Java

Canonicalize XML Fragment

See more XML Digital Signatures Examples

Demonstrates how to canonicalize a fragment of an XML document. The fragment is identified by the element having an Id attribute equal to a specified value. (The Id attribute can have any namespace, and the attribute name is case-insensitive (thus "ID", "Id", "id", etc. match). Chilkat2 Java

import com.chilkatsoft.chilkat2.Http;
import com.chilkatsoft.chilkat2.StringBuilder;
import com.chilkatsoft.chilkat2.XmlDSig;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example requires the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        Http http = new Http();
        StringBuilder sbXml = new StringBuilder();
        XmlDSig canon = new XmlDSig();

        // Use exclusive XML canonicalization.
        String canonVersion = "EXCL_C14N";
        boolean withComments = false;
        // The optional inclusive namespaces prefix list if using exclusive canonicalization.
        String prefixList = "";

        String url = "https://www.chilkatsoft.com/exampleData/canonicalizeFragmentTest.xml";
        http.quickGetSb(url, sbXml);

        // This is the input XML:

        // <?xml version="1.0" encoding="UTF-8"?>
        // <Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
        // <SignedInfo>
        //   <CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315" />
        //   <SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1" />
        //   <Reference URI="#object">
        //     <DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1" />
        //     <DigestValue>OPnpF/ZNLDxJ/I+1F3iHhlmSwgo=</DigestValue>
        //   </Reference>
        // </SignedInfo>
        // <SignatureValue>nihUFQg4mDhLgecvhIcKb9Gz8VRTOlw+adiZOBBXgK4JodEe5aFfCqm8WcRIT8GL
        // LXSk8PsUP4//SsKqUBQkpotcAqQAhtz2v9kCWdoUDnAOtFZkd/CnsZ1sge0ndha4
        // 0wWDV+nOWyJxkYgicvB8POYtSmldLLepPGMz+J7/Uws=</SignatureValue>
        // <KeyInfo>
        //   <KeyValue>
        //     <RSAKeyValue>
        //       <Modulus>4IlzOY3Y9fXoh3Y5f06wBbtTg94Pt6vcfcd1KQ0FLm0S36aGJtTSb6pYKfyX7PqC
        //       UQ8wgL6xUJ5GRPEsu9gyz8ZobwfZsGCsvu40CWoT9fcFBZPfXro1Vtlh/xl/yYHm
        //       +Gzqh0Bw76xtLHSfLfpVOrmZdwKmSFKMTvNXOFd0V18=</Modulus>
        //       <Exponent>AQAB</Exponent>
        //     </RSAKeyValue>
        //   </KeyValue>
        // </KeyInfo>
        // <Object Id="object">some text
        //   with spaces and CR-LF.</Object>
        // </Signature>

        // Canonicalize and return the fragment of XML starting at the element where the Id attribute equals "object".
        String xmlCanonFrag = canon.canonicalizeFragment(sbXml.getAsString(), "object", canonVersion, prefixList, withComments);
        System.out.println(xmlCanonFrag);

        // The output is:
        //
        // <Object xmlns="http://www.w3.org/2000/09/xmldsig#" Id="object">some text
        //   with spaces and CR-LF.</Object>
        //
    }
}