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.

     */
    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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        SecureRandom ng=numberGenerator;
        if(ng == null)
            numberGenerator=ng=new SecureRandom();


        byte[] randomBytes=new byte[16];
        ng.nextBytes(randomBytes);
        return randomBytes;
    }




}

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   * @param length 返回字符串长度,必须为双数.
   */
  public static String randomHexString(int length) {
    SecureRandom nonceGenerator = new SecureRandom();
    byte[] nonce = new byte[length / 2];
    nonceGenerator.nextBytes(nonce);
    return Hex.encodeHexString(nonce);
  }


  /**
   * 使用SecureRandom生成Integer.

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      try
      {
         SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
         random.setSeed(System.currentTimeMillis());
         byte bytes[] = new byte[32];
         random.nextBytes(bytes);
         BASE64Encoder encoder = new BASE64Encoder();
         return encoder.encode(bytes);
      }
      catch (NoSuchAlgorithmException e)
      {

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        byte[] securedata = null;
        try {
            // Generate IV
            SecureRandom rand = new SecureRandom();
            byte[] iv = new byte[16];
            rand.nextBytes(iv);
            IvParameterSpec ivspec = new IvParameterSpec(iv);
            Cipher encryptCipher = Cipher.getInstance(CIPHER_CODE);
            encryptCipher.init(Cipher.ENCRYPT_MODE, sk, ivspec);
            encryptMac.update(iv);
            // encrypt the plaintext

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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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            // (bug 5483) generate a session key that the user must submit on every request to prevent CSRF, add that
            // to the login response so that session-based authenticators know to send the key back
            SecureRandom sesssionKeyRandom = new SecureRandom();
            byte sessionKeyBytes[] = new byte[20];
            sesssionKeyRandom.nextBytes(sessionKeyBytes);
            String sessionKey = Base64.encodeBase64String(sessionKeyBytes);
            session.setAttribute("sessionkey", sessionKey);


            return;
        }

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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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