前端DES加密、base64编码,后端DES解密、base64解码

项目场景:

在系统开发的过程中有的时候,我们为了数据的安全性会把前端的数据进行加密,然后再在后端程序中对加密数据进行解密或解密,今天我们就在这里说2种简单的方法(DES加密、base64编码)


具体实现方案:

我们在前端页面进行加密的时候需要用到 JavaScript加密库CryptoJS v3.1.2 下载链接

页面代码:

1、DES加密

<script th:src="@{/lib/CryptoJS v3.1.2/rollups/tripledes.js}" charset="utf-8"></script>
<script th:src="@{/lib/CryptoJS v3.1.2/components/mode-ecb.js}" charset="utf-8"></script>
<script type="text/javascript">
    /**
     * @Title des加密
     * @Author YangWanJie
     * @Date 2020/12/10 16:36
     * message  加密文本内容
     * key      加密的盐
     * @versioin V1.0
     **/
    $.fn.encryptByDES = function (message, key) {
        var keyHex = CryptoJS.enc.Utf8.parse(key);
        var encrypted = CryptoJS.DES.encrypt(message, keyHex, {
            mode: CryptoJS.mode.ECB,
            padding: CryptoJS.pad.Pkcs7
        });
        return encrypted.toString();
    };
</script>

java后端解密:

import java.io.IOException;
import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

/**
 * @Title DES加密 解密算法
 * @Author YangWanJie
 * @Date 2020/5/21 17:02
 * @versioin V1.0
 **/
public class DesUtils {

    private final static String DES = "DES";//方式
    private final static String ENCODE = "UTF-8";//编码
    private final static String defaultKey = "admin";//秘钥


    /**
     * @Title 使用 默认key 加密
     * @Author YangWanJie
     * @Date 2020/5/21 17:02
     * @versioin V1.0
     **/
    public static String encrypt(String data) throws Exception {
        byte[] bt = encrypt(data.getBytes(ENCODE), defaultKey.getBytes(ENCODE));
        String strs = new BASE64Encoder().encode(bt);
        return strs;
    }

    /**
     * @Title 使用 默认key 解密
     * @Author YangWanJie
     * @Date 2020/5/21 17:02
     * @versioin V1.0
     **/
    public static String decrypt(String data) throws IOException, Exception {
        if (data == null) {
            return null;
        }
        BASE64Decoder decoder = new BASE64Decoder();
        byte[] buf = decoder.decodeBuffer(data);
        byte[] bt = decrypt(buf, defaultKey.getBytes(ENCODE));
        return new String(bt, ENCODE);
    }

    /**
     * @Title 根据键值进行加密
     * @Author YangWanJie
     * @Date 2020/5/21 17:03
     * @versioin V1.0
     **/
    public static String encrypt(String data, String key) throws Exception {
        byte[] bt = encrypt(data.getBytes(ENCODE), key.getBytes(ENCODE));
        String strs = new BASE64Encoder().encode(bt);
        return strs;
    }

    /**
     * @Title 根据键值进行解密
     * @Author YangWanJie
     * @Date 2020/5/21 17:03
     * @versioin V1.0
     **/
    public static String decrypt(String data, String key) throws IOException,
            Exception {
        if (data == null) {
            return null;
        }
        BASE64Decoder decoder = new BASE64Decoder();
        byte[] buf = decoder.decodeBuffer(data);
        byte[] bt = decrypt(buf, key.getBytes(ENCODE));
        return new String(bt, ENCODE);
    }

    /**
     * @Title 根据键值进行加密
     * @Author YangWanJie
     * @Date 2020/5/21 17:04
     * @versioin V1.0
     **/
    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);
    }

    /**
     * @Title 根据键值进行解密
     * @Author YangWanJie
     * @Date 2020/5/21 17:04
     * @versioin V1.0
     **/
    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);
    }
}

 2、前端base64编码

$.base64.encode('要被编码的文本内容');

  Java后端解码 

import org.apache.commons.codec.binary.Base64;

/**
 * @Title base64 编码与解码
 * @Author YangWanJie
 * @Date 2020/6/24 19:38
 * @versioin V1.0
 **/
public class Base64Code {

    /**
     * @Title base64 编码
     * @Author YangWanJie
     * @Date 2020/6/24 19:37
     * @versioin V1.0
     **/
    public static String encode(byte[] bytes) {
        return new String(Base64.encodeBase64(bytes));
    }

    /**
     * @Title base64 解码
     * @Author YangWanJie
     * @Date 2020/6/24 19:37
     * @versioin V1.0
     **/
    public static String decode(byte[] bytes) {
        return new String(Base64.decodeBase64(bytes));
    }
}

 


通过以上2中方法都可以实现数据的前端加密,后端解密

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