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:TripleDES.java

/** Generate a secret TripleDES encryption/decryption key */
public static SecretKey generateKey() throws NoSuchAlgorithmException {
    // Get a key generator for Triple DES (a.k.a DESede)
    KeyGenerator keygen = KeyGenerator.getInstance("DESede");
    // Use it to generate a key
    return keygen.generateKey();
}

From source file:com.gfw.press.encrypt.Encrypt.java

public Encrypt() {
    super();//from w  w w  . ja va 2s.  c  o  m
    secureRandom = new SecureRandom();
    try {
        cipher = Cipher.getInstance("AES/CFB/NoPadding");
        keyGenerator = KeyGenerator.getInstance("AES");
    } catch (NoSuchAlgorithmException | NoSuchPaddingException ex) {
        throw new RuntimeException(ex);
    }
}

From source file:tagtime.random.RandomSequenceGenerator.java

/**
 * Creates a new <code>RandomSequenceGenerator</code> with a
 * user-provided key. Use this if you want consistent pseudo-random
 * numbers across multiple executions or generators.
 * @param keyString The encryption key to use. No safety checking is
 *            performed, and weak keys will be accepted. If this is
 *            null or empty, an automatically-generated key will be
 *            used instead./* ww  w . j a v  a2s  .  c  om*/
 * @throws NoSuchAlgorithmException If Java has dropped support for
 *             AES (not likely).
 * @throws NoSuchPaddingException If Java has dropped support for AES
 *             (not likely).
 * @throws InvalidKeyException If the user modifies their RNG_KEY
 *             setting to a value that cannot be used as an AES key.
 *             This may or may not be possible (untested).
 */
public RandomSequenceGenerator(String keyString)
        throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException {
    //generate or parse the key
    if (keyString == null || keyString.equals("")) {
        key = KeyGenerator.getInstance("AES").generateKey();
    } else {
        key = new SecretKeySpec(Base64.decodeBase64(keyString), "AES");
    }

    //set up the cipher that will be used to generate pseudo-random numbers
    cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.ENCRYPT_MODE, key);
}

From source file:org.lightjason.agentspeak.action.buildin.crypto.EAlgorithm.java

/**
 * generates a key// ww  w . jav  a  2s  .com
 *
 * @return key pair object (public key / private key or null)
 *
 * @throws NoSuchAlgorithmException on algorithm error
 */
public final Pair<Key, Key> generateKey() throws NoSuchAlgorithmException {
    switch (this) {
    case AES:
    case DES:
        return new ImmutablePair<>(KeyGenerator.getInstance(m_key).generateKey(), null);

    case RSA:
        final KeyPair l_key = KeyPairGenerator.getInstance(m_key).generateKeyPair();
        return new ImmutablePair<>(l_key.getPublic(), l_key.getPrivate());

    default:
        throw new CIllegalStateException(CCommon.languagestring(this, "unknown", this));
    }
}

From source file:org.apache.ws.security.message.SymmetricSignatureTest.java

/**
 * Setup method/*from ww w . j a  va 2  s  .c  o m*/
 * <p/>
 * 
 * @throws Exception Thrown when there is a problem in setup
 */
@org.junit.Before
public void setUp() throws Exception {
    KeyGenerator keyGen = KeyGenerator.getInstance("AES");
    keyGen.init(128);
    SecretKey key = keyGen.generateKey();
    keyData = key.getEncoded();
}

From source file:info.fcrp.keepitsafe.bean.CryptBeanTest.java

@Test
public void symetric() throws NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException,
        InvalidKeyException, IllegalBlockSizeException, BadPaddingException {

    KeyGenerator kg = KeyGenerator.getInstance("AES");
    kg.init(256, new SecureRandom());
    Key k = kg.generateKey();//  w  w w.  j a  v  a2s  . c o  m

    Cipher c = Cipher.getInstance("AES");
    String plain = "plain";
    byte[] plainBytes = plain.getBytes();

    c.init(Cipher.ENCRYPT_MODE, k);
    c.update(plainBytes);

    byte[] encBytes = c.doFinal();
    String enc = Base64.encodeBase64String(encBytes);
    assertNotSame(plain, enc);

    c.init(Cipher.DECRYPT_MODE, k);
    c.update(encBytes);
    byte[] decBytes = c.doFinal();
    String dec = new String(decBytes);

    assertEquals(plain, dec);
}

From source file:org.lightjason.agentspeak.action.builtin.crypto.EAlgorithm.java

/**
 * generates a key//from   ww  w.ja v a2s.  c  o m
 *
 * @return key pair object (public key / private key or null)
 *
 * @throws NoSuchAlgorithmException on algorithm error
 */
@Nonnull
public final Pair<Key, Key> generateKey() throws NoSuchAlgorithmException {
    switch (this) {
    case AES:
    case DES:
        return new ImmutablePair<>(KeyGenerator.getInstance(m_key).generateKey(), null);

    case RSA:
        final KeyPair l_key = KeyPairGenerator.getInstance(m_key).generateKeyPair();
        return new ImmutablePair<>(l_key.getPublic(), l_key.getPrivate());

    default:
        throw new CIllegalStateException(CCommon.languagestring(this, "unknown", this));
    }
}

From source file:org.paxml.util.CryptoUtils.java

public static String decrypt(byte[] data, String password) {
    SecretKey SecKey = getSecretKey(password);
    try {/*from w w w .j  a v  a  2  s. c o m*/
        KeyGenerator KeyGen = KeyGenerator.getInstance(KEY_TYPE);
        KeyGen.init(KEY_LENGTH_BITS);

        Cipher cipher = Cipher.getInstance(KEY_TYPE);

        cipher.init(Cipher.DECRYPT_MODE, SecKey);
        byte[] clear = cipher.doFinal(data);
        return new String(clear, KEY_VALUE_ENCODING);
    } catch (Exception e) {
        throw new PaxmlRuntimeException(e);
    }
}

From source file:com.demandware.vulnapp.challenge.impl.ECBOracleChallenge.java

/**
 * Generate some key such that we don't know the key value so noone can just
 * use the key/*from w ww .ja  v  a  2  s.c  om*/
 */
private SecretKey generateKey() throws NoSuchAlgorithmException {
    KeyGenerator keyGen = KeyGenerator.getInstance(this.keyType);
    return keyGen.generateKey();
}

From source file:ezbake.security.service.sync.LocksmithKeySupplierTest.java

String getAESKey() throws NoSuchAlgorithmException {
    KeyGenerator keygenerator = KeyGenerator.getInstance("AES");
    keygenerator.init(256);//from w  ww . j  av  a  2  s  .c om
    return Base64.encodeBase64String(keygenerator.generateKey().getEncoded());
}