Java

Examine KeyInfo Certificate in XML Signature

See more XML Digital Signatures Examples

This example loads signed XML and gets the signing certificate, assuming the certificate is contained in X509Certificate within the KeyInfo. Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

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

    CkXmlDSig dsig = new CkXmlDSig();
    CkStringBuilder sbXml = new CkStringBuilder();

    success = sbXml.LoadFile("c:/aaworkarea/elias/3/face_f09006808443a699d1b.xml","utf-8");
    if (success != true) {
        System.out.println("Failed to load XML file.");
        return;
        }

    success = dsig.LoadSignatureSb(sbXml);
    if (success != true) {
        System.out.println(dsig.lastErrorText());
        return;
        }

    // Get the KeyInfo XML.
    CkXml xmlKeyInfo = dsig.GetKeyInfo();
    if (dsig.get_LastMethodSuccess() != true) {
        System.out.println(dsig.lastErrorText());
        return;
        }

    System.out.println(xmlKeyInfo.getXml());
    System.out.println("----");

    // Assuming the X509Certificate is in the KeyInfo, it will look like this:

    //   <ds:KeyInfo Id="...">
    //     <ds:KeyValue>
    //     ...  
    //     <ds:X509Data>
    //       <ds:X509Certificate>MIIHAz...</ds:X509Certificate>
    //     </ds:X509Data>
    //   </ds:KeyInfo>
    String certBase64 = xmlKeyInfo.getChildContent("*:X509Data|*:X509Certificate");
    if (xmlKeyInfo.get_LastMethodSuccess() != true) {
        System.out.println("No X509Certificate found in the KeyInfo.");
        return;
        }

    // Load a certificate object w/ the base64.
    CkCert cert = new CkCert();
    success = cert.LoadFromBase64(certBase64);
    if (success != true) {
        System.out.println(cert.lastErrorText());
        return;
        }

    // Examine the cert..
    System.out.println("SubjectDN: " + cert.subjectDN());
    System.out.println("IssuerDN: " + cert.issuerDN());
    System.out.println("SerialNumber as Decimal: " + cert.serialDecimal());
  }
}