(C) Get Certificate Subject Part by Name or OID

Demonstrates the GetSubjectPart method where a name or OID can be passed.

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#include <C_CkCert.h>

void ChilkatSample(void)
    {
    HCkCert cert;
    BOOL success;
    const char *serialNum;

    cert = CkCert_Create();

    success = CkCert_LoadByCommonName(cert,"myCert");
    if (success == FALSE) {
        printf("%s\n",CkCert_lastErrorText(cert));
        CkCert_Dispose(cert);
        return;
    }

    // This example demonstrates getting the SERIALNUMBER part of the subject,
    // if one such part exists in the cert's subject.
    // Not too many certicates include the serial number in the Subject.
    // (Chilean issued certificates for SII is one such case where the SERIALNUMBER part exists within the Subject.)
    serialNum = CkCert_getSubjectPart(cert,"SERIALNUMBER");
    if (CkCert_getLastMethodSuccess(cert) == FALSE) {
        printf("No SERIALNUMBER part exists.\n");
        CkCert_Dispose(cert);
        return;
    }

    printf("%s\n",serialNum);

    // We could also get the part by the OID.
    // See https://oidref.com/2.5.4.5 for a list of OID's in the 2.5.4.* range..
    // The OID for SERIALNUMBER is "2.5.4.5"
    serialNum = CkCert_getSubjectPart(cert,"2.5.4.5");
    if (CkCert_getLastMethodSuccess(cert) == FALSE) {
        printf("No SERIALNUMBER part exists.\n");
        CkCert_Dispose(cert);
        return;
    }

    printf("%s\n",serialNum);


    CkCert_Dispose(cert);

    }