PHP ActiveX 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. PHP ActiveX

<?php

$success = 0;

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

$success = 0;

$pem = new COM("Chilkat.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 == 0) {
    print $pem->LastErrorText . "\n";
    exit;
}

$fac = new COM("Chilkat.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 == 0) {
    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 = $pem->NumPrivateKeys;
if ($numPrivateKeys == 0) {
    print (('Error: Expected the PEM to contain private keys.')) . "\n";
    exit;
}

$privKey = new COM("Chilkat.PrivateKey");
for ($i = 1; $i <= $numPrivateKeys; $i++) {
    $pem->PrivateKeyAt($i - 1,$privKey);
    print $i . ': ' . $privKey->BitLength . ' bits' . "\n";
}


?>