Check if Certificate Expired

How to check to see if a digital certificate is expired.

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

// Needs #include <CkCert.h>

    CkString strOut;

    CkCert cert;

    //  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:
    bool success;
    success = cert.LoadByCommonName("Chilkat Software, Inc.");
    if (success == false) {
        strOut.append("Failed to find certificate!\r\n");
    }
    else {

        //  Display the certificate's distinguished name:
        strOut.append(cert.subjectDN());
        strOut.append("\r\n");

        bool isExpired;

        isExpired = cert.get_Expired();
        if (isExpired == true) {
            strOut.append("Certificate is expired.");
            strOut.append("\r\n");
        }
        else {
            strOut.append("Certificate is NOT expired.");
            strOut.append("\r\n");
        }

    }

    //  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 = cert.LoadFromFile("myCert.cer");
    if (success == false) {
        strOut.append("Failed to load certificate!\r\n");
    }
    else {

        //  Display the certificate's distinguished name:
        strOut.append(cert.subjectDN());
        strOut.append("\r\n");

        isExpired = cert.get_Expired();
        if (isExpired == true) {
            strOut.append("Certificate is expired.");
            strOut.append("\r\n");
        }
        else {
            strOut.append("Certificate is NOT expired.");
            strOut.append("\r\n");
        }

    }

    //  The Chilkat Certificate, Certificate Store, Private Key,
    //  Public Key, and Key Container classes / objects are freeware.

    //  They are used by and included with the Chilkat Email,
    //  Crypt, S/MIME, and other commercial Chilkat components.


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());