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.

                SecureRandom rnd = new SecureRandom();
                Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");


                // make a random 256-bit file encryption key
                encryptionKey = new byte[32];
                rnd.nextBytes(encryptionKey);
                
                // Algorithm 8a: Compute U
                byte[] userPasswordBytes = truncate127(userPassword.getBytes("UTF-8"));
                byte[] userValidationSalt = new byte[8];
                byte[] userKeySalt = new byte[8];

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                // Algorithm 8a: Compute U
                byte[] userPasswordBytes = truncate127(userPassword.getBytes("UTF-8"));
                byte[] userValidationSalt = new byte[8];
                byte[] userKeySalt = new byte[8];
                rnd.nextBytes(userValidationSalt);
                rnd.nextBytes(userKeySalt);
                byte[] hashU = computeHash2B(concat(userPasswordBytes, userValidationSalt),
                        userPasswordBytes, null);
                byte[] u = concat(hashU, userValidationSalt, userKeySalt);

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                // Algorithm 8a: Compute U
                byte[] userPasswordBytes = truncate127(userPassword.getBytes("UTF-8"));
                byte[] userValidationSalt = new byte[8];
                byte[] userKeySalt = new byte[8];
                rnd.nextBytes(userValidationSalt);
                rnd.nextBytes(userKeySalt);
                byte[] hashU = computeHash2B(concat(userPasswordBytes, userValidationSalt),
                        userPasswordBytes, null);
                byte[] u = concat(hashU, userValidationSalt, userKeySalt);
                
                // Algorithm 8b: Compute UE

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                // Algorithm 9a: Compute O
                byte[] ownerPasswordBytes = truncate127(ownerPassword.getBytes("UTF-8"));
                byte[] ownerValidationSalt = new byte[8];
                byte[] ownerKeySalt = new byte[8];
                rnd.nextBytes(ownerValidationSalt);
                rnd.nextBytes(ownerKeySalt);
                byte[] hashO = computeHash2B(concat(ownerPasswordBytes, ownerValidationSalt, u),
                        ownerPasswordBytes, u);
                byte[] o = concat(hashO, ownerValidationSalt, ownerKeySalt);

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                // Algorithm 9a: Compute O
                byte[] ownerPasswordBytes = truncate127(ownerPassword.getBytes("UTF-8"));
                byte[] ownerValidationSalt = new byte[8];
                byte[] ownerKeySalt = new byte[8];
                rnd.nextBytes(ownerValidationSalt);
                rnd.nextBytes(ownerKeySalt);
                byte[] hashO = computeHash2B(concat(ownerPasswordBytes, ownerValidationSalt, u),
                        ownerPasswordBytes, u);
                byte[] o = concat(hashO, ownerValidationSalt, ownerKeySalt);
                
                // Algorithm 9b: Compute OE

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            {


                // 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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        this.hashLength = digest.getDigestLength();


        // Create a new secret only valid within this NonceManager instance.
        Random rand = new SecureRandom();
        byte[] secretBytes = new byte[32];
        rand.nextBytes(secretBytes);
        secret = FlexBase64.encodeString(digest.digest(secretBytes), false);
    }


    private MessageDigest getDigest(final String hashAlg) {
        try {

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            if ((opmode == Cipher.ENCRYPT_MODE) || (opmode == Cipher.WRAP_MODE))
            {
                byte[]  iv = new byte[ivLength];


                ivRandom.nextBytes(iv);
                param = new ParametersWithIV(param, iv);
                ivParam = (ParametersWithIV)param;
            }
            else if (cipher.getUnderlyingCipher().getAlgorithmName().indexOf("PGPCFB") < 0)
            {

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            if ((opmode == Cipher.ENCRYPT_MODE) || (opmode == Cipher.WRAP_MODE))
            {
                byte[]  iv = new byte[ivLength];


                ivRandom.nextBytes(iv);
                param = new ParametersWithIV(param, iv);
                ivParam = (ParametersWithIV)param;
            }
            else
            {

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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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