Dart
Dart
XML Signature Multiple External References
See more XML Digital Signatures Examples
Demonstrates how to add multiple external references to an XML digital signature.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.
// This example creates the following signed XML with multiple external references:
// <?xml version="1.0" encoding="UTF-8"?>
// <ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#" Id="xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4">
// <ds:SignedInfo>
// <ds:CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/>
// <ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/>
// <ds:Reference Id="xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-ref0" URI="https://isus.ezdrowie.gov.pl/fhir/Patient/123/_history/456">
// <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
// <ds:DigestValue>...</ds:DigestValue>
// </ds:Reference>
// <ds:Reference Id="xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-ref1" URI="https://isus.ezdrowie.gov.pl/fhir/Encounter/124/_history/22">
// <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
// <ds:DigestValue>...</ds:DigestValue>
// </ds:Reference>
// <ds:Reference Id="xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-ref2" URI="https://isus.ezdrowie.gov.pl/fhir/Condition/125/_history/1">
// <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
// <ds:DigestValue>...</ds:DigestValue>
// </ds:Reference>
// <ds:Reference Id="xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-ref3" URI="https://isus.ezdrowie.gov.pl/fhir/Procedure/126/_history/1">
// <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
// <ds:DigestValue>...</ds:DigestValue>
// </ds:Reference>
// <ds:Reference Type="http://uri.etsi.org/01903#SignedProperties" URI="#xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-signedprops">
// <ds:Transforms>
// <ds:Transform Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/>
// </ds:Transforms>
// <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
// <ds:DigestValue>...</ds:DigestValue>
// </ds:Reference>
// </ds:SignedInfo>
// <ds:SignatureValue Id="xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-sigvalue">...</ds:SignatureValue>
// <ds:KeyInfo>
// <ds:X509Data>
// <ds:X509Certificate>...</ds:X509Certificate>
// <ds:X509SubjectName>...</ds:X509SubjectName>
// <ds:X509IssuerSerial>
// <ds:X509IssuerName>...</ds:X509IssuerName>
// <ds:X509SerialNumber>...</ds:X509SerialNumber>
// </ds:X509IssuerSerial>
// </ds:X509Data>
// </ds:KeyInfo>
// <ds:Object>
// <xades:QualifyingProperties xmlns:xades="http://uri.etsi.org/01903/v1.3.2#" xmlns:xades141="http://uri.etsi.org/01903/v1.4.1#" Target="#xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4">
// <xades:SignedProperties Id="xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-signedprops">
// <xades:SignedSignatureProperties>
// <xades:SigningTime>2021-06-02T07:10:13.306+02:00</xades:SigningTime>
// <xades:SigningCertificate>
// <xades:Cert>
// <xades:CertDigest>
// <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
// <ds:DigestValue>...</ds:DigestValue>
// </xades:CertDigest>
// <xades:IssuerSerial>
// <ds:X509IssuerName>...</ds:X509IssuerName>
// <ds:X509SerialNumber>...</ds:X509SerialNumber>
// </xades:IssuerSerial>
// </xades:Cert>
// <xades:Cert>
// <xades:CertDigest>
// <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
// <ds:DigestValue>...</ds:DigestValue>
// </xades:CertDigest>
// <xades:IssuerSerial>
// <ds:X509IssuerName>...</ds:X509IssuerName>
// <ds:X509SerialNumber>...</ds:X509SerialNumber>
// </xades:IssuerSerial>
// </xades:Cert>
// <xades:Cert>
// <xades:CertDigest>
// <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
// <ds:DigestValue>...</ds:DigestValue>
// </xades:CertDigest>
// <xades:IssuerSerial>
// <ds:X509IssuerName>...</ds:X509IssuerName>
// <ds:X509SerialNumber>...</ds:X509SerialNumber>
// </xades:IssuerSerial>
// </xades:Cert>
// </xades:SigningCertificate>
// </xades:SignedSignatureProperties>
// </xades:SignedProperties>
// </xades:QualifyingProperties>
// </ds:Object>
// </ds:Signature>
//
final gen = CkXmlDSigGen();
gen.sigLocation = '';
gen.sigLocationMod = 0;
// Note: ID's simply need to be unique values in the signed XML document. They don't necessarily need to be GUID/UUID formatted.
gen.sigId = 'xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4';
gen.sigNamespacePrefix = 'ds';
gen.sigNamespaceUri = 'http://www.w3.org/2000/09/xmldsig#';
gen.sigValueId = 'xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-sigvalue';
gen.signedInfoCanonAlg = 'C14N';
gen.signedInfoDigestMethod = 'sha256';
// Create an Object to be added to the Signature.
final object1 = CkXml();
object1.tag = 'xades:QualifyingProperties';
object1.addAttribute('xmlns:xades', 'http://uri.etsi.org/01903/v1.3.2#');
object1.addAttribute('xmlns:xades141', 'http://uri.etsi.org/01903/v1.4.1#');
object1.addAttribute('Target', '#xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4');
object1.updateAttrAt('xades:SignedProperties', true, 'Id', 'xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-signedprops');
object1.updateChildContent('xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningTime', 'TO BE GENERATED BY CHILKAT');
// This assumes there are 3 certs in the certificate chain: The signing certificate, an intermediate root, and the root CA.
// Remove the lines with "Cert[2]" if there is no intermediate root...
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');
gen.addObject('', object1.getXml(), '', '');
final http = CkHttp();
final bd = CkBinData();
var url = 'https://isus.ezdrowie.gov.pl/fhir/Patient/123/_history/456';
try {
http.quickGetBd(url, bd);
} on ChilkatException catch (e) {
print(e.lastErrorText);
return;
}
// -------- Reference 1 --------
gen.addExternalBinaryRef(url, bd, 'sha256', '');
gen.setRefIdAttr(url, 'xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-ref0');
// -------- Reference 2 --------
bd.clear();
url = 'https://isus.ezdrowie.gov.pl/fhir/Encounter/789/_history/1';
try {
http.quickGetBd(url, bd);
} on ChilkatException catch (e) {
print(e.lastErrorText);
return;
}
gen.addExternalBinaryRef(url, bd, 'sha256', '');
gen.setRefIdAttr(url, 'xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-ref1');
// -------- Reference 3 --------
bd.clear();
url = 'https://isus.ezdrowie.gov.pl/fhir/Condition/123456/_history/1';
try {
http.quickGetBd(url, bd);
} on ChilkatException catch (e) {
print(e.lastErrorText);
return;
}
gen.addExternalBinaryRef(url, bd, 'sha256', '');
gen.setRefIdAttr(url, 'xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-ref2');
// -------- Reference 4 --------
bd.clear();
url = 'https://isus.ezdrowie.gov.pl/fhir/Procedure/123456/_history/1';
try {
http.quickGetBd(url, bd);
} on ChilkatException catch (e) {
print(e.lastErrorText);
return;
}
gen.addExternalBinaryRef(url, bd, 'sha256', '');
gen.setRefIdAttr(url, 'xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-ref3');
// -------- Reference 5 --------
gen.addObjectRef('xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-signedprops', 'sha256', 'C14N', '', 'http://uri.etsi.org/01903#SignedProperties');
// 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 = 'IssuerSerial,SubjectName,Certificate';
// This will be an enveloping signature where the Signature element
// is the XML document root, the signed data is contained within Object
// tag(s) within the Signature.
// Therefore, pass an empty sbXml to CreateXmlDsigSb.
final sbXml = CkStringBuilder();
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 signature we just produced...
final verifier = CkXmlDSig();
try {
verifier.loadSignatureSb(sbXml);
} on ChilkatException catch (e) {
print(e.lastErrorText);
return;
}
try {
verifier.verifySignature(true);
} on ChilkatException catch (e) {
print(e.lastErrorText);
return;
}
print('This signature was successfully verified.');
}