Export Private Key to PKCS8, PEM, DER, XML

Demonstrates how to export a digital certificate's private key to RSA PEM or DER, PKCS8 PEM or DER, or XML.

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

    CkString strOut;

    CkCert cert;

    //  Th LoadByCommonName method searches the Windows
    //  Current User Certificate Store and Local Machine Certificate
    //  Store for a certificate whose common name (CN) matches
    //  the argument:
    bool success;
    success = cert.LoadByCommonName("Chilkat Software, Inc.");
    if (success == false) {
        strOut.append("Failed to find certificate!\r\n");
    }
    else {

        //  Get the PrivateKey object:
        CkPrivateKey *pkey = 0;

        pkey = cert.ExportPrivateKey();
        if (!(pkey == 0 )) {

            //  Export the private key to an RSA DER file:
            pkey->SaveRsaDerFile("pkey_rsa.der");

            //  Export to a PKCS8 DER file:
            pkey->SavePkcs8File("pkey_pkcs8.der");

            //  Export to an RSA PEM file:
            pkey->SaveRsaPemFile("pkey_rsa.pem");

            //  Export to a PKCS8 PEM file:
            pkey->SavePkcs8PemFile("pkey_pkcs8.pem");

            //  Export to XML:
            pkey->SaveXmlFile("pkey.xml");

            //  Get PKCS8 PEM string:
            strOut.append("PKCS8 PEM Private Key:");
            strOut.append("\r\n");
            strOut.append(pkey->GetPkcs8Pem());
            strOut.append("\r\n");

            //  Get RSA PEM string:
            strOut.append("RSA PEM Private Key:");
            strOut.append("\r\n");
            strOut.append(pkey->GetRsaPem());
            strOut.append("\r\n");

        }
        else {
            strOut.append("No private key found!\r\n");
        }

    }

    //  The Chilkat Certificate, Certificate Store, Private Key,
    //  Public Key, and Key Container classes / objects are freeware.

    //  They are used by and included with the Chilkat Email,
    //  Crypt, S/MIME, and other commercial Chilkat components.


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());