(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.

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import sys
import chilkat

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 != True):
    print(cert.lastErrorText())
    sys.exit()

# Get the public key:

# pubkey is a CkPublicKey
pubkey = cert.ExportPublicKey()
if (cert.get_LastMethodSuccess() == False):
    print(cert.lastErrorText())
    sys.exit()

# 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.")