ec.rubrica.pdf.FirmadorPdf.java Source code

Introduction

Here is the source code for ec.rubrica.pdf.FirmadorPdf.java

Source

/*
 * Copyright (c) 2009-2013 Rubrica.ec
 * 
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 */

package ec.rubrica.pdf;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.security.AccessController;
import java.security.GeneralSecurityException;
import java.security.PrivateKey;
import java.security.PrivilegedAction;
import java.security.Security;
import java.security.cert.Certificate;
import java.security.cert.X509Certificate;

import org.bouncycastle.jce.provider.BouncyCastleProvider;

import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfSignatureAppearance;
import com.itextpdf.text.pdf.PdfStamper;
import com.itextpdf.text.pdf.security.DigestAlgorithms;
import com.itextpdf.text.pdf.security.ExternalSignature;
import com.itextpdf.text.pdf.security.MakeSignature;
import com.itextpdf.text.pdf.security.PrivateKeySignature;
import com.itextpdf.text.pdf.security.TSAClient;

/**
 * Clase para firmar archivos PDF.
 * 
 * @author Ricardo Arguello <ricardo@rubrica.ec>
 */
public class FirmadorPdf {

    private byte[] pdf;
    private TSAClient tsaClient;

    static {
        AccessController.doPrivileged(new PrivilegedAction<Void>() {
            public Void run() {
                Security.addProvider(new BouncyCastleProvider());
                return null;
            }
        });
    }

    public FirmadorPdf(byte[] pdf) {
        this.pdf = pdf;
        this.tsaClient = null;
    }

    public FirmadorPdf(byte[] pdf, TSAClient tsaClient) {
        this.pdf = pdf;
        this.tsaClient = tsaClient;
    }

    public byte[] firmar(PrivateKey pk, X509Certificate certificado, String razon, String ubicacion)
            throws IOException {
        try {
            // Creating the reader and the stamper
            PdfReader reader = new PdfReader(pdf);

            ByteArrayOutputStream signedPdf = new ByteArrayOutputStream();
            PdfStamper stamper = PdfStamper.createSignature(reader, signedPdf, '\0');

            // Creating the appearance
            PdfSignatureAppearance appearance = stamper.getSignatureAppearance();
            appearance.setReason(razon);
            appearance.setLocation(ubicacion);

            Rectangle pageSize = reader.getPageSize(1);
            Rectangle position = new Rectangle(15, pageSize.getHeight() - 50, 250, pageSize.getHeight());
            appearance.setVisibleSignature(position, 1, "sig");

            // Creating the signature
            ExternalSignature pks = new PrivateKeySignature(pk, DigestAlgorithms.SHA1, null);

            Certificate[] chain = new Certificate[] { certificado };

            MakeSignature.signDetached(appearance, pks, chain, null, null, tsaClient,
                    BouncyCastleProvider.PROVIDER_NAME, 0, MakeSignature.CMS);

            return signedPdf.toByteArray();
        } catch (DocumentException e) {
            throw new RuntimeException(e);
        } catch (GeneralSecurityException e) {
            throw new RuntimeException(e);
        }
    }
}