Example usage for javax.crypto Cipher DECRYPT

Introduction

In this page you can find the example usage for javax.crypto Cipher DECRYPT_MODE.

Prototype

int DECRYPT_MODE

To view the source code for javax.crypto Cipher DECRYPT_MODE.

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Document

Constant used to initialize cipher to decryption mode.

Usage

From source file:MainClass.java

public static void main(String[] args) throws Exception {
    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
    byte[] input = "www.java2s.com".getBytes();
    byte[] keyBytes = new byte[] { 0x73, 0x2f, 0x2d, 0x33, (byte) 0xc8, 0x01, 0x73, 0x2b, 0x72, 0x06, 0x75,
            0x6c, (byte) 0xbd, 0x44, (byte) 0xf9, (byte) 0xc1, (byte) 0xc1, 0x03, (byte) 0xdd, (byte) 0xd9,
            0x7c, 0x7c, (byte) 0xbe, (byte) 0x8e };
    byte[] ivBytes = new byte[] { (byte) 0xb0, 0x7b, (byte) 0xf5, 0x22, (byte) 0xc8, (byte) 0xd6, 0x08,
            (byte) 0xb8 };

    // encrypt the data using precalculated keys

    Cipher cEnc = Cipher.getInstance("DESede/CBC/PKCS7Padding", "BC");

    cEnc.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(keyBytes, "DESede"), new IvParameterSpec(ivBytes));

    byte[] out = cEnc.doFinal(input);

    // decrypt the data using PBE

    char[] password = "password".toCharArray();
    byte[] salt = new byte[] { 0x7d, 0x60, 0x43, 0x5f, 0x02, (byte) 0xe9, (byte) 0xe0, (byte) 0xae };
    int iterationCount = 2048;
    PBEKeySpec pbeSpec = new PBEKeySpec(password);
    SecretKeyFactory keyFact = SecretKeyFactory.getInstance("PBEWithSHAAnd3KeyTripleDES", "BC");

    Cipher cDec = Cipher.getInstance("PBEWithSHAAnd3KeyTripleDES", "BC");
    Key sKey = keyFact.generateSecret(pbeSpec);

    cDec.init(Cipher.DECRYPT_MODE, sKey, new PBEParameterSpec(salt, iterationCount));

    System.out.println("cipher : " + new String(out));
    System.out.println("gen key: " + new String(sKey.getEncoded()));
    System.out.println("gen iv : " + new String(cDec.getIV()));
    System.out.println("plain  : " + new String(cDec.doFinal(out)));
}

From source file:TestCipher.java

public static void main(String args[]) throws Exception {
    Set set = new HashSet();
    Random random = new Random();
    for (int i = 0; i < 10; i++) {
        Point point = new Point(random.nextInt(1000), random.nextInt(2000));
        set.add(point);/*  ww w. j  a  v a  2s . co m*/
    }
    int last = random.nextInt(5000);

    // Create Key
    byte key[] = password.getBytes();
    DESKeySpec desKeySpec = new DESKeySpec(key);
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
    SecretKey secretKey = keyFactory.generateSecret(desKeySpec);

    // Create Cipher
    Cipher desCipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
    desCipher.init(Cipher.ENCRYPT_MODE, secretKey);

    // Create stream
    FileOutputStream fos = new FileOutputStream("out.des");
    BufferedOutputStream bos = new BufferedOutputStream(fos);
    CipherOutputStream cos = new CipherOutputStream(bos, desCipher);
    ObjectOutputStream oos = new ObjectOutputStream(cos);

    // Write objects
    oos.writeObject(set);
    oos.writeInt(last);
    oos.flush();
    oos.close();

    // Change cipher mode
    desCipher.init(Cipher.DECRYPT_MODE, secretKey);

    // Create stream
    FileInputStream fis = new FileInputStream("out.des");
    BufferedInputStream bis = new BufferedInputStream(fis);
    CipherInputStream cis = new CipherInputStream(bis, desCipher);
    ObjectInputStream ois = new ObjectInputStream(cis);

    // Read objects
    Set set2 = (Set) ois.readObject();
    int last2 = ois.readInt();
    ois.close();

    // Compare original with what was read back
    int count = 0;
    if (set.equals(set2)) {
        System.out.println("Set1: " + set);
        System.out.println("Set2: " + set2);
        System.out.println("Sets are okay.");
        count++;
    }
    if (last == last2) {
        System.out.println("int1: " + last);
        System.out.println("int2: " + last2);
        System.out.println("ints are okay.");
        count++;
    }
    if (count != 2) {
        System.out.println("Problem during encryption/decryption");
    }
}

From source file:AESTest.java

public static void main(String[] args) {
    try {//from   ww w .  ja  v a2s.  c o  m
        if (args[0].equals("-genkey")) {
            KeyGenerator keygen = KeyGenerator.getInstance("AES");
            SecureRandom random = new SecureRandom();
            keygen.init(random);
            SecretKey key = keygen.generateKey();
            ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(args[1]));
            out.writeObject(key);
            out.close();
        } else {
            int mode;
            if (args[0].equals("-encrypt"))
                mode = Cipher.ENCRYPT_MODE;
            else
                mode = Cipher.DECRYPT_MODE;

            ObjectInputStream keyIn = new ObjectInputStream(new FileInputStream(args[3]));
            Key key = (Key) keyIn.readObject();
            keyIn.close();

            InputStream in = new FileInputStream(args[1]);
            OutputStream out = new FileOutputStream(args[2]);
            Cipher cipher = Cipher.getInstance("AES");
            cipher.init(mode, key);

            crypt(in, out, cipher);
            in.close();
            out.close();
        }
    } catch (IOException e) {
        e.printStackTrace();
    } catch (GeneralSecurityException e) {
        e.printStackTrace();
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    }
}

From source file:RSATest.java

public static void main(String[] args) {
    try {/* w  w w  . ja v a2s.c  om*/
        if (args[0].equals("-genkey")) {
            KeyPairGenerator pairgen = KeyPairGenerator.getInstance("RSA");
            SecureRandom random = new SecureRandom();
            pairgen.initialize(KEYSIZE, random);
            KeyPair keyPair = pairgen.generateKeyPair();
            ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(args[1]));
            out.writeObject(keyPair.getPublic());
            out.close();
            out = new ObjectOutputStream(new FileOutputStream(args[2]));
            out.writeObject(keyPair.getPrivate());
            out.close();
        } else if (args[0].equals("-encrypt")) {
            KeyGenerator keygen = KeyGenerator.getInstance("AES");
            SecureRandom random = new SecureRandom();
            keygen.init(random);
            SecretKey key = keygen.generateKey();

            // wrap with RSA public key
            ObjectInputStream keyIn = new ObjectInputStream(new FileInputStream(args[3]));
            Key publicKey = (Key) keyIn.readObject();
            keyIn.close();

            Cipher cipher = Cipher.getInstance("RSA");
            cipher.init(Cipher.WRAP_MODE, publicKey);
            byte[] wrappedKey = cipher.wrap(key);
            DataOutputStream out = new DataOutputStream(new FileOutputStream(args[2]));
            out.writeInt(wrappedKey.length);
            out.write(wrappedKey);

            InputStream in = new FileInputStream(args[1]);
            cipher = Cipher.getInstance("AES");
            cipher.init(Cipher.ENCRYPT_MODE, key);
            crypt(in, out, cipher);
            in.close();
            out.close();
        } else {
            DataInputStream in = new DataInputStream(new FileInputStream(args[1]));
            int length = in.readInt();
            byte[] wrappedKey = new byte[length];
            in.read(wrappedKey, 0, length);

            // unwrap with RSA private key
            ObjectInputStream keyIn = new ObjectInputStream(new FileInputStream(args[3]));
            Key privateKey = (Key) keyIn.readObject();
            keyIn.close();

            Cipher cipher = Cipher.getInstance("RSA");
            cipher.init(Cipher.UNWRAP_MODE, privateKey);
            Key key = cipher.unwrap(wrappedKey, "AES", Cipher.SECRET_KEY);

            OutputStream out = new FileOutputStream(args[2]);
            cipher = Cipher.getInstance("AES");
            cipher.init(Cipher.DECRYPT_MODE, key);

            crypt(in, out, cipher);
            in.close();
            out.close();
        }
    } catch (IOException e) {
        e.printStackTrace();
    } catch (GeneralSecurityException e) {
        e.printStackTrace();
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    }
}

From source file:com.edduarte.protbox.Protbox.java

public static void main(String... args) {

    // activate debug / verbose mode
    if (args.length != 0) {
        List<String> argsList = Arrays.asList(args);
        if (argsList.contains("-v")) {
            Constants.verbose = true;//from w w  w .jav a  2s  .co m
        }
    }

    // use System's look and feel
    try {
        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    } catch (Exception ex) {
        // If the System's look and feel is not obtainable, continue execution with JRE look and feel
    }

    // check this is a single instance
    try {
        new ServerSocket(1882);
    } catch (IOException ex) {
        JOptionPane.showMessageDialog(null,
                "Another instance of Protbox is already running.\n" + "Please close the other instance first.",
                "Protbox already running", JOptionPane.ERROR_MESSAGE);
        System.exit(1);
    }

    // check if System Tray is supported by this operative system
    if (!SystemTray.isSupported()) {
        JOptionPane.showMessageDialog(null,
                "Your operative system does not support system tray functionality.\n"
                        + "Please try running Protbox on another operative system.",
                "System tray not supported", JOptionPane.ERROR_MESSAGE);
        System.exit(1);
    }

    // add PKCS11 providers
    FileFilter fileFilter = new AndFileFilter(new WildcardFileFilter(Lists.newArrayList("*.config")),
            HiddenFileFilter.VISIBLE);

    File[] providersConfigFiles = new File(Constants.PROVIDERS_DIR).listFiles(fileFilter);

    if (providersConfigFiles != null) {
        for (File f : providersConfigFiles) {
            try {
                List<String> lines = FileUtils.readLines(f);
                String aliasLine = lines.stream().filter(line -> line.contains("alias")).findFirst().get();
                lines.remove(aliasLine);
                String alias = aliasLine.split("=")[1].trim();

                StringBuilder sb = new StringBuilder();
                for (String s : lines) {
                    sb.append(s);
                    sb.append("\n");
                }

                Provider p = new SunPKCS11(new ReaderInputStream(new StringReader(sb.toString())));
                Security.addProvider(p);

                pkcs11Providers.put(p.getName(), alias);

            } catch (IOException | ProviderException ex) {
                if (ex.getMessage().equals("Initialization failed")) {
                    ex.printStackTrace();

                    String s = "The following error occurred:\n" + ex.getCause().getMessage()
                            + "\n\nIn addition, make sure you have "
                            + "an available smart card reader connected before opening the application.";
                    JTextArea textArea = new JTextArea(s);
                    textArea.setColumns(60);
                    textArea.setLineWrap(true);
                    textArea.setWrapStyleWord(true);
                    textArea.setSize(textArea.getPreferredSize().width, 1);

                    JOptionPane.showMessageDialog(null, textArea, "Error loading PKCS11 provider",
                            JOptionPane.ERROR_MESSAGE);
                    System.exit(1);
                } else {
                    ex.printStackTrace();
                    JOptionPane.showMessageDialog(null,
                            "Error while setting up PKCS11 provider from configuration file " + f.getName()
                                    + ".\n" + ex.getMessage(),
                            "Error loading PKCS11 provider", JOptionPane.ERROR_MESSAGE);
                }
            }
        }
    }

    // adds a shutdown hook to save instantiated directories into files when the application is being closed
    Runtime.getRuntime().addShutdownHook(new Thread(Protbox::exit));

    // get system tray and run tray applet
    tray = SystemTray.getSystemTray();
    SwingUtilities.invokeLater(() -> {

        if (Constants.verbose) {
            logger.info("Starting application");
        }

        //Start a new TrayApplet object
        trayApplet = TrayApplet.getInstance();
    });

    // prompts the user to choose which provider to use
    ProviderListWindow.showWindow(Protbox.pkcs11Providers.keySet(), providerName -> {

        // loads eID token
        eIDTokenLoadingWindow.showPrompt(providerName, (returnedUser, returnedCertificateData) -> {
            user = returnedUser;
            certificateData = returnedCertificateData;

            // gets a password to use on the saved registry files (for loading and saving)
            final AtomicReference<Consumer<SecretKey>> consumerHolder = new AtomicReference<>(null);
            consumerHolder.set(password -> {
                registriesPasswordKey = password;
                try {
                    // if there are serialized files, load them if they can be decoded by this user's private key
                    final List<SavedRegistry> serializedDirectories = new ArrayList<>();
                    if (Constants.verbose) {
                        logger.info("Reading serialized registry files...");
                    }

                    File[] registryFileList = new File(Constants.REGISTRIES_DIR).listFiles();
                    if (registryFileList != null) {
                        for (File f : registryFileList) {
                            if (f.isFile()) {
                                byte[] data = FileUtils.readFileToByteArray(f);
                                try {
                                    Cipher cipher = Cipher.getInstance("AES");
                                    cipher.init(Cipher.DECRYPT_MODE, registriesPasswordKey);
                                    byte[] registryDecryptedData = cipher.doFinal(data);
                                    serializedDirectories.add(new SavedRegistry(f, registryDecryptedData));
                                } catch (GeneralSecurityException ex) {
                                    if (Constants.verbose) {
                                        logger.info("Inserted Password does not correspond to " + f.getName());
                                    }
                                }
                            }
                        }
                    }

                    // if there were no serialized directories, show NewDirectory window to configure the first folder
                    if (serializedDirectories.isEmpty() || registryFileList == null) {
                        if (Constants.verbose) {
                            logger.info("No registry files were found: running app as first time!");
                        }
                        NewRegistryWindow.start(true);

                    } else { // there were serialized directories
                        loadRegistry(serializedDirectories);
                        trayApplet.repaint();
                        showTrayApplet();
                    }

                } catch (AWTException | IOException | GeneralSecurityException | ReflectiveOperationException
                        | ProtboxException ex) {

                    JOptionPane.showMessageDialog(null,
                            "The inserted password was invalid! Please try another one!", "Invalid password!",
                            JOptionPane.ERROR_MESSAGE);
                    insertPassword(consumerHolder.get());
                }
            });
            insertPassword(consumerHolder.get());
        });
    });
}

From source file:jfs.sync.meta.MetaFileStorageAccess.java

/**
 *
 * Extract one file from encrypted repository.
 *
 * TODO: list directories//  w w w . j  a  va2  s. c o m
 *
 */
public static void main(String[] args) throws Exception {
    final String password = args[0];
    MetaFileStorageAccess storage = new MetaFileStorageAccess("Twofish", false) {

        protected String getPassword(String relativePath) {
            String result = "";

            String pwd = password;

            int i = 0;
            int j = relativePath.length() - 1;
            while ((i < pwd.length()) || (j >= 0)) {
                if (i < pwd.length()) {
                    result += pwd.charAt(i++);
                } // if
                if (j >= 0) {
                    result += relativePath.charAt(j--);
                } // if
            } // while

            return result;
        } // getPassword()
    };
    String encryptedPath = args[2];
    String[] elements = encryptedPath.split("\\\\");
    String path = "";
    for (int i = 0; i < elements.length; i++) {
        String encryptedName = elements[i];
        String plain = storage.getDecryptedFileName(path, encryptedName);
        path += storage.getSeparator();
        path += plain;
        System.out.println(path);
    } // for

    String cipherSpec = storage.getCipherSpec();
    byte[] credentials = storage.getFileCredentials(path);
    Cipher cipher = SecurityUtils.getCipher(cipherSpec, Cipher.DECRYPT_MODE, credentials);

    InputStream is = storage.getInputStream(args[1], path);
    is = JFSEncryptedStream.createInputStream(is, JFSEncryptedStream.DONT_CHECK_LENGTH, cipher);
    int b = 0;
    while (b >= 0) {
        b = is.read();
        System.out.print((char) b);
    } // while
    is.close();
}

From source file:Main.java

public static byte[] decrypt(byte[] key, byte[] input) throws Exception {
    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(key, "AES"));
    byte[] decrypted = cipher.doFinal(input);
    return decrypted;
}

From source file:Main.java

public static byte[] decryptData(byte[] encryptedData, PrivateKey privateKey) {
    try {//from www.j a  va2s.c  o  m
        Cipher cipher = Cipher.getInstance(RSA);
        cipher.init(Cipher.DECRYPT_MODE, privateKey);
        return cipher.doFinal(encryptedData);
    } catch (Exception e) {
        return null;
    }
}

From source file:Main.java

public static byte[] decrypt(byte[] data, byte[] key) throws Exception {
    SecretKey secretKey = new SecretKeySpec(key, "AES");

    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.DECRYPT_MODE, secretKey);
    byte[] plainBytes = cipher.doFinal(data);
    return plainBytes;
}

From source file:Main.java

public static byte[] decrypt(byte[] data, byte[] key) throws Exception {
    SecretKey secretKey = new SecretKeySpec(key, "DESede");
    Cipher cipher = Cipher.getInstance("DESede");
    cipher.init(Cipher.DECRYPT_MODE, secretKey);
    return cipher.doFinal(data);
}

Example usage for javax.crypto Cipher DECRYPT_MODE

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