C++
C++
Signed Zip as Base64 with XAdES-BES
See more XAdES Examples
This example is to help companies implement a solution for sending XAdES-BES to the Polish government for reporting purposes. Specifically:Przed podpisaniem deklaracja zbiorcza (PIT-11Z, PIT-8CZ, PIT-40Z, PIT-RZ) musi zostać
umieszczona w archiwum ZIP. W tym przypadku, podpisywany jest plik archiwum ZIP,
przyjmujący w podpisie XAdES-BES formę zakodowaną base64.
The example demonstrates the following:
- Zip an XML file (PIT-11Z.xml is zipped to PIT-11Z.zip)
- Create XML to be signed, where the XML contains the base64 encoded content of the PIT-11Z.zip archive.
- XAdES-BES sign the XML containing the base64 zip.
This example will also show the reverse:
- Verify the signed XML.
- Extract the PIT-11z.zip from the signed XML.
- Unzip the PIT-11Z.zip to get the original PIT-11Z.xml
Chilkat C++ Downloads
#include <CkStringBuilder.h>
#include <CkZip.h>
#include <CkBinData.h>
#include <CkXmlDSigGen.h>
#include <CkXml.h>
#include <CkCert.h>
#include <CkXmlDSig.h>
#include <CkZipEntry.h>
void ChilkatSample(void)
{
bool success = false;
// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
// Zip the PIT-11Z.xml to create PIT-11Z.zip (not as a .zip file, but in-memory).
CkStringBuilder sbXmlToZip;
success = sbXmlToZip.LoadFile("qa_data/xml/PIT-11Z.xml","utf-8");
if (success != true) {
std::cout << "Failed to load the XML to be zipped." << "\r\n";
return;
}
CkZip zip;
// Initialize the zip object. No file is created in this call.
// It should always return true.
success = zip.NewZip("PIT-11Z.zip");
// Add the XML to be zipped.
zip.AddSb("PIT-11Z.xml",sbXmlToZip,"utf-8");
// Write the zip to a BinData object.
CkBinData bdZip;
zip.WriteBd(bdZip);
// The contents of the bdZip will be retrieved in base64 format when needed below..
CkXmlDSigGen gen;
gen.put_SigLocation("");
gen.put_SigLocationMod(0);
gen.put_SigId("Signature_2a8df7f8-b958-40cc-83f6-edb53b837347_19");
gen.put_SigNamespacePrefix("ds");
gen.put_SigNamespaceUri("http://www.w3.org/2000/09/xmldsig#");
gen.put_SigValueId("SignatureValue_2a8df7f8-b958-40cc-83f6-edb53b837347_52");
gen.put_SignedInfoId("SignedInfo_2a8df7f8-b958-40cc-83f6-edb53b837347_41");
gen.put_SignedInfoCanonAlg("C14N");
gen.put_SignedInfoDigestMethod("sha1");
// Set the KeyInfoId before adding references..
gen.put_KeyInfoId("KeyInfo_2a8df7f8-b958-40cc-83f6-edb53b837347_24");
// Create an Object to be added to the Signature.
CkXml object1;
object1.put_Tag("xades:QualifyingProperties");
object1.AddAttribute("xmlns:xades","http://uri.etsi.org/01903/v1.3.2#");
object1.AddAttribute("Id","QualifyingProperties_2a8df7f8-b958-40cc-83f6-edb53b837347_43");
object1.AddAttribute("Target","#Signature_2a8df7f8-b958-40cc-83f6-edb53b837347_19");
object1.UpdateAttrAt("xades:SignedProperties",true,"Id","SignedProperties_2a8df7f8-b958-40cc-83f6-edb53b837347_4e");
object1.UpdateAttrAt("xades:SignedProperties|xades:SignedSignatureProperties",true,"Id","SignedSignatureProperties_2a8df7f8-b958-40cc-83f6-edb53b837347_0a");
// Chilkat will replace the strings "TO BE GENERATED BY CHILKAT" with actual values when the signature is created.
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",true,"Id","SignedDataObjectProperties_2a8df7f8-b958-40cc-83f6-edb53b837347_4b");
object1.UpdateAttrAt("xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat",true,"ObjectReference","#Reference1_2a8df7f8-b958-40cc-83f6-edb53b837347_27");
object1.UpdateChildContent("xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:Description","MIME-Version: 1.0\r\nContent-Type: application/zip\r\nContent-Transfer-Encoding: binary\r\nContent-Disposition: filename="PIT-11Z.zip"");
object1.UpdateAttrAt("xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:ObjectIdentifier|xades:Identifier",true,"Qualifier","OIDAsURI");
object1.UpdateChildContent("xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:ObjectIdentifier|xades:Identifier","http://www.certum.pl/OIDAsURI/signedFile/1.2.616.1.113527.3.1.1.3.1");
object1.UpdateChildContent("xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:ObjectIdentifier|xades:Description","Opis formatu dokumentu oraz jego pelna nazwa");
object1.UpdateChildContent("xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:ObjectIdentifier|xades:DocumentationReferences|xades:DocumentationReference","http://www.certum.pl/OIDAsURI/signedFile.pdf");
object1.UpdateChildContent("xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:MimeType","application/zip");
object1.UpdateChildContent("xades:SignedProperties|xades:SignedDataObjectProperties|xades:CommitmentTypeIndication|xades:CommitmentTypeId|xades:Identifier","http://uri.etsi.org/01903/v1.2.2#ProofOfApproval");
object1.UpdateChildContent("xades:SignedProperties|xades:SignedDataObjectProperties|xades:CommitmentTypeIndication|xades:AllSignedDataObjects","");
object1.UpdateAttrAt("xades:UnsignedProperties",true,"Id","UnsignedProperties_2a8df7f8-b958-40cc-83f6-edb53b837347_55");
// Emit XML in compact (single-line) format to avoid whitespace problems.
object1.put_EmitCompact(true);
gen.AddObject("",object1.getXml(),"","");
// Create an Object to be added to the Signature.
// This is where we add the base64 representation of the PIT-11Z.zip
gen.AddObject("Object1_2a8df7f8-b958-40cc-83f6-edb53b837347",bdZip.getEncoded("base64"),"","http://www.w3.org/2000/09/xmldsig#base64");
// -------- Reference 1 --------
gen.AddObjectRef("Object1_2a8df7f8-b958-40cc-83f6-edb53b837347","sha1","C14N_WithComments","","");
gen.SetRefIdAttr("Object1_2a8df7f8-b958-40cc-83f6-edb53b837347","Reference1_2a8df7f8-b958-40cc-83f6-edb53b837347_27");
// -------- Reference 2 --------
gen.AddObjectRef("SignedProperties_2a8df7f8-b958-40cc-83f6-edb53b837347_4e","sha1","","","http://uri.etsi.org/01903#SignedProperties");
gen.SetRefIdAttr("SignedProperties_2a8df7f8-b958-40cc-83f6-edb53b837347_4e","SignedProperties-Reference_2a8df7f8-b958-40cc-83f6-edb53b837347_28");
// Provide a certificate + private key. (PFX password is test123)
CkCert cert;
success = cert.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123");
if (success == false) {
std::cout << cert.lastErrorText() << "\r\n";
return;
}
gen.SetX509Cert(cert,true);
gen.put_KeyInfoType("X509Data");
gen.put_X509Type("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.
CkStringBuilder sbXml;
// The Polish government's XmlDSig implementation requires that we reproduce an attribute-sorting error.
// (This is an error in the XML canonicalization that is not noticed when both the signature-creation code and signature-verification code use
// the same XML canonicalization implementation w/ the bug.)
gen.put_Behaviors("AttributeSortingBug,CompactSignedXml");
// Sign the XML...
success = gen.CreateXmlDSigSb(sbXml);
if (success == false) {
std::cout << gen.lastErrorText() << "\r\n";
return;
}
// -----------------------------------------------
// Save the signed XML to a file.
success = sbXml.WriteFile("qa_output/signedXml.xml","utf-8",false);
std::cout << sbXml.getAsString() << "\r\n";
// ----------------------------------------
// Verify the signature we just produced...
CkXmlDSig verifier;
success = verifier.LoadSignatureSb(sbXml);
if (success == false) {
std::cout << verifier.lastErrorText() << "\r\n";
return;
}
bool verified = verifier.VerifySignature(true);
if (verified != true) {
std::cout << verifier.lastErrorText() << "\r\n";
return;
}
std::cout << "This signature was successfully verified." << "\r\n";
// ------------------------------------
// Finally, let's extract the .zip from the signed XML, and then unzip the original PIT-11Z.xml from the in-memory zip.
CkXml xml;
xml.LoadSb(sbXml,true);
// The base64 image of the PIT-11Z.zip is in the 2nd ds:Object child of the ds:Signature (the ds:Signature is the root element of the signed XML).
// (ds:Object[0] would be the 1st ds:Object child. Index 1 is the 2nd ds:Object child.)
const char *strZipBase64 = xml.getChildContent("ds:Object[1]");
bdZip.Clear();
bdZip.AppendEncoded(strZipBase64,"base64");
if (bdZip.get_NumBytes() == 0) {
std::cout << "Something went wrong.. we dont' have any data.." << "\r\n";
return;
}
success = zip.OpenBd(bdZip);
if (success == false) {
std::cout << zip.lastErrorText() << "\r\n";
return;
}
// Get the 1st file in the zip, which should be the PIT-11Z.xml
CkZipEntry entry;
success = zip.EntryAt(0,entry);
if (success == false) {
std::cout << "Zip contains no files..." << "\r\n";
return;
}
// Get the XML:
const char *origXml = entry.unzipToString(0,"utf-8");
std::cout << "Original XML extracted from base64 zip:" << "\r\n";
std::cout << origXml << "\r\n";
}