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:org.openTwoFactor.clientExt.edu.internet2.middleware.morphString.Crypto.java

/**
 * Generate a key./*from  ww  w .j  av  a 2 s.co  m*/
 * @param cipherName the name of the cipher, if null will default to "AES"
 * @param keybits the number of bits in the key, if null will default to 128
 * @return the bytes comprising the key
 */
public static byte[] generateKeyBytes(String cipherName, Integer keybits) {
    KeyGenerator keyGenerator = null;
    cipherName = cipherName == null ? "AES" : cipherName;
    try {
        keyGenerator = KeyGenerator.getInstance(cipherName);
    } catch (NoSuchAlgorithmException e) {
        throw new RuntimeException("Failed to create KeyGenerator for cipherName=" + cipherName, e);
    }
    keyGenerator.init(keybits == null ? 128 : keybits); // 192 and 256 bits may not be available

    // Generate the secret key specs.
    SecretKey secretKey = keyGenerator.generateKey();
    byte[] keyBytes = secretKey.getEncoded();

    return keyBytes;
}

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From source file:sec_algo.commonenc.java

/**
* Creates a new AES key//from   w w  w.jav  a 2 s . c o  m
*/
public void makeKey() {
    try {
        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        kgen.init(AES_Key_Size);
        SecretKey aeskey = kgen.generateKey();
        key = aeskey.getEncoded();
        secretkey = new SecretKeySpec(key, "AES");
    } catch (Exception e) {
        e.printStackTrace();
    }
}

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From source file:es.jamisoft.comun.utils.cipher.Cifrado3DES.java

private SecretKey generaDesKey() {
    try {/*  w  w  w .  jav a 2s .c o  m*/
        KeyGenerator keygen = KeyGenerator.getInstance("DESede");

        return keygen.generateKey();
    } catch (Exception e) {
        System.out.println("Error descifrando un texto:" + e);
        e.printStackTrace();

        return null;
    }
}

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From source file:servlets.SecretKeyProvider.java

/**
 * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
 * methods.//from   w ww .  ja  v  a 2 s . c o  m
 *
 * @param request servlet request
 * @param response servlet response
 * @throws ServletException if a servlet-specific error occurs
 * @throws IOException if an I/O error occurs
 */
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {

    String opcion = request.getParameter("opcion");

    switch (opcion) {
    case "public":
        InputStream is = getServletContext().getResourceAsStream("/WEB-INF/server1024.publica");
        IOUtils.copy(is, response.getOutputStream());
        break;

    case "secret": {
        try {
            SecretKey secretKey = KeyGenerator.getInstance("AES").generateKey();
            request.getSession().setAttribute("clave", secretKey);

            Security.addProvider(new BouncyCastleProvider()); // Cargar el provider BC
            Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
            Cipher cifrador = Cipher.getInstance("RSA/ECB/PKCS1Padding", "BC");

            KeyFactory keyFactoryRSA = KeyFactory.getInstance("RSA", "BC"); // Hace uso del provider BC

            byte[] bufferPriv = new byte[5000];
            InputStream in = getServletContext().getResourceAsStream("/WEB-INF/server1024.privada");
            int chars = in.read(bufferPriv, 0, 5000);
            in.close();

            byte[] bufferPriv2 = new byte[chars];
            System.arraycopy(bufferPriv, 0, bufferPriv2, 0, chars);

            // 2.2 Recuperar clave privada desde datos codificados en formato PKCS8
            PKCS8EncodedKeySpec clavePrivadaSpec = new PKCS8EncodedKeySpec(bufferPriv2);
            PrivateKey clavePrivada2 = keyFactoryRSA.generatePrivate(clavePrivadaSpec);

            // PASO 3a: Poner cifrador en modo CIFRADO
            cifrador.init(Cipher.ENCRYPT_MODE, clavePrivada2); // Cifra con la clave publica

            byte[] bufferCifrado = cifrador.doFinal(secretKey.getEncoded());

            String mandar = new String(Base64.encodeBase64(bufferCifrado));
            response.getWriter().print(mandar);

        } catch (NoSuchAlgorithmException ex) {
            Logger.getLogger(SecretKeyProvider.class.getName()).log(Level.SEVERE, null, ex);
        } catch (NoSuchProviderException ex) {
            Logger.getLogger(SecretKeyProvider.class.getName()).log(Level.SEVERE, null, ex);
        } catch (NoSuchPaddingException ex) {
            Logger.getLogger(SecretKeyProvider.class.getName()).log(Level.SEVERE, null, ex);
        } catch (InvalidKeySpecException ex) {
            Logger.getLogger(SecretKeyProvider.class.getName()).log(Level.SEVERE, null, ex);
        } catch (InvalidKeyException ex) {
            Logger.getLogger(SecretKeyProvider.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IllegalBlockSizeException ex) {
            Logger.getLogger(SecretKeyProvider.class.getName()).log(Level.SEVERE, null, ex);
        } catch (BadPaddingException ex) {
            Logger.getLogger(SecretKeyProvider.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
    }
}

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From source file:se.vgregion.portal.cs.util.CryptoUtilImpl.java

/**
 * Encrypt a value and generate a keyfile. if the keyfile is not found then a new one is created
 * //from  ww w  .  java  2 s  .  com
 * @param value
 *            - value to be encrypted
 * @throws GeneralSecurityException
 *             - security exception
 * @return Encrypted value
 */
@Override
public String encrypt(String value) throws GeneralSecurityException {
    if (!keyFile.exists()) {
        KeyGenerator keyGen = KeyGenerator.getInstance(AES);
        keyGen.init(KEY_SIZE);
        SecretKey sk = keyGen.generateKey();
        FileWriter fw = null;
        try {
            fw = new FileWriter(keyFile);
            fw.write(byteArrayToHexString(sk.getEncoded()));
            fw.flush();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                fw.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    SecretKeySpec sks = getSecretKeySpec();

    Cipher cipher = Cipher.getInstance(AES);
    cipher.init(Cipher.ENCRYPT_MODE, sks, cipher.getParameters());
    byte[] encrypted = cipher.doFinal(value.getBytes());
    return byteArrayToHexString(encrypted);
}

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From source file:Main.java

/**
 * Generate a symmetric DES3 key.//from   www.  j  a  va2s  . c  o  m
 *
 * @return A DES3 key
 */
public static SecretKey generateSymmetricKey() throws NoSuchAlgorithmException {
    KeyGenerator symmetricKeyGenerator = KeyGenerator.getInstance(symmetricAlgorithm);
    return symmetricKeyGenerator.generateKey();
}

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From source file:de.hybris.platform.b2b.punchout.services.impl.SymmetricManager.java

public static String getKey() {
    String key = null;//ww  w .java  2s  . c o  m
    try {
        final KeyGenerator kgen = KeyGenerator.getInstance(ALGORITHM);
        kgen.init(KEY_SIZE);
        // Generate the secret key specs.
        final SecretKey skey = kgen.generateKey();
        final byte[] raw = skey.getEncoded();
        key = new Base64().encodeAsString(raw);
    } catch (final NoSuchAlgorithmException e) {
        // should never happen
        LOG.error("System was unable to generate the key.", e);
    }
    return key;
}

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From source file:com.evolveum.midpoint.init.ConfigurableProtectorFactory.java

public void init() {
    Configuration config = configuration.getConfiguration(PROTECTOR_CONFIGURATION);
    protectorConfig = new ProtectorConfiguration(config);

    //Extract file if not exists
    if (config.getString("midpoint.home") == null) {
        return;//  w  w w. j av  a 2s.  c  o m
    }

    File ks = new File(protectorConfig.getKeyStorePath());
    if (ks.exists()) {
        return;
    }

    //todo improve
    FileOutputStream fos = null;
    try {
        KeyStore keystore = KeyStore.getInstance("jceks");
        char[] password = "changeit".toCharArray();

        keystore.load(null, password);

        KeyGenerator keyGen = KeyGenerator.getInstance("AES");
        keyGen.init(128);
        SecretKey secretKey = keyGen.generateKey();

        keystore.setKeyEntry("default", secretKey, "midpoint".toCharArray(), null);

        fos = new FileOutputStream(protectorConfig.getKeyStorePath());
        keystore.store(fos, password);
        fos.close();
    } catch (Exception ex) {
        throw new SystemException("Couldn't generate keystore, reason: " + ex.getMessage(), ex);
    } finally {
        IOUtils.closeQuietly(fos);
    }
}

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From source file:br.com.manish.ahy.kernel.util.HashUtil.java

private static Cipher getCipher(boolean enc)
        throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException {
    KeyGenerator kgen = KeyGenerator.getInstance("AES");
    kgen.init(128);// w  ww .j a  va 2s  . co  m
    SecretKeySpec skeySpec = new SecretKeySpec(getBytes(HEXES2), "AES");
    Cipher cipher = Cipher.getInstance("AES");
    if (enc) {
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
    } else {
        cipher.init(Cipher.DECRYPT_MODE, skeySpec);
    }
    return cipher;
}

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From source file:test.unit.org.owasp.webscarab.plugin.saml.SamlTest.java

@Test
public void testEncryptionAES() throws Exception {
    KeyGenerator keygen = KeyGenerator.getInstance("AES");
    keygen.init(128);//from   w  w w . ja v a  2s. co m
    SecretKey secretKey = keygen.generateKey();

    LOG.debug("secret key algo: " + secretKey.getAlgorithm());
    LOG.debug("secret key format: " + secretKey.getFormat());

    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.ENCRYPT_MODE, secretKey);
    LOG.debug("cipher provider: " + cipher.getProvider().getName());
    byte[] result = cipher.doFinal("hello world".getBytes());
    assertNotNull(result);

    byte[] encodedSecretKey = secretKey.getEncoded();
    LOG.debug("encoded secret key size: " + encodedSecretKey.length * 8);

    // decrypt
    cipher = Cipher.getInstance("AES");
    SecretKeySpec secretKeySpec = new SecretKeySpec(encodedSecretKey, "AES");
    cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);
    byte[] decryptedResult = cipher.doFinal(result);
    assertEquals("hello world", new String(decryptedResult));
}

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