Java PdfSignatureAppearance.getRangeStream方法代码示例

import com.itextpdf.text.pdf.PdfSignatureAppearance; //导入方法依赖的package包/类
public ByteArrayOutputStream doSign(byte[] pdf, Rectangle stampPos, int pageNmbrForStamp) throws IOException, DocumentException, NoSuchAlgorithmException, InvalidKeyException, SignatureException {
        Certificate[] chain = signCert.toArray(new Certificate[0]);

        PdfReader reader = new PdfReader(pdf);
        ByteArrayOutputStream byteOS = new ByteArrayOutputStream();
        PdfStamper stp = PdfStamper.createSignature(reader, byteOS, '\0', null, true);
        PdfSignatureAppearance sap = stp.getSignatureAppearance();
        if (stampPos != null) {
            sap.setVisibleSignature(new com.itextpdf.text.Rectangle(stampPos.x, stampPos.y, stampPos.width, stampPos.height), pageNmbrForStamp, null);
            sap.setRenderingMode(PdfSignatureAppearance.RenderingMode.NAME_AND_DESCRIPTION);
            sap.setAcro6Layers(true);
        }
//        Siganture Appearance

        PdfSignature dic = new PdfSignature(PdfName.ADOBE_PPKLITE, new PdfName("adbe.pkcs7.detached"));
        log.info("Creating signature with reason: " + ParamValidator.getInstance().getSignatureReason());
        sap.setReason(ParamValidator.getInstance().getSignatureReason());
        sap.setLocation("Ruhr-Universität Bochum");
        Image i = Image.getInstance(getClass().getResource("/de/rub/dez6a3/jpdfsigner/resources/images/sign.png"));
        sap.setImage(i);
        sap.setCrypto((PrivateKey) signPrivKey, chain, null, PdfSignatureAppearance.WINCER_SIGNED);
        dic.setReason(ParamValidator.getInstance().getSignatureReason());
        dic.setLocation("Ruhr-Universität Bochum");
        sap.setCryptoDictionary(dic);
        // preserve some space for the contents
        int contentEstimated = 15000;
        HashMap<PdfName, Integer> exc = new HashMap<PdfName, Integer>();
        exc.put(PdfName.CONTENTS, new Integer(contentEstimated * 2 + 2));
        sap.preClose(exc);
        // make the digest
        InputStream data = sap.getRangeStream();
        MessageDigest messageDigest = MessageDigest.getInstance("SHA1");
        byte buf[] = new byte[8192];
        int n;
        while ((n = data.read(buf)) > 0) {
            messageDigest.update(buf, 0, n);
        }
        byte hash[] = messageDigest.digest();
        Calendar cal = Calendar.getInstance();
        // If we add a time stamp:
        TSAClient tsc = new TSAClientBouncyCastle("http://zeitstempel.dfn.de/");
        // Create the signature

        PdfPKCS7 sgn;
        try {
            sgn = new PdfPKCS7((PrivateKey) signPrivKey, chain, null, "SHA1", null, false);
            byte sh[] = sgn.getAuthenticatedAttributeBytes(hash, cal, null);
            sgn.update(sh, 0, sh.length);
            byte[] encodedSig = sgn.getEncodedPKCS7(hash, cal, tsc, null);

            if (contentEstimated + 2 < encodedSig.length) {
                throw new DocumentException("Not enough space");
            }

            byte[] paddedSig = new byte[contentEstimated];
            System.arraycopy(encodedSig, 0, paddedSig, 0, encodedSig.length);
            // Replace the contents
            PdfDictionary dic2 = new PdfDictionary();
            dic2.put(PdfName.CONTENTS, new PdfString(paddedSig).setHexWriting(true));
            sap.close(dic2);
        } catch (NoSuchProviderException ex) {
            ex.printStackTrace();
        }
        return byteOS;
    }
 

import com.itextpdf.text.pdf.PdfSignatureAppearance; //导入方法依赖的package包/类
public DigestInfo preSign(List<DigestInfo> arg0, List<X509Certificate> certificates)
		throws NoSuchAlgorithmException {
	System.out.println("SignatureServiceImpl::preSign");
	
	HttpSession session = getSession();
	SignatureRequest request = (SignatureRequest)session.getAttribute(BeidConstants.SIGNATUREREQUEST_SESSION_NAME);
	ContentStream content = request.getDocument().getContentStream();
	
	try 
	{
		Certificate[] chain = new Certificate[certificates.size()];
		int index = 0;
		for (X509Certificate cert: certificates)
		{
			//System.out.println("CERT: "+cert);
			chain[index++] = cert;
		}
		
		// we create a reader and a stamper
		PdfReader reader = new PdfReader(content.getStream());
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		PdfStamper stamper = PdfStamper.createSignature(reader, baos, '\0');
		// we create the signature appearance
		PdfSignatureAppearance sap = stamper.getSignatureAppearance();
		
		request.fillAppearance(sap, reader);

		sap.setCertificate(chain[0]);
		// we create the signature infrastructure
		PdfSignature dic = new PdfSignature(PdfName.ADOBE_PPKLITE, PdfName.ADBE_PKCS7_DETACHED);
		dic.setReason(sap.getReason());
		dic.setLocation(sap.getLocation());
		dic.setContact(sap.getContact());
		dic.setDate(new PdfDate(sap.getSignDate()));
		sap.setCryptoDictionary(dic);
		HashMap<PdfName, Integer> exc = new HashMap<PdfName, Integer>();
		exc.put(PdfName.CONTENTS, new Integer(8192 * 2 + 2));
		sap.preClose(exc);
		ExternalDigest externalDigest = new ExternalDigest() {
			public MessageDigest getMessageDigest(String hashAlgorithm)
					throws GeneralSecurityException {
				return DigestAlgorithms.getMessageDigest(hashAlgorithm,
						null);
			}
		};
		PdfPKCS7 sgn = new PdfPKCS7(null, chain, "SHA256", null, externalDigest, false);
		InputStream data = sap.getRangeStream();
		byte hash[] = DigestAlgorithms.digest(data, externalDigest.getMessageDigest("SHA256"));
		Calendar cal = Calendar.getInstance();
		byte[] sh = sgn.getAuthenticatedAttributeBytes(hash, cal, null, null, CryptoStandard.CMS);
		sh = MessageDigest.getInstance("SHA256", "BC").digest(sh);
		
		// We store the objects we'll need for post signing in a session
		session.setAttribute(BeidConstants.SIGNATURE_SESSION_NAME, sgn);
		session.setAttribute(BeidConstants.HASH_SESSION_NAME, hash);
		session.setAttribute(BeidConstants.CAL_SESSION_NAME, cal);
		session.setAttribute(BeidConstants.SAP_SESSION_NAME, sap);
		session.setAttribute(BeidConstants.BAOS_SESSION_NAME, baos);
		DigestInfo info = new DigestInfo(sh, "SHA-256", "BeidSign");
		
		return info;
	}
	catch(Exception e)
	{
		e.printStackTrace();
	}
	
	return null;
}