Check Certificate for Private Key

Checks to see if a certificate has its associated private key installed on the computer.

Detailed Instructions for Installing a PFX for Use by ASP / ASP.NET

Downloads:

MS Windows Visual C/C++ Libraries

Linux/CentOS C/C++ Libraries

MAC OS X C/C++ Libraries

Solaris C/C++ Libraries

C++ Builder Libraries

FreeBSD C++ Libraries

HP-UX C++ Libraries

BlackBerry QNX C++ Libraries

#include <C_CkCert.h>

void ChilkatSample(void)
    {
    HCkCert cert;
    BOOL success;
    BOOL hasPrivKey;

    cert = CkCert_Create();

    //  There are many ways of loading a Chilkat certificate object:
    //  1) From a Windows registry-based certificate store.
    //  2) From a PFX file.
    //  3) From a DER encoded .cer file.
    //  4) From a PEM file.

    //  The point of this example is to show how to check for the existence
    //  of a usable private key.  This is done by calling the HasPrivateKey method.

    //  The LoadByCommonName method searches the registry-based
    //  Windows Current User Certificate Store and Local Machine Certificate
    //  Store for a certificate whose common name (CN) matches
    //  the argument:

    success = CkCert_LoadByCommonName(cert,"Chilkat Software, Inc.");
    if (success == FALSE) {
        printf("Failed to find certificate!\n");
    }
    else {

        //  Display the certificate's distinguished name:
        printf("%s\n",CkCert_subjectDN(cert));

        hasPrivKey = CkCert_HasPrivateKey(cert);
        if (hasPrivKey == TRUE) {
            printf("Certificate has a usable private key.\n");
        }
        else {
            printf("Certificate does not have a private key.\n");
        }

        //  If HasPrivateKey returns FALSE, it's possible that the private key
        //  does exist, but the calling process does not have permission to access it.

        //  If your program is running under IIS (perhaps in a web service), you need
        //  rights to the private key to perform a signature, and the IIS processes
        //  typically runs in the default IIS Application Pool under the
        //  NETWORK_SERVICE ID, which has no rights.

        //  Grant the ID Full Control rights to the private key which is stored in
        //  C:\Documents and Settings\All Users\Application Data\Microsoft\Crypto\RSA\Machine Keys.
        //  (Perhaps lesser rights would work; you may experiment).

    }

    //  Alternatively, load a Certificate from a .cer file.
    //  (Certs may also be loaded from other types of files, such as PEM, DER, PFX, etc.)
    success = CkCert_LoadFromFile(cert,"myCert.cer");
    if (success == FALSE) {
        printf("Failed to load certificate!\n");
    }
    else {

        hasPrivKey = CkCert_HasPrivateKey(cert);
        if (hasPrivKey == TRUE) {
            printf("Certificate has a usable private key.\n");
        }
        else {
            printf("Certificate does not have a private key.\n");
        }

    }


    CkCert_Dispose(cert);

    }