Examples of java.security.SecureRandom.nextBytes()

java.security.SecureRandom.nextBytes()
Generates a user-specified number of random bytes.
If a call to setSeed had not occurred previously, the first call to this method forces this SecureRandom object to seed itself. This self-seeding will not occur if setSeed was previously called. @param bytes the array to be filled in with random bytes.

      rng = new SecureRandom();
    }
    
    // use 48 bits for strength and fill them in
    byte[] randomBytes = new byte[6];
    rng.nextBytes(randomBytes);
    
    // convert to a long
    return new BigInteger(randomBytes).longValue();
  }

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            rng = new SecureRandom();
        }


        // use 48 bits for strength and fill them in
        byte[] randomBytes = new byte[6];
        rng.nextBytes(randomBytes);


        // convert to a long
        return new BigInteger(randomBytes).longValue();
    }

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     * @return a new random salt.
     */
    private static String generateSalt() {
        SecureRandom random = new SecureRandom();
        byte salt[] = new byte[8];
        random.nextBytes(salt);


        StringBuffer res = new StringBuffer(salt.length * 2);
        for (byte b : salt) {
            res.append(Text.hexTable[(b >> 4) & 15]);
            res.append(Text.hexTable[b & 15]);

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     */
    protected byte[] generateEphemeralKey(int keySize) throws TrustException {
        try {
            SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
            byte[] temp = new byte[keySize / 8];
            random.nextBytes(temp);
            return temp;
        } catch (Exception e) {
            throw new TrustException("Error in creating the ephemeral key", e);
        }
    }

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                                          String algo,
                                          int keySize) throws TrustException {
        try {
            SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
            byte[] temp = new byte[keySize / 8];
            random.nextBytes(temp);
            return temp;
        } catch (Exception e) {
            throw new TrustException("Error in creating the ephemeral key", e);
        }
    }

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     */
    protected byte[] generateEphemeralKey(int keySize) throws TrustException {
        try {
            SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
            byte[] temp = new byte[keySize / 8];
            random.nextBytes(temp);
            return temp;
        } catch (Exception e) {
            throw new TrustException("Error in creating the ephemeral key", e);
        }
    }

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 */
public class SecretTest extends TestCase {
    @Override protected void setUp() throws Exception {
        SecureRandom sr = new SecureRandom();
        byte[] random = new byte[32];
        sr.nextBytes(random);
        Secret.SECRET = Util.toHexString(random);


    }


    @Override protected void tearDown() throws Exception {

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            if(secretFile.exists()) {
                secretKey = secretFile.readTrim();
            } else {
                SecureRandom sr = new SecureRandom();
                byte[] random = new byte[32];
                sr.nextBytes(random);
                secretKey = Util.toHexString(random);
                secretFile.write(secretKey);
            }


            try {

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            // Seed specified, so use it
            byte[] seedBytes = FileCopyUtils.copyToByteArray(seed.getInputStream());
            rnd.setSeed(seedBytes);
        } else {
            // Request the next bytes, thus eagerly incurring the expense of default seeding
            rnd.nextBytes(new byte[1]);
        }


        return rnd;
    }

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         */
        public static GUID newGuid() {
            SecureRandom ng = new SecureRandom();
            byte[] randomBytes = new byte[16];


            ng.nextBytes(randomBytes);
            randomBytes[6] &= 0x0f;
            randomBytes[6] |= 0x40;
            randomBytes[8] &= 0x3f;
            randomBytes[8] |= 0x80;

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