(Ruby) Working with PEM Encrypted Private Keys

Demonstrates how to load and save PEM encrypted private keys.

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

# 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 = Chilkat::CkGlobal.new()
success = chilkatGlob.UnlockBundle("Anything for 30-day trial.")
if (success != true)
    print chilkatGlob.lastErrorText() + "\n";
    exit
end

pem = Chilkat::CkPem.new()

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() + "\n";
    exit
end

fac = Chilkat::CkFileAccess.new()
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() + "\n";
    exit
end

# 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.")) + "\n";
    exit
end

for i in 1 .. numPrivateKeys
    # privKey is a CkPrivateKey
    privKey = pem.GetPrivateKey(i - 1)
    print i.to_s() + ": " + privKey.get_BitLength().to_s() + " bits" + "\n";

end