PHP

Encrypt File using X.509 Certificate using AES in CBC Mode

See more Encryption Examples

Demonstrates how to encrypt a file using an X.509 Certificate's public key, where the underlying bulk encryption algorithm is 128-bit AES in CBC mode. (The underlying bulk encryption algorithm can be specified to be other algorithms/strengths.) Chilkat2 PHP

<?php

use Chilkat2\Cert;
use Chilkat2\Crypt2;

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

$crypt = new Crypt2();

// Use public-key cryptography for encryption.
$crypt->CryptAlgorithm = 'pki';

// Get an X.509 certificate to use for encrypting.
// Note: Chilkat provides many different ways of loading a certificate, from many different formats,
// or if on Windows, from the installed certificates on the system.
// This example simply loads a certificate from a file.
// Also, for encryption, only the public key is needed.  Digital certificates embed the public key
// within the X.509 format itself.  Therefore, if you have a certificate, you also have the public key.
$cert = new Cert();
try {
    $cert->LoadFromFile('qa_data/certs/testCert.cer');

    $crypt->SetEncryptCert($cert);

    // Indicate the underlying bulk encryption algorithm to be used:
    $crypt->Pkcs7CryptAlg = 'aes';
    $crypt->KeyLength = 128;

    // Note: When doing public-key encryption the underlying bulk symmetric cipher mode will always be CBC. (at least with Chilkat...)

    // There's one last option that could be set.  If is the RSA encryption encryption/padding scheme.
    // By default, RSAES_PKCS1-V1_5 is used.  If desired, the OaepPadding property could be set to true to
    // use RSAES_OAEP.  (We'll leave it set at the default value of false)
    $crypt->OaepPadding = false;

    // Everything is specified.  Now just encrypt...
    // The output is PKCS7 in binary DER format.
    $crypt->CkEncryptFile('qa_data/hamlet.xml', 'qa_output/hamlet.p7');
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo "Finished.\n";