(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 <C_CkSocket.h>
#include <C_CkCert.h>

void ChilkatSample(void)
    {
    HCkSocket socket;
    BOOL useTls;
    int maxWaitMs;
    BOOL success;
    HCkCert cert;

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

    socket = CkSocket_Create();

    // Connect to a server.
    useTls = TRUE;
    maxWaitMs = 2000;
    success = CkSocket_Connect(socket,"www.intel.com",443,useTls,maxWaitMs);
    if (success == FALSE) {
        printf("%s\n",CkSocket_lastErrorText(socket));
        CkSocket_Dispose(socket);
        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.
    cert = CkSocket_GetSslServerCert(socket);
    if (CkSocket_getLastMethodSuccess(socket) == FALSE) {
        // This is unexpected..
        printf("%s\n",CkSocket_lastErrorText(socket));
        CkSocket_Dispose(socket);
        return;
    }

    printf("Distinguished Name: %s\n",CkCert_subjectDN(cert));
    printf("Common Name: %s\n",CkCert_subjectCN(cert));
    printf("Issuer Distinguished Name: %s\n",CkCert_issuerDN(cert));
    printf("Issuer Common Name: %s\n",CkCert_issuerCN(cert));

    printf("Expired: %d\n",CkCert_getExpired(cert));
    printf("Revoked: %d\n",CkCert_getRevoked(cert));
    printf("Signature Verified: %d\n",CkCert_getSignatureVerified(cert));
    printf("Trusted Root: %d\n",CkCert_getTrustedRoot(cert));

    // 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

    CkCert_Dispose(cert);


    CkSocket_Dispose(socket);

    }