(Perl) Working with PEM Encrypted Private Keys

Demonstrates how to load and save PEM encrypted private keys.

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux

use chilkat();

$success = 0;

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

$success = 0;

$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 == 0) {
    print $pem->lastErrorText() . "\r\n";
    exit;
}

$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 == 0) {
    print $pem->lastErrorText() . "\r\n";
    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.")) . "\r\n";
    exit;
}

$privKey = chilkat::CkPrivateKey->new();
for ($i = 1; $i <= $numPrivateKeys; $i++) {
    $pem->PrivateKeyAt($i - 1,$privKey);
    print $i . ": " . $privKey->get_BitLength() . " bits" . "\r\n";
}