Export Public Key to RSA DER, OpenSSL DER/PEM, XML

Demonstrates how to export a digital certificate's public key to RSA DER, OpenSSL PEM or DER, or to XML format.

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// Needs #include <CkCert.h>
// Needs #include <CkPublicKey.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 PublicKey object:
        CkPublicKey *pkey = 0;

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

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

            //  Export to an OpenSSL DER file:
            pkey->SaveOpenSslDerFile("pubkey_openssl.der");

            //  Export to an OpenSSL PEM file:
            pkey->SaveOpenSslPemFile("pubkey_openssl.pem");

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

            //  Get OpenSSL PEM string:
            strOut.append("OpenSSL PEM Public Key:");
            strOut.append("\r\n");
            strOut.append(pkey->GetOpenSslPem());
            strOut.append("\r\n");

        }
        else {
            strOut.append("No public 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());