(Unicode C++) Export Digital Certificate's Public Key

The ExportPublicKey method can be called to get a certificate's public key. It can then be saved to any of a number of formats: (1) OpenSSL DER, (2) OpenSSL PEM, (3) RSA DER, (4) XML.

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#include <CkCertW.h>
#include <CkPublicKeyW.h>

void ChilkatSample(void)
    {
    CkCertW cert;

    // LoadFromFile will load virtually any certificate format file.
    // It will auto-recognize the format and load appropiately.
    bool success = cert.LoadFromFile(L"/Users/chilkat/testData/cer/chilkat.cer");
    if (success != true) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    // Get the public key:
    CkPublicKeyW *pubkey = 0;

    pubkey = cert.ExportPublicKey();
    if (cert.get_LastMethodSuccess() == false) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    // Save to various formats:
    success = pubkey->SaveDerFile(false,L"/Users/chilkat/testData/pubkeys/chilkat_pkcs8.der");
    if (success != true) {
        wprintf(L"%s\n",pubkey->lastErrorText());
        delete pubkey;
        return;
    }

    success = pubkey->SavePemFile(false,L"/Users/chilkat/testData/pubkeys/chilkat.pem");
    if (success != true) {
        wprintf(L"%s\n",pubkey->lastErrorText());
        delete pubkey;
        return;
    }

    success = pubkey->SaveDerFile(true,L"/Users/chilkat/testData/pubkeys/chilkat_pkcs1.der");
    if (success != true) {
        wprintf(L"%s\n",pubkey->lastErrorText());
        delete pubkey;
        return;
    }

    success = pubkey->SaveXmlFile(L"/Users/chilkat/testData/pubkeys/chilkat.xml");
    if (success != true) {
        wprintf(L"%s\n",pubkey->lastErrorText());
        delete pubkey;
        return;
    }

    delete pubkey;
    wprintf(L"Public key exported to all file formats.\n");
    }