(CkPython) 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.

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()

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

# Get the public key:
pubkey = chilkat.CkPublicKey()
cert.GetPublicKey(pubkey)

# Save to various formats:
success = pubkey.SaveDerFile(False,"/Users/chilkat/testData/pubkeys/chilkat_pkcs8.der")
if (success != True):
    print(pubkey.lastErrorText())
    sys.exit()

success = pubkey.SavePemFile(False,"/Users/chilkat/testData/pubkeys/chilkat.pem")
if (success != True):
    print(pubkey.lastErrorText())
    sys.exit()

success = pubkey.SaveDerFile(True,"/Users/chilkat/testData/pubkeys/chilkat_pkcs1.der")
if (success != True):
    print(pubkey.lastErrorText())
    sys.exit()

success = pubkey.SaveXmlFile("/Users/chilkat/testData/pubkeys/chilkat.xml")
if (success != True):
    print(pubkey.lastErrorText())
    sys.exit()

print("Public key exported to all file formats.")