Example usage for javax.crypto KeyGenerator getInstance

Introduction

In this page you can find the example usage for javax.crypto KeyGenerator getInstance.

Prototype

public static final KeyGenerator getInstance(String algorithm) throws NoSuchAlgorithmException 

Source Link

Document

Returns a KeyGenerator object that generates secret keys for the specified algorithm.

Usage

From source file:MainClass.java

public static void main(String[] args) {
    if (args.length != 2) {
        String err = "Usage: KeyGeneratorApp algorithmName keySize";
        System.out.println(err);//from  w ww .  j av  a2s. c om
        System.exit(0);
    }
    int keySize = (new Integer(args[1])).intValue();
    SecretKey skey = null;
    KeyPair keys = null;
    String algorithm = args[0];

    try {
        KeyPairGenerator kpg = KeyPairGenerator.getInstance(algorithm);
        kpg.initialize(keySize);
        keys = kpg.genKeyPair();
    } catch (NoSuchAlgorithmException ex1) {
        try {
            KeyGenerator kg = KeyGenerator.getInstance(algorithm);
            kg.init(keySize);
            skey = kg.generateKey();
        } catch (NoSuchAlgorithmException ex2) {
            System.out.println("Algorithm not supported: " + algorithm);
            System.exit(0);

        }
    }
}

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From source file:DesEncrypter.java

public static void main(String[] argv) throws Exception {
    SecretKey key = KeyGenerator.getInstance("DES").generateKey();
    DesEncrypter encrypter = new DesEncrypter(key);
    String encrypted = encrypter.encrypt("Don't tell anybody!");
    String decrypted = encrypter.decrypt(encrypted);
}

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From source file:DesEncrypter.java

public static void main(String[] argv) throws Exception {
    SecretKey key = KeyGenerator.getInstance("DES").generateKey();
    DesEncrypter encrypter = new DesEncrypter(key);
    encrypter.encrypt(new FileInputStream("cleartext1"), new FileOutputStream("ciphertext"));
    encrypter.decrypt(new FileInputStream("ciphertext"), new FileOutputStream("cleartext2"));
}

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From source file:AESTest.java

public static void main(String[] args) {
    try {/*  ww w . j av a 2s  .c om*/
        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 {/*from w  w w  .j  a  va  2  s  .com*/
        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();
    }
}

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From source file:org.apache.juddi.samples.DES.java

public static void main(String[] args) throws Exception {
    DES des = new DES();
    KeyGenerator kgen;//  www .ja v  a  2 s . c  om
    try {
        kgen = KeyGenerator.getInstance(DESEDE_ENCRYPTION_SCHEME);
        kgen.init(168);
        SecretKey skey = kgen.generateKey();
        byte[] raw = skey.getEncoded();
        myEncryptionKey = new String(Base64.encodeBase64(raw));
        myEncryptionScheme = DESEDE_ENCRYPTION_SCHEME;
        arrayBytes = myEncryptionKey.getBytes(UNICODE_FORMAT);
        ks = new DESedeKeySpec(arrayBytes);
        skf = SecretKeyFactory.getInstance(myEncryptionScheme);
        cipher = Cipher.getInstance(myEncryptionScheme);
        key = skf.generateSecret(ks);

        System.out.println(new String(Base64.encodeBase64(raw)));
        System.out.println(des.encrypt("password"));
        System.out.println(des.decrypt(des.encrypt("password")));
    } catch (Exception ex) {
        ex.printStackTrace();
        ;
    }

}

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From source file:backtype.storm.security.serialization.BlowfishTupleSerializer.java

/**
 * Produce a blowfish key to be used in "Storm jar" command
 */// w w w  . java  2s . com
public static void main(String[] args) {
    try {
        KeyGenerator kgen = KeyGenerator.getInstance("Blowfish");
        SecretKey skey = kgen.generateKey();
        byte[] raw = skey.getEncoded();
        String keyString = new String(Hex.encodeHex(raw));
        System.out.println("storm -c " + SECRET_KEY + "=" + keyString + " -c "
                + Config.TOPOLOGY_TUPLE_SERIALIZER + "=" + BlowfishTupleSerializer.class.getName() + " ...");
    } catch (Exception ex) {
        LOG.error(ex.getMessage());
        ex.printStackTrace();
    }
}

---

From source file:org.apache.storm.security.serialization.BlowfishTupleSerializer.java

/**
 * Produce a blowfish key to be used in "Storm jar" command
 *//*from   w w  w.j  ava 2 s  . c  o  m*/
public static void main(String[] args) {
    try {
        KeyGenerator kgen = KeyGenerator.getInstance("Blowfish");
        kgen.init(256);
        SecretKey skey = kgen.generateKey();
        byte[] raw = skey.getEncoded();
        String keyString = new String(Hex.encodeHex(raw));
        System.out.println("storm -c " + SECRET_KEY + "=" + keyString + " -c "
                + Config.TOPOLOGY_TUPLE_SERIALIZER + "=" + BlowfishTupleSerializer.class.getName() + " ...");
    } catch (Exception ex) {
        LOG.error(ex.getMessage());
    }
}

---

From source file:org.openanzo.security.keystore.TestSecretKeyEncoder.java

/**
 * Main method used to generate a keystore. Useful for bootstrapping the first time.
 * /*ww  w  .  ja v  a2s  .c om*/
 * @param args
 * @throws Exception
 */
public static void main(String[] args) throws Exception {
    File file = new File("testKeystore");
    System.out.println("Generating new keystore to:" + file.getAbsolutePath());

    KeyStore keyStore = KeyStore.getInstance("JCEKS");
    keyStore.load(null, TEST_KEYSTORE_PASSWORD);
    KeyGenerator kgen = KeyGenerator.getInstance(ALGORITHM);
    Key key = kgen.generateKey();
    keyStore.setKeyEntry(KEY_NAME, key, TEST_KEYSTORE_PASSWORD, new Certificate[0]);
    keyStore.store(FileUtils.openOutputStream(file), TEST_KEYSTORE_PASSWORD);
    System.out.println("Done generating keystore.");
}

---

From source file:org.apache.metron.dataservices.auth.AuthToken.java

public static void main(String[] args) throws Exception {

    Options options = new Options();

    options.addOption("keystoreFile", true, "Keystore File");
    options.addOption("keystorePassword", true, "Keystore Password");
    options.addOption("authTokenAlias", true, "");

    CommandLineParser parser = new GnuParser();
    CommandLine cmd = parser.parse(options, args);

    try {/*ww  w. j  ava2  s.  c o  m*/
        KeyStore ks = KeyStore.getInstance("JCEKS");

        String keystorePassword = cmd.getOptionValue("keystorePassword");
        String keystoreFile = cmd.getOptionValue("keystoreFile");
        String authTokenAlias = cmd.getOptionValue("authTokenAlias");

        ks.load(null, keystorePassword.toCharArray());

        // generate a key and store it in the keystore...
        KeyGenerator keyGen = KeyGenerator.getInstance("AES");
        SecretKey key = keyGen.generateKey();

        KeyStore.ProtectionParameter protParam = new KeyStore.PasswordProtection(
                keystorePassword.toCharArray());

        KeyStore.SecretKeyEntry skEntry = new KeyStore.SecretKeyEntry(key);

        ks.setEntry(authTokenAlias, skEntry, protParam);

        java.io.FileOutputStream fos = null;
        try {

            fos = new java.io.FileOutputStream(keystoreFile);
            ks.store(fos, keystorePassword.toCharArray());
        } finally {

            if (fos != null) {
                fos.close();
            }
        }

        System.out.println("done");

    } catch (Exception e) {
        e.printStackTrace();
    }
}

---

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