加解密---对称加密算法

1、概述：

　　　　1.1　　加密秘钥=解密秘钥

　　　　1.2　　属于初等加密算法

2、对称加密算法：

　　　　1.1　　DES（3DES）

　　　　　　　　Data Encryption Standard   数据加密标准

package com.exiuge.mytest;


import org.bouncycastle.util.encoders.Hex;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import java.security.Key;

public class JdkDES {

    private static String src="hello,rose";

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

    public static void enDeCode(String src){
        try {
            //生成key
            KeyGenerator keyGenerator=KeyGenerator.getInstance("DES");
            keyGenerator.init(56);
            SecretKey secretKey =keyGenerator.generateKey();
            byte[] bytesKey=secretKey.getEncoded();

            //key转换
            DESKeySpec desKeySpec=new DESKeySpec(bytesKey);
            SecretKeyFactory secretKeyFactory=SecretKeyFactory.getInstance("DES");
            Key convertKey =secretKeyFactory.generateSecret(desKeySpec);

            //加密
            Cipher cipher=Cipher.getInstance("DES/ECB/PKCS5padding");
            cipher.init(Cipher.ENCRYPT_MODE,convertKey);
            byte[] desBytes=cipher.doFinal(src.getBytes());
            System.out.println(Hex.toHexString(desBytes));
            System.out.println(new String(desBytes,"utf-8"));

            //解密
            cipher.init(Cipher.DECRYPT_MODE,convertKey);
            byte[] srcBytes=cipher.doFinal(desBytes);
            System.out.println(new String(srcBytes));
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}

package com.exiuge.mytest;

import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.util.encoders.Hex;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import java.security.Key;
import java.security.Security;

public class BCDES {

    private static String src="hello,rose";

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

    public static void enDeCode(String src){
        try {
            Security.addProvider(new BouncyCastleProvider());
            //生成key
            KeyGenerator keyGenerator=KeyGenerator.getInstance("DES","BC");
            keyGenerator.init(56);
            SecretKey secretKey =keyGenerator.generateKey();
            byte[] bytesKey=secretKey.getEncoded();

            //key转换
            DESKeySpec desKeySpec=new DESKeySpec(bytesKey);
            SecretKeyFactory secretKeyFactory=SecretKeyFactory.getInstance("DES");
            Key convertKey =secretKeyFactory.generateSecret(desKeySpec);

            //加密
            Cipher cipher=Cipher.getInstance("DES/ECB/PKCS5padding");
            cipher.init(Cipher.ENCRYPT_MODE,convertKey);
            byte[] desBytes=cipher.doFinal(src.getBytes());
            System.out.println(Hex.toHexString(desBytes));
            System.out.println(new String(desBytes,"utf-8"));

            //解密
            cipher.init(Cipher.DECRYPT_MODE,convertKey);
            byte[] srcBytes=cipher.doFinal(desBytes);
            System.out.println(new String(srcBytes));
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}

　　　　1.2　　AES

　　　　1.3　　PBE

　　　　1.4　　IDEA