use when the public key is used with a digital signature mechanism to support security services other than non-repudiation, certificate signing, or CRL signing. 
    ; A digital signature is often used for entity authentication and data origin authentication with integrity.

    ; nonrepudiation
    ; When a digital certificate's key usage includes "nonrepudiation," it implies that the certificate and its associated private key can be used to 
    ; create digital signatures that provide proof of the origin and integrity of the signed data, and the signer cannot later deny having signed the data.

    ; Other less common usages:

    ; certificatesigning
    ; keyencipherment
    ; dataencipherment
    ; crlsigning
    ; secureemail
    ; serverauthentication
    ; clientauthentication
    ; codesigning
    ; timestamping

    success = CkCert::ckLoadFromSmartcard(cert,"keyusage=nonrepudiation")
    If success = 0
        Debug CkCert::ckLastErrorText(cert)
        Debug "Certificate not loaded."
        CkCert::ckDispose(cert)
        ProcedureReturn
    EndIf

    Debug "Found: " + CkCert::ckSubjectDN(cert) + " serial=" + CkCert::ckSerialNumber(cert)


    CkCert::ckDispose(cert)


    ProcedureReturn
EndProcedure