Java对称加密算法DES实例详解

2019-11-26 08:36:10

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本文实例讲述了Java对称加密算法DES。分享给大家供大家参考，具体如下：

一 DES算法概述

1、介绍

DES：Data Encryption Standard 数据加密标准。

2、DES算法参数

二 DES算法Java实现

package com.imooc.security.des;import java.security.Key;import java.security.Security;import javax.crypto.Cipher;import javax.crypto.KeyGenerator;import javax.crypto.SecretKey;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.DESKeySpec;import org.apache.commons.codec.binary.Hex;import org.bouncycastle.jce.provider.BouncyCastleProvider;public class ImoocDES {    private static String src = "cakin24 security des";    public static void main(String[] args) {        jdkDES();        bcDES();    }    public static void jdkDES() {        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 factory = SecretKeyFactory.getInstance("DES");            Key convertSecretKey = factory.generateSecret(desKeySpec);            //加密            Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");            cipher.init(Cipher.ENCRYPT_MODE, convertSecretKey);            byte[] result = cipher.doFinal(src.getBytes());            System.out.println("jdk des encrypt : " + Hex.encodeHexString(result));            //解密            cipher.init(Cipher.DECRYPT_MODE, convertSecretKey);            result = cipher.doFinal(result);            System.out.println("jdk des decrypt : " + new String(result));        } catch (Exception e) {            e.printStackTrace();        }    }    public static void bcDES() {        try {            Security.addProvider(new BouncyCastleProvider());            //生成KEY            KeyGenerator keyGenerator = KeyGenerator.getInstance("DES", "BC");            keyGenerator.getProvider();            keyGenerator.init(56);            SecretKey secretKey = keyGenerator.generateKey();            byte[] bytesKey = secretKey.getEncoded();            //KEY转换            DESKeySpec desKeySpec = new DESKeySpec(bytesKey);            SecretKeyFactory factory = SecretKeyFactory.getInstance("DES");            Key convertSecretKey = factory.generateSecret(desKeySpec);            //加密            Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");            cipher.init(Cipher.ENCRYPT_MODE, convertSecretKey);            byte[] result = cipher.doFinal(src.getBytes());            System.out.println("bc des encrypt : " + Hex.encodeHexString(result));            //解密            cipher.init(Cipher.DECRYPT_MODE, convertSecretKey);            result = cipher.doFinal(result);            System.out.println("bc des decrypt : " + new String(result));        } catch (Exception e) {            e.printStackTrace();        }    }}

三实现效果

jdk des encrypt : fce3e47941952379b860ca6dd00e0632b45e1edd02d4d843
jdk des decrypt : cakin24 security des
bc des encrypt : 13a41ff56157a7bb40b5ef77eca83bba9a444d1b5c89de11
bc des decrypt : cakin24 security des

四 DES算法应用场景