消息摘要算法

package com.kaishengit.security;

import java.security.MessageDigest;
import java.security.Security;

import javax.crypto.KeyGenerator;
import javax.crypto.Mac;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Hex;
import org.apache.commons.codec.digest.DigestUtils;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.digests.SHA1Digest;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

/**
 * 消息摘要算法
 * @author kdj
 * 创建时间:2018年4月11日
 */
public class MessageDigestTest {

    
    private static String securityStr = "测试";
    
    public static void main(String[] args) {
        
        //包含三种：MD5，SHA，MAC
        //消息摘要算法是数字签名的核心算法
//        MD5Encode();
//        MD4Encode();
//        MD5ccEncode();
        
//        SHAJdkEncode();
//        SHABCEncode();
//        SHACCEncode();
        
        MACJdkEncode();
    }
    
    
    //MD是128位摘要信息，MD2（JDK），MD4（bouncy），MD5(JDK)
    //单向加密算法
    public static String MD5Encode(){
        try {
            MessageDigest dig = MessageDigest.getInstance("MD5");
            byte[] encode = dig.digest(securityStr.getBytes());
            String encodeStr = Hex.encodeHexString(encode);
            System.out.println("md5 jdk encode:"+encodeStr);
            return encodeStr;
        } catch (Exception e) {
        }
        return "";
    }
    
    /**
     * 因为md4在jdk中没有实现，所有可以往安全类中加入bouncy，使jdk也可以使用MD4
     * @return
     */
    public static String MD4Encode(){
        try {
            Security.addProvider(new BouncyCastleProvider());
            MessageDigest dig = MessageDigest.getInstance("MD4");
            byte[] encode = dig.digest(securityStr.getBytes());
            String encodeStr = Hex.encodeHexString(encode);
            System.out.println("md4 encode:"+encodeStr);
            return encodeStr;
        } catch (Exception e) {
        }
        return "";
    }
    
    /**
     * 简化了调用的复杂性，利用common
     * @return
     */
    public static String MD5ccEncode(){
        //调用的是
        System.out.println("md5 cc encode:"+DigestUtils.md5Hex(securityStr.getBytes()));
        return "";
    }
    //-----------------------------------------------------------------------------
    //SHA安全散列
    
    public static String SHAJdkEncode(){
        try {
            MessageDigest dig = MessageDigest.getInstance("SHA");
            byte[] arr = dig.digest(securityStr.getBytes());
            //转换16进制为字符串
            String encode = Hex.encodeHexString(arr);
            System.out.println("SHA JDK Encode:"+encode);
            return encode;
        } catch (Exception e) {
        }
        return "";
    }
    
    public static String SHABCEncode(){
        try {
            Digest digest = new SHA1Digest();
            digest.update(securityStr.getBytes(), 0, securityStr.getBytes().length);
            byte[] sha1Byte = new byte[digest.getDigestSize()];
            digest.doFinal(sha1Byte, 0);
            String shaStr = org.bouncycastle.util.encoders.Hex.toHexString(sha1Byte);
            System.out.println("SHA BC Encode:"+shaStr);
            return shaStr;
        } catch (Exception e) {
        }
        return "";
    }
    
    public static String SHACCEncode(){
        byte[] arr = DigestUtils.sha1(securityStr.getBytes());
        String encode = Hex.encodeHexString(arr);
        System.out.println("SHA CC Encode:"+encode);
        return encode;
    }
    
    
    //----------------------------------------------------------------------------
    //MAC
    
    public static String MACJdkEncode(){
        try {
            KeyGenerator keyGenerator = KeyGenerator.getInstance("HmacMD5");
            //产生秘钥
            SecretKey secretKey = keyGenerator.generateKey();
            //获取秘钥
            byte[] key = secretKey.getEncoded();

            
            //还原秘钥
            SecretKey restSecretKey = new SecretKeySpec(key, "HmacMD5");
            //实例化MAC
            Mac mac = Mac.getInstance(restSecretKey.getAlgorithm());
            mac.init(restSecretKey);
            byte[] hmacMD5Byte = mac.doFinal(securityStr.getBytes());
            String encode = Hex.encodeHexString(hmacMD5Byte);
            System.out.println("MAC JDK Encode:"+encode);
            return encode;
        } catch (Exception e) {
        }
        return "";
    }
    
    public static String MACCCEncode(){
        return "";
    }
    
    
    
}