Download - Svetlin Nakov

* All rights reserved. This code is freeware. It can be used
* for any purpose as long as this copyright statement is not
* removed or modified.
*/
public class SmartCardSignerApplet extends Applet {
private static final String FILE_NAME_FIELD_PARAM = "fileNameField";
private static final String CERT_CHAIN_FIELD_PARAM = "certificationChainField";
private static final String SIGNATURE_FIELD_PARAM = "signatureField";
private static final String SIGN_BUTTON_CAPTION_PARAM = "signButtonCaption";
private static final String PKCS11_KEYSTORE_TYPE = "PKCS11";
private static final String X509_CERTIFICATE_TYPE = "X.509";
private static final String CERTIFICATION_CHAIN_ENCODING = "PkiPath";
private static final String DIGITAL_SIGNATURE_ALGORITHM_NAME = "SHA1withRSA";
private static final String SUN_PKCS11_PROVIDER_CLASS =
"sun.security.pkcs11.SunPKCS11";
private Button mSignButton;
/**
* Initializes the applet - creates and initializes its graphical user interface.
* Actually the applet consists of a single button, that fills its all surface.
* The button's caption is taken from the applet param SIGN_BUTTON_CAPTION_PARAM.
*/
public void init() {
String signButtonCaption = this.getParameter(SIGN_BUTTON_CAPTION_PARAM);
mSignButton = new Button(signButtonCaption);
mSignButton.setLocation(0, 0);
Dimension appletSize = this.getSize();
mSignButton.setSize(appletSize);
mSignButton.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
signSelectedFile();
}
});
this.setLayout(null);
this.add(mSignButton);
}
/**
* Signs the selected file. The file name comes from a field in the HTML
* document. The result consists of the calculated digital signature and
* certification chain, both placed in fields in the HTML document, encoded
* in Base64 format. The HTML document should contain only one HTML form.
* The name of the field, that contains the name of the file to be signed
* is obtained from FILE_NAME_FIELD_PARAM applet parameter. The names of the
* output fields for the signature and the certification chain are obtained
* from the parameters CERT_CHAIN_FIELD_PARAM and SIGNATURE_FIELD_PARAM. The
* user is asket to choose a PKCS#11 implementation library and a PIN code
* for accessing the smart card.
*/
private void signSelectedFile() {
try {
// Get the file name to be signed from the form in the HTML document
JSObject browserWindow = JSObject.getWindow(this);
JSObject mainForm = (JSObject) browserWindow.eval("document.forms[0]");
String fileNameFieldName = this.getParameter(FILE_NAME_FIELD_PARAM);
JSObject fileNameField =
(JSObject) mainForm.getMember(fileNameFieldName);
String fileName = (String) fileNameField.getMember("value");
// Perform the actual file signing
CertificationChainAndSignatureBase64 signingResult = signFile(fileName);
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