Example usage for java.security SecureRandom nextBytes

Introduction

In this page you can find the example usage for java.security SecureRandom nextBytes.

Prototype

@Override
public void nextBytes(byte[] bytes)

Source Link

Document

Generates a user-specified number of random bytes.

Usage

From source file:Main.java

public static String encryptData(String password, String plaintextData) throws Exception {
    // Thank you Mr. Nelenkov
    String maybeThisHelps = "http://nelenkov.blogspot.com/2012/04/using-password-based-encryption-on.html";
    Log.v(TAG, maybeThisHelps);/*from  w  w  w.  ja v a2  s. c  om*/
    int iterationCount = 100; //because Polaroid
    int keyLength = 256;
    int saltLength = keyLength;

    SecureRandom random = new SecureRandom();
    byte[] salt = new byte[saltLength];
    random.nextBytes(salt);
    KeySpec keySpec = new PBEKeySpec(password.toCharArray(), salt, iterationCount, keyLength);
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
    byte[] keyBytes = keyFactory.generateSecret(keySpec).getEncoded();
    SecretKey key = new SecretKeySpec(keyBytes, "AES");

    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    byte[] iv = new byte[cipher.getBlockSize()];
    random.nextBytes(iv);

    IvParameterSpec ivParams = new IvParameterSpec(iv);
    cipher.init(Cipher.ENCRYPT_MODE, key, ivParams);
    byte[] ciphertext = cipher.doFinal(plaintextData.getBytes("UTF-8"));

    String ivToString = new String(Base64.encode(iv, 0));
    String saltToString = new String(Base64.encode(salt, 0));
    String ciphertextToString = new String(Base64.encode(ciphertext, 0));

    Log.d(TAG, ivToString + "]" + saltToString + "]" + ciphertextToString);
    return (ivToString + "]" + saltToString + "]" + ciphertextToString).replace("\n", "");
}

From source file:org.wso2.carbon.identity.oidc.session.DefaultOIDCSessionStateManager.java

private static String generateSaltValue() throws NoSuchAlgorithmException {

    byte[] bytes = new byte[16];
    SecureRandom secureRandom = SecureRandom.getInstance(RANDOM_ALG_SHA1);
    secureRandom.nextBytes(bytes);
    return Base64.encodeBase64URLSafeString(bytes);
}

From source file:ru.org.linux.csrf.CSRFProtectionService.java

public static void generateCSRFCookie(HttpServletRequest request, HttpServletResponse response) {
    SecureRandom random = new SecureRandom();

    byte[] value = new byte[16];
    random.nextBytes(value);

    String token = new String(Base64.encodeBase64(value));

    Cookie cookie = new Cookie(CSRF_COOKIE, token);
    cookie.setMaxAge(TWO_YEARS);//from   w ww .jav a2  s.  c  o  m
    cookie.setPath("/");
    response.addCookie(cookie);

    request.setAttribute(CSRF_ATTRIBUTE, token);
}

From source file:com.ec2box.manage.util.EncryptionUtil.java

/**
 * generate salt for hash// w  w w  .  ja  va  2  s . c om
 *
 * @return salt
 */
public static String generateSalt() {
    byte[] salt = new byte[32];
    SecureRandom secureRandom = new SecureRandom();
    secureRandom.nextBytes(salt);
    return new String(Base64.encodeBase64(salt));
}

From source file:com.github.woki.payments.adyen.action.CSEUtil.java

private static synchronized byte[] iv(SecureRandom random, int ivSize) {
    byte[] iv = new byte[ivSize];
    random.nextBytes(iv);
    return iv;/* ww  w . j  ava  2 s  .  c  om*/
}

From source file:com.zimbra.cs.account.PreAuthKey.java

public static String generateRandomPreAuthKey() throws ServiceException {
    try {/*from   w  w w. ja  v a2s.  c  o m*/
        SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
        byte[] key = new byte[KEY_SIZE_BYTES];
        random.nextBytes(key);
        return new String(Hex.encodeHex(key));
    } catch (NoSuchAlgorithmException e) {
        throw ServiceException.FAILURE("unable to initialize SecureRandom", e);
    }
}

From source file:de.tntinteractive.portalsammler.engine.CryptoHelper.java

public static byte[] generateKey(final SecureRandom srand) throws NoSuchAlgorithmException {
    final byte[] key = new byte[256 / 8];
    srand.nextBytes(key);
    return key;//from www . j  a va 2s .  c  o m
}

From source file:com.apabi.r2k.common.security.util.NonceUtils.java

/**
 * SecureRandom?, Hex?.//w  w w.  ja  v a2 s  . c  o m
 * 
 * @param length ,?.
 */
public static String randomHexString(final int length) {
    SecureRandom nonceGenerator = new SecureRandom();
    byte[] nonce = new byte[length / 2];
    nonceGenerator.nextBytes(nonce);
    return Hex.encodeHexString(nonce);
}

From source file:svnserver.ext.web.config.WebServerConfig.java

private static String generateDefaultSecret() {
    final SecureRandom random = new SecureRandom();
    final byte bytes[] = new byte[EncryptionFactoryAes.KEY_SIZE];
    random.nextBytes(bytes);
    return new String(Hex.encodeHex(bytes));
}

From source file:Main.java

public static String generateNonce() {
    try {//from  w  ww. j  a v a 2  s.c o m
        // Create a secure random number generator
        SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");

        // Get 1024 random bits
        byte[] bytes = new byte[1024 / 8];
        sr.nextBytes(bytes);

        // Create two secure number generators with the same seed
        int seedByteCount = 10;
        byte[] seed = sr.generateSeed(seedByteCount);

        sr = SecureRandom.getInstance("SHA1PRNG");
        sr.setSeed(seed);
        SecureRandom sr2 = SecureRandom.getInstance("SHA1PRNG");
        sr2.setSeed(seed);

        String nonce = Long.toHexString(sr2.nextLong());
        nonce = nonce.substring(0, 7);

        return nonce;

    } catch (NoSuchAlgorithmException e) {
    }
    return null;
}