org.jhub1.agent.randoms.Randoms.java Source code

Introduction

Here is the source code for org.jhub1.agent.randoms.Randoms.java

Source

/**
 * $Revision$
 * $Date$
 * 
 * Copyright 2013 SoftCognito.org.
 *
 * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jhub1.agent.randoms;

import java.io.UnsupportedEncodingException;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Random;

import org.apache.commons.codec.binary.Hex;

public class Randoms {

    private static Randoms instance;
    private static SecureRandom random;
    private static char[] chars = "abcdefghijklmnopqrstuvwxyzQWERTYUIOPLKJHGFDSAZXCVBNM".toCharArray();
    private static Random simpleRandom = new Random();

    private static final int RESOURCEID_LENGTH = 10;

    private Randoms() {
        random = new SecureRandom();
    }

    public String generateSampleName(int length) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            char c = chars[simpleRandom.nextInt(chars.length)];
            sb.append(c);
        }
        return sb.toString();
    }

    public String generateResourceID() {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < RESOURCEID_LENGTH; i++) {
            char c = chars[simpleRandom.nextInt(chars.length)];
            sb.append(c);
        }
        return sb.toString();
    }

    public String generateSampleValue() {
        return new BigInteger(5, random).toString();
    }

    public String generateAlphanumericString(int bits) {
        return new BigInteger(bits, random).toString(32);
    }

    public static Randoms getInstance() {
        if (null == instance) {
            instance = new Randoms();
        }
        return instance;
    }

    public String generateStrongHash(String str) {
        StringBuilder sb = new StringBuilder();
        sb.append(str).append(generateSampleName(20));
        return sha1(sb.toString());
    }

    public String sha1(String str) {
        MessageDigest cript = null;
        try {
            cript = MessageDigest.getInstance("SHA-1");
        } catch (NoSuchAlgorithmException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
        cript.reset();
        try {
            cript.update(str.getBytes("utf8"));
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return new String(Hex.encodeHex(cript.digest()));
    }
}