(Chilkat2-Python) Working with PEM Encrypted Private Keys

Demonstrates how to load and save PEM encrypted private keys.

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import sys
import chilkat2

# Starting in v9.5.0.49, all Chilkat classes can be unlocked at once at the beginning of a program
# by calling UnlockBundle.  It requires a Bundle unlock code.
chilkatGlob = chilkat2.Global()
success = chilkatGlob.UnlockBundle("Anything for 30-day trial.")
if (success != True):
    print(chilkatGlob.LastErrorText)
    sys.exit()

pem = chilkat2.Pem()

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 != True):
    print(pem.LastErrorText)
    sys.exit()

fac = chilkat2.FileAccess()
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 != True):
    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.NumPrivateKeys
if (numPrivateKeys == 0):
    print(("Error: Expected the PEM to contain private keys."))
    sys.exit()

for i in range(1,(numPrivateKeys)-1):
    # privKey is a CkPrivateKey
    privKey = pem.GetPrivateKey(i - 1)
    print(str(i) + ": " + str(privKey.BitLength) + " bits")