(C) Get the Certificate with Private Key from a Java KeyStore

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Load a Chilkat certificate object from a Java KeyStore.

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#include <C_CkJavaKeyStore.h>
#include <C_CkCertChain.h>
#include <C_CkCert.h>
#include <C_CkCrypt2.h>

void ChilkatSample(void)
    {
    HCkJavaKeyStore jks;
    const char *password;
    BOOL success;
    HCkCertChain chain;
    HCkCert cert;
    HCkCrypt2 crypt;

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

    // Most of the time a .jks contains one certificate with it's associated private key.
    // (Similar to how a .pfx/.p12 usually contains a particular certificate with private key.)
    // This example demonstrates how to get the certificate with private key such that it can be used
    // by other Chilkat classes wherever a cert w/ private key is needed.
    jks = CkJavaKeyStore_Create();
    password = "secret";
    success = CkJavaKeyStore_LoadFile(jks,password,"qa_data/jks/test_secret.jks");
    if (success != TRUE) {
        printf("%s\n",CkJavaKeyStore_lastErrorText(jks));
        CkJavaKeyStore_Dispose(jks);
        return;
    }

    // Make sure we have a private key.
    if (CkJavaKeyStore_getNumPrivateKeys(jks) < 1) {
        printf("No private key available.\n");
        CkJavaKeyStore_Dispose(jks);
        return;
    }

    // -------------------------------------------------------------------------
    // Get the certificate chain associated with the 1st (and probably only) private key in the JKS.
    chain = CkJavaKeyStore_GetCertChain(jks,0);
    if (CkJavaKeyStore_getLastMethodSuccess(jks) != TRUE) {
        printf("%s\n",CkJavaKeyStore_lastErrorText(jks));
        CkJavaKeyStore_Dispose(jks);
        return;
    }

    cert = CkCertChain_GetCert(chain,0);
    if (CkCertChain_getLastMethodSuccess(chain) != TRUE) {
        printf("%s\n",CkCertChain_lastErrorText(chain));
        CkCertChain_Dispose(chain);
        CkJavaKeyStore_Dispose(jks);
        return;
    }

    CkCertChain_Dispose(chain);

    // Verify again that this cert has a private key.
    if (CkCert_HasPrivateKey(cert) != TRUE) {
        printf("Certificate has no associated private key.\n");
        CkCert_Dispose(cert);
        CkJavaKeyStore_Dispose(jks);
        return;
    }

    // We now have the cert object with it's associated private key, and it can be used in other Chilkat classes where needed.
    // For example..

    crypt = CkCrypt2_Create();
    success = CkCrypt2_SetSigningCert(crypt,cert);
    if (success == FALSE) {
        printf("%s\n",CkCrypt2_lastErrorText(crypt));
        CkJavaKeyStore_Dispose(jks);
        CkCrypt2_Dispose(crypt);
        return;
    }

    // ...
    // ...

    CkCert_Dispose(cert);


    CkJavaKeyStore_Dispose(jks);
    CkCrypt2_Dispose(crypt);

    }