PKCS7 Encrypt using Multiple Certificates

Encrypts MIME using multiple digital certificates. Calls AddEncryptCert once per certificate, followed by a call to EncryptN. The MIME may be decrypted by any owner of one of the certificates + its associated private key.

Download Chilkat MIME ActiveX

<?php


$mime = new COM("Chilkat.Mime");

$success = $mime->UnlockComponent('Anything for 30-day trial.');
if ($success == false) {
    print $mime->lastErrorText() . "\n";
    exit;
}

//  Build a simple MIME message to be encrypted:
$mime->AddHeaderField('Content-Type','text/plain');
$mime->AddHeaderField('abc','123');
$mime->SetBody('This is a test');

//  A digital certificate is required to create PKCS7 encrypted MIME.
//  It can come from a variety of sources: .cer file, .pfx file, PEM files,
//  an in-memory representation, or directly from a Windows
//  registry-based certificate store.

//  Load one cert from a .cer file:
$cert1 = new COM("Chilkat.Cert");
$success = $cert1->LoadFromFile('myCert.cer');
if ($success == false) {
    print $cert1->lastErrorText() . "\n";
    exit;
}

//  Load another cert from the Windows registry store:
$cert2 = new COM("Chilkat.Cert");
$success = $cert2->LoadByCommonName('Chilkat Sales');
if ($success == false) {
    print $cert2->lastErrorText() . "\n";
    exit;
}

//  Tell the MIME object to use these certs for encrypting:
//  (AddEncryptCert shouldn't fail if we already know it contains
//  a valid certificate..)
$success = $mime->AddEncryptCert($cert1);
$success = $mime->AddEncryptCert($cert2);

//  Encrypt the MIME:
$success = $mime->EncryptN();
if ($success == false) {
    print $mime->lastErrorText() . "\n";
    exit;
}

//  Display the MIME:
print $mime->getMime() . "\n";

//  The resulting S/MIME looks something like this:
//  
abc: 123
Content-Disposition: attachment; filename="smime.p7m"
Content-Transfer-Encoding: base64
Content-Type: application/x-pkcs7-mime;
 name="smime.p7m"

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?>