Dart
Dart
XAdES using TSA Requiring Client Certificate
See more XML Digital Signatures Examples
Demonstrates how to create an XMLDSig (XAdES) signed document which includes an EncapsulatedTimestamp using a TSA (TimeStamp Authority) server requiring client certificate authentication. One such TSA is https://www3.postsignum.cz/TSS/TSS_crt/Chilkat Dart Downloads
import 'package:chilkat/chilkat.dart';
void main() {
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
// Load the XML to be signed. For example, the XML to be signed might contain something like this:
// <?xml version="1.0" encoding="utf-8"?>
// <TransakcniLogSystemu xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://nsess.public.cz/erms_trans/v_01_01" Id="Signature1">
// <TransLogInfo>
// <Identifikator>XYZ ABC</Identifikator>
// <DatumVzniku>2022-12-20T14:39:02.3625922+01:00</DatumVzniku>
// <DatumCasOd>2022-12-20T14:26:26.88</DatumCasOd>
// <DatumCasDo>2022-12-20T14:39:02.287</DatumCasDo>
// <Software>XYZ</Software>
// <VerzeSoftware>2.0.19.32</VerzeSoftware>
// </TransLogInfo>
// <Udalosti>
// <Udalost>
// <Poradi>1</Poradi>
// ...
// Load the XML to be signed from a file.
// (XML can be loaded from other source, such as a string variable.)
final sbXml = CkStringBuilder();
sbXml.loadFile('xmlToSign.xml', 'utf-8');
final gen = CkXmlDSigGen();
gen.sigLocation = 'TransakcniLogSystemu';
gen.sigLocationMod = 0;
gen.sigId = 'SignatureID-Signature1';
gen.sigNamespacePrefix = 'ds';
gen.sigNamespaceUri = 'http://www.w3.org/2000/09/xmldsig#';
gen.signedInfoCanonAlg = 'C14N';
gen.signedInfoDigestMethod = 'sha256';
// Set the KeyInfoId before adding references..
gen.keyInfoId = 'KeyInfoId-Signature-Signature1';
// Create an Object to be added to the Signature.
// Note: Chilkat will automatically fill in the values marked as "TO BE GENERATED BY CHILKAT" at the time of signing.
// The EncapsulatedTimestamp will be automatically generated.
final object1 = CkXml();
object1.tag = 'xades:QualifyingProperties';
object1.addAttribute('xmlns:xades', 'http://uri.etsi.org/01903/v1.3.2#');
object1.addAttribute('Target', '#Signature1');
object1.updateAttrAt('xades:SignedProperties', true, 'Id', 'SignedProperties-Signature-Signature1');
object1.updateChildContent('xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningTime', 'TO BE GENERATED BY CHILKAT');
object1.updateAttrAt('xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificateV2|xades:Cert|xades:CertDigest|ds:DigestMethod', true, 'Algorithm', 'http://www.w3.org/2001/04/xmlenc#sha256');
object1.updateChildContent('xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificateV2|xades:Cert|xades:CertDigest|ds:DigestValue', 'TO BE GENERATED BY CHILKAT');
object1.updateChildContent('xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificateV2|xades:Cert|xades:IssuerSerialV2', 'TO BE GENERATED BY CHILKAT');
// The EncapsulatedTimestamp will be included in the unsigned properties.
object1.updateAttrAt('xades:UnsignedProperties|xades:UnsignedSignatureProperties|xades:SignatureTimeStamp', true, 'Id', 'signature-timestamp-5561-8212-3316-5191');
object1.updateAttrAt('xades:UnsignedProperties|xades:UnsignedSignatureProperties|xades:SignatureTimeStamp|ds:CanonicalizationMethod', true, 'Algorithm', 'http://www.w3.org/2001/10/xml-exc-c14n#');
object1.updateAttrAt('xades:UnsignedProperties|xades:UnsignedSignatureProperties|xades:SignatureTimeStamp|xades:EncapsulatedTimeStamp', true, 'Encoding', 'http://uri.etsi.org/01903/v1.2.2#DER');
object1.updateChildContent('xades:UnsignedProperties|xades:UnsignedSignatureProperties|xades:SignatureTimeStamp|xades:EncapsulatedTimeStamp', 'TO BE GENERATED BY CHILKAT');
gen.addObject('XadesObjectId-Signature1', object1.getXml(), '', '');
// -------- Reference 1 --------
gen.addObjectRef('SignedProperties-Signature-Signature1', 'sha256', 'EXCL_C14N', '', 'http://uri.etsi.org/01903#SignedProperties');
// -------- Reference 2 --------
gen.addSameDocRef('KeyInfoId-Signature-Signature1', 'sha256', 'EXCL_C14N', '', '');
gen.setRefIdAttr('KeyInfoId-Signature-Signature1', 'ReferenceKeyInfo');
// -------- Reference 3 --------
gen.addSameDocRef('', 'sha256', 'EXCL_C14N', '', '');
gen.setRefIdAttr('', 'Reference-Signature1');
// Provide a certificate + private key. (PFX password is test123)
final cert = CkCert();
try {
cert.loadPfxFile('qa_data/pfx/cert_test123.pfx', 'test123');
} on ChilkatException catch (e) {
print(e.lastErrorText);
return;
}
gen.setX509Cert(cert, true);
gen.keyInfoType = 'X509Data';
gen.x509Type = 'Certificate';
gen.behaviors = 'IndentedSignature';
// -------------------------------------------------------------------------------------------
// To have the EncapsulatedTimeStamp automatically added...
// 1) Add the <xades:EncapsulatedTimeStamp Encoding="http://uri.etsi.org/01903/v1.2.2#DER">TO BE GENERATED BY CHILKAT</xades:EncapsulatedTimeStamp>
// to the unsigned properties. (This was accomplished in the above code.)
// 2) Specify the TSA URL (Timestamping Authority URL).
// Here we specify the TSA URL:
// -------------------------------------------------------------------------------------------
final jsonTsa = CkJsonObject();
jsonTsa.updateString('timestampToken.tsaUrl', 'https://www3.postsignum.cz/TSS/TSS_crt/');
jsonTsa.updateBool('timestampToken.requestTsaCert', true);
gen.setTsa(jsonTsa);
// -------------------------------------------------------------------------------------------
// In this case, the TSA requires client certificate authentication.
// To provide your client certificate, the application will instantiate a Chilkat HTTP object,
// then set it up with a SSL/TLS client certificate, and then tell the XmlDSigGen object
// to use the HTTP object for connections to the TSA server.
// -------------------------------------------------------------------------------------------
final http = CkHttp();
try {
http.setSslClientCertPfx('/home/bob/pfxFiles/myClientSideCertWithPrivateKey.pfx', 'pfxPassword');
} on ChilkatException catch (e) {
print(e.lastErrorText);
return;
}
// Tell the XmlDSigGen object to use the above HTTP object for TSA communications.
gen.setHttpObj(http);
// Sign the XML...
try {
gen.createXmlDSigSb(sbXml);
} on ChilkatException catch (e) {
print(e.lastErrorText);
return;
}
// -----------------------------------------------
// Save the signed XML to a file.
sbXml.writeFile('c:/temp/qa_output/signedXml.xml', 'utf-8', false);
print(sbXml.getAsString());
}