Chilkat2-Python

PKCS11 Certificate Chain

See more PKCS11 Examples

Demonstrates how to make CA certs available for the certificate chain to be included when creating a signature (using a PKCS11 compatible smart card / USB token) such as for PDF, XMLDSig, etc.

Note: This example requires Chilkat v9.5.0.88 or later.

Chilkat2-Python

import sys
import chilkat2

success = False

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

# Note: Chilkat's PKCS11 implementation runs on Windows, Linux, Mac OS X, and other supported operating systems.

pkcs11 = chilkat2.Pkcs11()

# You will use the DLL (or shared lib) provided by your smart card vendor, or a DLL compatible with your smart card.
# On Windows, if the DLL is located in C:\Windows\System32, specify only the filename.
# Otherwise provide the full path.
pkcs11.SharedLibPath = "bit4xpki.dll"

success = pkcs11.Initialize()
if (success == False):
    print(pkcs11.LastErrorText)
    sys.exit()

# Pass -1 for the slotID to open a session on the first non-empty slot.
slotID = -1

# Open a session.
readWrite = True
success = pkcs11.OpenSession(slotID,readWrite)
if (success == False):
    print(pkcs11.LastErrorText)
    sys.exit()

# Make it an authenticated session by calling Login.
userType = 1
# Make sure to use the correct PIN for your smart card..
pin = "0000"
success = pkcs11.Login(userType,pin)
if (success == False):
    print(pkcs11.LastErrorText)
    success = pkcs11.CloseSession()
    sys.exit()

# Get the certificate (on the smart card) that has a private key.
cert = chilkat2.Cert()
success = pkcs11.FindCert("privateKey","",cert)
if (success == True):
    print("Cert with private key: " + cert.SubjectCN)
else:
    print("No certificates having a private key were found.")
    success = pkcs11.CloseSession()
    sys.exit()

# If the certificates in the chain of authentication were contained on the smart card,
# then Chilkat would already have them (via the FindCert function) and the certs in the chain will be automatically used
# as needed when signing occurs.

# If you have CA certs located elsewhere, such as in .cer files, you can make them available to Chilkat in the following way:

certVault = chilkat2.XmlCertVault()
# Please review the methods available in the XML certificate vault class.  Different methods exist for adding certificates
# from various sources, such as PEM, PFX, or in-memory sources..
success = certVault.AddCertFile("someDir/caIntermediateCert.cer")
# ...
success = certVault.AddCertFile("someDir/caCert.cer")
# (Your code should check the return value to make sure it succeeded.)

success = cert.UseCertVault(certVault)
if (success == False):
    print(cert.LastErrorText)
    success = pkcs11.CloseSession()
    sys.exit()

# --------------------------------------------------------------------------
# At this point, we have the cert (and certs in the chain of authentication) to be used for signing.
# The code for using the certificate in creating the digital signature, such as for a PDF, XML, etc., go here...

# --------------------------------------------------------------------------

# Revert to an unauthenticated session by calling Logout.
success = pkcs11.Logout()
if (success == False):
    print(pkcs11.LastErrorText)
    success = pkcs11.CloseSession()
    sys.exit()

# When finished, close the session.
# It is important to close the session (memory leaks will occur if the session is not properly closed).
success = pkcs11.CloseSession()
if (success == False):
    print(pkcs11.LastErrorText)
    sys.exit()

print("Success.")