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.

            {


                // Hm, we have no IV but we want to wrap ?!?
                // well, then we have to create our own IV.
                this.iv = new byte[8];
                sr.nextBytes(iv);


                this.paramPlusIV = new ParametersWithIV(this.param, this.iv);
            }
        }
        else if (param instanceof ParametersWithIV)

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     * @return The cnonce value as String.
     */
    public static String createCnonce() {
        SecureRandom rnd = new SecureRandom();
        byte[] tmp = new byte[8];
        rnd.nextBytes(tmp);
        return encode(tmp);
    }


}

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        {
          
          // Write IV as a prefix:
          SecureRandom random = new SecureRandom();
          byte[] iv = new byte[IV_LENGTH];
          random.nextBytes(iv);
          os.write(iv);
          os.flush();
          
          Cipher cipher = null; 
          try

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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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        byte secret[] = null; 
        writer.writeStartElement(prefix, "RequestedProofToken", namespace);
        if (clientEntropy == null) {
            SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
            secret = new byte[keySize / 8];
            random.nextBytes(secret);
            
            writer.writeStartElement(prefix, "BinarySecret", namespace);
            writer.writeAttribute("Type", namespace + "/Nonce");
            writer.writeCharacters(Base64.encode(secret));
            writer.writeEndElement();

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        int numIter = (len / 40) + 1;


        StringBuilder outBuffer = new StringBuilder();
        for (int iter = 1; iter < numIter + 1; iter++) {
            byte[] randomBytes = new byte[40];
            secRan.nextBytes(randomBytes);
            alg.update(randomBytes);


            // Compute hash -- will create 20-byte binary hash
            byte[] hash = alg.digest();

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        md.update(userId.getBytes());


        // add some random data to the message to make it unique
        SecureRandom sr = new SecureRandom();
        byte[] buffer = new byte[128];
        sr.nextBytes(buffer);
        md.update(buffer);


        byte[] res = md.digest();
        return new String(Base64.encode(res));
    }

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    @Nonnull
    private static String generateKey(int size) {
        SecureRandom random = new SecureRandom();
        byte key[] = new byte[size];
        random.nextBytes(key);


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

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            }
        } else {
            SecureRandom random = new SecureRandom();
            random.setSeed(System.currentTimeMillis());
            byte[] bytes = new byte[16];
            random.nextBytes(bytes);
            spec = new SecretKeySpec(bytes, "AES");
            File dir = location.getParentFile();
            if (!dir.exists()) {
                dir.mkdirs();
            }

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        {
          
          // Write IV as a prefix:
          SecureRandom random = new SecureRandom();
          byte[] iv = new byte[IV_LENGTH];
          random.nextBytes(iv);
          os.write(iv);
          os.flush();
          
          Cipher cipher = null; 
          try

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