(PHP using ActiveX) Extract a File from a .p7m (PKCS7 Signed-Data)

PHP example to extract the original file from a .p7m (Signed-Data PKCS7 Format) The .p7m contains the signed contents of the original file. It can be verified and restored by calling VerifyP7M.

Download Chilkat Crypt ActiveX

<?php

$crypt = new COM("Chilkat.Crypt2");

//  Any string argument automatically begins the 30-day trial.
$success = $crypt->UnlockComponent('30-day trial');
if ($success != 1) {
    print $crypt->lastErrorText() . "\n";
    exit;
}

$outFile = '/Users/chilkat/testData/pdf/sample.pdf';
$inFile = '/Users/chilkat/testData/p7m/sample.pdf.p7m';

//  Verify and restore the original file:
$success = $crypt->VerifyP7M($inFile,$outFile);
if ($success == 0) {
    print $crypt->lastErrorText() . "\n";
    exit;
}

print 'Success!' . "\n";
?>