(PHP ActiveX) 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 ActiveX Downloads ActiveX for 32-bit and 64-bit Windows Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

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

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Mime')
$mime = new COM("Chilkat.Mime");

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

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Mime')
$part0 = new COM("Chilkat.Mime");
$part0->AddHeaderField('hdrA','Some value A');
$part0->AddHeaderField('hdrB','Some value B');
$part0->ContentType = 'text/plain';
$part0->SetBody('This is the plain-text body.');

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Mime')
$part1 = new COM("Chilkat.Mime");
$part1->AddHeaderField('hdrX','Some value X');
$part1->AddHeaderField('hdrY','Some value Y');
$part1->ContentType = 'text/xml';
$part1->SetBody('<a>This is the XML body</a>');

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

// The MIME to be signed:
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.StringBuilder')
$sbUnsignedMime = new COM("Chilkat.StringBuilder");
$mime->GetMimeSb($sbUnsignedMime);
print $sbUnsignedMime->getAsString() . "\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.)
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Pfx')
$pfx = new COM("Chilkat.Pfx");
$success = $pfx->LoadPfxFile('qa_data/rsassa-pss/privatekey.pfx','PFX_PASSWORD');
if ($success != 1) {
    print $pfx->LastErrorText . "\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 Chilkat.Cert
$cert = $pfx->GetCert(0);
if ($pfx->LastMethodSuccess != 1) {
    print $pfx->LastErrorText . "\n";
    exit;
}

// Indicate that RSASSA-PSS with SHA256 should be used.
$mime->SigningAlg = 'pss';
$mime->SigningHashAlg = 'sha256';

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

    exit;
}

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

    exit;
}

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

print 'Success.' . "\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
// 	ZXQgV2lkZ2l0cyBQdHkgTHRkMQ8wDQYDVQQDDAZXaWRnZXQxKDAmBgkqhkiG9w0BCQEWGWFkbWlu
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// 	FhlhZG1pbkBpbnRlcm5ldHdpZGdldHMuY29tAgkAw+wkJPXVyeIwPQYJKoZIhvcNAQEKMDCgDTAL
// 	BglghkgBZQMEAgGhGjAYBgkqhkiG9w0BAQgwCwYJYIZIAWUDBAIBogMCASAEgYAvqIqKBzNXyVbh
// 	TmaxdAc4d0ZTqWT6Na3C+DMO8owSKWy5FdGbJ2DLKm92qe/KLPTcj51vuwLUQb0Sw7r5Xknl+/6p
// 	Eqn2qe/6hgDn06vvzNofVAweOtSVJsBO7/cYYPc+pXZZ2BcpZDdf/9Ci56Yrlk7A72BeqPe47J3F
// 	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
// 	IHRoZSBYTUwgYm9keTwvYT4NCi0tLS0tLS0tLS0tLS0tMDAwNjA3MDcwNzA3MDEwNTAwMDEwOTA3
// 	LS0NCqCCAvgwggL0MIICXaADAgECAgkAw+wkJPXVyeIwDQYJKoZIhvcNAQELBQAwgZIxCzAJBgNV
// 	BAYTAkFVMREwDwYDVQQIDAhWaWN0b3JpYTESMBAGA1UEBwwJTWVsYm91cm5lMSEwHwYDVQQKDBhJ
// 	bnRlcm5ldCBXaWRnaXRzIFB0eSBMdGQxDzANBgNVBAMMBldpZGdldDEoMCYGCSqGSIb3DQEJARYZ
// 	YWRtaW5AaW50ZXJuZXR3aWRnZXRzLmNvbTAeFw0xNjExMDExNjUyMzJaFw0yMTEwMzExNjUyMzJa
// 	MIGSMQswCQYDVQQGEwJBVTERMA8GA1UECAwIVmljdG9yaWExEjAQBgNVBAcMCU1lbGJvdXJuZTEh
// 	MB8GA1UECgwYSW50ZXJuZXQgV2lkZ2l0cyBQdHkgTHRkMQ8wDQYDVQQDDAZXaWRnZXQxKDAmBgkq
// 	hkiG9w0BCQEWGWFkbWluQGludGVybmV0d2lkZ2V0cy5jb20wgZ8wDQYJKoZIhvcNAQEBBQADgY0A
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// 	+txDCzAfBgNVHSMEGDAWgBQ40oq7bOxciuKdbEgZPrni+txDCzAMBgNVHRMEBTADAQH/MA0GCSqG
// 	SIb3DQEBCwUAA4GBACsW92Lm72LZAXVDD5x0LWXvDZjf6rpEiSWfZbytYkWN7TTrjijyFfLu/jqC
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// 	/QTfrLOuzXKy
// 

?>