Dart
Dart
XML-DSig Add Reference with Transforms Specified Explicitly
Demonstrates how to use the new AddSameDocRef2 method to explicitly specify the XML Transforms fragment.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.
// Create the following XML to be signed:
// <doc>
// <s id="s1">Some text...</s>
// <p>Some text...</p>
// <p class="note">A note...</p>
// </doc>
// Use this online tool to generate code from sample XML:
// Generate Code to Create XML
final xmlToSign = CkXml();
xmlToSign.tag = 'doc';
xmlToSign.updateAttrAt('s', true, 'id', 's1');
xmlToSign.updateChildContent('s', 'Some text...');
xmlToSign.updateChildContent('p', 'Some text...');
xmlToSign.updateAttrAt('p[1]', true, 'class', 'note');
xmlToSign.updateChildContent('p[1]', 'A note...');
print(xmlToSign.getXml());
final gen = CkXmlDSigGen();
gen.sigLocation = 'doc';
gen.sigLocationMod = 0;
gen.sigId = 'Signature-78f29839-06af-448f-b479-ca46457fab1b-Signature';
gen.sigNamespacePrefix = 'ds';
gen.sigNamespaceUri = 'http://www.w3.org/2000/09/xmldsig#';
gen.sigValueId = 'Signature-78f29839-06af-448f-b479-ca46457fab1b-SignatureValue';
gen.signedInfoCanonAlg = 'C14N';
gen.signedInfoDigestMethod = 'sha1';
// Set the KeyInfoId before adding references..
gen.keyInfoId = 'Signature-78f29839-06af-448f-b479-ca46457fab1b-KeyInfo';
// The following XML to be added as an Object to the Signature
// Use this online tool to generate code from sample XML:
// Generate Code to Create XML
// <xades:QualifyingProperties Id="Signature-78f29839-06af-448f-b479-ca46457fab1b-QualifyingProperties" Target="#Signature-78f29839-06af-448f-b479-ca46457fab1b-Signature" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:xades="http://uri.etsi.org/01903/v1.3.2#">
// <xades:SignedProperties Id="Signature-78f29839-06af-448f-b479-ca46457fab1b-SignedProperties">
// <xades:SignedSignatureProperties>
// <xades:SigningTime>TO BE GENERATED BY CHILKAT</xades:SigningTime>
// <xades:SigningCertificate>
// <xades:Cert>
// <xades:CertDigest>
// <ds:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
// <ds:DigestValue>TO BE GENERATED BY CHILKAT</ds:DigestValue>
// </xades:CertDigest>
// <xades:IssuerSerial>
// <ds:X509IssuerName>TO BE GENERATED BY CHILKAT</ds:X509IssuerName>
// <ds:X509SerialNumber>TO BE GENERATED BY CHILKAT</ds:X509SerialNumber>
// </xades:IssuerSerial>
// </xades:Cert>
// </xades:SigningCertificate>
// </xades:SignedSignatureProperties>
// <xades:SignedDataObjectProperties>
// <xades:DataObjectFormat ObjectReference="#Reference-24eb6003-d41c-442c-a731-d4c58f94790b">
// <xades:Description/>
// <xades:ObjectIdentifier>
// <xades:Identifier Qualifier="OIDAsURN">urn:oid:1.2.840.10003.5.109.10</xades:Identifier>
// <xades:Description/>
// </xades:ObjectIdentifier>
// <xades:MimeType>text/xml</xades:MimeType>
// <xades:Encoding/>
// </xades:DataObjectFormat>
// </xades:SignedDataObjectProperties>
// </xades:SignedProperties>
// </xades:QualifyingProperties>
final object1 = CkXml();
object1.tag = 'xades:QualifyingProperties';
object1.addAttribute('Id', 'Signature-78f29839-06af-448f-b479-ca46457fab1b-QualifyingProperties');
object1.addAttribute('Target', '#Signature-78f29839-06af-448f-b479-ca46457fab1b-Signature');
object1.addAttribute('xmlns:ds', 'http://www.w3.org/2000/09/xmldsig#');
object1.addAttribute('xmlns:xades', 'http://uri.etsi.org/01903/v1.3.2#');
object1.updateAttrAt('xades:SignedProperties', true, 'Id', 'Signature-78f29839-06af-448f-b479-ca46457fab1b-SignedProperties');
object1.updateChildContent('xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningTime', 'TO BE GENERATED BY CHILKAT');
// Note: It may be that http://www.w3.org/2001/04/xmlenc#sha256 is needed in the following line instead of http://www.w3.org/2000/09/xmldsig#sha1
object1.updateAttrAt('xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificateV2|xades:Cert|xades:CertDigest|ds:DigestMethod', true, 'Algorithm', 'http://www.w3.org/2000/09/xmldsig#sha1');
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');
object1.updateAttrAt('xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat', true, 'ObjectReference', '#Reference-24eb6003-d41c-442c-a731-d4c58f94790b');
object1.updateChildContent('xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:Description', '');
object1.updateAttrAt('xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:ObjectIdentifier|xades:Identifier', true, 'Qualifier', 'OIDAsURN');
object1.updateChildContent('xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:ObjectIdentifier|xades:Identifier', 'urn:oid:1.2.840.10003.5.109.10');
object1.updateChildContent('xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:ObjectIdentifier|xades:Description', '');
object1.updateChildContent('xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:MimeType', 'text/xml');
object1.updateChildContent('xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:Encoding', '');
print(object1.getXml());
gen.addObject('', object1.getXml(), '', '');
// -------- Reference 1 --------
// Create the following Transforms fragment:
// Use this online tool to generate code from sample XML:
// Generate Code to Create XML
// <ds:Transforms>
// <ds:Transform Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/>
// <ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
// <ds:Transform Algorithm="http://www.w3.org/TR/1999/REC-xpath-19991116">
// <ds:XPath xmlns:ds="http://www.w3.org/2000/09/xmldsig#">not(ancestor-or-self::ds:Signature)</ds:XPath>
// </ds:Transform>
// </ds:Transforms>
final xml1 = CkXml();
xml1.tag = 'ds:Transforms';
xml1.updateAttrAt('ds:Transform', true, 'Algorithm', 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315');
xml1.updateAttrAt('ds:Transform[1]', true, 'Algorithm', 'http://www.w3.org/2000/09/xmldsig#enveloped-signature');
xml1.updateAttrAt('ds:Transform[2]', true, 'Algorithm', 'http://www.w3.org/TR/1999/REC-xpath-19991116');
xml1.updateAttrAt('ds:Transform[2]|ds:XPath', true, 'xmlns:ds', 'http://www.w3.org/2000/09/xmldsig#');
xml1.updateChildContent('ds:Transform[2]|ds:XPath', 'not(ancestor-or-self::ds:Signature)');
// This is the "Transforms" XML fragment passed to AddSameDocRef2.
print(xml1.getXml());
gen.addSameDocRef2('', 'sha1', xml1, '');
gen.setRefIdAttr('', 'Reference-24eb6003-d41c-442c-a731-d4c58f94790b');
// -------- Reference 2 --------
gen.addObjectRef('Signature-78f29839-06af-448f-b479-ca46457fab1b-SignedProperties', 'sha1', '', '', 'http://uri.etsi.org/01903#SignedProperties');
// -------- Reference 3 --------
gen.addSameDocRef('Signature-78f29839-06af-448f-b479-ca46457fab1b-KeyInfo', 'sha1', '', '', '');
// 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+KeyValue';
gen.x509Type = 'CertChain';
// Load XML to be signed...
final sbXml = CkStringBuilder();
xmlToSign.getXmlSb(sbXml);
gen.behaviors = 'IndentedSignature';
// Sign the XML...
try {
gen.createXmlDSigSb(sbXml);
} on ChilkatException catch (e) {
print(e.lastErrorText);
return;
}
// -----------------------------------------------
// Save the signed XML to a file.
sbXml.writeFile('qa_output/signedXml.xml', 'utf-8', false);
print(sbXml.getAsString());
// ----------------------------------------
// Verify the signatures we just produced...
final verifier = CkXmlDSig();
try {
verifier.loadSignatureSb(sbXml);
} on ChilkatException catch (e) {
print(e.lastErrorText);
return;
}
final numSigs = verifier.numSignatures;
var verifyIdx = 0;
while (verifyIdx < numSigs) {
verifier.selector = verifyIdx;
try {
verifier.verifySignature(true);
} on ChilkatException catch (e) {
print(e.lastErrorText);
return;
}
verifyIdx++;
}
print('All signatures were successfully verified.');
}