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.

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

FreeBSD C++ Libraries

HP-UX C++ Libraries

BlackBerry QNX C++ Libraries

// Needs #include <CkCert.h>
// Needs #include <CkPublicKey.h>

    CkString strOut;

    CkCert cert;

    bool success;

    //  LoadFromFile will load virtually any certificate format file.
    //  It will auto-recognize the format and load appropiately.
    success = cert.LoadFromFile("/Users/chilkat/testData/cer/chilkat.cer");
    if (success != true) {
        strOut.append(cert.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

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

    pubkey = cert.ExportPublicKey();
    if (pubkey == 0 ) {
        strOut.append(cert.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  Save to various formats:
    success = pubkey->SaveOpenSslDerFile("/Users/chilkat/testData/pubkeys/chilkat_openSsl.der");
    if (success != true) {
        strOut.append(pubkey->lastErrorText());
        strOut.append("\r\n");
        delete pubkey;
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    success = pubkey->SaveOpenSslPemFile("/Users/chilkat/testData/pubkeys/chilkat_openSsl.pem");
    if (success != true) {
        strOut.append(pubkey->lastErrorText());
        strOut.append("\r\n");
        delete pubkey;
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    success = pubkey->SaveRsaDerFile("/Users/chilkat/testData/pubkeys/chilkat_rsa.der");
    if (success != true) {
        strOut.append(pubkey->lastErrorText());
        strOut.append("\r\n");
        delete pubkey;
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    success = pubkey->SaveXmlFile("/Users/chilkat/testData/pubkeys/chilkat.xml");
    if (success != true) {
        strOut.append(pubkey->lastErrorText());
        strOut.append("\r\n");
        delete pubkey;
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    delete pubkey;
    strOut.append("Public key exported to all file formats.");
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());