Java

Get Certificates within XML Signature

See more XML Digital Signatures Examples

Demonstrates how to get the certificates contained within an XML signature. Chilkat2 Java

import com.chilkatsoft.chilkat2.Cert;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.StringArray;
import com.chilkatsoft.chilkat2.StringBuilder;
import com.chilkatsoft.chilkat2.XmlDSig;

public class ChilkatExample {

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

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

        StringBuilder sbXml = new StringBuilder();

        // Load XML containing one or more signatures.
        try {
            sbXml.loadFile("qa_data/xml_dsig_valid_samples/multipleSigners/sp.pdf.XAdES.xml", "utf-8");
        } catch (ChilkatException e) {
            System.out.println("Failed to load the XML file..");
            return;
        }

        XmlDSig dsig = new XmlDSig();

        // First load the XML containing the signatures to be verified.
        // Note that this particular Signature already contains the RSA public key that will be used
        // for verification.
        try {
            dsig.loadSignatureSb(sbXml);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // For each signature, verify and also get the certificate(s) contained within each Signature.
        int i = 0;
        StringArray saCerts = new StringArray();
        Cert cert = new Cert();

        System.out.println("numSignatures = " + dsig.getNumSignatures());

        while (i < dsig.getNumSignatures()) {
            // Select the Nth signature by setting the Selector property.
            dsig.setSelector(i);

            boolean bVerifyReferenceDigests = true;
            boolean bVerified;
            try {
                dsig.verifySignature(bVerifyReferenceDigests);
                bVerified = true;
            } catch (ChilkatException e) {
                bVerified = false;
            }
            System.out.println("Signature " + (i + 1) + " verified = " + bVerified);

            // Get the certificates embedded in this signature.
            saCerts.clear();
            try {
                dsig.getCerts(saCerts);
                success = true;
            } catch (ChilkatException e) {
                success = false;
            }
            if (success) {
                int j = 0;
                while (j < saCerts.getCount()) {
                    try {
                        cert.loadFromBase64(saCerts.getString(j));
                        success = true;
                    } catch (ChilkatException e) {
                        success = false;
                    }
                    if (success) {
                        System.out.println("    " + cert.getSubjectDN());
                    }

                    j = j + 1;
                }
            }

            i = i + 1;
        }
    }
}