(PHP Extension) Working with PEM Encrypted Private Keys

Demonstrates how to load and save PEM encrypted private keys.

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux, Solaris

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

// 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 = new CkGlobal();
$success = $chilkatGlob->UnlockBundle('Anything for 30-day trial.');
if ($success != true) {
    print $chilkatGlob->lastErrorText() . "\n";
    exit;
}

$pem = new 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 != true) {
    print $pem->lastErrorText() . "\n";
    exit;
}

$fac = new 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 != true) {
    print $pem->lastErrorText() . "\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.')) . "\n";
    exit;
}

for ($i = 1; $i <= $numPrivateKeys; $i++) {
    // privKey is a CkPrivateKey
    $privKey = $pem->GetPrivateKey($i - 1);
    print $i . ': ' . $privKey->get_BitLength() . ' bits' . "\n";

}


?>