iText-对PDF进行数字签名和文档加密

阅读更多

 

try {
      PdfReader reader = null;
      reader = new PdfReader(domainDoc.getDoc());
      ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
      com.itextpdf.text.Document document = new com.itextpdf.text.Document();
      PdfCopy copy = new PdfCopy(document, byteOut);
      document.open();
      int pageNum = reader.getNumberOfPages();
      pageNum = pageNum - getSignPages(reader);// check sign pages
      for (int page = 0; page < pageNum;) {
        copy.addPage(copy.getImportedPage(reader, ++page));
      }
      Rectangle pageRectangle = reader.getPageSize(pageNum);

      ByteArrayInputStream signStream =
          new ByteArrayInputStream(signatureTemplete2PDF(pageRectangle, domainDoc, activities));
      PdfReader signTempleteReader = new PdfReader(signStream);

      int signPageSize = signTempleteReader.getNumberOfPages();

      for (int page = 0; page < signPageSize;) {
        copy.addPage(copy.getImportedPage(signTempleteReader, ++page));
      }
      document.close();

      // eSign PDF document
      ByteArrayInputStream byteIn = new ByteArrayInputStream(byteOut.toByteArray());
      PdfReader encryptReader = new PdfReader(byteIn);
      ByteArrayOutputStream encryptByteOut = new ByteArrayOutputStream();

      // 
      String jksPath = Environments.getClassPath(properties.getProperty("store.path"));
      String keyStorePass = properties.getProperty("store.password");
      String keyPass = properties.getProperty("key.password");
      KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
      ks.load(new FileInputStream(jksPath), keyStorePass.toCharArray());

      // 获取私钥
      String alias = (String) ks.aliases().nextElement();
      PrivateKey key = (PrivateKey) ks.getKey(alias, keyPass.toCharArray());
      Certificate[] chain = ks.getCertificateChain(alias);
      PdfStamper stamper = PdfStamper.createSignature(encryptReader, encryptByteOut, '\0');

      // 进行数字签名
      PdfSignatureAppearance appearance = stamper.getSignatureAppearance();
      appearance.setCrypto(key, chain, null, PdfSignatureAppearance.WINCER_SIGNED);
      appearance.setCertificationLevel(PdfSignatureAppearance.CERTIFIED_NO_CHANGES_ALLOWED);

      appearance.setReason("BGL.Digital Signature ");
      appearance.setLocation("AU");

      stamper.getWriter().setCompressionLevel(5);

      // 使用私钥对文档进行加密，并且只允许打印选项
      stamper.setEncryption(null, Utils.md5(keyStorePass).getBytes(), PdfWriter.ALLOW_PRINTING,
          PdfWriter.ENCRYPTION_AES_256);
      // log.info("status:"+domainDoc.getStatus());
      // add watermark when signing has been completed by all required signatories.
      if (domainDoc.getStatus().equals(DocumentStatus.SIGNED)) {
        // 添加水印
        addWatermark(stamper, pageRectangle, pageNum, "Digitally Signed on "
            + Utils.formatDate(new Date()));
      }
      // add signature metadata
      //HashMap info = reader.getInfo();
    //  stamper.setMoreInfo(info);

      stamper.close();
      InputStream is = new ByteArrayInputStream(encryptByteOut.toByteArray());
      return is;
    } catch (DocumentException e) {
      log.error(e, e);
      throw new ElectronicSignaturesException(e);
    } catch (IOException e) {
      log.error(e, e);
      throw new ElectronicSignaturesException(e);
    } catch (Exception e) {
      log.error(e, e);
      throw new ElectronicSignaturesException(e);
    }

主要的jar版本为

   com.itextpdf:itextpdf:jar:5.1.1
  org.bouncycastle:bcmail-jdk15:jar:1.46
  org.bouncycastle:bcprov-jdk15:jar:1.46

• sign-ok.rar (3.8 MB)
• 下载次数: 775