(PHP Extension) Duplicate OpensSSL Command that Decrypts Binary DER

This example duplicates the following:

openssl smime -decrypt -in INPUT_FILE -inform der -binary -out OUTPUT_FILE -recip PEM_CERT_AND_KEY -passin pass:PRIVKEY_PASSWORD

Note: Although "smime" is the OpenSSL command, we're not really dealing with S/MIME. The arguments "-inform der -binary" indicate that the input is simply the binary DER (i.e. the PKCS7 binary encrypted object). The output can be any type of file (whatever was encrypted).

Note: This example requires Chilkat v11.0.0 or greater.

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

<?php

include("chilkat.php");

$success = false;

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

$crypt = new CkCrypt2();

$crypt->put_CryptAlgorithm('pki');

$pem = new CkPem();
$success = $pem->LoadPemFile('qa_data/pem/myPem.pem','password');
if ($success == false) {
    print $pem->lastErrorText() . "\n";
    exit;
}

$privkey = new CkPrivateKey();
$success = $pem->PrivateKeyAt(0,$privkey);
if ($success == false) {
    print $pem->lastErrorText() . "\n";
    exit;
}

$cert = new CkCert();
$success = $pem->CertAt(0,$cert);
if ($success == false) {
    print $pem->lastErrorText() . "\n";
    exit;
}

$success = $crypt->SetDecryptCert2($cert,$privkey);
if ($success == false) {
    print $crypt->lastErrorText() . "\n";
    exit;
}

$success = $crypt->CkDecryptFile('qa_data/infile.enc','qa_output/outfile.dat');
if ($success == false) {
    print $crypt->lastErrorText() . "\n";
    exit;
}

print 'Success.' . "\n";

?>