Create PKCS7 Detached Signature (S/MIME)

Create an S/MIME message with a PKCS7 detached signature.

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;
}

//  Load a certificate w/ private key for signing.
//  There are many ways of getting a certificate object:
//  from a pfx file, from .cer and private-key files, from the
//  Windows registry-based certificate stores, etc.
//  For this example, we'll use a pre-installed cert from
//  a certificate store.
$cert = new COM("Chilkat.Cert");
$success = $cert->LoadByCommonName('Chilkat Software, Inc.');
if ($success == false) {
    print $cert->lastErrorText() . "\n";
    exit;
}

//  Create a very simple MIME message to be signed:
$mime->AddHeaderField('Subject','This is a test');
$mime->AddHeaderField('MyCustomHeader','abc123');
$mime->ContentType = 'text/plain';
$mime->SetBody('This is a plain-text body.');

//  Examine the MIME prior to signing:
print '--- MIME prior to signing ---' . "\n";
print $mime->getMime() . "\n";

//  The MIME prior to signing looks like this:
//  -------------------------------------------------------------------------------
//  
Subject: This is a test
MyCustomHeader: abc123
Content-Type: text/plain

This is a plain-text body.
//  -------------------------------------------------------------------------------

//  The default hash algorithm used in the signing process is "SHA1".
//  To change it, set the SigningHashAlg property:
$mime->SigningHashAlg = 'SHA256';

//  Add a detached signature:
$success = $mime->AddDetachedSignature($cert);
if ($success == false) {
    print $mime->lastErrorText() . "\n";
    exit;
}

//  Examine the MIME with detached signature:
print '--- MIME with detached signature ---' . "\n";
print $mime->getMime() . "\n";

//  The MIME after signing looks like this:
//  -------------------------------------------------------------------------------
//  
Content-Type: multipart/signed;
 boundary="----=_NextPart_a66_7f43_247e22d0.a03166d5";
 protocol="application/x-pkcs7-signature"; micalg="sha256"

This is a multi-part message in MIME format.

------=_NextPart_a66_7f43_247e22d0.a03166d5
Subject: This is a test
MyCustomHeader: abc123
Content-Type: text/plain

This is a plain-text body.
------=_NextPart_a66_7f43_247e22d0.a03166d5
Content-Transfer-Encoding: base64
Content-Type: application/x-pkcs7-signature;
 name="smime.p7s"
Content-Disposition: attachment; filename="smime.p7s"

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------=_NextPart_a66_7f43_247e22d0.a03166d5--
//  -------------------------------------------------------------------------------

?>