AES加密解密

转自：https://blog.csdn.net/qq_33317238/article/details/122108861?utm_medium=distribute.pc_aggpage_search_result.none-task-blog-2~aggregatepage~first_rank_ecpm_v1~rank_v31_ecpm-1-122108861.pc_agg_new_rank&utm_term=springboot+%E5%BC%95%E5%85%A5aes%E5%8A%A0%E5%AF%86&spm=1000.2123.3001.4430

转自：https://blog.csdn.net/qq_28205153/article/details/55798628

转自: https://www.zhihu.com/question/20874499

转自：https://blog.csdn.net/l18848956739/article/details/83184243

package com.zhhs.app.utils;

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

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;

public class AesUtil {
      /**
     * 密钥 (需要前端和后端保持一致)十六位作为密钥
     */
    private static final String KEY = "SwScqcJqO1NIKPwB";
    /**
     * 密钥偏移量 (需要前端和后端保持一致)十六位作为密钥偏移量
     */
    private static final String IV = "0FVo7C4JQrU8wuR4";

    /**
     * base 64 decode
     *
     * @param base64Code 待解码的base 64 code
     * @return 解码后的byte[]
     */
    public static byte[] base64Decode(String base64Code) {
        return StringUtils.isEmpty(base64Code) ? null : Base64.decodeBase64(base64Code.getBytes());
    }

    /**
     * AES解密
     *
     * @param encryptBytes 待解密的byte[]
     * @return 解密后的String
     * @throws Exception
     */
    public static String aesDecryptByBytes(byte[] encryptBytes) throws Exception {
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");

        byte[] temp = IV.getBytes(StandardCharsets.US_ASCII);
        IvParameterSpec iv = new IvParameterSpec(temp);

        cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(KEY.getBytes(StandardCharsets.US_ASCII), "AES"), iv);
        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
     * @return 解密后的string
     * @throws Exception
     */
    public static String aesDecrypt(String encryptStr) throws Exception {
        return StringUtils.isEmpty(encryptStr) ? null : aesDecryptByBytes(base64Decode(encryptStr));
    }

    //加密
    @SuppressWarnings("unused")
    public static String aesEncrypt(String str) {
        try {
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            IvParameterSpec iv = new IvParameterSpec(IV.getBytes(StandardCharsets.US_ASCII));
            cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(KEY.getBytes(StandardCharsets.US_ASCII), "AES"), iv);
            byte[] encryptBytes = cipher.doFinal(str.getBytes(StandardCharsets.UTF_8));

            return new String(Base64.encodeBase64(encryptBytes), StandardCharsets.US_ASCII);
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
    }

    /**
     * 生成一个可选长度的随机数列
     *
     * @param
     */
    public static String getRandomCode(int length) {
        String[] arr = new String[]{"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G",
                "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X",
                "Y", "Z", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o",
                "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"};
        String str = "";
        for (int i = 0; i < length; i++) {
            int r = (int) (Math.random() * 61);
            str += arr[r];
        }
        return str;
    }
}