(Perl) Sign MIME using RSASSA-PSS with SHA256

Demonstrates how to sign an MIME using the RSASSA-PSS signing algorithm with the SHA256 hash algorithm.

Note: This example requires Chilkat v9.5.0.67 or greater.

Chilkat Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux, Solaris

use chilkat();

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

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

# Create a MIME message to sign.
$mime->NewMultipartMixed();
$mime->AddHeaderField("someHeader1","Some value 1");
$mime->AddHeaderField("someHeader2","Some value 2");

$part0 = chilkat::CkMime->new();
$part0->AddHeaderField("hdrA","Some value A");
$part0->AddHeaderField("hdrB","Some value B");
$part0->put_ContentType("text/plain");
$part0->SetBody("This is the plain-text body.");

$part1 = chilkat::CkMime->new();
$part1->AddHeaderField("hdrX","Some value X");
$part1->AddHeaderField("hdrY","Some value Y");
$part1->put_ContentType("text/xml");
$part1->SetBody("<a>This is the XML body</a>");

$mime->AppendPart($part0);
$mime->AppendPart($part1);

# The MIME to be signed:
$sbUnsignedMime = chilkat::CkStringBuilder->new();
$mime->GetMimeSb($sbUnsignedMime);
print $sbUnsignedMime->getAsString() . "\r\n";

# 	Content-Type: multipart/mixed; boundary="------------080303020600020604010008"
# 	someHeader1: Some value 1
# 	someHeader2: Some value 2
# 
# 	--------------080303020600020604010008
# 	hdrA: Some value A
# 	hdrB: Some value B
# 	Content-Type: text/plain
# 
# 	This is the plain-text body.
# 	--------------080303020600020604010008
# 	hdrX: Some value X
# 	hdrY: Some value Y
# 	Content-Type: text/xml
# 
# 	<a>This is the XML body</a>
# 	--------------080303020600020604010008--
# 

# Get a digital certificate with private key from a .pfx
# (Chilkat has many different ways to provide a cert + private key for siging.
# Using a PFX is just one possible option.)
$pfx = chilkat::CkPfx->new();
$success = $pfx->LoadPfxFile("qa_data/rsassa-pss/privatekey.pfx","PFX_PASSWORD");
if ($success != 1) {
    print $pfx->lastErrorText() . "\r\n";
    exit;
}

# Get the certificate to be used for signing.
# (The typical case for a PFX is that it contains a cert with an associated private key,
# as well as other certificates in the chain of authentication.  The cert with the private
# key should be in the first position at index 0.)
# cert is a Cert
$cert = $pfx->GetCert(0);
if ($pfx->get_LastMethodSuccess() != 1) {
    print $pfx->lastErrorText() . "\r\n";
    exit;
}

# Indicate that RSASSA-PSS with SHA256 should be used.
$mime->put_SigningAlg("pss");
$mime->put_SigningHashAlg("sha256");

# Add a detached signature.
$success = $mime->AddDetachedSignature($cert);
if ($success != 1) {
    print $mime->lastErrorText() . "\r\n";

    exit;
}

# Show the clear-signed MIME. (see the sample output below)
print "-------------------------------------------------------------" . "\r\n";
print "Clear-signed MIME using detached signature:" . "\r\n";
print "-------------------------------------------------------------" . "\r\n";
print $mime->getMime() . "\r\n";

# Restore the original unsigned MIME, and this time create an opaque signature.
$mime->LoadMime($sbUnsignedMime->getAsString());

# Sign using an opaque signature
$success = $mime->ConvertToSigned($cert);
if ($success != 1) {
    print $mime->lastErrorText() . "\r\n";

    exit;
}

# Show the opaque-signed MIME. (see the sample output below)
print "-------------------------------------------------------------" . "\r\n";
print "Opaque-signed MIME :" . "\r\n";
print "-------------------------------------------------------------" . "\r\n";
print $mime->getMime() . "\r\n";

print "Success." . "\r\n";

# -----------------------------------------------
# This is sample output for the clear-signed MIME:
# -----------------------------------------------
# 
# 	Content-Type: multipart/signed; boundary="----=_NextPart_672_c95a_97b64c9a.90b5204d";
# 	 protocol="application/x-pkcs7-signature";
# 	 micalg=sha256
# 
# 	------=_NextPart_672_c95a_97b64c9a.90b5204d
# 	Content-Type: multipart/mixed; boundary="------------030207090102000301050504"
# 	someHeader1: Some value 1
# 	someHeader2: Some value 2
# 
# 	--------------030207090102000301050504
# 	hdrA: Some value A
# 	hdrB: Some value B
# 	Content-Type: text/plain
# 
# 	This is the plain-text body.
# 	--------------030207090102000301050504
# 	hdrX: Some value X
# 	hdrY: Some value Y
# 	Content-Type: text/xml
# 
# 	<a>This is the XML body</a>
# 	--------------030207090102000301050504--
# 
# 	------=_NextPart_672_c95a_97b64c9a.90b5204d
# 	Content-Transfer-Encoding: base64
# 	Content-Type: application/x-pkcs7-signature; name="smime.p7s"
# 	Content-Disposition: attachment; filename="smime.p7s"
# 
# 	MIIG5wYJKoZIhvcNAQcCoIIG2DCCBtQCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg
# 	ggL4MIIC9DCCAl2gAwIBAgIJAMPsJCT11cniMA0GCSqGSIb3DQEBCwUAMIGSMQswCQYDVQQGEwJB
# 	VTERMA8GA1UECAwIVmljdG9yaWExEjAQBgNVBAcMCU1lbGJvdXJuZTEhMB8GA1UECgwYSW50ZXJu
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# 	neC8qw==
# 
# 	------=_NextPart_672_c95a_97b64c9a.90b5204d--
# 

# -----------------------------------------------
# This is sample output for the opaque-signed MIME:
# -----------------------------------------------
# 	Content-Type: application/x-pkcs7-mime; name="smime.p7m"; smime-type="signed-data"
# 	someHeader1: Some value 1
# 	someHeader2: Some value 2
# 	Content-Disposition: attachment; filename="smime.p7m"
# 	Content-Transfer-Encoding: base64
# 
# 	MIIItAYJKoZIhvcNAQcCoIIIpTCCCKECAQExDzANBglghkgBZQMEAgEFADCCAdYGCSqGSIb3DQEH
# 	AaCCAccEggHDQ29udGVudC1UeXBlOiBtdWx0aXBhcnQvbWl4ZWQ7IGJvdW5kYXJ5PSItLS0tLS0t
# 	LS0tLS0wMDA2MDcwNzA3MDcwMTA1MDAwMTA5MDciDQpzb21lSGVhZGVyMTogU29tZSB2YWx1ZSAx
# 	DQpzb21lSGVhZGVyMjogU29tZSB2YWx1ZSAyDQoNCi0tLS0tLS0tLS0tLS0tMDAwNjA3MDcwNzA3
# 	MDEwNTAwMDEwOTA3DQpoZHJBOiBTb21lIHZhbHVlIEENCmhkckI6IFNvbWUgdmFsdWUgQg0KQ29u
# 	dGVudC1UeXBlOiB0ZXh0L3BsYWluDQoNClRoaXMgaXMgdGhlIHBsYWluLXRleHQgYm9keS4NCi0t
# 	LS0tLS0tLS0tLS0tMDAwNjA3MDcwNzA3MDEwNTAwMDEwOTA3DQpoZHJYOiBTb21lIHZhbHVlIFgN
# 	Cmhkclk6IFNvbWUgdmFsdWUgWQ0KQ29udGVudC1UeXBlOiB0ZXh0L3htbA0KDQo8YT5UaGlzIGlz
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#