S/MIME Signed Message

Create an S/MIME signed (PKCS7) message.

<?php

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

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

$mime->AddHeaderField('Subject','This is a test');
$mime->AddHeaderField('Abc','123');

$mime->SetBodyFromPlainText('This is the body');

$cert = new COM("Chilkat.Cert");
//  Load a certificate that has already been installed (from a .pfx)
//  on the computer:
$success = $cert->LoadByEmailAddress('thawte@chilkatsoft.com');
if ($success == false) {
    print $cert->lastErrorText() . "\n";
    exit;
}

//  Convert to a signed message.
$success = $mime->ConvertToSigned($cert);
if ($success == false) {
    print $mime->lastErrorText() . "\n";
    exit;
}

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

print '----' . "\n";

//  Unwrap to restore the original MIME.
$success = $mime->UnwrapSecurity();
if ($success == false) {
    print $mime->lastErrorText() . "\n";
    exit;
}

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

?>