(CkPython) 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.

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat Python Downloads install with pip pip3 install chilkat or download... Python Module for Windows, MacOS, Linux, Alpine Linux

import sys
import chilkat

success = False

cert = chilkat.CkCert()

# 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 == False):
    print(cert.lastErrorText())
    sys.exit()

# Get the private key...
privKey = chilkat.CkPrivateKey()
success = cert.GetPrivateKey(privKey)
if (success == False):
    print(cert.lastErrorText())
    sys.exit()

# 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 == False):
    print(privKey.lastErrorText())
    sys.exit()

# PKCS8 Encrypted PEM
path = "/Users/chilkat/testData/privkeys/chilkat_pkcs8_enc.pem"
success = privKey.SavePkcs8EncryptedPemFile(password,path)
if (success == False):
    print(privKey.lastErrorText())
    sys.exit()

# PKCS8 Unencrypted DER
path = "/Users/chilkat/testData/privkeys/chilkat_pkcs8.der"
success = privKey.SavePkcs8File(path)
if (success == False):
    print(privKey.lastErrorText())
    sys.exit()

# PKCS8 Unencrypted PEM
path = "/Users/chilkat/testData/privkeys/chilkat_pkcs8.pem"
success = privKey.SavePkcs8PemFile(path)
if (success == False):
    print(privKey.lastErrorText())
    sys.exit()

#  RSA DER (unencrypted)
path = "/Users/chilkat/testData/privkeys/chilkat_rsa.der"
success = privKey.SavePkcs1File(path)
if (success == False):
    print(privKey.lastErrorText())
    sys.exit()

# RSA PEM (unencrypted)
path = "/Users/chilkat/testData/privkeys/chilkat_rsa.pem"
success = privKey.SavePemFile(path)
if (success == False):
    print(privKey.lastErrorText())
    sys.exit()

# XML (unencrypted)
path = "/Users/chilkat/testData/privkeys/chilkat.xml"
success = privKey.SaveXmlFile(path)
if (success == False):
    print(privKey.lastErrorText())
    sys.exit()

print("Private key exported to various formats.")