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.

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 PublicKey object:

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

        #  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:
        print "OpenSSL PEM Public Key:" + "\n";
        print pkey.getOpenSslPem() + "\n";

    else
        print "No public 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.