AES对称加解密工具类（AES/GCM/PKCS5Padding）

悠悠 2021-12-04 09:55 966阅读 0赞

import java.security.InvalidAlgorithmParameterException;
    import java.security.InvalidKeyException;
    import java.security.NoSuchAlgorithmException;
    import java.security.SecureRandom;
    
    import javax.crypto.BadPaddingException;
    import javax.crypto.Cipher;
    import javax.crypto.IllegalBlockSizeException;
    import javax.crypto.KeyGenerator;
    import javax.crypto.NoSuchPaddingException;
    import javax.crypto.SecretKey;
    import javax.crypto.spec.GCMParameterSpec;
    import javax.crypto.spec.SecretKeySpec;
    
    import org.apache.commons.codec.binary.Base64;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    
    /**
     * AES对称加密工具类
     * 
     * @author 单红宇
     * @date 2019年7月18日
     *
     */
    public class AESUtils {
    
    	private static final Logger logger = LoggerFactory.getLogger(AESUtils.class);
    
    	private static final String KEY_ALGORITHM = "AES";
    	private static final String DEFAULT_CIPHER_ALGORITHM = "AES/GCM/PKCS5Padding";;// 默认的加密算法
    
    	/**
    	 * AES 加密操作
    	 *
    	 * @param content     待加密内容
    	 * @param encryptPass 加密密码
    	 * @return 返回Base64转码后的加密数据
    	 */
    	public static String encrypt(String content, String encryptPass) {
    		try {
    			Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);
    			cipher.init(Cipher.ENCRYPT_MODE, getSecretKey(encryptPass));
    			byte[] iv = cipher.getIV();
    			assert iv.length == 12;
    			byte[] encryptData = cipher.doFinal(content.getBytes());
    			assert encryptData.length == content.getBytes().length + 16;
    			byte[] message = new byte[12 + content.getBytes().length + 16];
    			System.arraycopy(iv, 0, message, 0, 12);
    			System.arraycopy(encryptData, 0, message, 12, encryptData.length);
    			return Base64.encodeBase64String(message);
    		} catch (InvalidKeyException | NoSuchAlgorithmException | NoSuchPaddingException | IllegalBlockSizeException
    				| BadPaddingException e) {
    			logger.error(e.getMessage(), e);
    		}
    		return null;
    	}
    
    	/**
    	 * AES 解密操作
    	 *
    	 * @param base64Content
    	 * @param encryptPass
    	 * @return
    	 */
    	public static String decrypt(String base64Content, String encryptPass) {
    		byte[] content = Base64.decodeBase64(base64Content);
    		if (content.length < 12 + 16)
    			throw new IllegalArgumentException();
    		GCMParameterSpec params = new GCMParameterSpec(128, content, 0, 12);
    		try {
    			Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);
    			cipher.init(Cipher.DECRYPT_MODE, getSecretKey(encryptPass), params);
    			byte[] decryptData = cipher.doFinal(content, 12, content.length - 12);
    			return new String(decryptData);
    		} catch (InvalidKeyException | NoSuchAlgorithmException | NoSuchPaddingException
    				| InvalidAlgorithmParameterException | IllegalBlockSizeException | BadPaddingException e) {
    			logger.error(e.getMessage(), e);
    		}
    		return null;
    	}
    
    	/**
    	 * 生成加密秘钥
    	 *
    	 * @return
    	 * @throws NoSuchAlgorithmException
    	 */
    	private static SecretKeySpec getSecretKey(String encryptPass) throws NoSuchAlgorithmException {
    		KeyGenerator kg = KeyGenerator.getInstance(KEY_ALGORITHM);
    		// 初始化密钥生成器，AES要求密钥长度为128位、192位、256位
    		kg.init(128, new SecureRandom(encryptPass.getBytes()));
    		SecretKey secretKey = kg.generateKey();
    		return new SecretKeySpec(secretKey.getEncoded(), KEY_ALGORITHM);// 转换为AES专用密钥
    	}
    
    	public static void main(String[] args) {
    		String s = "65c86251eeeed0638be6e737a136dd3060097c4094d6f2d7dc56824670519022&EBD0B5D2-F4E7-453A-9E16-01AE8F6E2977&Mozilla/5.0 (iPhone; CPU iPhone OS 12_3_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148";
    		String pass = "EBD0B5D2-F4E7-453A-9E16-01AE8F6E2977";
    		String encoded = encrypt(s, pass);
    		logger.info("加密之前：{}", s);
    		logger.info("加密结果：{}", encoded);
    		logger.info("解密结果：{}", decrypt(encoded, pass));
    	}
    }

**注意：不推荐使用 ECB 模式，以太坊Whisper协议中，默认的对称加密使用的是`AES-GCM`加密算法。**  
**参考文章**  
1、AES的介绍：[https://blog.csdn.net/qq\_28205153/article/details/55798628][https_blog.csdn.net_qq_28205153_article_details_55798628]  
2、什么是 AES-GCM加密算法：[https://blog.csdn.net/T0mato\_/article/details/53160772][https_blog.csdn.net_T0mato_article_details_53160772]

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[https_blog.csdn.net_qq_28205153_article_details_55798628]: https://blog.csdn.net/qq_28205153/article/details/55798628
[https_blog.csdn.net_T0mato_article_details_53160772]: https://blog.csdn.net/T0mato_/article/details/53160772