Dart Requires Chilkat v11.0.0+
Dart
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 Dart Downloads
import 'package:chilkat/chilkat.dart';
void main() {
// This requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
final mime = CkMime();
// Create a MIME message to sign.
mime.newMultipartMixed();
mime.addHeaderField('someHeader1', 'Some value 1');
mime.addHeaderField('someHeader2', 'Some value 2');
final part0 = CkMime();
part0.addHeaderField('hdrA', 'Some value A');
part0.addHeaderField('hdrB', 'Some value B');
part0.contentType = 'text/plain';
part0.setBody('This is the plain-text body.');
final part1 = CkMime();
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:
final sbUnsignedMime = CkStringBuilder();
mime.getMimeSb(sbUnsignedMime);
print(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.)
final pfx = CkPfx();
try {
pfx.loadPfxFile('qa_data/rsassa-pss/privatekey.pfx', 'PFX_PASSWORD');
} on ChilkatException catch (e) {
print(e.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.)
final cert = CkCert();
try {
pfx.certAt(0, cert);
} on ChilkatException catch (e) {
print(e.lastErrorText);
return;
}
// Indicate that RSASSA-PSS with SHA256 should be used.
mime.signingAlg = 'pss';
mime.signingHashAlg = 'sha256';
// Add a detached signature.
try {
mime.addDetachedSignature(cert);
} on ChilkatException catch (e) {
print(e.lastErrorText);
return;
}
// Show the clear-signed MIME. (see the sample output below)
print('-------------------------------------------------------------');
print('Clear-signed MIME using detached signature:');
print('-------------------------------------------------------------');
print(mime.getMime());
// Restore the original unsigned MIME, and this time create an opaque signature.
mime.loadMime(sbUnsignedMime.getAsString());
// Sign using an opaque signature
try {
mime.convertToSigned(cert);
} on ChilkatException catch (e) {
print(e.lastErrorText);
return;
}
// Show the opaque-signed MIME. (see the sample output below)
print('-------------------------------------------------------------');
print('Opaque-signed MIME :');
print('-------------------------------------------------------------');
print(mime.getMime());
print('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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// Cmhkclk6IFNvbWUgdmFsdWUgWQ0KQ29udGVudC1UeXBlOiB0ZXh0L3htbA0KDQo8YT5UaGlzIGlz
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//
}