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by Jean-Charles Laurent :: Rate this Message:

I have been trying to sign an XML file using the apache security package. I seem to be able to verify the signature on my side but it cannot be verified on the client side. What I can explain is why the

CanonicalizationMethod Algorithim is "http://www.w3.org/TR/2001/REC-xml-c14n-20010315"
<ds:CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315" xmlns:ds="http://www.w3.org/2000/09/xmldsig#"/>

but the

Transform Algorithm is "http://www.w3.org/2001/10/xml-exc-c14n#"
<ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#" xmlns:ds="http://www.w3.org/2000/09/xmldsig#"/>

Below is the output file followed by the java code and the keystore used. Please comment the code if you wish. I am not quite sure what I am doing here

Here is the output xml file:

<?xml version="1.0" encoding="UTF-8"?>
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<s:Header>
<Security s:actor="IntervenantEmetteur" xmlns="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd">
<ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
<ds:SignedInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
<ds:CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315" xmlns:ds="http://www.w3.org/2000/09/xmldsig#"/>
<ds:SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1" xmlns:ds="http://www.w3.org/2000/09/xmldsig#"/>
<ds:Reference URI="#PJC_01" xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
<ds:Transforms xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
<ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#" xmlns:ds="http://www.w3.org/2000/09/xmldsig#"/>
</ds:Transforms>
<ds:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1" xmlns:ds="http://www.w3.org/2000/09/xmldsig#"/>
<ds:DigestValue xmlns:ds="http://www.w3.org/2000/09/xmldsig#">oNbIWOzgYk4X9634QnN5uA4bTHc=</ds:DigestValue>
</ds:Reference>
</ds:SignedInfo>
<ds:SignatureValue xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
pohyKWQgfhSNe1BC/QJbR/CsDP8hSaJyQeoyJJ6TYkDa4xs7UznQV+heP/lK7zQH3jRaGO61OxhB
+rHpIVlYHl2vHRBCp6+dWu+e2/e16DfMOz2zb9K55+24GhOP3wo26riduDWg6BGQeKGCwLxyvn3r
KIe3nU/00hc4f/duh4M=
</ds:SignatureValue>
<ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
<ds:X509Data xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
<ds:X509Certificate xmlns:ds="http://www.w3.org/2000/09/xmldsig#">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</ds:X509Certificate>
</ds:X509Data>
<ds:KeyValue xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
<ds:RSAKeyValue xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
<ds:Modulus xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
5BZUYeINpXuVwM1aFnIvb6dHrpUCOCvJeKjrCHh2G6pNT5dIBxKWlNJSHo4FxJxNCwq+pyLc7et9
SliHSXpYLq8E5v0zVGEwOd7o2ZS0THYs/+ImS62hv6Og7TwsrHiDvc0y4+COVhVEx9e8Vv3abOAG
7GkzRHJy1wN41rNrII8=
</ds:Modulus>
<ds:Exponent xmlns:ds="http://www.w3.org/2000/09/xmldsig#">AQAB</ds:Exponent>
</ds:RSAKeyValue>
</ds:KeyValue>
</ds:KeyInfo>
</ds:Signature></Security>
</s:Header>
<s:Body Id="PJC_01">
Some text to sign. </s:Body>
</s:Envelope>

Java code:

import java.io.ByteArrayInputStream;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.StringReader;
import java.io.StringWriter;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.cert.X509Certificate;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.apache.xml.security.signature.XMLSignature;
import org.apache.xml.security.signature.XMLSignatureInput;
import org.apache.xml.security.transforms.Transforms;
import org.apache.xml.security.utils.Constants;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;

public class SignXMLDetached {

/** {@link org.apache.commons.logging} logging facility */
static org.apache.commons.logging.Log log =
org.apache.commons.logging.LogFactory.getLog(SignXMLDetached.class.getName());

// Name of the output file.
private static final String OUTPUT_FILE_NAME = "signature.xml";

// All the parameters for the keystore (RSA)
private String keystoreType = "JKS";
private String algoSignature = XMLSignature.ALGO_ID_SIGNATURE_RSA_SHA1;

/**
* This is sample test. It call the method that will sign an XML
* document represented as a Striong object.
*
* @param unused Arguments are for main signature but are not used.
* @throws Exception If any of the exception are encountered such
* as file not found, xml parsing errors, xml signature error, etc...
*/
public static void main(String unused[]) throws Exception {
String keystorePass = "ab987c";
String privateKeyAlias = "test";
String privateKeyPass = "kpi135";
String keystoreFile = "keystore/pjc.jks";

String xmlStream =
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
+"<s:Envelope xmlns:s=\"http://schemas.xmlsoap.org/soap/envelope/\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\">\n"
+"<s:Header>\n"
+" <Security s:actor=\"IntervenantEmetteur\" xmlns=\"http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd\">\n"
+" </Security>\n"
+"</s:Header>\n"
+"<s:Body Id=\"PJC_01\">\n"
+"Some text to sign."
+" </s:Body>\n"
+"</s:Envelope>\n";

SignXMLDetached signXml = new SignXMLDetached();
String signedXML = signXml.signIt(keystoreFile, keystorePass, privateKeyAlias,
privateKeyPass, xmlStream);

FileWriter out = new FileWriter(OUTPUT_FILE_NAME);
out.write(signedXML);
out.flush();
out.close();

System.out.println("Finished signing. View file in '"+ OUTPUT_FILE_NAME +"'.");
}

/**
* This method create an XML document using the given String object.
* Then we transform (normalize) add key information and sign the XML
* document. Finally we convert document to a String object that represents the XML document.
* @param keyStorePath : name and location of the keystore file.
* @param keystorePass : the password to open keystore.
* @param privateKeyAlias : the private key and certificate alias as stored inside the keystore.
* @param privateKeyPass : the private key password needed to retrieve private key.
* @param strXML : A String object that represents the XML document to sign.
* @return Returns a String representing the sign XML document.
* @throws Exception If any of the exception are encountered such
* as file not found, xml parsing errors, xml signature error, etc...
*/
public String signIt(String keyStorePath, String keystorePass,
String privateKeyAlias, String privateKeyPass, String strXML)
throws Exception {
org.apache.xml.security.Init.init();

KeyStore ks = KeyStore.getInstance(keystoreType);
FileInputStream fis = new FileInputStream(keyStorePath);

// Load the keystore information.
ks.load(fis, keystorePass.toCharArray());

// Get the private key from keystore (will be used for signing).
PrivateKey privateKey = (PrivateKey) ks.getKey(privateKeyAlias,
privateKeyPass.toCharArray());

// Create a document factory to build the xml file to sign.
javax.xml.parsers.DocumentBuilderFactory dbf =
javax.xml.parsers.DocumentBuilderFactory.newInstance();

// XML Signature needs to be namespace aware
dbf.setNamespaceAware(true);

// Create XML document using given string (that represents the xml document).
javax.xml.parsers.DocumentBuilder db = dbf.newDocumentBuilder();
org.w3c.dom.Document doc = db.parse(new InputSource(new StringReader(strXML)));
NodeList nodeList = doc.getElementsByTagName("Security");
Node root = nodeList.item(0);

// Create the transforms object for the Document/Reference
Transforms transforms = new Transforms(doc);

// Canonicalized part of the signature element.
transforms.addTransform(Transforms.TRANSFORM_C14N_EXCL_OMIT_COMMENTS);

// Create an XML Signature object from the document.
String baseURI = null;
XMLSignature sig = new XMLSignature(doc, baseURI, algoSignature);

// Add the above Document/Reference to signature.
// The signature is going to be injected inside the root node.
root.appendChild(sig.getElement());
sig.addDocument("#PJC_01", transforms, Constants.ALGO_ID_DIGEST_SHA1);

// Get the certificate from keystore. Then add it in the KeyInfo element
// along with the public key. Note, this could have its own alias but
// we will considered it to be the same as the private key alias.
X509Certificate cert =
(X509Certificate) ks.getCertificate(privateKeyAlias);
sig.addKeyInfo(cert);
sig.addKeyInfo(cert.getPublicKey());
sig.sign(privateKey);

// Convert XML Doc to String.
return xmlToString(doc);
}

/*
* Convert the given xml Document object to a String object.
* If an error occurs, log it and return a null object.
*
* @param doc : A Document object to convert to a String object.
* @return Returns a String object representing the given Document object.
*/
private static String xmlToString(org.w3c.dom.Document doc) {
try {
Source source = new DOMSource(doc);
StringWriter stringWriter = new StringWriter();
Result result = new StreamResult(stringWriter);
TransformerFactory factory = TransformerFactory.newInstance();
Transformer transformer = factory.newTransformer();
transformer.transform(source, result);
return stringWriter.getBuffer().toString();
} catch (TransformerConfigurationException e) {
e.printStackTrace();
} catch (TransformerException e) {
e.printStackTrace();
}
return null;
}
}

Jean-Charles Laurent
Analyste / Analyst
Le Groupe Jean Coutu (PJC) Inc.
tél: 450-463-1890 (3363)
fax: 450-646-0567
jclaurent@...

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