DES对称加密实现_JAVA

 

import com.alibaba.fastjson.JSONObject;
import org.apache.commons.codec.binary.Base64;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import java.security.SecureRandom;
import java.util.HashMap;
import java.util.Map;

/**
 * description:
 */

public class DESCUtils {
    private static final String key = "DES";

    /**
     * @param data
     * @param password
     * @param encryptOrDecryptMode Cipher.ENCRYPT_MODE   Cipher.DECRYPT_MODE
     * @return
     * @throws Exception
     */
    public static byte[] encryptOrDecrypt(byte[] data, String password, int encryptOrDecryptMode) throws Exception {
        SecureRandom secureRandom = new SecureRandom();
        DESKeySpec desKeySpec = new DESKeySpec(password.getBytes());
        SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance(key);  //**工厂
        SecretKey secretKey = secretKeyFactory.generateSecret(desKeySpec);  //生成**
        Cipher cipher = Cipher.getInstance(key);
        cipher.init(encryptOrDecryptMode, secretKey, secureRandom);
        return cipher.doFinal(data);
    }

    public static String encode(String data, String password) throws Exception {
        return Base64.encodeBase64String(encryptOrDecrypt(data.getBytes("UTF-8"), password, Cipher.ENCRYPT_MODE));
    }

    public static String decode(String data, String password) throws Exception {
        return new String(encryptOrDecrypt(Base64.decodeBase64(data), password, Cipher.DECRYPT_MODE), "UTF-8");
    }

    public static void main(String[] args) {
        String password = "hjkg&t*jf/";
        Map<String, Object> map = new HashMap<>();
        map.put("user", "jack");
        String s = JSONObject.toJSONString(map);
        System.out.println(s);
        try {
            String encode = encode(s, password);
            System.out.println("encode: " + encode);
            String decode = decode(encode, password);
            System.out.println("decode: " + decode);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

 

运行结果：

{"user":"jack"}
encode: CBEUKiVQKk0fiV7EWEsfVQ==
decode: {"user":"jack"}