Chilkat2-Python

Convert Let's Encrypt PEM Files to a PFX

See more PFX/P12 Examples

Demonstrates how to convert the .pem files provided by Let's Encrypt to a single PFX. 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.

# Let's Encrypt provides four .pem files
# 1. fullchain.pem
# 2. privkey.pem
# 3. cert.pem
# 4. chain.pem

# The cert.pem and chain.pem are redundant. 
# The fullchain.pem is composed of the cert.pem and chain.pem.

# To convert the PEM's to a single .pfx, we don't need the redundant data.
# The privkey.pem and fullchain.pem provide the required data.
# We can ignore cert.pem and chain.pem (because those certs are already found in fullchain.pem).

# We need a single .pem file that contains both the private key, the cert,
# and the certs in the chain of authentication.
# Let's combine priveky.pem and fullchain.pem into a single .pem

sbPem = chilkat2.StringBuilder()
success = sbPem.LoadFile("qa_data/pem/lets_encrypt/privkey.pem","utf-8")
if (success == False):
    print("Failed to load privkey.pem")
    sys.exit()

# To be safe, append a blank line..
sbPem.AppendLine("",False)

sbFullChainPem = chilkat2.StringBuilder()
success = sbFullChainPem.LoadFile("qa_data/pem/lets_encrypt/fullchain.pem","utf-8")
if (success == False):
    print("Failed to load fullchain.pem")
    sys.exit()

# Append the full cert chain PEM to the private key PEM.
sbPem.AppendSb(sbFullChainPem)

# Load the combined PEM into a Chilkat PFX object.
pfx = chilkat2.Pfx()
success = pfx.LoadPem(sbPem.GetAsString(),"no password required")
if (success == False):
    print(pfx.LastErrorText)
    sys.exit()

# Write the PFX w/ a password.
pfxPassword = "secret"
success = pfx.ToFile(pfxPassword,"qa_output/sample.pfx")
if (success == False):
    print(pfx.LastErrorText)
    sys.exit()

print("Success!")