DESUtil

package com.tebon.ams.util;

import sun.misc.BASE64Decoder;

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

/**
 * @description: ${description}
 * @author: dfz
 * @create: 2019-05-16
 **/
public class DESUtil {
    /**
     * 密钥算法
     *
     * @version 1.0
     * @author
     */
    public static final String KEY_ALGORITHM = "DESede";

    /**
     * 加密/解密算法/工作模式/填充方式
     *
     * @version 1.0
     * @author
     */
    public static final String CIPHER_ALGORITHM = "DESede/ECB/PKCS5Padding";

    /**
     * 转换密钥
     *
     * @param key 二进制密钥
     * @return key 密钥
     */
    public static Key toKey(byte[] key) throws Exception {
        //实例化DES密钥材料
        DESedeKeySpec dks = new DESedeKeySpec(key);
        //实例化秘密密钥工厂
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(KEY_ALGORITHM);
        //生成秘密密钥
        return keyFactory.generateSecret(dks);
    }

    /**
     * 解密
     *
     * @param data 待解密数据
     * @param key  密钥
     * @return byte[] 解密数据
     */
    public static byte[] decrypt(byte[] data, byte[] key) throws Exception {
        //还原密钥
        Key k = toKey(key);
        /**
         * 实例化
         * 使用PKCS7Padding填充方式，按如下代码实现
         * Cipher.getInstance(CIPHER_ALGORITHM,"BC");
         */
        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
        //初始化，设置为解密模式
        cipher.init(Cipher.DECRYPT_MODE, k);
        //执行操作
        return cipher.doFinal(data);
    }

    public static byte[] encrypt(byte[] data, byte[] key) throws Exception {
        //还原密钥
        Key k = toKey(key);
        /**
         * 实例化
         * 使用PKCS7Padding填充方式，按如下代码实现
         * Cipher.getInstance(CIPHER_ALGORITHM,"BC");
         */
        Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
        //初始化，设置为解密模式
        //cipher.init(Cipher.ENCRYPT_MODE, k);
        cipher.init(Cipher.ENCRYPT_MODE, k);

        //执行操作
        return cipher.doFinal(data);
    }

    /**
     * 生成密钥
     *
     * @return byte[] 二进制密钥
     */
    public static byte[] initKey() throws Exception {
        /**
         * 实例化
         * 使用128位或192位长度密钥
         * KeyGenerator.getInstance(KEY_ALGORITHM,"BC");
         */
        KeyGenerator kg = KeyGenerator.getInstance(KEY_ALGORITHM);
        /**
         * 初始化
         *使用128位或192位长度密钥，按如下代码实现
         *kg.init(128);
         *kg.init(192);
         */
        kg.init(168);
        //生成秘密密钥
        SecretKey secretKey = kg.generateKey();
        //获得密钥的二进制编码形式
        return secretKey.getEncoded();
    }

    public static void main(String[] args) throws Exception {
        //秘钥
        byte[] key = initKey();
        //原始数据
        String data = "123456";
        System.out.println("原始数据：" + data);
        byte[] dataByte = data.getBytes("utf-8");
        //加密后编码
        byte[] valueStr = encrypt(dataByte, key);
        String value = BASE64Encoder.encode(valueStr);
        System.out.println("加密后的数据：" + value);

        //解密后解码
        //decrypt()
        byte[] v = new BASE64Decoder().decodeBuffer(value);
        byte[] vStr = decrypt(v, key);
        String decV = new String(vStr, "utf-8");
        System.out.println("解密后的数据：" + decV);

    }

    //10进制数组转换16进制数组
    public static String printbytes(String tip, byte[] b) {
        String ret = "";
        String str;
        for (int i = 0; i < b.length; i++) {

            str = Integer.toHexString((int) (b[i] & 0xff));

            if (str.length() == 1)
                str = "0" + str;
            ret = ret + str + " ";
        }

        // 02 00 07 00 00 60 70 01 17 35 03 C8
        return ret;
    }
}