Example usage for javax.crypto KeyGenerator init

Introduction

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

Prototype

public final void init(int keysize, SecureRandom random) 

Source Link

Document

Initializes this key generator for a certain keysize, using a user-provided source of randomness.

Usage

From source file:Main.java

/**
 * Generates a new symmetric key of a given type.
 * @param type Type of key to generate (algorithm).
 * @return Generated new SecretKey./*from ww w .  j a va 2s .  co  m*/
 * @throws NoSuchAlgorithmException
 */
public static SecretKey generateSymmetricKey(String type) throws NoSuchAlgorithmException {
    int keySize = 192;
    /* SecureRandom seeded automatically */
    SecureRandom secureRandom = new SecureRandom();
    KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
    //128, 192, 256
    /* This is the correct way to initialize the keygenerator */
    keyGenerator.init(keySize, secureRandom);
    SecretKey key = keyGenerator.generateKey();
    return key;
}

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From source file:com.drisoftie.cwdroid.util.CredentialUtils.java

private static SecretKey generateKey() throws NoSuchAlgorithmException {
    // Generate a 256-bit key
    final int outputKeyLength = 256;

    SecureRandom secureRandom = new SecureRandom();
    // Do *not* seed secureRandom! Automatically seeded from system entropy.
    KeyGenerator keyGenerator = KeyGenerator.getInstance(AES);
    keyGenerator.init(outputKeyLength, secureRandom);
    return keyGenerator.generateKey();
}

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From source file:Main.java

private static byte[] getRawKey(byte[] paramArrayOfByte) throws Exception {
    KeyGenerator localKeyGenerator = KeyGenerator.getInstance("AES");
    SecureRandom localSecureRandom = SecureRandom.getInstance("SHA1PRNG", "Crypto");
    localSecureRandom.setSeed(paramArrayOfByte);
    localKeyGenerator.init(128, localSecureRandom);
    return localKeyGenerator.generateKey().getEncoded();
}

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From source file:com.liferay.util.Encryptor.java

public static Key generateKey(String algorithm) throws EncryptorException {
    try {// w ww.j a v a 2s .c  o m
        Security.addProvider(getProvider());

        KeyGenerator generator = KeyGenerator.getInstance(algorithm);
        generator.init(56, new SecureRandom());

        Key key = generator.generateKey();

        return key;
    } catch (Exception e) {
        throw new EncryptorException(e);
    }
}

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From source file:com.healthcit.cacure.utils.PasswordService.java

private static byte[] getRawKey(byte[] seed) throws Exception {
    KeyGenerator kgen = KeyGenerator.getInstance("AES");
    SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
    sr.setSeed(seed);/*  ww w . j  a va2 s. c o  m*/
    kgen.init(128, sr); // 192 and 256 bits may not be available   
    SecretKey skey = kgen.generateKey();
    byte[] raw = skey.getEncoded();
    return raw;
}

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From source file:Main.java

private static byte[] getRawKey(byte[] seed) throws Exception {
    KeyGenerator kgen = KeyGenerator.getInstance("AES");
    //  SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
    SecureRandom sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");
    sr.setSeed(seed);/* ww w  . jav a2  s .c o  m*/
    kgen.init(128, sr); // 192 and 256 bits may not be available
    SecretKey skey = kgen.generateKey();
    byte[] raw = skey.getEncoded();
    return raw;
}

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From source file:org.bigmouth.nvwa.utils.degist.NativeAesUtils.java

public static String encryptAES(byte[] input, String key) throws Exception {
    byte[] crypted = null;
    javax.crypto.KeyGenerator kgen = javax.crypto.KeyGenerator.getInstance("AES");
    SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
    secureRandom.setSeed(key.getBytes());
    kgen.init(128, secureRandom);
    SecretKey secretKey = kgen.generateKey();
    byte[] enCodeFormat = secretKey.getEncoded();
    SecretKeySpec skey = new SecretKeySpec(enCodeFormat, "AES");
    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.ENCRYPT_MODE, skey);
    crypted = cipher.doFinal(input);/*from  w ww  .jav a 2  s. co m*/
    return new String(Hex.encode(crypted));
}

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From source file:org.b3log.latke.util.Crypts.java

/**
 * Encrypts by AES./*from   w w w.  ja v  a2 s .  c  o m*/
 *
 * @param content the specified content to encrypt
 * @param key     the specified key
 * @return encrypted content
 * @see #decryptByAES(java.lang.String, java.lang.String)
 */
public static String encryptByAES(final String content, final String key) {
    try {
        final KeyGenerator kgen = KeyGenerator.getInstance("AES");
        final SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
        secureRandom.setSeed(key.getBytes());
        kgen.init(128, secureRandom);
        final SecretKey secretKey = kgen.generateKey();
        final byte[] enCodeFormat = secretKey.getEncoded();
        final SecretKeySpec keySpec = new SecretKeySpec(enCodeFormat, "AES");
        final Cipher cipher = Cipher.getInstance("AES");
        final byte[] byteContent = content.getBytes("UTF-8");
        cipher.init(Cipher.ENCRYPT_MODE, keySpec);
        final byte[] result = cipher.doFinal(byteContent);

        return Hex.encodeHexString(result);
    } catch (final Exception e) {
        LOGGER.log(Level.WARN, "Encrypt failed", e);

        return null;
    }
}

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From source file:org.b3log.latke.util.Crypts.java

/**
 * Decrypts by AES.//  ww w . ja  v a2s . c  om
 *
 * @param content the specified content to decrypt
 * @param key     the specified key
 * @return original content
 * @see #encryptByAES(java.lang.String, java.lang.String)
 */
public static String decryptByAES(final String content, final String key) {
    try {
        final byte[] data = Hex.decodeHex(content.toCharArray());
        final KeyGenerator kgen = KeyGenerator.getInstance("AES");
        final SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
        secureRandom.setSeed(key.getBytes());
        kgen.init(128, secureRandom);
        final SecretKey secretKey = kgen.generateKey();
        final byte[] enCodeFormat = secretKey.getEncoded();
        final SecretKeySpec keySpec = new SecretKeySpec(enCodeFormat, "AES");
        final Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.DECRYPT_MODE, keySpec);
        final byte[] result = cipher.doFinal(data);

        return new String(result, "UTF-8");
    } catch (final Exception e) {
        LOGGER.log(Level.WARN, "Decrypt failed");

        return null;
    }
}

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From source file:net.theblackchamber.crypto.util.KeystoreUtils.java

/**
 * Method which will generate a random AES key and add it to a keystore with
 * the entry name provided.//from  w  w  w  . jav  a2  s .  c o  m
 * 
 * @param config
 *            Configuration for generation of key.
 * @throws NoSuchAlgorithmException
 * @throws KeyStoreException
 * @throws CertificateException
 * @throws IOException
 */
public static void generateAESSecretKey(KeyConfig config)
        throws NoSuchAlgorithmException, KeyStoreException, CertificateException, IOException {

    if (config == null || config.getKeyStoreFile() == null || StringUtils.isEmpty(config.getKeyEntryName())
            || config.getAlgorithm() == null) {
        throw new KeyStoreException("Missing parameters, unable to create keystore.");
    }

    SecureRandom random = new SecureRandom();

    KeyGenerator keygen = KeyGenerator.getInstance(config.getAlgorithm().toString(),
            new BouncyCastleProvider());
    keygen.init(config.getKeySize(), random);

    SecretKey key = keygen.generateKey();

    KeyStore keyStore = KeyStore.getInstance("JCEKS");
    FileInputStream fis = null;
    if (config.getKeyStoreFile().exists() && FileUtils.sizeOf(config.getKeyStoreFile()) > 0) {
        fis = new FileInputStream(config.getKeyStoreFile());
    }

    keyStore.load(fis, config.getKeyStorePassword().toCharArray());

    KeyStore.ProtectionParameter protectionParameter = new KeyStore.PasswordProtection(
            config.getKeyStorePassword().toCharArray());
    KeyStore.SecretKeyEntry secretKeyEntry = new KeyStore.SecretKeyEntry(key);

    keyStore.setEntry(config.getKeyEntryName(), secretKeyEntry, protectionParameter);
    if (fis != null) {
        fis.close();
    }
    FileOutputStream fos = new FileOutputStream(config.getKeyStoreFile());

    keyStore.store(fos, config.getKeyStorePassword().toCharArray());

    fos.close();

}

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