Java对称加密算法DES实例详解

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

PS：关于加密解密感兴趣的朋友还可以参考本站在线工具：

文字在线加密解密工具（包含AES、DES、RC4等）：
http://tools.jb51.net/password/txt_encode

MD5在线加密工具:
http://tools.jb51.net/password/CreateMD5Password

在线散列/哈希算法加密工具:
http://tools.jb51.net/password/hash_encrypt

在线MD5/hash/SHA-1/SHA-2/SHA-256/SHA-512/SHA-3/RIPEMD-160加密工具：
http://tools.jb51.net/password/hash_md5_sha

在线sha1/sha224/sha256/sha384/sha512加密工具：
http://tools.jb51.net/password/sha_encode

更多关于java相关内容感兴趣的读者可查看本站专题：《Java数学运算技巧总结》、《Java数据结构与算法教程》、《Java字符与字符串操作技巧总结》、《Java操作DOM节点技巧总结》和《Java缓存操作技巧汇总》

希望本文所述对大家java程序设计有所帮助。