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Chilkat2-Python

Duplicate openssl pkcs12 –export –in certfile.cer –inkey certfile.key –out certfile.pfx

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How to create a PKCS12 (.p12 or .pfx) from a certificate file and private key file: Demonstrates how to duplicate this OpenSSL command:
Duplicate openssl pkcs12 –export –in certfile.cer –inkey certfile.key –out certfile.pfx

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Chilkat2-Python
import sys
import chilkat2

success = False

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

pkey = chilkat2.PrivateKey()

# Load the private key from the file.
success = pkey.LoadAnyFormatFile("certFile.key","")
if (success != True):
    print(pkey.LastErrorText)
    sys.exit()

cert = chilkat2.Cert()
# The LoadFromFile method auto-recognizes the format...
success = cert.LoadFromFile("certfile.cer")
if (success != True):
    print(cert.LastErrorText)
    sys.exit()

# We'll need a cert chain object to create the PKCS12, so get it
# from the cert.  

# certChain is a CkCertChain
certChain = cert.GetCertChain()
if (not cert.LastMethodSuccess):
    print(cert.LastErrorText)
    sys.exit()

# Create the PFX object, add the cert and private key, and write to a .pfx file.
pfx = chilkat2.Pfx()

# The cert(s) are automatically added in the call to AddPrivateKey
success = pfx.AddPrivateKey(pkey,certChain)
if (success != True):
    print(pfx.LastErrorText)
    sys.exit()

# Write the .pfx to a file.
password = "myPassword"
success = pfx.ToFile(password,"certfile.pfx")
if (success != True):
    print(pfx.LastErrorText)
    sys.exit()

print("Success.")