技術標籤：演算法

使用Hutool開源工具類實現加密加密

AES加密解密

String content = "test中文";

//隨機生成金鑰
byte[] key = SecureUtil.generateKey(SymmetricAlgorithm.AES.getValue()).getEncoded();

//構建
AES aes = SecureUtil.aes(key);

//加密
byte[] encrypt = aes.encrypt(content);
//解密
byte[] decrypt = aes.decrypt(encrypt);

//加密為16進製表示
 

String encryptHex = des.encryptHex(content);
//解密為原字串
String decryptStr = des.decryptStr(encryptHex);

DES加密解密

DES的使用方式與AES基本一致

String content = "test中文";

//隨機生成金鑰
byte[] key = SecureUtil.generateKey(SymmetricAlgorithm.DES.getValue()).getEncoded();

//構建
DES des = SecureUtil.des(key);

//加密解密
byte
 
[] encrypt = des.encrypt(content);
byte[] decrypt = des.decrypt(encrypt);

//加密為16進位制，解密為原字串
String encryptHex = des.encryptHex(content);
String decryptStr = des.decryptStr(encryptHex);

AES加密解密工具類

import lombok.extern.slf4j.Slf4j;

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

/**
 * 加密解密工具類
 *
 * @author zhaoyang10
 * @date 2020/12/15
 */
 

@Slf4j
public class AesUtil {

    private static final String KEY_AES = "AES";

    private static final int KEY_LENGTH = 16;

    /**
     * 加密
     */
    public static String encrypt(String src, String key) {
        try {
            if (key == null || key.length() != KEY_LENGTH) {
                throw new IllegalArgumentException("金鑰長度必須是16位");
            }
            byte[] raw = key.getBytes();
            SecretKeySpec skySpec = new SecretKeySpec(raw, KEY_AES);
            Cipher cipher = Cipher.getInstance(KEY_AES);
            cipher.init(Cipher.ENCRYPT_MODE, skySpec);
            byte[] encrypted = cipher.doFinal(src.getBytes());
            return byte2hex(encrypted);
        } catch (Exception e) {
            log.error("AES加密方法出錯", e);
        }
        return null;
    }

    public static String decrypt(String src, String key) {
        try {
            if (key == null || key.length() != KEY_LENGTH) {
                throw new IllegalArgumentException("金鑰長度必須是16位");
            }
            byte[] raw = key.getBytes();
            SecretKeySpec skySpec = new SecretKeySpec(raw, KEY_AES);
            Cipher cipher = Cipher.getInstance(KEY_AES);
            cipher.init(Cipher.DECRYPT_MODE, skySpec);
            byte[] encrypted1 = hex2byte(src);
            byte[] original = cipher.doFinal(encrypted1);
            return new String(original);
        } catch (Exception e) {
            log.error("AES解密出錯", e);
        }
        return null;
    }

    public static byte[] hex2byte(String hex) {
        if (hex == null) {
            return new byte[0];
        }
        int l = hex.length();
        int n = 2;
        if (l % n == 1) {
            return new byte[0];
        }
        byte[] b = new byte[l / 2];
        for (int i = 0; i != l / n; i++) {
            b[i] = (byte) Integer.parseInt(hex.substring(i * 2, i * 2 + 2),
                    16);
        }
        return b;
    }

    public static String byte2hex(byte[] b) {
        StringBuilder hs = new StringBuilder();
        String tmp;
        for (byte value : b) {
            tmp = (Integer.toHexString(value & 0XFF));
            if (tmp.length() == 1) {
                hs.append("0").append(tmp);
            } else {
                hs.append(tmp);
            }
        }
        return hs.toString().toUpperCase();
    }

    public static void main(String[] args) {
        String content = "http://s3zz.ad.weibo.com/license/1231xxqrq3rr44q.jpg#13121121231231";
        log.info("原內容 = {}", content);
        String encrypt = AesUtil.encrypt(content, "aWXoyC4UNb111111");
        log.info("加密後 = {}", encrypt);
        String decrypt = AesUtil.decrypt(encrypt, "aWXoyC4UNb111111");
        log.info("解密後 = {}", decrypt);
    }

}