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 2、什么是 AES-GCM加密算法：https://blog.csdn.net/T0mato_/article/details/53160772
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