加解密---消息摘要算法

Posted 2021-02-10 anpeiyong

1、概述

　　　　消息摘要算法特征：加密过程不需要秘钥、加密后的数据无法被解密

2、消息摘要算法

　　　　1.1　　MD（Message Digest）

　　　　　　　　MD家族（128位摘要信息）

　　　　　　　　

package com.exiuge.mytest;

import org.apache.commons.codec.binary.Hex;
import java.security.MessageDigest;

public class JdkMD5 {

    private static String src="hello,rose";

    public static void main(String[] args){
        enDeCode(src);
    }

    public static void enDeCode(String src){
        try {
            MessageDigest messageDigest=MessageDigest.getInstance("MD5");
            byte[] desBytes=messageDigest.digest(src.getBytes());
            System.out.println(Hex.encodeHexString(desBytes));
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}

package com.exiuge.mytest;

import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.digests.MD4Digest;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.util.encoders.Hex;
import java.security.MessageDigest;
import java.security.Security;

public class BouncyCastleMD4 {
    private static String src="hello,rose";

    public static void main(String[] args){
        enDeCode(src);
    }

    public static void enDeCode(String src){
        try {
            //第一种方式
            Digest digest =new MD4Digest();
            digest.update(src.getBytes(),0,src.getBytes().length);
            byte[] md4Bytes=new byte[digest.getDigestSize()];
            digest.doFinal(md4Bytes,0);
            System.out.println(Hex.toHexString(md4Bytes));

            //第二种方式
            Security.addProvider(new BouncyCastleProvider());
            MessageDigest messageDigest=MessageDigest.getInstance("MD4");
            byte[] md44Bytes=messageDigest.digest(src.getBytes());
            System.out.println(Hex.toHexString(md44Bytes));
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}

package com.exiuge.mytest;

import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.digests.MD5Digest;
import org.bouncycastle.util.encoders.Hex;

public class BouncyCastleMD5 {
    private static String src="hello,rose";

    public static void main(String[] args){
        enDeCode(src);
    }

    public static void enDeCode(String src){
        try {
            Digest digest =new MD5Digest();
            digest.update(src.getBytes(),0,src.getBytes().length);
            byte[] md5Bytes=new byte[digest.getDigestSize()];
            digest.doFinal(md5Bytes,0);
            System.out.println(Hex.toHexString(md5Bytes));
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}

 

　　　　1.2　　SHA(Secure Hash Algorithm)

　　　　1.3　　MAC(Message Authentication Code)