(PHP Extension) Decrypt a .p7m File (using a PFX)

PHP Extension sample code showing how to decrypt a .p7m using a .p12 / .pfx certificate w/ private key.

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.

$crypt = new CkCrypt2();

// Use a digital certificate and private key from a PFX file (.pfx or .p12).
$pfxPath = 'myCertAndKey.pfx';
$pfxPassword = 'test123';

$success = $crypt->AddPfxSourceFile($pfxPath,$pfxPassword);
if ($success != true) {
    print $crypt->lastErrorText() . "\n";
    exit;
}

// Set the  outPath to whatever is appropriate.
// If you are decrypting a PDF, your output might be "out.pdf"...
$inPath = 'smime.p7m';
$outPath = 'original.txt';

// Indicate that we're doing public key decryption (i.e. PKCS7)
$crypt->put_CryptAlgorithm('pki');

$success = $crypt->CkDecryptFile($inPath,$outPath);
if ($success == false) {
    print $crypt->lastErrorText() . "\n";
    exit;
}

print 'Success.' . "\n";

?>