Example usage for java.util Random nextBytes

Introduction

In this page you can find the example usage for java.util Random nextBytes.

Prototype

public void nextBytes(byte[] bytes) 

Source Link

Document

Generates random bytes and places them into a user-supplied byte array.

Usage

From source file:org.apache.hadoop.hbase.io.hfile.TestHFileBlock.java

static int writeTestKeyValues(HFileBlock.Writer hbw, int seed, boolean includesMemstoreTS, boolean useTag)
        throws IOException {
    List<KeyValue> keyValues = new ArrayList<KeyValue>();
    Random randomizer = new Random(42l + seed); // just any fixed number

    // generate keyValues
    for (int i = 0; i < NUM_KEYVALUES; ++i) {
        byte[] row;
        long timestamp;
        byte[] family;
        byte[] qualifier;
        byte[] value;

        // generate it or repeat, it should compress well
        if (0 < i && randomizer.nextFloat() < CHANCE_TO_REPEAT) {
            row = keyValues.get(randomizer.nextInt(keyValues.size())).getRow();
        } else {/*w  w w . j  a va2 s .com*/
            row = new byte[FIELD_LENGTH];
            randomizer.nextBytes(row);
        }
        if (0 == i) {
            family = new byte[FIELD_LENGTH];
            randomizer.nextBytes(family);
        } else {
            family = keyValues.get(0).getFamily();
        }
        if (0 < i && randomizer.nextFloat() < CHANCE_TO_REPEAT) {
            qualifier = keyValues.get(randomizer.nextInt(keyValues.size())).getQualifier();
        } else {
            qualifier = new byte[FIELD_LENGTH];
            randomizer.nextBytes(qualifier);
        }
        if (0 < i && randomizer.nextFloat() < CHANCE_TO_REPEAT) {
            value = keyValues.get(randomizer.nextInt(keyValues.size())).getValue();
        } else {
            value = new byte[FIELD_LENGTH];
            randomizer.nextBytes(value);
        }
        if (0 < i && randomizer.nextFloat() < CHANCE_TO_REPEAT) {
            timestamp = keyValues.get(randomizer.nextInt(keyValues.size())).getTimestamp();
        } else {
            timestamp = randomizer.nextLong();
        }
        if (!useTag) {
            keyValues.add(new KeyValue(row, family, qualifier, timestamp, value));
        } else {
            keyValues.add(new KeyValue(row, family, qualifier, timestamp, value,
                    new Tag[] { new Tag((byte) 1, Bytes.toBytes("myTagVal")) }));
        }
    }

    // sort it and write to stream
    int totalSize = 0;
    Collections.sort(keyValues, KeyValue.COMPARATOR);

    for (KeyValue kv : keyValues) {
        totalSize += kv.getLength();
        if (includesMemstoreTS) {
            long memstoreTS = randomizer.nextLong();
            kv.setMvccVersion(memstoreTS);
            totalSize += WritableUtils.getVIntSize(memstoreTS);
        }
        hbw.write(kv);
    }
    return totalSize;
}

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From source file:com.cyberninjas.xerobillableexpenses.util.Settings.java

public Settings() {
    try {/*from  ww w  .ja va2 s . c  om*/
        String parentClass = new Exception().getStackTrace()[1].getClassName();
        this.prefs = Preferences.userNodeForPackage(Class.forName(parentClass));
        Random r = new SecureRandom();

        //Set IV
        this.iv = prefs.getByteArray("DRUGS", null);

        //Pick Random PWD
        byte[] b = new byte[128];
        r.nextBytes(b);
        MessageDigest sha = MessageDigest.getInstance("SHA-1");
        sha.update(b);
        String sHash = new String(Base64.encodeBase64(sha.digest()));

        String password = prefs.get("LAYOUT", sHash);
        if (password.equals(sHash))
            prefs.put("LAYOUT", sHash);

        //Keep 'em Guessing
        r.nextBytes(b);
        sha.update(b);
        prefs.put("PASSWORD", new String(Base64.encodeBase64(sha.digest())));

        //Set Random Salt
        byte[] tSalt = new byte[8];
        r.nextBytes(tSalt);
        byte[] salt = prefs.getByteArray("HIMALAYAN", tSalt);
        if (Arrays.equals(salt, tSalt))
            prefs.putByteArray("HIMALAYAN", salt);

        /* Derive the key, given password and salt. */
        SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
        KeySpec spec = new PBEKeySpec(password.toCharArray(), salt, 65536, 128);
        SecretKey tmp = factory.generateSecret(spec);
        this.secret = new SecretKeySpec(tmp.getEncoded(), "AES");

        cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    } catch (NoSuchAlgorithmException ex) {
        Logger.getLogger(RSAx509CertGen.class.getName()).log(Level.SEVERE, null, ex);
    } catch (InvalidKeySpecException ex) {
        Logger.getLogger(RSAx509CertGen.class.getName()).log(Level.SEVERE, null, ex);
    } catch (Exception ex) {
        Logger.getLogger(RSAx509CertGen.class.getName()).log(Level.SEVERE, null, ex);
    }

}

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From source file:it.jnrpe.net.JNRPEProtocolPacket.java

/**
 * Initializes the arrays with random data. Not sure it is really needed...
 *///  ww w .  j a  v a  2 s.c  o m
private void initRandomBuffer() {
    Random rnd = new Random(System.currentTimeMillis());

    rnd.nextBytes(byteBufferAry);
    rnd.nextBytes(dummyBytesAry);
}

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From source file:org.standard.bestpratice.security.Secure.java

public void encodeRampartNonce() {
    Random random = null;
    try {//from  w  ww .j av a  2s  .  com
        random = SecureRandom.getInstance("SHA1PRNG");
        random.setSeed(System.currentTimeMillis());
    } catch (final NoSuchAlgorithmException ex) {
        LOG.error("Sha 1 not find", ex);
    }
    final byte[] r = new byte[16];
    random.nextBytes(r);
    String nonceBase64 = Base64.encodeBase64String(r);

    LOG.debug(r.toString());
    nonceBase64 = nonceBase64.replaceAll("[\r\n]+", "");
    LOG.debug(nonceBase64);
    LOG.debug("saut de ligne");
    //dHxHn8NcEjzaQ4KQX6j27Q==
    //ZlMIni/fEyY4qpBCJXAIxQ==
    //tAzmLb8dbvHtHARq1EF5OQ==
    //0BoFd08zqh1z8htR9WqtrUCayXY=
}

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From source file:org.apache.accumulo.test.UserCompactionStrategyIT.java

void writeRandomValue(Connector c, String tableName, int size) throws Exception {
    Random rand = new Random();

    byte data1[] = new byte[size];
    rand.nextBytes(data1);

    BatchWriter bw = c.createBatchWriter(tableName, new BatchWriterConfig());

    Mutation m1 = new Mutation("r" + rand.nextInt(909090));
    m1.put("data", "bl0b", new Value(data1));

    bw.addMutation(m1);//from  www.  j a v a  2s .  co  m
    bw.close();
    c.tableOperations().flush(tableName, null, null, true);
}

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From source file:org.apache.hadoop.hbase.regionserver.throttle.TestFlushWithThroughputController.java

private Store generateAndFlushData() throws IOException {
    HBaseAdmin admin = TEST_UTIL.getHBaseAdmin();
    if (admin.tableExists(tableName)) {
        admin.disableTable(tableName);//w  w w  .j av  a 2s.  c o  m
        admin.deleteTable(tableName);
    }
    Table table = TEST_UTIL.createTable(tableName, family);
    Random rand = new Random();
    for (int i = 0; i < 10; i++) {
        for (int j = 0; j < 10; j++) {
            byte[] value = new byte[256 * 1024];
            rand.nextBytes(value);
            table.put(new Put(Bytes.toBytes(i * 10 + j)).addColumn(family, qualifier, value));
        }
        admin.flush(tableName);
    }
    return getStoreWithName(tableName);
}

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From source file:org.jbpm.mock.EsbActionHandler.java

public void execute(ExecutionContext executionContext) {
    log.debug("invoking " + esbCategoryName + "::" + esbServiceName);
    try {//from  w  w w.  j ava  2s.  c o  m
        for (Iterator i = bpmToEsbVars.elementIterator(); i.hasNext();) {
            Element bpmToEsbVar = (Element) i.next();
            String var = bpmToEsbVar.attributeValue("bpm");
            Object value = executionContext.getVariable(var);
            log.debug("read " + value + " from variable " + var);
        }
        Random random = new Random();
        for (Iterator i = esbToBpmVars.elementIterator(); i.hasNext();) {
            Element esbToBpmVar = (Element) i.next();
            String var = esbToBpmVar.attributeValue("bpm");
            byte[] value = new byte[random.nextInt(2048)];
            random.nextBytes(value);
            executionContext.setVariable(var, value);
            log.debug("wrote " + value.length + " bytes to variable " + var);
        }
        executionContext.leaveNode();
    } catch (RuntimeException e) {
        if (DbPersistenceService.isPersistenceException(e))
            throw e;
        log.debug("possibly recoverable exception in esb action", e);
        executionContext.leaveNode(exceptionTransition);
    }
}

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From source file:org.broadinstitute.gatk.utils.io.IOUtilsUnitTest.java

private byte[] getDeterministicRandomData(int size) {
    Utils.resetRandomGenerator();/*from www.ja v  a 2s .  com*/
    Random rand = Utils.getRandomGenerator();

    byte[] randomData = new byte[size];
    rand.nextBytes(randomData);

    return randomData;
}

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From source file:com.palantir.atlasdb.schema.stream.StreamTest.java

private long storeAndCheckExpiringByteStreams(int size) throws IOException {
    final byte[] bytesToStore = new byte[size];
    Random rand = new Random();
    rand.nextBytes(bytesToStore);

    final long id = timestampService.getFreshTimestamp();
    StreamTestWithHashStreamStore store = StreamTestWithHashStreamStore.of(txManager,
            StreamTestTableFactory.of());
    store.storeStream(id, new ByteArrayInputStream(bytesToStore), 5, TimeUnit.SECONDS);

    verifyLoadingStreams(id, bytesToStore, store);

    return id;//from  w w  w. j  a  va2  s  .c om
}

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From source file:org.openacs.HostsBean.java

public void RequestConnectionUDP(String url, String user, String pass) throws Exception {
    DatagramSocket s = new DatagramSocket(null);
    s.setReuseAddress(true);/*from  w w w .j av a 2s.  c o m*/
    s.bind(new InetSocketAddress(Application.getSTUNport()));
    String ts = Long.toString(Calendar.getInstance().getTimeInMillis());
    String id = ts;
    Random rnd = new Random();
    byte[] nonceArray = new byte[16];
    rnd.nextBytes(nonceArray);

    String cn = cvtHex.cvtHex(nonceArray);
    url = url.substring(6);
    String[] u = url.split(":");

    SecretKeySpec signingKey = new SecretKeySpec(pass.getBytes(), HMAC_SHA1_ALGORITHM);
    Mac mac = Mac.getInstance(HMAC_SHA1_ALGORITHM);
    mac.init(signingKey);
    String data = ts + id + user + cn;
    byte[] rawHmac = mac.doFinal(data.getBytes());
    String signature = cvtHex.cvtHex(rawHmac);
    String req = "GET http://" + url + "?ts=" + ts + "&id=" + id + "&un=" + user + "&cn=" + cn + "&sig="
            + signature + " HTTP/1.1\r\n\r\n";

    byte[] breq = req.getBytes();
    DatagramPacket packet = new DatagramPacket(breq, breq.length);
    packet.setAddress(InetAddress.getByName(u[0]));
    packet.setPort(Integer.parseInt(u[1]));
    s.send(packet);
}

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