Java

Extract SignatureValue from Signed XML

See more XML Digital Signatures Examples

Demonstrates how to extract the signature value from signed XML. Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.StringBuilder;
import com.chilkatsoft.chilkat2.Xml;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example will work with the following signed XML, which as been reformatted for readability.

        // <?xml version="1.0" encoding="utf-8"?>
        // <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
        //     <SOAP-ENV:Header>
        //         <wsse:Security xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" SOAP-ENV:mustUnderstand="1">
        //             <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="#Body">
        //                         <ds:Transforms>
        //                             <ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
        //                         </ds:Transforms>
        //                         <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
        //                         <ds:DigestValue>OwgHPZNfDkXnZsjpfzXqAcT3RV3HzmTsEy2bP44FJ0M=</ds:DigestValue>
        //                     </ds:Reference>
        //                 </ds:SignedInfo>
        //                 <ds:SignatureValue>C+7FWngU....DJFBcdg==</ds:SignatureValue>
        //                 <ds:KeyInfo>
        //                     <ds:KeyValue>
        //                         <ds:RSAKeyValue>
        //                             <ds:Modulus>sXeRhM55P13.....NAcibRw==</ds:Modulus>
        //                             <ds:Exponent>AQAB</ds:Exponent>
        //                         </ds:RSAKeyValue>
        //                     </ds:KeyValue>
        //                 </ds:KeyInfo>
        //             </ds:Signature>
        //         </wsse:Security>
        //     </SOAP-ENV:Header>
        //     <SOAP-ENV:Body xmlns:SOAP-SEC="http://schemas.xmlsoap.org/soap/security/2000-12" SOAP-SEC:id="Body">
        //         <z:FooBar xmlns:z="http://example.com"/>
        //     </SOAP-ENV:Body>
        // </SOAP-ENV:Envelope>

        // -----------------------------------------------------------------------------------------
        // There are a number of ways we can get the contents of the  <ds:SignatureValue>...</ds:SignatureValue>

        String filePath = "qa_data/xml_dsig_testing/sample_to_show_how_to_extract_sig.xml";

        // If you know there will only be a single SignatureValue in the XML, you don't need to parse XML.
        // Just do quick and simple string search..
        // For example:
        StringBuilder sb = new StringBuilder();
        try {
            sb.loadFile(filePath, "utf-8");
        } catch (ChilkatException e) {
            System.out.println("Failed to load file.");
            return;
        }

        String base64Sig = sb.getBetween("SignatureValue>", "</");
        System.out.println("base64Sig = " + base64Sig);

        // -----------------------------------------------------------------------------------------
        // If the XML might contain multiple signatures, but the signatures will always be located in the
        // same place, then you can (beforehand) copy a sample signed XML into Chilkat's online tool
        // at Generate Parsing Code from XML
        // to get the path to the SignatureValue.  For example, the line of code generated for the SignatureValue
        // for the above XML is:
        // string ds_SignatureValue = xml.GetChildContent("SOAP-ENV:Header|wsse:Security|ds:Signature|ds:SignatureValue");

        // So you can simply use that path..
        Xml xml = new Xml();
        xml.loadXmlFile(filePath);
        // Assume success..

        base64Sig = xml.getChildContent("SOAP-ENV:Header|wsse:Security|ds:Signature|ds:SignatureValue");
        System.out.println("base64Sig = " + base64Sig);

        // -----------------------------------------------------------------------------------------
        // Or perhaps you don't know where the signature is located in the XML.
        // You can search for the tag..
        Xml xSigVal = xml.searchForTag(xml, "*:SignatureValue");
        if (xSigVal != null) {
            System.out.println("base64Sig = " + xSigVal.getContent());
            xSigVal.close();
        } else {
            System.out.println("No SignatureValue found.");
        }
    }
}