适用于前后端的des加密算

2019-07-17

字数统计: 4.9k字 | 阅读时长≈ 29分

我们在项目开发过程当中，难免会有一些比较敏感的信息会进行一些交互，这个时候我们就要考虑进行信息加密的问题，首先，有些可能会想到，我们在进行项目开发使用https就行了，这种其实也是不安全的做法，因为接口返回的数据依然是没有加密的，只是前端传入后端进行了加密，在进行了一些选择之后，这里还是使用了des加密算法.

java代码:
注意:这里需要依赖lang3包


import java.math.BigInteger;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.lang3.StringUtils;

import sun.misc.BASE64Decoder;

/**
 * AES的加密和解密
 * @author chengliang
 */
public class DesUtils {
    //密钥 (需要前端和后端保持一致)
    private static final String KEY = "十六位key，前端需要保持一致，不能是中文";
    //算法
    private static final String ALGORITHMSTR = "AES/ECB/PKCS5Padding";

    /**
     * aes解密
     * @param encrypt   内容
     * @return
     * @throws Exception
     */
    public static String aesDecrypt(String encrypt) {
        try {
            return aesDecrypt(encrypt, KEY);
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
    }

    /**
     * aes加密
     * @param content
     * @return
     * @throws Exception
     */
    public static String aesEncrypt(String content) {
        try {
            return aesEncrypt(content, KEY);
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
    }

    /**
     * 将byte[]转为各种进制的字符串
     * @param bytes byte[]
     * @param radix 可以转换进制的范围，从Character.MIN_RADIX到Character.MAX_RADIX，超出范围后变为10进制
     * @return 转换后的字符串
     */
    public static String binary(byte[] bytes, int radix){
        return new BigInteger(1, bytes).toString(radix);
    }

    /**
     * base 64 encode
     * @param bytes 待编码的byte[]
     * @return 编码后的base 64 code
     */
    public static String base64Encode(byte[] bytes){
        return Base64.encodeBase64String(bytes);
    }

    /**
     * base 64 decode
     * @param base64Code 待解码的base 64 code
     * @return 解码后的byte[]
     * @throws Exception
     */
    public static byte[] base64Decode(String base64Code) throws Exception{
        return StringUtils.isEmpty(base64Code) ? null : new BASE64Decoder().decodeBuffer(base64Code);
    }


    /**
     * AES加密
     * @param content 待加密的内容
     * @param encryptKey 加密密钥
     * @return 加密后的byte[]
     * @throws Exception
     */
    public static byte[] aesEncryptToBytes(String content, String encryptKey) throws Exception {
        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        kgen.init(128);
        Cipher cipher = Cipher.getInstance(ALGORITHMSTR);
        cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(encryptKey.getBytes(), "AES"));

        return cipher.doFinal(content.getBytes("utf-8"));
    }


    /**
     * AES加密为base 64 code
     * @param content 待加密的内容
     * @param encryptKey 加密密钥
     * @return 加密后的base 64 code
     * @throws Exception
     */
    public static String aesEncrypt(String content, String encryptKey) throws Exception {
        return base64Encode(aesEncryptToBytes(content, encryptKey));
    }

    /**
     * AES解密
     * @param encryptBytes 待解密的byte[]
     * @param decryptKey 解密密钥
     * @return 解密后的String
     * @throws Exception
     */
    public static String aesDecryptByBytes(byte[] encryptBytes, String decryptKey) throws Exception {
        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        kgen.init(128);

        Cipher cipher = Cipher.getInstance(ALGORITHMSTR);
        cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(decryptKey.getBytes(), "AES"));
        byte[] decryptBytes = cipher.doFinal(encryptBytes);
        return new String(decryptBytes);
    }


    /**
     * 将base 64 code AES解密
     * @param encryptStr 待解密的base 64 code
     * @param decryptKey 解密密钥
     * @return 解密后的string
     * @throws Exception
     */
    public static String aesDecrypt(String encryptStr, String decryptKey) throws Exception {
        return StringUtils.isEmpty(encryptStr) ? null : aesDecryptByBytes(base64Decode(encryptStr), decryptKey);
    }

    /**
     * 测试
     */
    public static void main(String[] args) throws Exception {
        String content = "123";
        System.out.println("加密前：" + content);
        System.out.println("加密密钥和解密密钥：" + KEY);
        String encrypt = aesEncrypt(content, KEY);
        System.out.println("加密后：" + encrypt);
        String decrypt = aesDecrypt(encrypt, KEY);
        System.out.println("解密后：" + decrypt);
    }
}

js代码:

/**
 * 加密（需要先加载lib/aes/aes.min.js文件）
 * @param word
 * @returns {*}
 */
function encrypt(word){
    var key = CryptoJS.enc.Utf8.parse("abcdefgabcdefg12");
    var srcs = CryptoJS.enc.Utf8.parse(word);
    var encrypted = CryptoJS.AES.encrypt(srcs, key, {mode:CryptoJS.mode.ECB,padding: CryptoJS.pad.Pkcs7});
    return encrypted.toString();
}

/**
 * 解密
 * @param word
 * @returns {*}
 */
function decrypt(word){
    var key = CryptoJS.enc.Utf8.parse("abcdefgabcdefg12");
    var decrypt = CryptoJS.AES.decrypt(word, key, {mode:CryptoJS.mode.ECB,padding: CryptoJS.pad.Pkcs7});
    return CryptoJS.enc.Utf8.stringify(decrypt).toString();
}

需要依赖aes.js文件：

以下是压缩后的aes.js文件

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到这里，加密工作就完成了，我们要根据自己本身的业务需求来进行加密工具的选择。

本文作者： Cayden
本文链接： http://example.com/2019/07/17/适用于前后端的des加密算/
版权声明： 本博客所有文章除特别声明外，均采用 MIT 许可协议。转载请注明出处！