(Android™) XML-DSig Add Reference with Transforms Specified Explicitly

Demonstrates how to use the new AddSameDocRef2 method to explicitly specify the XML Transforms fragment.

Chilkat Android™ Downloads Android™ Java Libraries Android C/C++ Libraries

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    boolean success = true;

    // 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

    CkXml xmlToSign = new CkXml();
    xmlToSign.put_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...");

    Log.i(TAG, xmlToSign.getXml());

    CkXmlDSigGen gen = new CkXmlDSigGen();

    gen.put_SigLocation("doc");
    gen.put_SigLocationMod(0);
    gen.put_SigId("Signature-78f29839-06af-448f-b479-ca46457fab1b-Signature");
    gen.put_SigNamespacePrefix("ds");
    gen.put_SigNamespaceUri("http://www.w3.org/2000/09/xmldsig#");
    gen.put_SigValueId("Signature-78f29839-06af-448f-b479-ca46457fab1b-SignatureValue");
    gen.put_SignedInfoCanonAlg("C14N");
    gen.put_SignedInfoDigestMethod("sha1");

    // Set the KeyInfoId before adding references..
    gen.put_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>

    CkXml object1 = new CkXml();
    object1.put_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","");

    Log.i(TAG, 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>

    CkXml xml1 = new CkXml();
    xml1.put_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.
    Log.i(TAG, 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)
    CkCert cert = new CkCert();
    success = cert.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123");
    if (success != true) {
        Log.i(TAG, cert.lastErrorText());
        return;
        }

    gen.SetX509Cert(cert,true);

    gen.put_KeyInfoType("X509Data+KeyValue");
    gen.put_X509Type("CertChain");

    // Load XML to be signed...
    CkStringBuilder sbXml = new CkStringBuilder();
    xmlToSign.GetXmlSb(sbXml);

    gen.put_Behaviors("IndentedSignature");

    // Sign the XML...
    success = gen.CreateXmlDSigSb(sbXml);
    if (success != true) {
        Log.i(TAG, gen.lastErrorText());
        return;
        }

    // -----------------------------------------------

    // Save the signed XML to a file.
    success = sbXml.WriteFile("qa_output/signedXml.xml","utf-8",false);

    Log.i(TAG, sbXml.getAsString());

    // ----------------------------------------
    // Verify the signatures we just produced...
    CkXmlDSig verifier = new CkXmlDSig();
    success = verifier.LoadSignatureSb(sbXml);
    if (success != true) {
        Log.i(TAG, verifier.lastErrorText());
        return;
        }

    int numSigs = verifier.get_NumSignatures();
    int verifyIdx = 0;
    while (verifyIdx < numSigs) {
        verifier.put_Selector(verifyIdx);
        boolean verified = verifier.VerifySignature(true);
        if (verified != true) {
            Log.i(TAG, verifier.lastErrorText());
            return;
            }

        verifyIdx = verifyIdx + 1;
        }

    Log.i(TAG, "All signatures were successfully verified.");

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}