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.

            }
        } 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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            WSSecSecurityContextToken sctBuilder = new WSSecSecurityContextToken();
            sctBuilder.prepare(doc, crypto);


            SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
            byte[] tempSecret = new byte[16];
            random.nextBytes(tempSecret);


            // Store the secret
            this.secrets.put(sctBuilder.getIdentifier(), tempSecret);


            String tokenId = sctBuilder.getSctId();

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            WSSecSecurityContextToken sctBuilder = new WSSecSecurityContextToken();
            sctBuilder.prepare(doc, crypto);


            SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
            byte[] tempSecret = new byte[16];
            random.nextBytes(tempSecret);


            // Store the secret
            this.secrets.put(sctBuilder.getIdentifier(), tempSecret);


            String tokenId = sctBuilder.getSctId();

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            WSSecSecurityContextToken sctBuilder = new WSSecSecurityContextToken();
            sctBuilder.prepare(doc, crypto);


            SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
            byte[] tempSecret = new byte[16];
            random.nextBytes(tempSecret);


            // Store the secret
            this.secrets.put(sctBuilder.getIdentifier(), tempSecret);


            String tokenId = sctBuilder.getSctId();

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            WSSecSecurityContextToken sctBuilder = new WSSecSecurityContextToken();
            sctBuilder.prepare(doc, crypto);


            SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
            byte[] tempSecret = new byte[16];
            random.nextBytes(tempSecret);


            // Store the secret
            this.secrets.put(sctBuilder.getIdentifier(), tempSecret);


            String tokenId = sctBuilder.getSctId();

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        throws NoSuchAlgorithmException, InvalidKeySpecException
    {
        // Generate a random salt
        SecureRandom random = new SecureRandom();
        byte[] salt = new byte[SALT_BYTE_SIZE];
        random.nextBytes(salt);


        // Hash the password
        byte[] hash = pbkdf2(password, salt, PBKDF2_ITERATIONS, HASH_BYTE_SIZE);
        // format iterations:salt:hash
        return PBKDF2_ITERATIONS + ":" + toHex(salt) + ":" +  toHex(hash);

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        throws NoSuchAlgorithmException, InvalidKeySpecException
    {
        // Generate a random salt
        SecureRandom random = new SecureRandom();
        byte[] salt = new byte[SALT_BYTE_SIZE];
        random.nextBytes(salt);


        // Hash the password
        byte[] hash = pbkdf2(password, salt, PBKDF2_ITERATIONS, HASH_BYTE_SIZE);
        // format iterations:salt:hash
        return "sha1:" + PBKDF2_ITERATIONS + ":" + toBase64(salt) + ":" +  toBase64(hash);

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            len = 1;
        }
        byte[] buff = new byte[len];
        SecureRandom sr = getSecureRandom();
        synchronized (sr) {
            sr.nextBytes(buff);
        }
        return buff;
    }


    /**

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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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