对称加密-DES加密解密

<script src="https://cdn.bootcss.com/crypto-js/3.1.9-1/crypto-js.min.js"></script>

//DES加密
function encryptByDES(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.ciphertext.toString();
}
//DES加密
function decryptByDES(ciphertext, key){
    var keyHex = CryptoJS.enc.Utf8.parse(key);
    var decrypted = CryptoJS.DES.decrypt({
        ciphertext: CryptoJS.enc.Hex.parse(ciphertext)
    }, keyHex, {
        mode: CryptoJS.mode.ECB,
        padding: CryptoJS.pad.Pkcs7
    });
    var result_value = decrypted.toString(CryptoJS.enc.Utf8);
    return result_value;
}

var message = ‘111111‘;//需要加密的数据
var key = ‘12345678‘;//加密key
//加密
desMessage = encryptByDES(message, key);
console.log(desMessage);
//解密
message = decryptByDES(desMessage,key)
console.log(message);

package com.qt.xxx.util;

import java.io.ByteArrayOutputStream;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.Signature;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import com.alibaba.fastjson.JSONObject;

//加密解密工具
public class EncryptUtil { 
    /**
     * DES加密算法
       * 这个加密算法是对称的加密算法这个加密算法，在本系统中的应用，主要是因为该加密算法加密后密文都是字符串和数字的，没有其他字符。这样的密文可以应用在url地址上，
       * 不用担心被URL 地址上传递的数字被转义
     * @author QT
     *
     */
    /** 加密算法,可用 DES,DESede,Blowfish. */
    private final static String ALGORITHM = "DES";

    //------------------------DES----start---------------------------------
    /**
     * DES解密算法
     * @param data
     * @param cryptKey  密钥 要是偶数
     * @return
     * @throws Exception
     */
    public static String decryptByDES(String data, String cryptKey){
        try {
            return new String(decrypt(hex2byte(data.getBytes()),
                    cryptKey.getBytes()));
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
    }

    /**
     * DES加密算法
     * @param data
     * @param cryptKey
     * @return
     * @throws Exception
     */
    public static String encryptByDES(String data, String cryptKey){
        try {
            return byte2hex(encrypt(data.getBytes(), cryptKey.getBytes()));
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
    }

    private static byte[] encrypt(byte[] data, byte[] key) throws Exception {
        // DES算法要求有一个可信任的随机数源
        SecureRandom sr = new SecureRandom();
        // 从原始密匙数据创建DESKeySpec对象
        DESKeySpec dks = new DESKeySpec(key);
        // 创建一个密匙工厂，然后用它把DESKeySpec转换成
        // 一个SecretKey对象
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);
        SecretKey securekey = keyFactory.generateSecret(dks);
        // Cipher对象实际完成加密操作
        Cipher cipher = Cipher.getInstance(ALGORITHM);
        // 用密匙初始化Cipher对象
        cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);
        // 现在，获取数据并加密
        // 正式执行加密操作
        return cipher.doFinal(data);
    }

    private static byte[] decrypt(byte[] data, byte[] key) throws Exception {
        // DES算法要求有一个可信任的随机数源
        SecureRandom sr = new SecureRandom();
        // 从原始密匙数据创建一个DESKeySpec对象
        DESKeySpec dks = new DESKeySpec(key);
        // 创建一个密匙工厂，然后用它把DESKeySpec对象转换成
        // 一个SecretKey对象
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);
        SecretKey securekey = keyFactory.generateSecret(dks);
        // Cipher对象实际完成解密操作
        Cipher cipher = Cipher.getInstance(ALGORITHM);
        // 用密匙初始化Cipher对象
        cipher.init(Cipher.DECRYPT_MODE, securekey, sr);
        // 现在，获取数据并解密
        // 正式执行解密操作
        return cipher.doFinal(data);
    }

    private static byte[] hex2byte(byte[] b) {
        if ((b.length % 2) != 0)
            throw new IllegalArgumentException("长度不是偶数");
        byte[] b2 = new byte[b.length / 2];
        for (int n = 0; n < b.length; n += 2) {
            String item = new String(b, n, 2);
            b2[n / 2] = (byte) Integer.parseInt(item, 16);
        }
        return b2;
    }

    private static String byte2hex(byte[] b) {
        String hs = "";
        String stmp = "";
        for (int n = 0; n < b.length; n++) {
            stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
            if (stmp.length() == 1)
                hs = hs + "0" + stmp;
            else
                hs = hs + stmp;
        }
        return hs.toUpperCase();
    }
    
  //------------------------DES----end-----------------------------------
}