CkPython Requires Chilkat v11.0.0+

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")