AES加密解密代码

Posted 2021-03-18 fengfeng21

package com.huizhuyun.jeemis.api.openAPI.service;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import java.util.Base64;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

import static java.util.Base64.*;

/**
 * Aes加密解密
 */
public class AesMethodOpenService {
    private static final Logger LOGGER = LoggerFactory.getLogger(AesMethodOpenService.class);
    private static final String ENCODING = "GBK";
    private static final String KEY_ALGORITHM = "AES";
    private static final Base64.Decoder decoder = Base64.getDecoder();
    private static final Base64.Encoder encoder = Base64.getEncoder();
    /**
     * 加解密算法/工作模式/填充方式
     */
    private  static final String DEFAUIT_CIPHER_ALGORITHM = "AES/CBC/PKCS5Padding";
    /**
     * 填充向量
     */
    private static final String FILL_VECTOR = "1234560405060708";


    /**
     * 加密
     *
     * @param sSrc  加密前的字符串
     * @param sKey 加密KEY
     * @return
     * @throws Exception
     * @author yinning
     */
    public static String encrypt (String sSrc, String sKey) throws  Exception{
        if (sKey == null) {
            System.out.print("Key为空null");
            return null;
        }
        // 判断Key是否为16位
        if (sKey.length() != 16) {
            System.out.print("Key长度不是16位");
            return null;
        }
        byte[] raw = sKey.getBytes("utf-8");
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        Cipher cipher = Cipher.getInstance(DEFAUIT_CIPHER_ALGORITHM);//"算法/模式/补码方式"
        IvParameterSpec iv = new IvParameterSpec(sKey.getBytes());//使用CBC模式，需要一个向量iv，可增加加密算法的强度
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
        byte[] encrypted = cipher.doFinal(sSrc.getBytes());
        String encodedText = encoder.encodeToString(encrypted);
        return encodedText;//此处使用BASE64做转码功能，同时能起到2次加密的作用。

    }

    /**
     * 解密
     *
     * @param sSrc  解密前的字符串
     * @param sKey 解密KEY
     * @return
     * @throws Exception
     * @author yinning
     */
    public static String decrypt(String sSrc, String sKey) {
        try {
            // 判断Key是否正确
            if (sKey == null) {
                System.out.print("Key为空null");
                return null;
            }
            // 判断Key是否为16位
            if (sKey.length() != 16) {
                System.out.print("Key长度不是16位");
                return null;
            }
            byte[] raw = sKey.getBytes("utf-8");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance(DEFAUIT_CIPHER_ALGORITHM);
            IvParameterSpec iv = new IvParameterSpec(sKey.getBytes());
            cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
            byte[] encrypted1 = decoder.decode(sSrc);//先用base64解密
            try {
                byte[] original = cipher.doFinal(encrypted1);
                String originalString = new String(original);
                return originalString;
            } catch (Exception e) {
                System.out.println(e.toString());
                return null;
            }
        } catch (Exception ex) {
            System.out.println(ex.toString());
            return null;
        }
    }

    public static void main(String[] args) throws Exception {

        String cKey = "9230967890982316";
        // 需要加密的字串
        String cSrc = "211421188811111212";
        System.out.println(cSrc);
        // 加密
        long lStart = System.currentTimeMillis();
        String enString = encrypt(cSrc, cKey);
        System.out.println("加密后的字串是：" + enString);

        long lUseTime = System.currentTimeMillis() - lStart;
        System.out.println("加密耗时：" + lUseTime + "毫秒");
        lStart = System.currentTimeMillis();
            String DeString = decrypt(enString, cKey);
        System.out.println("解密后的字串是：" + DeString);
        lUseTime = System.currentTimeMillis() - lStart;
        System.out.println("解密耗时：" + lUseTime + "毫秒");

    }
}