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.

Download Chilkat Ruby Library

require 'chilkat'

cert = Chilkat::CkCert.new()

#  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 = cert.LoadByCommonName("Chilkat Software, Inc.")
if (success == false)
    print "Failed to find certificate!" + "\n"
else

    #  Get the PrivateKey object:

    pkey = cert.ExportPrivateKey()
    if (!(pkey == nil ))

        #  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:
        print "PKCS8 PEM Private Key:" + "\n";
        print pkey.getPkcs8Pem() + "\n";

        #  Get RSA PEM string:
        print "RSA PEM Private Key:" + "\n";
        print pkey.getRsaPem() + "\n";

    else
        print "No private key found!" + "\n"
    end

end

#  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.