Examples of java.security.SecureRandom

java.security.SecureRandom
nist.gov/cryptval/140-2.htm"> FIPS 140-2, Security Requirements for Cryptographic Modules, section 4.9.1. Additionally, SecureRandom must produce non-deterministic output. Therefore any seed material passed to a SecureRandom object must be unpredictable, and all SecureRandom output sequences must be cryptographically strong, as described in RFC 1750: Randomness Recommendations for Security.
A caller obtains a SecureRandom instance via the no-argument constructor or one of the getInstance methods:
```
 SecureRandom random = new SecureRandom(); 
```
Many SecureRandom implementations are in the form of a pseudo-random number generator (PRNG), which means they use a deterministic algorithm to produce a pseudo-random sequence from a true random seed. Other implementations may produce true random numbers, and yet others may use a combination of both techniques.
Typical callers of SecureRandom invoke the following methods to retrieve random bytes:
```
 SecureRandom random = new SecureRandom(); byte bytes[] = new byte[20]; random.nextBytes(bytes); 
```
Callers may also invoke the generateSeed method to generate a given number of seed bytes (to seed other random number generators, for example):
```
 byte seed[] = random.generateSeed(20); 
```
@see java.security.SecureRandomSpi @see java.util.Random @version 1.54, 04/21/06 @author Benjamin Renaud @author Josh Bloch

    @Override
    public void setSystemPassword(String systemPassword) {
        // set new salt value, if we didn't have any.
        if (getSystemPasswordSalt().isEmpty()) {
            LOG.debug("Generating new salt for LDAP system password.");
            final SecureRandom random = new SecureRandom();
            byte[] saltBytes = new byte[8];
            random.nextBytes(saltBytes);
            setSystemPasswordSalt(Hex.encodeToString(saltBytes));
        }
        final String encrypted = AESTools.encrypt(
                systemPassword,
                configuration.getPasswordSecret().substring(0, 16),

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        }
    }


    public byte[] generateRandomSalt() {
        byte[] salt = new byte[saltLength];
        new SecureRandom().nextBytes(salt);
        return salt;
    }

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public class AESToolsTest {


    @Test
    public void testEncryptDecrypt() {
        byte[] iv = new byte[8];
        new SecureRandom().nextBytes(iv);
        final String encrypt = AESTools.encrypt("I am secret", "1234567890123456", Hex.encodeHexString(iv));
        final String decrypt = AESTools.decrypt(encrypt, "1234567890123456", Hex.encodeHexString(iv));
        Assert.assertEquals(decrypt, "I am secret");
    }

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    }


    @Override
    public Collection<Event> getEvents(DateTime start, DateTime end) {
      events.clear();
      SecureRandom random = new SecureRandom();


      Duration duration = Duration.valueOf(end.getMillis()
          - start.getMillis());


      for (int j = 0; j < 1; j++) {
        for (int i = 0; i < duration.days() + 1; i++) {
          DateTime calendar = start;
          calendar = calendar.plusDays(i).withHourOfDay(
              6 + random.nextInt(10));


          Event event = new Event();
          int id = (int) (j * duration.days() + i);
          event.setId("" + id);
          event.setTitle(title + (1 + i));
          event.setStart(calendar);
          calendar = calendar.plusHours(random.nextInt(8));
          event.setEnd(calendar);


          events.put(id, event);
        }
      }

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    public Client(ConnectionFactory connector, Iterable<PeerInfo> servers) throws IOException, ServiceException {
        this.connector = connector;


        // SecureRandom can cause delays if over-used.  Pulling 8 bytes shouldn't be a big deal.
        this.myUniqueId = new SecureRandom().nextLong();
        connectAll(Iterables.transform(servers, new Function<PeerInfo, HostPort>() {
            @Override
            public HostPort apply(PeerInfo input) {
                return new HostPort(input);
            }

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        if ( ng == null )
        {
            // FELIX-2771 Secure Random not available on Mika
            try
            {
                ng = new SecureRandom();
            }
            catch ( Throwable t )
            {
                // fall back to Random
                ng = new Random();

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          // Intentionally left blank
        }
      } };
      try {
        SSLContext context = SSLContext.getInstance("TLS");
        context.init(null, trustAllCerts, new SecureRandom());
        TRUSTED_FACTORY = context.getSocketFactory();
      } catch (GeneralSecurityException e) {
        IOException ioException = new IOException(
            "Security exception configuring SSL context");
        ioException.initCause(e);

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            options.setProxyConfig(proxyConfig);
        }


        // authorize application on user's behalf
        try {
            final String csrfId = String.valueOf(new SecureRandom().nextLong());


            OAuthWebViewData viewData = new OAuthWebViewData(boxClient.getOAuthDataController());
            viewData.setOptionalState(String.valueOf(csrfId));
            final HtmlPage authPage = webClient.getPage(viewData.buildUrl().toString());

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        try {
            keyGen = KeyPairGenerator.getInstance(algorithm);
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        }
        keyGen.initialize(keylength, new SecureRandom());
        return keyGen.generateKeyPair();
    }

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        try {
            keyGen = KeyPairGenerator.getInstance(algorithm);
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        }
        keyGen.initialize(keylength, new SecureRandom());
        return keyGen.generateKeyPair();
    }

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