Dart

Verify SOAP XML using a wsse:SecurityTokenReference

See more XML Digital Signatures Examples

This example verifies a SOAP XML Digital Signature where the KeyInfo in the XML Signature is a wsse:SecurityTokenReference to the X.509 certificate embedded elsewhere in the SOAP XML. Dart

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.

  // The SOAP XML with digital signature verified in this example is available at 
  // https://www.chilkatsoft.com/exampleData/signedSoapBinarySecurityToken.xml

  final signedSoapXmlUrl = 'https://www.chilkatsoft.com/exampleData/signedSoapBinarySecurityToken.xml';

  // First, let's get the signed SOAP XML..
  final http = CkHttp();
  final sbXml = CkStringBuilder();
  try {
    http.quickGetSb(signedSoapXmlUrl, sbXml);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // The signed XML downloaded from the above URL contains the following.
  // Note: Everything we need to verify the signature is already available within the signed XML.
  // The KeyInfo part of the Signature contains a reference to the wsse:BinarySecurityToken
  // For clarity, here is the KeyInfo section extracted from the Signature below:
  // 
  // <ds:KeyInfo><wsse:SecurityTokenReference><wsse:Reference URI="#x509cert00" ValueType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-x509-token-profile-1.0#X509" /></wsse:SecurityTokenReference></ds:KeyInfo>
  // 
  // Chilkat has the capability to automatically follow the SecurityTokenReference.  It will automatically locate the 
  // certificate contained in the wsse:BinarySecurityToken element (in this case identified by Id="x509cert00"), 
  // automatically extracts the public key from the base64 X.509 certificate, and uses it to verify the signature.

  // <?xml version="1.0" encoding="UTF8"?>
  // <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
  // <SOAP-ENV:Header>
  //  <wsse:Security xmlns:ds="http://www.w3.org/2000/09/xmldsig#"
  //                 xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd"
  //                 xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd"
  //                 xmlns:xenc="http://www.w3.org/2001/04/xmlenc#" SOAP-ENV:mustUnderstand="1">
  //  <wsse:BinarySecurityToken
  //                EncodingType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-soap-message-security-1.0#Base64Binary"
  //                ValueType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-x509-token-profile-1.0#X509"
  //                wsu:Id="x509cert00">MIIDg...</wsse:BinarySecurityToken>
  //  <ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#"><ds:SignedInfo><ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"><InclusiveNamespaces xmlns="http://www.w3.org/2001/10/xml-exc-c14n#" PrefixList="wsse SOAP-ENV"/></ds:CanonicalizationMethod><ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/><ds:Reference URI="#TheBody"><ds:Transforms><ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/></ds:Transforms><ds:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/><ds:DigestValue>VhsSnaEAFsY0OYegKQh99v9csXg=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>Ynp3H4rtzpXIh4TaVxkpEkS1bMCCu672aeCzUOzheNNfnpmLsCZz3+zQjMBbchPggCayC5ihpEdhRe3XvPXjPXXAgxDP4mic091QPmjHlmUcu8yqRKfxnPtD35nqaxDtCYw+jGIzj+ch094vA4RPCfY8JQnb1mpy1ZjjsMW8741CIh1epbsd/0bZt6tfINUQ37seg07yvLbCJZ/Zf+h8FlFryQk6lHTTeZl/GfQ9NlDBcShby3x8Hc1KwW++zFqEA7G783R9AYPYn3fWTOBhYk5gkgFc+HaPRLR/L0Bp7ZPbmOR/iZQ+HK4W672tTdN/R2GdN7/deV7QTp2DYK1Z8w==</ds:SignatureValue><ds:KeyInfo><wsse:SecurityTokenReference><wsse:Reference URI="#x509cert00" ValueType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-x509-token-profile-1.0#X509" /></wsse:SecurityTokenReference></ds:KeyInfo></ds:Signature></wsse:Security>
  // </SOAP-ENV:Header>
  // <SOAP-ENV:Body xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" wsu:Id="TheBody">
  //  <getVersion xmlns="http://msgsec.wssecfvt.ws.ibm.com"/>
  // </SOAP-ENV:Body>
  // </SOAP-ENV:Envelope>
  // 

  // To verify this signature, we simply load and verify:
  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('Signature verified!');
}