(C++) Examine SSL/TLS Server Certificate

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Demonstrates how an application can examine and check a server's SSL/TLS certificate.

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#include <CkSocket.h>
#include <CkCert.h>

void ChilkatSample(void)
    {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkSocket socket;

    // Connect to a server.
    bool useTls = true;
    int maxWaitMs = 2000;
    bool success = socket.Connect("www.intel.com",443,useTls,maxWaitMs);
    if (success == false) {
        std::cout << socket.lastErrorText() << "\r\n";
        return;
    }

    // If we get here, the TLS connection ws made..
    // In any SSL/TLS handshake, the server sends its certificate in a TLS handshake message.
    // Chilkat will keep it cached within the object that made the connection.
    // Get the server's cert and examine a few things.
    CkCert *cert = socket.GetSslServerCert();
    if (socket.get_LastMethodSuccess() == false) {
        // This is unexpected..
        std::cout << socket.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "Distinguished Name: " << cert->subjectDN() << "\r\n";
    std::cout << "Common Name: " << cert->subjectCN() << "\r\n";
    std::cout << "Issuer Distinguished Name: " << cert->issuerDN() << "\r\n";
    std::cout << "Issuer Common Name: " << cert->issuerCN() << "\r\n";

    std::cout << "Expired: " << cert->get_Expired() << "\r\n";
    std::cout << "Revoked: " << cert->get_Revoked() << "\r\n";
    std::cout << "Signature Verified: " << cert->get_SignatureVerified() << "\r\n";
    std::cout << "Trusted Root: " << cert->get_TrustedRoot() << "\r\n";

    // Sample output:

    // Distinguished Name: C=US, ST=California, O=Intel Corporation, CN=*.intel.com
    // Common Name: *.intel.com
    // Issuer Distinguished Name: C=GB, ST=Greater Manchester, L=Salford, O=Sectigo Limited, CN=Sectigo RSA Organization Validation Secure Server CA
    // Issuer Common Name: Sectigo RSA Organization Validation Secure Server CA
    // Expired: False
    // Revoked: False
    // Signature Verified: True
    // Trusted Root: True

    delete cert;
    }