CkPython

Working with PEM Encrypted Private Keys

See more PEM Examples

Demonstrates how to load and save PEM encrypted private keys. CkPython

import sys
import chilkat

success = False

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

success = False

pem = chilkat.CkPem()

pemPassword = "secret"

# To load a PEM file containing encrypted private keys, simply
# provide the password.
success = pem.LoadPemFile("/Users/chilkat/testData/pem/pemContainingEncryptedPrivateKeys.pem",pemPassword)
if (success == False):
    print(pem.lastErrorText())
    sys.exit()

fac = chilkat.CkFileAccess()
pemText = fac.readEntireTextFile("/Users/chilkat/testData/pem/pemContainingEncryptedPrivateKeys.pem",pemPassword)

# To load a PEM from a string, call LoadPem instead of LoadPemFile:
success = pem.LoadPem(pemText)
if (success == False):
    print(pem.lastErrorText())
    sys.exit()

# A few notes:
# The PEM may contain both private keys and certificates (or anything else).
# The password is utilized for whatever content in the PEM is encrypted.  
# It is OK to have both encrypted and non-encrypted content within a given PEM.

# PEM private keys can be encrypted in different formats.  The LoadPem and LoadPemFile
# methods automatically handle the different formats.
# One format is PKCS8 and is indicated by this delimiter within the PEM:

# -----BEGIN ENCRYPTED PRIVATE KEY-----
# MIICoTAbBgkqhkiG9w0BBQMwDgQIfdD0zv24lgkCAggABIICgE0PdHJmRbNs6cBX
# ...

# Another format, we'll call "passphrase" looks like this in the PEM:
# -----BEGIN RSA PRIVATE KEY-----
# Proc-Type: 4,ENCRYPTED
# DEK-Info: DES-EDE3-CBC,A4215544D11C5D0C
# 
# paqy9XRexcSjurHfG0xhCaUD0HrvIdhuC0CbRxxxeMlkLaV6+uT80rBxt2AaibWG
# ...

# Show the bit length of each private key:

numPrivateKeys = pem.get_NumPrivateKeys()
if (numPrivateKeys == 0):
    print(("Error: Expected the PEM to contain private keys."))
    sys.exit()

privKey = chilkat.CkPrivateKey()
for i in range(1,(numPrivateKeys)-1):
    pem.PrivateKeyAt(i - 1,privKey)
    print(str(i) + ": " + str(privKey.get_BitLength()) + " bits")