C#
C#
Sign MIME using RSASSA-PSS with SHA256
See more MIME Examples
Demonstrates how to sign an MIME using the RSASSA-PSS signing algorithm with the SHA256 hash algorithm.Chilkat C# Downloads
bool success = false;
// This requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
Chilkat.Mime mime = new Chilkat.Mime();
// Create a MIME message to sign.
mime.NewMultipartMixed();
mime.AddHeaderField("someHeader1","Some value 1");
mime.AddHeaderField("someHeader2","Some value 2");
Chilkat.Mime part0 = new 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.");
Chilkat.Mime part1 = new 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:
Chilkat.StringBuilder sbUnsignedMime = new Chilkat.StringBuilder();
mime.GetMimeSb(sbUnsignedMime);
Debug.WriteLine(sbUnsignedMime.GetAsString());
// 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.)
Chilkat.Pfx pfx = new Chilkat.Pfx();
success = pfx.LoadPfxFile("qa_data/rsassa-pss/privatekey.pfx","PFX_PASSWORD");
if (success == false) {
Debug.WriteLine(pfx.LastErrorText);
return;
}
// 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.)
Chilkat.Cert cert = new Chilkat.Cert();
success = pfx.CertAt(0,cert);
if (success == false) {
Debug.WriteLine(pfx.LastErrorText);
return;
}
// 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 != true) {
Debug.WriteLine(mime.LastErrorText);
return;
}
// Show the clear-signed MIME. (see the sample output below)
Debug.WriteLine("-------------------------------------------------------------");
Debug.WriteLine("Clear-signed MIME using detached signature:");
Debug.WriteLine("-------------------------------------------------------------");
Debug.WriteLine(mime.GetMime());
// 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 != true) {
Debug.WriteLine(mime.LastErrorText);
return;
}
// Show the opaque-signed MIME. (see the sample output below)
Debug.WriteLine("-------------------------------------------------------------");
Debug.WriteLine("Opaque-signed MIME :");
Debug.WriteLine("-------------------------------------------------------------");
Debug.WriteLine(mime.GetMime());
Debug.WriteLine("Success.");
// -----------------------------------------------
// 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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// 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
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//