数据加密DesUtil

import lombok.extern.slf4j.Slf4j;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.security.SecureRandom;

/**
 * DesUtil
 *
 * @author XiaoWeng
 * @version v1.0
 * @date 2022/12/12
 */
@Slf4j
public class DesUtil {

    private static final String DES = "DES";
    private static final Charset ENCODE = StandardCharsets.UTF_8;
    private static final String DEFAULT_KEY = "shige123";

    /**
     * 使用 默认key 加密
     */
    public static String encrypt(String data) {
        byte[] bt;
        try {
            bt = encrypt(data.getBytes(StandardCharsets.UTF_8), DEFAULT_KEY.getBytes(ENCODE));
        } catch (Exception e) {
            log.error("加密失败=====>" + data);
            return null;
        }
        return parseByte2HexStr(bt);
    }

    /**
     * 使用 默认key 解密
     */
    public static String decrypt(String data) {
        if (data == null) {
            return null;
        }
        byte[] buf;
        byte[] bt;
        try {
            buf = parseHexStr2Byte(data);
            bt = decrypt(buf, DEFAULT_KEY.getBytes(ENCODE));
        } catch (Exception e) {
            log.error("解密失败=====>" + data);
            return null;
        }
        return new String(bt, ENCODE);
    }

    /**
     * Description 根据键值进行加密
     */
    public static String encrypt(String data, String key) {
        byte[] bt;
        try {
            bt = encrypt(data.getBytes(ENCODE), key.getBytes(ENCODE));
        } catch (Exception e) {
            log.error("加密失败=====>" + data);
            return null;
        }
        return parseByte2HexStr(bt);
    }

    /**
     * Description 根据键值进行解密
     */
    public static String decrypt(String data, String key) {
        if (data == null) {
            return null;
        }
        byte[] buf;
        byte[] bt;
        try {
            buf = parseHexStr2Byte(data);
            bt = decrypt(buf, key.getBytes(ENCODE));
        } catch (Exception e) {
            log.error("解密失败=====>" + data);
            return null;
        }
        return new String(bt, ENCODE);
    }

    /**
     * Description 根据键值进行加密
     */
    private static byte[] encrypt(byte[] data, byte[] key) throws Exception {
        // 生成一个可信任的随机数源
        SecureRandom sr = new SecureRandom();

        // 从原始密钥数据创建DESKeySpec对象
        DESKeySpec dks = new DESKeySpec(key);

        // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
        SecretKey securekey = keyFactory.generateSecret(dks);

        // Cipher对象实际完成加密操作
        Cipher cipher = Cipher.getInstance(DES);

        // 用密钥初始化Cipher对象
        cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);

        return cipher.doFinal(data);
    }

    /**
     * Description 根据键值进行解密
     */
    private static byte[] decrypt(byte[] data, byte[] key) throws Exception {
        // 生成一个可信任的随机数源
        SecureRandom sr = new SecureRandom();

        // 从原始密钥数据创建DESKeySpec对象
        DESKeySpec dks = new DESKeySpec(key);

        // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
        SecretKey securekey = keyFactory.generateSecret(dks);

        // Cipher对象实际完成解密操作
        Cipher cipher = Cipher.getInstance(DES);

        // 用密钥初始化Cipher对象
        cipher.init(Cipher.DECRYPT_MODE, securekey, sr);

        return cipher.doFinal(data);
    }

    public static String parseByte2HexStr(byte[] buf) {
        StringBuilder sb = new StringBuilder();
        for (byte b : buf) {
            String hex = Integer.toHexString(b & 255);
            if (hex.length() == 1) {
                hex = '0' + hex;
            }
            sb.append(hex.toUpperCase());
        }
        return sb.toString();
    }

    public static byte[] parseHexStr2Byte(String hexStr) {
        if (hexStr.length() < 1) {
            return new byte[0];
        } else {
            byte[] result = new byte[hexStr.length() / 2];
            for (int i = 0; i < hexStr.length() / 2; ++i) {
                int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
                int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
                result[i] = (byte) (high * 16 + low);
            }
            return result;
        }
    }

    public static void main(String[] args) throws Exception {
        String test = "18513100195";
        //加密解密
        System.out.println(encrypt(test));
        System.out.println(decrypt(encrypt(test)));

    }
}