Export Digital Certificate's Public Key

The ExportPublicKey method can be called to get a certificate's public key. It can then be saved to any of a number of formats: (1) OpenSSL DER, (2) OpenSSL PEM, (3) RSA DER, (4) XML.

Downloads for Windows/Linux and Install Instructions

require 'chilkat'

cert = Chilkat::CkCert.new()

#  LoadFromFile will load virtually any certificate format file.
#  It will auto-recognize the format and load appropiately.
success = cert.LoadFromFile("/Users/chilkat/testData/cer/chilkat.cer")
if (success != true)
    print cert.lastErrorText() + "\n";
    exit
end

#  Get the public key:

# pubkey is a CkPublicKey
pubkey = cert.ExportPublicKey()
if (pubkey == nil )
    print cert.lastErrorText() + "\n";
    exit
end

#  Save to various formats:
success = pubkey.SaveOpenSslDerFile("/Users/chilkat/testData/pubkeys/chilkat_openSsl.der")
if (success != true)
    print pubkey.lastErrorText() + "\n";

    exit
end

success = pubkey.SaveOpenSslPemFile("/Users/chilkat/testData/pubkeys/chilkat_openSsl.pem")
if (success != true)
    print pubkey.lastErrorText() + "\n";

    exit
end

success = pubkey.SaveRsaDerFile("/Users/chilkat/testData/pubkeys/chilkat_rsa.der")
if (success != true)
    print pubkey.lastErrorText() + "\n";

    exit
end

success = pubkey.SaveXmlFile("/Users/chilkat/testData/pubkeys/chilkat.xml")
if (success != true)
    print pubkey.lastErrorText() + "\n";

    exit
end

print "Public key exported to all file formats." + "\n";