java aes 工具类
java aes 工具类
import org.apache.commons.codec.binary.Base64;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
/**
*
* @author kyle.zeng
* @website https://www.seaxiang.com
* @version 1.0
* @date 2018/4/16 16:26
* @since 1.0
*/
public class AesUtil {
private static final String KEY_ALGORITHM = "AES";
private static final String DEFAULT_CIPHER_ALGORITHM = "AES/ECB/PKCS5Padding";
/**
* AES加密
*
* @param passwd
* 加密的密钥
* @param content
* 需要加密的字符串
* @return 返回Base64转码后的加密数据
* @throws Exception
*/
public static String encrypt(String passwd, String content) throws Exception {
// 创建密码器
Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);
byte[] byteContent = content.getBytes("utf-8");
// 初始化为加密模式的密码器
cipher.init(Cipher.ENCRYPT_MODE, getSecretKey(passwd));
// 加密
byte[] result = cipher.doFinal(byteContent);
//通过Base64转码返回
return Base64.encodeBase64String(result);
}
/**
* AES解密
*
* @param passwd
* 加密的密钥
* @param encrypted
* 已加密的密文
* @return 返回解密后的数据
* @throws Exception
*/
public static String decrypt(String passwd, String encrypted) throws Exception {
//实例化
Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);
//使用密钥初始化，设置为解密模式
cipher.init(Cipher.DECRYPT_MODE, getSecretKey(passwd));
//执行操作
byte[] result = cipher.doFinal(Base64.decodeBase64(encrypted));
return new String(result, "utf-8");
}
/**
* 生成加密秘钥
*
* @return
*/
private static SecretKeySpec getSecretKey(final String password) throws NoSuchAlgorithmException {
//返回生成指定算法密钥生成器的 KeyGenerator 对象
KeyGenerator kg = KeyGenerator.getInstance(KEY_ALGORITHM);
// javax.crypto.BadPaddingException: Given final block not properly padded解决方案
// https://www.cnblogs.com/zempty/p/4318902.html - 用此法解决的
// https://www.cnblogs.com/digdeep/p/5580244.html - 留作参考吧
SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
random.setSeed(password.getBytes());
//AES 要求密钥长度为 128
kg.init(128, random);
//生成一个密钥
SecretKey secretKey = kg.generateKey();
// 转换为AES专用密钥
return new SecretKeySpec(secretKey.getEncoded(), KEY_ALGORITHM);
}
}
0
赞
热门推荐
-
2、 - 优质文章
-
3、 gate.io
-
6、 golang
-
7、 openharmony