Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Apache License 

import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

public class Main {
    public static String generateNonce() {
        try {
            // Create a secure random number generator
            SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");

            // Get 1024 random bits
            byte[] bytes = new byte[1024 / 8];
            sr.nextBytes(bytes);

            // Create two secure number generators with the same seed
            int seedByteCount = 10;
            byte[] seed = sr.generateSeed(seedByteCount);

            sr = SecureRandom.getInstance("SHA1PRNG");
            sr.setSeed(seed);
            SecureRandom sr2 = SecureRandom.getInstance("SHA1PRNG");
            sr2.setSeed(seed);

            String nonce = Long.toHexString(sr2.nextLong());
            nonce = nonce.substring(0, 7);

            return nonce;

        } catch (NoSuchAlgorithmException e) {
        }
        return null;
    }
}