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(PHP ActiveX) Working with PEM Encrypted Private Keys

Demonstrates how to load and save PEM encrypted private keys.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?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 COM("Chilkat_9_5_0.Global");
$success = $chilkatGlob->UnlockBundle('Anything for 30-day trial.');
if ($success != 1) {
    print $chilkatGlob->LastErrorText . "\n";
    exit;
}

$pem = new COM("Chilkat_9_5_0.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 != 1) {
    print $pem->LastErrorText . "\n";
    exit;
}

$fac = new COM("Chilkat_9_5_0.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 != 1) {
    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;
}

for ($i = 1; $i <= $numPrivateKeys; $i++) {
    // privKey is a Chilkat_9_5_0.PrivateKey
    $privKey = $pem->GetPrivateKey($i - 1);
    print $i . ': ' . $privKey->BitLength . ' bits' . "\n";

}


?>

 

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