Visual FoxPro

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. Visual FoxPro

LOCAL lnSuccess
LOCAL loCert

lnSuccess = 0

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

loCert = CreateObject('Chilkat.Cert')

* If you know the smart card PIN, set it prior to loading from the smartcard/USB token.
loCert.SmartCardPin = "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

lnSuccess = loCert.LoadFromSmartcard("keyusage=nonrepudiation")
IF (lnSuccess = 0) THEN
    ? loCert.LastErrorText
    ? "Certificate not loaded."
    RELEASE loCert
    CANCEL
ENDIF

? "Found: " + loCert.SubjectDN + " serial=" + loCert.SerialNumber

RELEASE loCert