(PHP Extension) Duplicate openssl smime -encrypt -binary -aes-256-cbc -in some_file.dat -out some_file.dat.enc -outform DER cert.crt

Demonstrates how to encrypt to binary DER using 256-bit AES (CBC mode) as the underlying symmetric encryption algorithm, to produce PKCS7 enveloped data (binary DER).

Duplicates the following openssl command:

openssl smime -encrypt -binary -aes-256-cbc -in some_file.dat -out some_file.dat.enc -outform DER cert.crt

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");

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

$cert = new CkCert();
$success = $cert->LoadFromFile('qa_data/openssl/EE.cer');
if ($success == false) {
    print $cert->lastErrorText() . "\n";
    exit;
}

$bd = new CkBinData();
$success = $bd->LoadFile('qa_data/openssl/hello.txt');
// Assuming success..

$crypt = new CkCrypt2();
$success = $crypt->SetEncryptCert($cert);
if ($success == false) {
    print $crypt->lastErrorText() . "\n";
    exit;
}

$crypt->put_CryptAlgorithm('PKI');

// Indicate the underlying symmetric encryption to be used:
$crypt->put_Pkcs7CryptAlg('aes');
$crypt->put_KeyLength(256);
$crypt->put_CipherMode('cbc');

$success = $crypt->CkEncryptFile('qa_data/openssl/hello.txt','qa_output/hello.txt.enc');
if ($success == false) {
    print $crypt->lastErrorText() . "\n";
    exit;
}

print 'Success.' . "\n";

?>