如何使用iText对pdf进行数字签名？

如何使用iText签署pdf？ 我正在浏览这个LINK但却不了解my_private_key.pfx。 我真的需要数字签名证书吗？ 请澄清我。 提前致谢。

Answer 1

你在问题中提到的文件是好的。 您必须创建数字签名文件。

此链接有一个使用PKCS文件和签署PDF文档的工具。 它声称使用iText，因此您应该能够理解这些步骤。 源代码在这里

Answer 2

希望这会帮助你

public class JPdfSign { private static PrivateKey privateKey; private static Certificate[] certificateChain; private static ResourceBundle bundle = ResourceBundle.getBundle("strings"); private static String PRODUCTNAME = bundle.getString("productname"); private static String VERSION = bundle.getString("version"); private static String JAR_FILENAME = bundle.getString("jar-filename"); public static void main(String[] args) { // for (int i = 0; i < args.length; i++) { // System.out.println("arg[" + i + "] :" + args[i]); // } if (args.length < 2) showUsage(); try { String pkcs12FileName = args[0].trim(); String pdfInputFileName = args[1]; String pdfOutputFileName = args[2]; boolean usePKCS12 = !(pkcs12FileName.equals("-PKCS11")); System.out.println(""); System.out.println("pdfInputFileName : " + pdfInputFileName); System.out.println("pdfOutputFileName: " + pdfOutputFileName); if (usePKCS12) readPrivateKeyFromPKCS12(pkcs12FileName); else readPrivateKeyFromPKCS11(); PdfReader reader = null; try { reader = new PdfReader(pdfInputFileName); } catch (IOException e) { System.err .println("An unknown error accoured while opening the input PDF file: \"" + pdfInputFileName + "\""); e.printStackTrace(); System.exit(-1); } FileOutputStream fout = null; try { fout = new FileOutputStream(pdfOutputFileName); } catch (FileNotFoundException e) { System.err .println("An unknown error accoured while opening the output PDF file: \"" + pdfOutputFileName + "\""); e.printStackTrace(); System.exit(-1); } PdfStamper stp = null; try { stp = PdfStamper.createSignature(reader, fout, '\0'); PdfSignatureAppearance sap = stp.getSignatureAppearance(); sap.setCrypto(privateKey, certificateChain, null, PdfSignatureAppearance.WINCER_SIGNED); // sap.setReason("I'm the author"); // sap.setLocation("Lisbon"); // sap.setVisibleSignature(new Rectangle(100, 100, 200, 200), 1, // null); stp.close(); } catch (Exception e) { System.err .println("An unknown error accoured while signing the PDF file:"); e.printStackTrace(); System.exit(-1); } } catch (KeyStoreException kse) { System.err .println("An unknown error accoured while initializing the KeyStore instance:"); kse.printStackTrace(); System.exit(-1); } } private static void readPrivateKeyFromPKCS11() throws KeyStoreException { // Initialize PKCS#11 provider from config file String configFileName = getConfigFilePath("pkcs11.cfg"); Provider p = null; try { p = new SunPKCS11(configFileName); Security.addProvider(p); } catch (ProviderException e) { System.err .println("Unable to load PKCS#11 provider with config file: " + configFileName); e.printStackTrace(); System.exit(-1); } String pkcs11PIN = "000000"; System.out.print("Please enter the smartcard pin: "); try { BufferedReader in = new BufferedReader(new InputStreamReader( System.in)); pkcs11PIN = in.readLine(); // System.out.println(pkcs11PIN); // System.out.println(pkcs11PIN.length()); } catch (Exception e) { System.err .println("An unknown error accoured while reading the PIN:"); e.printStackTrace(); System.exit(-1); } KeyStore ks = null; try { ks = KeyStore.getInstance("pkcs11", p); ks.load(null, pkcs11PIN.toCharArray()); } catch (NoSuchAlgorithmException e) { System.err .println("An unknown error accoured while reading the PKCS#11 smartcard:"); e.printStackTrace(); System.exit(-1); } catch (CertificateException e) { System.err .println("An unknown error accoured while reading the PKCS#11 smartcard:"); e.printStackTrace(); System.exit(-1); } catch (IOException e) { System.err .println("An unknown error accoured while reading the PKCS#11 smartcard:"); e.printStackTrace(); System.exit(-1); } String alias = ""; try { alias = (String) ks.aliases().nextElement(); privateKey = (PrivateKey) ks.getKey(alias, pkcs11PIN.toCharArray()); } catch (NoSuchElementException e) { System.err .println("An unknown error accoured while retrieving the private key:"); System.err .println("The selected PKCS#12 file does not contain any private keys."); e.printStackTrace(); System.exit(-1); } catch (NoSuchAlgorithmException e) { System.err .println("An unknown error accoured while retrieving the private key:"); e.printStackTrace(); System.exit(-1); } catch (UnrecoverableKeyException e) { System.err .println("An unknown error accoured while retrieving the private key:"); e.printStackTrace(); System.exit(-1); } certificateChain = ks.getCertificateChain(alias); } protected static void readPrivateKeyFromPKCS12(String pkcs12FileName) throws KeyStoreException { String pkcs12Password = ""; KeyStore ks = null; System.out.print("Please enter the password for \"" + pkcs12FileName + "\": "); try { BufferedReader in = new BufferedReader(new InputStreamReader( System.in)); pkcs12Password = in.readLine(); } catch (Exception e) { System.err .println("An unknown error accoured while reading the password:"); e.printStackTrace(); System.exit(-1); } try { ks = KeyStore.getInstance("pkcs12"); ks.load(new FileInputStream(pkcs12FileName), pkcs12Password .toCharArray()); } catch (NoSuchAlgorithmException e) { System.err .println("An unknown error accoured while reading the PKCS#12 file:"); e.printStackTrace(); System.exit(-1); } catch (CertificateException e) { System.err .println("An unknown error accoured while reading the PKCS#12 file:"); e.printStackTrace(); System.exit(-1); } catch (FileNotFoundException e) { System.err.println("Unable to open the PKCS#12 keystore file \"" + pkcs12FileName + "\":"); System.err .println("The file does not exists or missing read permission."); System.exit(-1); } catch (IOException e) { System.err .println("An unknown error accoured while reading the PKCS#12 file:"); e.printStackTrace(); System.exit(-1); } String alias = ""; try { alias = (String) ks.aliases().nextElement(); privateKey = (PrivateKey) ks.getKey(alias, pkcs12Password .toCharArray()); } catch (NoSuchElementException e) { System.err .println("An unknown error accoured while retrieving the private key:"); System.err .println("The selected PKCS#12 file does not contain any private keys."); e.printStackTrace(); System.exit(-1); } catch (NoSuchAlgorithmException e) { System.err .println("An unknown error accoured while retrieving the private key:"); e.printStackTrace(); System.exit(-1); } catch (UnrecoverableKeyException e) { System.err .println("An unknown error accoured while retrieving the private key:"); e.printStackTrace(); System.exit(-1); } certificateChain = ks.getCertificateChain(alias); } protected static String getConfigFilePath(String configFilename) { CodeSource source = JPdfSign.class.getProtectionDomain() .getCodeSource(); URL url = source.getLocation(); String jarPath = URLDecoder.decode(url.getFile()); File f = new File(jarPath); try { jarPath = f.getCanonicalPath(); } catch (IOException e) { } if (!f.isDirectory()) { f = new File(jarPath); jarPath = f.getParent(); } System.out.println(jarPath); if (jarPath.length() > 0) { return jarPath + File.separator + configFilename; } else return configFilename; } public static void showUsage() { System.out.println("jPdfSign v" + VERSION + " by Jan Peter Stotz - [e-mail]\n"); System.out.println(PRODUCTNAME + " usage:"); System.out .println("\nFor using a PKCS#12 (.p12) file as signature certificate and private key source:"); System.out.print("\tjava -jar " + JAR_FILENAME); System.out .println(" pkcs12FileName pdfInputFileName pdfOutputFileName"); System.out .println("\nFor using a PKCS#11 smartcard as signature certificate and private key source:"); System.out.print("\tjava -jar" + JAR_FILENAME); System.out.println(" -PKCS11 pdfInputFileName pdfOutputFileName"); System.exit(0); } }