Example usage for java.security SecureRandom SecureRandom

Introduction

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

Prototype

public SecureRandom()

Source Link

Document

Constructs a secure random number generator (RNG) implementing the default random number algorithm.

Usage

From source file:crocserver.app.CrocSecurity.java

public static String createSecret() {
    byte[] bytes = new byte[10];
    new SecureRandom().nextBytes(bytes);
    return new Base32().encodeAsString(bytes);
}

From source file:com.aspose.showcase.qrcodegen.web.api.util.StringEncryptor.java

public static String encrypt(String data, String password) throws Exception {

    Security.addProvider(new BouncyCastleProvider());
    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding", "BC");

    final Random r = new SecureRandom();
    byte[] salt = new byte[SALT_SIZE];
    r.nextBytes(salt);//w w w .  j  a  va  2  s.c  o  m

    SecretKeyFactory fact = SecretKeyFactory.getInstance("PBEWITHMD5AND128BITAES-CBC-OPENSSL", "BC");

    cipher.init(Cipher.ENCRYPT_MODE,
            fact.generateSecret(new PBEKeySpec(password.toCharArray(), salt, PBE_KEY_SALE_SIZE)));

    byte[] encVal = cipher.doFinal(data.getBytes());

    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    // writing encrypted data along with the salt in the format readable by
    // open ssl api
    bos.write("Salted__".getBytes());
    bos.write(salt);
    bos.write(encVal);
    String encryptedValue = new String(Base64.encode(bos.toByteArray()));
    bos.close();

    return encryptedValue;

}

From source file:Logi.GSeries.Libraries.Encryption.java

public static String encrypt(String decryptedString, String password) {
    try {//from   w w  w. ja  va 2s  . com
        // build the initialization vector (randomly).
        SecureRandom random = new SecureRandom();
        byte initialVector[] = new byte[16];
        //generate random 16 byte IV AES is always 16bytes
        random.nextBytes(initialVector);
        IvParameterSpec ivspec = new IvParameterSpec(initialVector);
        SecretKeySpec skeySpec = new SecretKeySpec(password.getBytes("UTF-8"), "AES");
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, ivspec);
        byte[] encrypted = cipher.doFinal(decryptedString.getBytes());
        byte[] encryptedWithIV = new byte[encrypted.length + initialVector.length];
        System.arraycopy(encrypted, 0, encryptedWithIV, 0, encrypted.length);
        System.arraycopy(initialVector, 0, encryptedWithIV, encrypted.length, initialVector.length);
        return Base64.encodeBase64String(encryptedWithIV);
    } catch (Exception ex) {
        Logger.getLogger(Encryption.class.getName()).log(Level.SEVERE, null, ex);
        return "Error";
    }
}

From source file:com.iterzp.momo.utils.RSAUtils.java

/**
 * ?//from  w ww . j av a 2s  .  co m
 * 
 * @return 
 */
public static KeyPair generateKeyPair() {
    try {
        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA", PROVIDER);
        keyPairGenerator.initialize(KEY_SIZE, new SecureRandom());
        return keyPairGenerator.generateKeyPair();
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
        return null;
    }
}

From source file:Main.java

/**
 * Decrypts a encrypted and encoded message given a key.
 * @param cipherBytes//from w w w  .  j  a v a  2  s .co m
 * @param key
 * @return
 * @throws NoSuchAlgorithmException
 * @throws NoSuchAlgorithmException
 * @throws InvalidAlgorithmParameterException
 * @throws IllegalBlockSizeException
 * @throws BadPaddingException
 * @throws InvalidAlgorithmParameterException
 * @throws NoSuchPaddingException
 * @throws InvalidKeyException
 */
public static byte[] decryptMessage(byte[] cipherBytes, SecretKey key) throws NoSuchAlgorithmException,
        NoSuchAlgorithmException, InvalidAlgorithmParameterException, IllegalBlockSizeException,
        BadPaddingException, InvalidAlgorithmParameterException, NoSuchPaddingException, InvalidKeyException {
    Cipher cipher = Cipher.getInstance("AES");
    //ipher cipher = Cipher.getInstance("AES/CBC/PKCS7PADDING");
    byte[] init = new byte[128 / 8];
    SecureRandom secureRandom = new SecureRandom();
    //secureRandom.nextBytes(init);
    for (int i = 0; i < 16; i++)
        init[i] = 0;
    cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(init));
    byte[] textBytes = cipher.doFinal(cipherBytes);
    return textBytes;
}

From source file:Main.java

/**
 * Generate a random String//  w  ww  .  j  a  v a2s . c om
 *
 * @param values The characters list to use in the randomization
 * @param len The number of characters in the output String
 * @return The randomized String
 */
public static String randomString(char[] values, int len) {
    Random rnd = new SecureRandom();
    StringBuilder sb = new StringBuilder(len);
    for (int i = 0; i < len; i++) {
        sb.append(values[rnd.nextInt(values.length)]);
    }
    return sb.toString();
}

From source file:com.DSC.client.SecureChannel.java

/**
 * @param args/*from   ww  w  .  j a  v a  2  s  .c  o  m*/
 * @throws InterruptedException 
 * @throws IOException 
 */
public static void main(String[] args) throws InterruptedException, IOException {
    /* Create their private & public keys */
    ECKey key = new ECKey();
    key.init();
    ProgramState.publicKey = (ECPublicKeyParameters) key.getPublic();
    ProgramState.privateKey = (ECPrivateKeyParameters) key.getPrivate();

    /* Create the IV engine */
    byte[] seed = new byte[64]; // 512 bit seed 
    SecureRandom random = new SecureRandom();
    random.nextBytes(seed);
    ProgramState.IVEngine = new ISAACRandomGenerator(new ISAACEngine());
    ProgramState.IVEngine.init(seed);

    /* Create the blacklist and trusted contacts */
    ProgramState.blacklist = ConcurrentHashMultiset.create();
    ProgramState.trustedKeys = new ConcurrentHashMap<String, Address>();

    /* Set the time for the client accurately using a NTP server */
    DateTimeUtils.setCurrentMillisOffset(getTimeOffset());
    ProgramState.fmt = DateTimeFormat.forPattern("HH:mm:ss");

    /* Set the default nick as anonymous */
    ProgramState.nick = "anonymous";

    /* Initialize ISAACRandomGenerator, set ProgramState.IVEngine */
    receiveController = new ReceiveController();
    sendController = new SendController();

    /* Start input event handler loop */
    eventLoop();
}

From source file:MainClass.java

private static byte[] passwordEncrypt(char[] password, byte[] plaintext) throws Exception {
    int MD5_ITERATIONS = 1000;
    byte[] salt = new byte[8];
    SecureRandom random = new SecureRandom();
    random.nextBytes(salt);/* w  ww .j a v a2 s. c o m*/

    PBEKeySpec keySpec = new PBEKeySpec(password);
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBEWithSHAAndTwofish-CBC");
    SecretKey key = keyFactory.generateSecret(keySpec);
    PBEParameterSpec paramSpec = new PBEParameterSpec(salt, MD5_ITERATIONS);
    Cipher cipher = Cipher.getInstance("PBEWithSHAAndTwofish-CBC");
    cipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);

    byte[] ciphertext = cipher.doFinal(plaintext);

    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    baos.write(salt);
    baos.write(ciphertext);
    return baos.toByteArray();
}

From source file:Main.java

public static KeyPair genKeyPair() throws IOException, NoSuchAlgorithmException, InvalidKeySpecException,
        NoSuchProviderException, InvalidKeyException, SignatureException {
    KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA", "BC");
    keyPairGen.initialize(1024, new SecureRandom());
    KeyPair keypair = keyPairGen.genKeyPair();
    return keypair;
}

From source file:Main.java

private static boolean passesMillerRabin(BigInteger us, int iterations, Random rnd) {
    final BigInteger ONE = BigInteger.ONE;
    final BigInteger TWO = BigInteger.valueOf(2);
    // Find a and m such that m is odd and this == 1 + 2**a * m
    BigInteger thisMinusOne = us.subtract(ONE);
    BigInteger m = thisMinusOne;//from   www  . j a va  2  s . com
    int a = m.getLowestSetBit();
    m = m.shiftRight(a);

    // Do the tests
    if (rnd == null) {
        rnd = new SecureRandom();
    }
    for (int i = 0; i < iterations; i++) {
        // Generate a uniform random on (1, this)
        BigInteger b;
        do {
            b = new BigInteger(us.bitLength(), rnd);
        } while (b.compareTo(ONE) <= 0 || b.compareTo(us) >= 0);

        int j = 0;
        BigInteger z = b.modPow(m, us);
        while (!((j == 0 && z.equals(ONE)) || z.equals(thisMinusOne))) {
            if (j > 0 && z.equals(ONE) || ++j == a)
                return false;
            z = z.modPow(TWO, us);
        }
    }
    return true;
}