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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#include <C_CkCert.h>
#include <C_CkPrivateKey.h>

void ChilkatSample(void)
    {
    HCkCert cert;
    BOOL success;
    HCkPrivateKey pkey;

    cert = CkCert_Create();

    //  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:

    success = CkCert_LoadByCommonName(cert,"Chilkat Software, Inc.");
    if (success == FALSE) {
        printf("Failed to find certificate!\n");
    }
    else {

        //  Get the PrivateKey object:

        pkey = CkCert_ExportPrivateKey(cert);
        if (!(pkey == 0 )) {

            //  Export the private key to an RSA DER file:
            CkPrivateKey_SaveRsaDerFile(pkey,"pkey_rsa.der");

            //  Export to a PKCS8 DER file:
            CkPrivateKey_SavePkcs8File(pkey,"pkey_pkcs8.der");

            //  Export to an RSA PEM file:
            CkPrivateKey_SaveRsaPemFile(pkey,"pkey_rsa.pem");

            //  Export to a PKCS8 PEM file:
            CkPrivateKey_SavePkcs8PemFile(pkey,"pkey_pkcs8.pem");

            //  Export to XML:
            CkPrivateKey_SaveXmlFile(pkey,"pkey.xml");

            //  Get PKCS8 PEM string:
            printf("PKCS8 PEM Private Key:\n");
            printf("%s\n",CkPrivateKey_getPkcs8Pem(pkey));

            //  Get RSA PEM string:
            printf("RSA PEM Private Key:\n");
            printf("%s\n",CkPrivateKey_getRsaPem(pkey));

        }
        else {
            printf("No private key found!\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.


    CkCert_Dispose(cert);

    }