Export a Certificate's Private Key to Various Formats

Loads a digital certificate and private key from a PFX file (also known as PKCS#12) and exports the private key to various formats: (1) PKCS8 Encrypted, (2) PKCS8 Encrypted PEM, (3) PKCS8 unencrypted, (4) PKCS8 PEM unencrypted, (5) RSA DER unencrypted, (6) RSA PEM unencrypted, (7) XML.

Downloads for Windows/Linux and Install Instructions

require 'chilkat'

cert = Chilkat::CkCert.new()

#  Load from the PFX file
pfxFilename = "/Users/chilkat/testData/pfx/chilkat_ssl_pwd_is_test.pfx"
pfxPassword = "test"

#  A PFX typically contains certificates in the chain of authentication.
#  The Chilkat cert object will choose the certificate w/
#  private key farthest from the root authority cert.
#  To access all the certificates in a PFX, use the
#  Chilkat certificate store object instead.
success = cert.LoadPfxFile(pfxFilename,pfxPassword)
if (success != true)
    print cert.lastErrorText() + "\n";
    exit
end

#  Get the private key...

# privKey is a CkPrivateKey
privKey = cert.ExportPrivateKey()
if (privKey == nil )
    print cert.lastErrorText() + "\n";
    exit
end

#  Export to various formats:

password = "secret"

#  PKCS8 Encrypted DER
path = "/Users/chilkat/testData/privkeys/chilkat_pkcs8_enc.der"
success = privKey.SavePkcs8EncryptedFile(password,path)
if (success != true)
    print privKey.lastErrorText() + "\n";

    exit
end

#  PKCS8 Encrypted PEM
path = "/Users/chilkat/testData/privkeys/chilkat_pkcs8_enc.pem"
success = privKey.SavePkcs8EncryptedPemFile(password,path)
if (success != true)
    print privKey.lastErrorText() + "\n";

    exit
end

#  PKCS8 Unencrypted DER
path = "/Users/chilkat/testData/privkeys/chilkat_pkcs8.der"
success = privKey.SavePkcs8File(path)
if (success != true)
    print privKey.lastErrorText() + "\n";

    exit
end

#  PKCS8 Unencrypted PEM
path = "/Users/chilkat/testData/privkeys/chilkat_pkcs8.pem"
success = privKey.SavePkcs8PemFile(path)
if (success != true)
    print privKey.lastErrorText() + "\n";

    exit
end

#   RSA DER (unencrypted)
path = "/Users/chilkat/testData/privkeys/chilkat_rsa.der"
success = privKey.SaveRsaDerFile(path)
if (success != true)
    print privKey.lastErrorText() + "\n";

    exit
end

#  RSA PEM (unencrypted)
path = "/Users/chilkat/testData/privkeys/chilkat_rsa.pem"
success = privKey.SaveRsaPemFile(path)
if (success != true)
    print privKey.lastErrorText() + "\n";

    exit
end

#  XML (unencrypted)
path = "/Users/chilkat/testData/privkeys/chilkat.xml"
success = privKey.SaveXmlFile(path)
if (success != true)
    print privKey.lastErrorText() + "\n";

    exit
end

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