Java加密以及JS解密

1. Java 加解密

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

/**
 * @author xiaoyuge
 */
public class DesUtil {
    //算法
    private static final String ALGORITHM = "Des";
    //偏移量
    private static final String CIPHER_ALGORITHM = "Des/ECB/PKCS5Padding";
    //默认编码
    private static final String CHARSET = "utf-8";

    private static SecretKey generateKey(String password) throws Exception {
        DESKeySpec dks = new DESKeySpec(password.getBytes(CHARSET));
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);
        return keyFactory.generateSecret(dks);
    }

    /**
     * byte数组转化为16进制字符串
     * @param bytes
     * @return
     */
    public static String byte2HexString(byte[] bytes) {
        StringBuilder hex = new StringBuilder();
        if (bytes != null) {
            for (Byte b : bytes) {
                hex.append(String.format("%02x", b.intValue() & 0XFF));
            }
        }
        return hex.toString();
    }

    /**
     * 16进制转化为byte数组
     * @param s
     * @return
     */
    public static byte[] hexStringToByteArray(String s) {
        int len = s.length();
        byte[] data = new byte[len / 2];
        try {
            for (int i = 0; i < len; i += 2) {
                data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4)
                        + Character.digit(s.charAt(i + 1), 16));
            }
        } catch (Exception exception) {
            exception.printStackTrace();
        }
        return data;
    }

    /**
     * 加密字符串
     */
    public static String encrypt(String password, String data) {
        if (password == null || password.length() < 8) {
            throw new RuntimeException("加密失败，key不能小于8位");
        }
        if (data == null) {
            return null;
        }
        try {
            Key secretKey = generateKey(password);
            Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
            cipher.init(Cipher.ENCRYPT_MODE, secretKey);
            byte[] bytes = cipher.doFinal(data.getBytes(CHARSET));
            return byte2HexString(bytes);
        } catch (Exception ex) {
            ex.printStackTrace();
            return null;
        }
    }

    /**
     * 解密
     */
    public static String decrypt(String password, String data) {
        if (password == null || password.length() < 8) {
            throw new RuntimeException("解密失败，key不能小于8位");
        }
        if (data == null) {
            return null;
        }
        try {
            Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
            Key secretKey = generateKey(password);
            cipher.init(Cipher.DECRYPT_MODE, secretKey);
            byte[] bytes = hexStringToByteArray(data);
            return new String(cipher.doFinal(bytes), CHARSET);
        } catch (Exception ex) {
            ex.printStackTrace();
            return null;
        }
    }

    public static void main(String[] args) {
        String str = "xiaoyuge";
        String password = "secret_key";
        String encrypt = encrypt(password, str);
        System.out.println("加密结果："+encrypt);
        System.out.println("解密结果："+decrypt(password, encrypt));
    }
}

输出日志为：

加密结果：269dd938eed81955f98e026f3df40fa5
解密结果：xiaoyuge

2. JS 解密

1. 从CryptoJs网站下载最新的源码包

   request

   https://github.com/brix/crypto-js/releases/tag/4.1.1

2. 编写解密代码

   const encrypt = "269dd938eed81955f98e026f3df40fa5";
   const password = "secret_key";
   const keyHex = CryptoJs.enc.Utf8.parse(password);
   const decrypted = CryptoJS.DES.decrypt({
       ciphertext: CryptoJS.enc.Hex.parse(encrypt)
   },keyHex,{
       mode: CryptoJS.mode.ECB, 
       padding: CryptoJS.pad.Pkcs7
   }).toString (CryptoJS.enc.Utf8);