Perl

Create PKCS7 Attached/Opaque Signature (S/MIME)

See more MIME Examples

Create an S/MIME message with a PKCS7 attached/opaque signature. Perl

use chilkat();

$success = 0;

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

$mime = chilkat::CkMime->new();

# 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.
# Load a PFX file into a certificate object.
$cert = chilkat::CkCert->new();
$pfxFilepath = "pfxFiles/something.pfx";
$pfxPassword = "secret";
$success = $cert->LoadPfxFile($pfxFilepath,$pfxPassword);
if ($success == 0) {
    print $cert->lastErrorText() . "\r\n";
    exit;
}

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

# Examine the MIME prior to signing:
print "--- MIME prior to signing ---" . "\r\n";
print $mime->getMime() . "\r\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->put_SigningHashAlg("SHA256");

# Convert the MIME to PKCS7 signed-data.
$success = $mime->ConvertToSigned($cert);
if ($success == 0) {
    print $mime->lastErrorText() . "\r\n";
    exit;
}

# Examine the signed MIME
print "--- MIME converted to PKCS7 signed-data ---" . "\r\n";
print $mime->getMime() . "\r\n";

# The MIME after signing looks like this:
# -------------------------------------------------------------------------------

# Subject: This is a test
# MyCustomHeader: abc123
# Content-Disposition: attachment; filename="smime.p7m"
# Content-Transfer-Encoding: base64
# Content-Type: application/x-pkcs7-mime;
#  name="smime.p7m"; smime-type="signed-data"
# 
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# ------------------------------------------------------------------------------